Hi, (plain text repost)
This is my first post to ffmpeg, please advise if I misplaced this issue.
I have been using ffmpeg for many years and now have an issue with the latest 
version:
ffmpeg-20180731-481741e-win64-static

When transcoding a VOB, ntsc-dvd, I get "buffer underflow" errors.  This is 
especially true when using a delayed start time.  I originally discovered the 
problem on my own Linux build and reproduced it using pre built executables 
from:
 //ffmpeg.zeranoe.com/builds/win64/static/

I managed to isolate the problem between two zeranoe builds:
ffmpeg-20180329-e5819fa-win64-static - seems to work correctly
ffmpeg-20180330-cdd6a52-win64-static - generates "buffer underflow"

The resulting output file from the problematic builds also generate errors when 
processed by dvdauthor.

Below is the console output from the error'ed case case followed by the good 
case between two versions produced with a day of each other.  I will continue 
to study the problem and post more information as I collect it and upon 
request.  Hopefully this can get resolved.  Do I need to change some arguments, 
is this a new bug or is what I am trying to do no longer supported??
(Note:  I have not yet discovered where to put my sample files, I will continue 
looking)
Thanks a lot!

This is the latest version:
c:\Developer>cd ffmpeg-20180731-481741e-win64-static\bin
c:\Developer\ffmpeg-20180731-481741e-win64-static\bin>ffmpeg.exe -i 
../../20180726_150335-phasebtop1.vob -ss 10 -target
ntsc-dvd -flags +cgop+ilme+ildct -alternate_scan 1 -top 1 -g 15 -sc_threshold 
1000000000 -y bob.VOB -v debug
ffmpeg version N-91548-g481741ece0 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7.3.1 (GCC) 20180722
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib 
--enable-fontconfig --enable-gnutls --enabl
e-iconv --enable-libass --enable-libbluray --enable-libfreetype 
--enable-libmp3lame --enable-libopencore-amrnb --enable-
libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine 
--enable-libsnappy --enable-libsoxr --enable-l
ibtheora --enable-libtwolame --enable-libvpx --enable-libwavpack 
--enable-libwebp --enable-libx264 --enable-libx265 --en
able-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp 
--enable-libvidstab --enable-libvorbis --enable-l
ibvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid 
--enable-libaom --enable-libmfx --enable-amf --enabl
e-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec 
--enable-dxva2 --enable-avisynth
  libavutil      56. 18.102 / 56. 18.102
  libavcodec     58. 22.100 / 58. 22.100
  libavformat    58. 17.101 / 58. 17.101
  libavdevice    58.  4.101 / 58.  4.101
  libavfilter     7. 26.100 /  7. 26.100
  libswscale      5.  2.100 /  5.  2.100
  libswresample   3.  2.100 /  3.  2.100
  libpostproc    55.  2.100 / 55.  2.100
Splitting the commandline.
Reading option '-i' ... matched as input url with argument 
'../../20180726_150335-phasebtop1.vob'.
Reading option '-ss' ... matched as option 'ss' (set the start time offset) 
with argument '10'.
Reading option '-target' ... matched as option 'target' (specify target file 
type ("vcd", "svcd", "dvd", "dv" or "dv50"
with optional prefixes "pal-", "ntsc-" or "film-")) with argument 'ntsc-dvd'.
Reading option '-flags' ... matched as AVOption 'flags' with argument 
'+cgop+ilme+ildct'.
Reading option '-alternate_scan' ... matched as AVOption 'alternate_scan' with 
argument '1'.
Reading option '-top' ... matched as option 'top' (top=1/bottom=0/auto=-1 field 
first) with argument '1'.
Reading option '-g' ... matched as AVOption 'g' with argument '15'.
Reading option '-sc_threshold' ... matched as AVOption 'sc_threshold' with 
argument '1000000000'.
Reading option '-y' ... matched as option 'y' (overwrite output files) with 
argument '1'.
Reading option 'bob.VOB' ... matched as output url.
Reading option '-v' ... matched as option 'v' (set logging level) with argument 
'debug'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option y (overwrite output files) with argument 1.
Applying option v (set logging level) with argument debug.
Successfully parsed a group of options.
Parsing a group of options: input url ../../20180726_150335-phasebtop1.vob.
Successfully parsed a group of options.
Opening an input file: ../../20180726_150335-phasebtop1.vob.
[NULL @ 0000000000613ec0] Opening '../../20180726_150335-phasebtop1.vob' for 
reading
[file @ 00000000006145c0] Setting default whitelist 'file,crypto'
[mpeg @ 0000000000613ec0] Format mpeg probed with size=2048 and score=26
[mpeg @ 0000000000613ec0] Before avformat_find_stream_info() pos: 0 bytes 
read:32768 seeks:0 nb_streams:0
[mpeg @ 0000000000613ec0] probing stream 1 pp:2500
[mpeg @ 0000000000613ec0] Probe with size=2011, packets=1 detected mpegvideo 
with score=25
[mpeg @ 0000000000613ec0] probed stream 1
[mpeg2video @ 0000000000614b80] Format yuv420p chosen by get_format().
[mpeg @ 0000000000613ec0] max_analyze_duration 5000000 reached at 5005000 
microseconds st:1
[mpeg @ 0000000000613ec0] start time for stream 0 is not set in 
estimate_timings_from_pts
[mpeg @ 0000000000613ec0] After avformat_find_stream_info() pos: 0 bytes 
read:3559568 seeks:2 frames:299
Input #0, mpeg, from '../../20180726_150335-phasebtop1.vob':
  Duration: 00:01:30.93, start: 0.528033, bitrate: 5065 kb/s
    Stream #0:0[0x1bf], 0, 1/90000: Data: dvd_nav_packet, 0/1
    Stream #0:1[0x1e0], 152, 1/90000: Video: mpeg2video (Main), 1 reference 
frame, yuv420p(tv, top first, left), 720x480
 [SAR 8:9 DAR 4:3], 0/1, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Stream #0:2[0x80], 147, 1/90000: Audio: ac3, 48000 Hz, stereo, fltp, 448 
kb/s
Successfully opened the file.
Parsing a group of options: output url bob.VOB.
Applying option ss (set the start time offset) with argument 10.
Applying option target (specify target file type ("vcd", "svcd", "dvd", "dv" or 
"dv50" with optional prefixes "pal-", "n
tsc-" or "film-")) with argument ntsc-dvd.
Applying option top (top=1/bottom=0/auto=-1 field first) with argument 1.
Successfully parsed a group of options.
Opening an output file: bob.VOB.
[file @ 00000000028c7740] Setting default whitelist 'file,crypto'
Successfully opened the file.
detected 8 logical cores
Stream mapping:
  Stream #0:1 -> #0:0 (mpeg2video (native) -> mpeg2video (native))
  Stream #0:2 -> #0:1 (ac3 (native) -> ac3 (native))
Press [q] to stop, [?] for help
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[graph_1_in_0_2 @ 000000000061b540] Setting 'time_base' to value '1/48000'
[graph_1_in_0_2 @ 000000000061b540] Setting 'sample_rate' to value '48000'
[graph_1_in_0_2 @ 000000000061b540] Setting 'sample_fmt' to value 'fltp'
[graph_1_in_0_2 @ 000000000061b540] Setting 'channel_layout' to value '0x3'
[graph_1_in_0_2 @ 000000000061b540] tb:1/48000 samplefmt:fltp samplerate:48000 
chlayout:0x3
[format_out_0_1 @ 0000000002aac640] Setting 'sample_fmts' to value 'fltp'
[format_out_0_1 @ 0000000002aac640] Setting 'sample_rates' to value '48000'
[format_out_0_1 @ 0000000002aac640] Setting 'channel_layouts' to value 
'0x4|0x3|0x103|0x7|0x603|0x33|0x107|0x607|0x37|0x
c|0xb|0x10b|0xf|0x60b|0x3b|0x10f|0x60f|0x3f'
[AVFilterGraph @ 0000000002aa8e00] query_formats: 5 queried, 12 merged, 0 
already done, 0 delayed
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[mpeg2video @ 0000000002ae1e00] Format yuv420p chosen by get_format().
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[graph 0 input from stream 0:1 @ 0000000002ac9540] Setting 'video_size' to 
value '720x480'
[graph 0 input from stream 0:1 @ 0000000002ac9540] Setting 'pix_fmt' to value 
'0'
[graph 0 input from stream 0:1 @ 0000000002ac9540] Setting 'time_base' to value 
'1/90000'
[graph 0 input from stream 0:1 @ 0000000002ac9540] Setting 'pixel_aspect' to 
value '8/9'
[graph 0 input from stream 0:1 @ 0000000002ac9540] Setting 'sws_param' to value 
'flags=2'
[graph 0 input from stream 0:1 @ 0000000002ac9540] Setting 'frame_rate' to 
value '30000/1001'
[graph 0 input from stream 0:1 @ 0000000002ac9540] w:720 h:480 pixfmt:yuv420p 
tb:1/90000 fr:30000/1001 sar:8/9 sws_param
:flags=2
[scaler_out_0_0 @ 000000000284dc40] Setting 'w' to value '720'
[scaler_out_0_0 @ 000000000284dc40] Setting 'h' to value '480'
[scaler_out_0_0 @ 000000000284dc40] Setting 'flags' to value 'bicubic'
[scaler_out_0_0 @ 000000000284dc40] w:720 h:480 flags:'bicubic' interl:0
[format @ 0000000002aa8600] Setting 'pix_fmts' to value 'yuv420p'
[AVFilterGraph @ 0000000002aa8880] query_formats: 6 queried, 5 merged, 0 
already done, 0 delayed
[scaler_out_0_0 @ 000000000284dc40] w:720 h:480 fmt:yuv420p sar:8/9 -> w:720 
h:480 fmt:yuv420p sar:8/9 flags:0x4
[mpeg2video @ 000000000297b940] intra_quant_bias = 96 inter_quant_bias = 0
Output #0, dvd, to 'bob.VOB':
  Metadata:
    encoder         : Lavf58.17.101
    Stream #0:0, 0, 1/90000: Video: mpeg2video (Main), 1 reference frame, 
yuv420p(top first, left), 720x480 [SAR 8:9 DAR
 4:3], 0/1, q=2-31, 6000 kb/s, 29.97 fps, 90k tbn, 29.97 tbc
    Metadata:
      encoder         : Lavc58.22.100 mpeg2video
    Side data:
      cpb: bitrate max/min/avg: 9000000/0/6000000 buffer size: 1835008 
vbv_delay: -1
    Stream #0:1, 0, 1/90000: Audio: ac3, 48000 Hz, stereo, fltp, delay 256, 448 
kb/s
    Metadata:
      encoder         : Lavc58.22.100 ac3
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
    Last message repeated 295 times
cur_dts is invalid (this is harmless if it occurs once at the start per stream) 
0x
    Last message repeated 299 times
cur_dts is invalid (this is harmless if it occurs once at the start per stream) 
0x
    Last message repeated 289 times
cur_dts is invalid (this is harmless if it occurs once at the start per stream) 
0x
    Last message repeated 285 times
cur_dts is invalid (this is harmless if it occurs once at the start per stream) 
0x
    Last message repeated 54 times
[dvd @ 000000000297a600] First SCR: 0 First DTS: 45000
[dvd @ 000000000297a600] Non-monotonous DTS in output stream 0:1; previous: 
535200, current: 535200; changing to 535201.
 This may result in incorrect timestamps in the output file.
[dvd @ 000000000297a600] buffer underflow st=1 bufi=1175 
size=1792=6409.3kbits/s speed= 2.5x
[dvd @ 000000000297a600] Non-monotonous DTS in output stream 0:1; previous: 
1263840, current: 1263840; changing to 12638
41. This may result in incorrect timestamps in the output file.
[dvd @ 000000000297a600] Non-monotonous DTS in output stream 0:1; previous: 
1992480, current: 1992480; changing to 19924
81. This may result in incorrect timestamps in the output file.
[dvd @ 000000000297a600] buffer underflow st=1 bufi=1173 size=1792
[dvd @ 000000000297a600] Non-monotonous DTS in output stream 0:1; previous: 
4152480, current: 4152480; changing to 41524
81. This may result in incorrect timestamps in the output file.
[dvd @ 000000000297a600] Non-monotonous DTS in output stream 0:1; previous: 
4881120, current: 4881120; changing to 48811
21. This may result in incorrect timestamps in the output file.
[dvd @ 000000000297a600] buffer underflow st=1 bufi=1177 size=1792
[dvd @ 000000000297a600] Non-monotonous DTS in output stream 0:1; previous: 
5609760, current: 5609760; changing to 56097
61. This may result in incorrect timestamps in the output file.
[dvd @ 000000000297a600] buffer underflow st=1 bufi=1176 size=1792
[dvd @ 000000000297a600] Non-monotonous DTS in output stream 0:1; previous: 
6338400, current: 6338400; changing to 63384
01. This may result in incorrect timestamps in the output file.
[dvd @ 000000000297a600] Non-monotonous DTS in output stream 0:1; previous: 
7067040, current: 7067040; changing to 70670
41. This may result in incorrect timestamps in the output file.
[dvd @ 000000000297a600] buffer underflow st=1 bufi=1174 size=1792
[out_0_0 @ 000000000284db40] EOF on sink link out_0_0:default.
[out_0_1 @ 0000000002aac540] EOF on sink link out_0_1:default.
No more output streams to write to, finishing.
frame= 2425 fps=326 q=3.3 Lsize=   65038kB time=00:01:20.89 
bitrate=6586.6kbits/s speed=10.9x
video:59318kB audio:4424kB subtitle:0kB other streams:0kB global headers:0kB 
muxing overhead: 2.032480%
Input file #0 (../../20180726_150335-phasebtop1.vob):
  Input stream #0:0 (data): 0 packets read (0 bytes);
  Input stream #0:1 (video): 2725 packets read (51214402 bytes); 2725 frames 
decoded;
  Input stream #0:2 (audio): 2840 packets read (5089280 bytes); 2840 frames 
decoded (4362240 samples);
  Total: 5565 packets (56303682 bytes) demuxed
Output file #0 (bob.VOB):
  Output stream #0:0 (video): 2425 frames encoded; 2425 packets muxed (60742090 
bytes);
  Output stream #0:1 (audio): 2528 frames encoded (3882240 samples); 2528 
packets muxed (4530176 bytes);
  Total: 4953 packets (65272266 bytes) muxed
5565 frames successfully decoded, 0 decoding errors
[AVIOContext @ 00000000028a2440] Statistics: 0 seeks, 32357 writeouts
[AVIOContext @ 000000000061c840] Statistics: 61134992 bytes read, 2 seeks
c:\Developer\ffmpeg-20180731-481741e-win64-static\bin>------------------------------------------------------------------------

This is the first problematic version:
c:\Developer\ffmpeg-20180330-cdd6a52-win64-static\bin>ffmpeg.exe -i 
../../20180726_150335-phasebtop1.vob -ss 10 -target
ntsc-dvd -flags +cgop+ilme+ildct -alternate_scan 1 -top 1 -g 15 -sc_threshold 
1000000000 -y bob.VOB -v debug
ffmpeg version N-90535-gcdd6a525e4 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7.3.0 (GCC)
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib 
--enable-fontconfig --enable-gnutls --enabl
e-iconv --enable-libass --enable-libbluray --enable-libfreetype 
--enable-libmp3lame --enable-libopencore-amrnb --enable-
libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine 
--enable-libsnappy --enable-libsoxr --enable-l
ibtheora --enable-libtwolame --enable-libvpx --enable-libwavpack 
--enable-libwebp --enable-libx264 --enable-libx265 --en
able-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp 
--enable-libvidstab --enable-libvorbis --enable-l
ibvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid 
--enable-libaom --enable-libmfx --enable-amf --enabl
e-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec 
--enable-dxva2 --enable-avisynth
  libavutil      56. 12.100 / 56. 12.100
  libavcodec     58. 16.100 / 58. 16.100
  libavformat    58. 10.100 / 58. 10.100
  libavdevice    58.  2.100 / 58.  2.100
  libavfilter     7. 13.100 /  7. 13.100
  libswscale      5.  0.102 /  5.  0.102
  libswresample   3.  0.101 /  3.  0.101
  libpostproc    55.  0.100 / 55.  0.100
Splitting the commandline.
Reading option '-i' ... matched as input url with argument 
'../../20180726_150335-phasebtop1.vob'.
Reading option '-ss' ... matched as option 'ss' (set the start time offset) 
with argument '10'.
Reading option '-target' ... matched as option 'target' (specify target file 
type ("vcd", "svcd", "dvd", "dv" or "dv50"
with optional prefixes "pal-", "ntsc-" or "film-")) with argument 'ntsc-dvd'.
Reading option '-flags' ... matched as AVOption 'flags' with argument 
'+cgop+ilme+ildct'.
Reading option '-alternate_scan' ... matched as AVOption 'alternate_scan' with 
argument '1'.
Reading option '-top' ... matched as option 'top' (top=1/bottom=0/auto=-1 field 
first) with argument '1'.
Reading option '-g' ... matched as AVOption 'g' with argument '15'.
Reading option '-sc_threshold' ... matched as AVOption 'sc_threshold' with 
argument '1000000000'.
Reading option '-y' ... matched as option 'y' (overwrite output files) with 
argument '1'.
Reading option 'bob.VOB' ... matched as output url.
Reading option '-v' ... matched as option 'v' (set logging level) with argument 
'debug'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option y (overwrite output files) with argument 1.
Applying option v (set logging level) with argument debug.
Successfully parsed a group of options.
Parsing a group of options: input url ../../20180726_150335-phasebtop1.vob.
Successfully parsed a group of options.
Opening an input file: ../../20180726_150335-phasebtop1.vob.
[NULL @ 0000000000393ec0] Opening '../../20180726_150335-phasebtop1.vob' for 
reading
[file @ 00000000003945c0] Setting default whitelist 'file,crypto'
[mpeg @ 0000000000393ec0] Format mpeg probed with size=2048 and score=26
[mpeg @ 0000000000393ec0] Before avformat_find_stream_info() pos: 0 bytes 
read:32768 seeks:0 nb_streams:0
[mpeg @ 0000000000393ec0] probing stream 1 pp:2500
[mpeg @ 0000000000393ec0] Probe with size=2011, packets=1 detected mpegvideo 
with score=25
[mpeg @ 0000000000393ec0] probed stream 1
[mpeg2video @ 0000000000394b80] Format yuv420p chosen by get_format().
[mpeg @ 0000000000393ec0] max_analyze_duration 5000000 reached at 5005000 
microseconds st:1
[mpeg @ 0000000000393ec0] start time for stream 0 is not set in 
estimate_timings_from_pts
[mpeg @ 0000000000393ec0] After avformat_find_stream_info() pos: 0 bytes 
read:3559568 seeks:2 frames:299
Input #0, mpeg, from '../../20180726_150335-phasebtop1.vob':
  Duration: 00:01:30.93, start: 0.528033, bitrate: 5065 kb/s
    Stream #0:0[0x1bf], 0, 1/90000: Data: dvd_nav_packet, 0/1
    Stream #0:1[0x1e0], 152, 1/90000: Video: mpeg2video (Main), 1 reference 
frame, yuv420p(tv, top first, left), 720x480
 [SAR 8:9 DAR 4:3], 0/1, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Stream #0:2[0x80], 147, 1/90000: Audio: ac3, 48000 Hz, stereo, fltp, 448 
kb/s
Successfully opened the file.
Parsing a group of options: output url bob.VOB.
Applying option ss (set the start time offset) with argument 10.
Applying option target (specify target file type ("vcd", "svcd", "dvd", "dv" or 
"dv50" with optional prefixes "pal-", "n
tsc-" or "film-")) with argument ntsc-dvd.
Applying option top (top=1/bottom=0/auto=-1 field first) with argument 1.
Successfully parsed a group of options.
Opening an output file: bob.VOB.
[file @ 000000000039c080] Setting default whitelist 'file,crypto'
Successfully opened the file.
detected 8 logical cores
Stream mapping:
  Stream #0:1 -> #0:0 (mpeg2video (native) -> mpeg2video (native))
  Stream #0:2 -> #0:1 (ac3 (native) -> ac3 (native))
Press [q] to stop, [?] for help
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[graph_1_in_0_2 @ 0000000002a1d340] Setting 'time_base' to value '1/48000'
[graph_1_in_0_2 @ 0000000002a1d340] Setting 'sample_rate' to value '48000'
[graph_1_in_0_2 @ 0000000002a1d340] Setting 'sample_fmt' to value 'fltp'
[graph_1_in_0_2 @ 0000000002a1d340] Setting 'channel_layout' to value '0x3'
[graph_1_in_0_2 @ 0000000002a1d340] tb:1/48000 samplefmt:fltp samplerate:48000 
chlayout:0x3
[format_out_0_1 @ 00000000003e0bc0] Setting 'sample_fmts' to value 'fltp'
[format_out_0_1 @ 00000000003e0bc0] Setting 'sample_rates' to value '48000'
[format_out_0_1 @ 00000000003e0bc0] Setting 'channel_layouts' to value 
'0x4|0x3|0x103|0x7|0x603|0x33|0x107|0x607|0x37|0x
c|0xb|0x10b|0xf|0x60b|0x3b|0x10f|0x60f|0x3f'
[AVFilterGraph @ 0000000002a1e040] query_formats: 5 queried, 12 merged, 0 
already done, 0 delayed
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[mpeg2video @ 00000000003fdd40] Format yuv420p chosen by get_format().
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[graph 0 input from stream 0:1 @ 00000000026eb640] Setting 'video_size' to 
value '720x480'
[graph 0 input from stream 0:1 @ 00000000026eb640] Setting 'pix_fmt' to value 
'0'
[graph 0 input from stream 0:1 @ 00000000026eb640] Setting 'time_base' to value 
'1/90000'
[graph 0 input from stream 0:1 @ 00000000026eb640] Setting 'pixel_aspect' to 
value '8/9'
[graph 0 input from stream 0:1 @ 00000000026eb640] Setting 'sws_param' to value 
'flags=2'
[graph 0 input from stream 0:1 @ 00000000026eb640] Setting 'frame_rate' to 
value '30000/1001'
[graph 0 input from stream 0:1 @ 00000000026eb640] w:720 h:480 pixfmt:yuv420p 
tb:1/90000 fr:30000/1001 sar:8/9 sws_param
:flags=2
[scaler_out_0_0 @ 000000000272cac0] Setting 'w' to value '720'
[scaler_out_0_0 @ 000000000272cac0] Setting 'h' to value '480'
[scaler_out_0_0 @ 000000000272cac0] Setting 'flags' to value 'bicubic'
[scaler_out_0_0 @ 000000000272cac0] w:720 h:480 flags:'bicubic' interl:0
[format @ 00000000027e7880] Setting 'pix_fmts' to value 'yuv420p'
[AVFilterGraph @ 0000000002a1e940] query_formats: 6 queried, 5 merged, 0 
already done, 0 delayed
[scaler_out_0_0 @ 000000000272cac0] w:720 h:480 fmt:yuv420p sar:8/9 -> w:720 
h:480 fmt:yuv420p sar:8/9 flags:0x4
[mpeg2video @ 00000000003966c0] intra_quant_bias = 96 inter_quant_bias = 0
Output #0, dvd, to 'bob.VOB':
  Metadata:
    encoder         : Lavf58.10.100
    Stream #0:0, 0, 1/90000: Video: mpeg2video (Main), 1 reference frame, 
yuv420p(left), 720x480 [SAR 8:9 DAR 4:3], 0/1,
 q=2-31, 6000 kb/s, 29.97 fps, 90k tbn, 29.97 tbc
    Metadata:
      encoder         : Lavc58.16.100 mpeg2video
    Side data:
      cpb: bitrate max/min/avg: 9000000/0/6000000 buffer size: 1835008 
vbv_delay: -1
    Stream #0:1, 0, 1/90000: Audio: ac3, 48000 Hz, stereo, fltp, delay 256, 448 
kb/s
    Metadata:
      encoder         : Lavc58.16.100 ac3
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
    Last message repeated 303 times
cur_dts is invalid (this is harmless if it occurs once at the start per stream) 
0x
    Last message repeated 291 times
cur_dts is invalid (this is harmless if it occurs once at the start per stream) 
0x
    Last message repeated 309 times
cur_dts is invalid (this is harmless if it occurs once at the start per stream) 
0x
    Last message repeated 69 times
[ac3 @ 00000000003fe1c0] Multiple frames in a packet.
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
    Last message repeated 229 times
cur_dts is invalid (this is harmless if it occurs once at the start per stream) 
0x
    Last message repeated 18 times
[dvd @ 00000000003fe600] First SCR: 0 First DTS: 45000
[dvd @ 00000000003fe600] Non-monotonous DTS in output stream 0:1; previous: 
538080, current: 538080; changing to 538081.
 This may result in incorrect timestamps in the output file.
[dvd @ 00000000003fe600] buffer underflow st=1 bufi=1398 size=1792
[dvd @ 00000000003fe600] Non-monotonous DTS in output stream 0:1; previous: 
1266720, current: 1266720; changing to 12667
21. This may result in incorrect timestamps in the output file.
[dvd @ 00000000003fe600] Non-monotonous DTS in output stream 0:1; previous: 
1995360, current: 1995360; changing to 19953
61. This may result in incorrect timestamps in the output file.
[dvd @ 00000000003fe600] buffer underflow st=1 bufi=1396 size=1792
[dvd @ 00000000003fe600] Non-monotonous DTS in output stream 0:1; previous: 
4155360, current: 4155360; changing to 41553
61. This may result in incorrect timestamps in the output file.
[dvd @ 00000000003fe600] Non-monotonous DTS in output stream 0:1; previous: 
4884000, current: 4884000; changing to 48840
01. This may result in incorrect timestamps in the output file.
[dvd @ 00000000003fe600] buffer underflow st=1 bufi=1400 size=1792
[dvd @ 00000000003fe600] Non-monotonous DTS in output stream 0:1; previous: 
5612640, current: 5612640; changing to 56126
41. This may result in incorrect timestamps in the output file.
[dvd @ 00000000003fe600] buffer underflow st=1 bufi=1399 
size=1792=6560.2kbits/s speed=10.3x
[dvd @ 00000000003fe600] Non-monotonous DTS in output stream 0:1; previous: 
6341280, current: 6341280; changing to 63412
81. This may result in incorrect timestamps in the output file.
[dvd @ 00000000003fe600] buffer underflow st=1 bufi=1398 size=1792
[dvd @ 00000000003fe600] Non-monotonous DTS in output stream 0:1; previous: 
7069920, current: 7069920; changing to 70699
21. This may result in incorrect timestamps in the output file.
[dvd @ 00000000003fe600] buffer underflow st=1 bufi=1397 size=1792
[out_0_0 @ 000000000272c900] EOF on sink link out_0_0:default.
[out_0_1 @ 00000000003e0a00] EOF on sink link out_0_1:default.
No more output streams to write to, finishing.
frame= 2425 fps=321 q=3.3 Lsize=   65038kB time=00:01:20.89 
bitrate=6586.6kbits/s speed=10.7x
video:59318kB audio:4424kB subtitle:0kB other streams:0kB global headers:0kB 
muxing overhead: 2.032480%
Input file #0 (../../20180726_150335-phasebtop1.vob):
  Input stream #0:0 (data): 0 packets read (0 bytes);
  Input stream #0:1 (video): 2725 packets read (51214402 bytes); 2725 frames 
decoded;
  Input stream #0:2 (audio): 2831 packets read (5089280 bytes); 2840 frames 
decoded (4362240 samples);
  Total: 5556 packets (56303682 bytes) demuxed
Output file #0 (bob.VOB):
  Output stream #0:0 (video): 2425 frames encoded; 2425 packets muxed (60742090 
bytes);
  Output stream #0:1 (audio): 2528 frames encoded (3882240 samples); 2528 
packets muxed (4530176 bytes);
  Total: 4953 packets (65272266 bytes) muxed
5565 frames successfully decoded, 0 decoding errors
[AVIOContext @ 000000000039c140] Statistics: 0 seeks, 32357 writeouts
[AVIOContext @ 000000000039c840] Statistics: 61134992 bytes read, 2 seeks

c:\Developer\ffmpeg-20180330-cdd6a52-win64-static\bin>


------------------------------------------------------------------------
This is the last seemingly OK version (build 1 day older):
c:\Developer\ffmpeg-20180329-e5819fa-win64-static\bin>
c:\Developer\ffmpeg-20180329-e5819fa-win64-static\bin>ffmpeg.exe -i 
../../20180726_150335-phasebtop1.vob -ss 10 -target
ntsc-dvd -flags +cgop+ilme+ildct -alternate_scan 1 -top 1 -g 15 -sc_threshold 
1000000000 -y bob.VOB -v debug
ffmpeg version N-90480-ge5819fa629 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7.3.0 (GCC)
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib 
--enable-fontconfig --enable-gnutls --enabl
e-iconv --enable-libass --enable-libbluray --enable-libfreetype 
--enable-libmp3lame --enable-libopencore-amrnb --enable-
libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine 
--enable-libsnappy --enable-libsoxr --enable-l
ibtheora --enable-libtwolame --enable-libvpx --enable-libwavpack 
--enable-libwebp --enable-libx264 --enable-libx265 --en
able-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp 
--enable-libvidstab --enable-libvorbis --enable-l
ibvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid 
--enable-libmfx --enable-amf --enable-ffnvcodec --en
able-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 
--enable-avisynth
  libavutil      56. 12.100 / 56. 12.100
  libavcodec     58. 16.100 / 58. 16.100
  libavformat    58. 10.100 / 58. 10.100
  libavdevice    58.  2.100 / 58.  2.100
  libavfilter     7. 13.100 /  7. 13.100
  libswscale      5.  0.102 /  5.  0.102
  libswresample   3.  0.101 /  3.  0.101
  libpostproc    55.  0.100 / 55.  0.100
Splitting the commandline.
Reading option '-i' ... matched as input url with argument 
'../../20180726_150335-phasebtop1.vob'.
Reading option '-ss' ... matched as option 'ss' (set the start time offset) 
with argument '10'.
Reading option '-target' ... matched as option 'target' (specify target file 
type ("vcd", "svcd", "dvd", "dv" or "dv50"
with optional prefixes "pal-", "ntsc-" or "film-")) with argument 'ntsc-dvd'.
Reading option '-flags' ... matched as AVOption 'flags' with argument 
'+cgop+ilme+ildct'.
Reading option '-alternate_scan' ... matched as AVOption 'alternate_scan' with 
argument '1'.
Reading option '-top' ... matched as option 'top' (top=1/bottom=0/auto=-1 field 
first) with argument '1'.
Reading option '-g' ... matched as AVOption 'g' with argument '15'.
Reading option '-sc_threshold' ... matched as AVOption 'sc_threshold' with 
argument '1000000000'.
Reading option '-y' ... matched as option 'y' (overwrite output files) with 
argument '1'.
Reading option 'bob.VOB' ... matched as output url.
Reading option '-v' ... matched as option 'v' (set logging level) with argument 
'debug'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option y (overwrite output files) with argument 1.
Applying option v (set logging level) with argument debug.
Successfully parsed a group of options.
Parsing a group of options: input url ../../20180726_150335-phasebtop1.vob.
Successfully parsed a group of options.
Opening an input file: ../../20180726_150335-phasebtop1.vob.
[NULL @ 00000000005a3ec0] Opening '../../20180726_150335-phasebtop1.vob' for 
reading
[file @ 00000000005a45c0] Setting default whitelist 'file,crypto'
[mpeg @ 00000000005a3ec0] Format mpeg probed with size=2048 and score=26
[mpeg @ 00000000005a3ec0] Before avformat_find_stream_info() pos: 0 bytes 
read:32768 seeks:0 nb_streams:0
[mpeg @ 00000000005a3ec0] probing stream 1 pp:2500
[mpeg @ 00000000005a3ec0] Probe with size=2011, packets=1 detected mpegvideo 
with score=25
[mpeg @ 00000000005a3ec0] probed stream 1
[mpeg2video @ 00000000005a4b80] Format yuv420p chosen by get_format().
[mpeg @ 00000000005a3ec0] max_analyze_duration 5000000 reached at 5005000 
microseconds st:1
[mpeg @ 00000000005a3ec0] start time for stream 0 is not set in 
estimate_timings_from_pts
[mpeg @ 00000000005a3ec0] After avformat_find_stream_info() pos: 0 bytes 
read:3559568 seeks:2 frames:299
Input #0, mpeg, from '../../20180726_150335-phasebtop1.vob':
  Duration: 00:01:30.93, start: 0.528033, bitrate: 5065 kb/s
    Stream #0:0[0x1bf], 0, 1/90000: Data: dvd_nav_packet, 0/1
    Stream #0:1[0x1e0], 152, 1/90000: Video: mpeg2video (Main), 1 reference 
frame, yuv420p(tv, top first, left), 720x480
 [SAR 8:9 DAR 4:3], 0/1, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Stream #0:2[0x80], 147, 1/90000: Audio: ac3, 48000 Hz, stereo, fltp, 448 
kb/s
Successfully opened the file.
Parsing a group of options: output url bob.VOB.
Applying option ss (set the start time offset) with argument 10.
Applying option target (specify target file type ("vcd", "svcd", "dvd", "dv" or 
"dv50" with optional prefixes "pal-", "n
tsc-" or "film-")) with argument ntsc-dvd.
Applying option top (top=1/bottom=0/auto=-1 field first) with argument 1.
Successfully parsed a group of options.
Opening an output file: bob.VOB.
[file @ 00000000005abf40] Setting default whitelist 'file,crypto'
Successfully opened the file.
detected 8 logical cores
Stream mapping:
  Stream #0:1 -> #0:0 (mpeg2video (native) -> mpeg2video (native))
  Stream #0:2 -> #0:1 (ac3 (native) -> ac3 (native))
Press [q] to stop, [?] for help
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[graph_1_in_0_2 @ 000000000272fe80] Setting 'time_base' to value '1/48000'
[graph_1_in_0_2 @ 000000000272fe80] Setting 'sample_rate' to value '48000'
[graph_1_in_0_2 @ 000000000272fe80] Setting 'sample_fmt' to value 'fltp'
[graph_1_in_0_2 @ 000000000272fe80] Setting 'channel_layout' to value '0x3'
[graph_1_in_0_2 @ 000000000272fe80] tb:1/48000 samplefmt:fltp samplerate:48000 
chlayout:0x3
[format_out_0_1 @ 0000000002834ec0] Setting 'sample_fmts' to value 'fltp'
[format_out_0_1 @ 0000000002834ec0] Setting 'sample_rates' to value '48000'
[format_out_0_1 @ 0000000002834ec0] Setting 'channel_layouts' to value 
'0x4|0x3|0x103|0x7|0x603|0x33|0x107|0x607|0x37|0x
c|0xb|0x10b|0xf|0x60b|0x3b|0x10f|0x60f|0x3f'
[AVFilterGraph @ 0000000002851140] query_formats: 5 queried, 12 merged, 0 
already done, 0 delayed
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[mpeg2video @ 00000000005a68c0] Format yuv420p chosen by get_format().
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[graph 0 input from stream 0:1 @ 000000000258d140] Setting 'video_size' to 
value '720x480'
[graph 0 input from stream 0:1 @ 000000000258d140] Setting 'pix_fmt' to value 
'0'
[graph 0 input from stream 0:1 @ 000000000258d140] Setting 'time_base' to value 
'1/90000'
[graph 0 input from stream 0:1 @ 000000000258d140] Setting 'pixel_aspect' to 
value '8/9'
[graph 0 input from stream 0:1 @ 000000000258d140] Setting 'sws_param' to value 
'flags=2'
[graph 0 input from stream 0:1 @ 000000000258d140] Setting 'frame_rate' to 
value '30000/1001'
[graph 0 input from stream 0:1 @ 000000000258d140] w:720 h:480 pixfmt:yuv420p 
tb:1/90000 fr:30000/1001 sar:8/9 sws_param
:flags=2
[scaler_out_0_0 @ 000000000272cdc0] Setting 'w' to value '720'
[scaler_out_0_0 @ 000000000272cdc0] Setting 'h' to value '480'
[scaler_out_0_0 @ 000000000272cdc0] Setting 'flags' to value 'bicubic'
[scaler_out_0_0 @ 000000000272cdc0] w:720 h:480 flags:'bicubic' interl:0
[format @ 00000000025e0240] Setting 'pix_fmts' to value 'yuv420p'
[AVFilterGraph @ 0000000002851a40] query_formats: 6 queried, 5 merged, 0 
already done, 0 delayed
[scaler_out_0_0 @ 000000000272cdc0] w:720 h:480 fmt:yuv420p sar:8/9 -> w:720 
h:480 fmt:yuv420p sar:8/9 flags:0x4
[mpeg2video @ 000000000060fb00] intra_quant_bias = 96 inter_quant_bias = 0
Output #0, dvd, to 'bob.VOB':
  Metadata:
    encoder         : Lavf58.10.100
    Stream #0:0, 0, 1/90000: Video: mpeg2video (Main), 1 reference frame, 
yuv420p(left), 720x480 [SAR 8:9 DAR 4:3], 0/1,
 q=2-31, 6000 kb/s, 29.97 fps, 90k tbn, 29.97 tbc
    Metadata:
      encoder         : Lavc58.16.100 mpeg2video
    Side data:
      cpb: bitrate max/min/avg: 9000000/0/6000000 buffer size: 1835008 
vbv_delay: -1
    Stream #0:1, 0, 1/90000: Audio: ac3, 48000 Hz, stereo, fltp, delay 256, 448 
kb/s
    Metadata:
      encoder         : Lavc58.16.100 ac3
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
    Last message repeated 293 times
cur_dts is invalid (this is harmless if it occurs once at the start per stream) 
0x
    Last message repeated 289 times
cur_dts is invalid (this is harmless if it occurs once at the start per stream) 
0x
    Last message repeated 289 times
cur_dts is invalid (this is harmless if it occurs once at the start per stream) 
0x
    Last message repeated 291 times
cur_dts is invalid (this is harmless if it occurs once at the start per stream) 
0x
    Last message repeated 60 times
[dvd @ 000000000060e480] First SCR: 0 First DTS: 45000
[out_0_0 @ 000000000258d240] EOF on sink link 
out_0_0:default.rate=6564.5kbits/s speed=10.6x
[out_0_1 @ 0000000002834d00] EOF on sink link out_0_1:default.
No more output streams to write to, finishing.
frame= 2425 fps=324 q=3.3 Lsize=   65038kB time=00:01:20.89 
bitrate=6586.6kbits/s speed=10.8x
video:59318kB audio:4424kB subtitle:0kB other streams:0kB global headers:0kB 
muxing overhead: 2.032480%
Input file #0 (../../20180726_150335-phasebtop1.vob):
  Input stream #0:0 (data): 0 packets read (0 bytes);
  Input stream #0:1 (video): 2725 packets read (51214402 bytes); 2725 frames 
decoded;
  Input stream #0:2 (audio): 2840 packets read (5089280 bytes); 2840 frames 
decoded (4362240 samples);
  Total: 5565 packets (56303682 bytes) demuxed
Output file #0 (bob.VOB):
  Output stream #0:0 (video): 2425 frames encoded; 2425 packets muxed (60742090 
bytes);
  Output stream #0:1 (audio): 2528 frames encoded (3882240 samples); 2528 
packets muxed (4530176 bytes);
  Total: 4953 packets (65272266 bytes) muxed
5565 frames successfully decoded, 0 decoding errors
[AVIOContext @ 00000000005ac000] Statistics: 0 seeks, 32357 writeouts
[AVIOContext @ 00000000005ac840] Statistics: 61134992 bytes read, 2 seeks

c:\Developer\ffmpeg-20180329-e5819fa-win64-static\bin>

---------------------------------------------------------------------------------------------

Thank you for looking!
-Bob




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