At some point after ffmpeg 2.8.5 I started to see this message when stream
copying mpg2 videos:
VBV buffer size not set, using default size of 130KB
If you want the mpeg file to be compliant to some specification
Like DVD, VCD or others, make sure you set the correct buffer size
I can provide a sample mpg2 clip if necessary, but I was able to get the
same behavior by generating a short clip using ffmpeg, then stream copying
that generated clip (see output below). If I do the same thing using
ffmpeg 2.8.5 I don't get any warning message.
What do I need to do to avoid this message? I'm not even sure what
option(s) I should use to set the "VBV buffer"... I assume -bufsize and/or
-maxrate, but I tried setting both and neither made any difference.
And do either of those really need to be set for a stream COPY operation?
Examples:
Generate a 10 sec "blank" video using latest ffmpeg:
$ ffmpeg -f lavfi -i color=color=red -codec:v mpeg2video -b:v 16384k -bufsize
4096k -maxrate 30000k -t 10 -f vob TEST.mpg
ffmpeg version N-82228-gfb240a6 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 4.5.1 (GCC) 20100924 (Red Hat 4.5.1-4)
configuration: --enable-gpl --enable-version3 --enable-nonfree
--disable-static --enable-shared --disable-debug --enable-libass
--enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus
--enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264
--enable-x11grab --disable-ffplay --disable-ffserver
libavutil 55. 35.100 / 55. 35.100
libavcodec 57. 66.101 / 57. 66.101
libavformat 57. 57.100 / 57. 57.100
libavdevice 57. 2.100 / 57. 2.100
libavfilter 6. 66.100 / 6. 66.100
libswscale 4. 3.100 / 4. 3.100
libswresample 2. 4.100 / 2. 4.100
libpostproc 54. 2.100 / 54. 2.100
Input #0, lavfi, from 'color=color=red':
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 320x240 [SAR 1:1
DAR 4:3], 25 tbr, 25 tbn, 25 tbc
Output #0, vob, to 'TEST.mpg':
Metadata:
encoder : Lavf57.57.100
Stream #0:0: Video: mpeg2video (Main), yuv420p, 320x240 [SAR 1:1 DAR 4:3],
q=2-31, 16384 kb/s, 25 fps, 90k tbn, 25 tbc
Metadata:
encoder : Lavc57.66.101 mpeg2video
Side data:
cpb: bitrate max/min/avg: 30000000/0/16384000 buffer size: 4096000
vbv_delay: -1
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg2video (native))
Press [q] to stop, [?] for help
frame= 250 fps=0.0 q=2.0 Lsize= 60kB time=00:00:09.92 bitrate=
49.5kbits/s speed= 25x
video:58kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: 4.049180%
Copy video using latest ffmpeg:
$ ffmpeg -i TEST.mpg -codec copy -f vob TEST-COPY-latest.mpg
ffmpeg version N-82228-gfb240a6 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 4.5.1 (GCC) 20100924 (Red Hat 4.5.1-4)
configuration: --enable-gpl --enable-version3 --enable-nonfree
--disable-static --enable-shared --disable-debug --enable-libass
--enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus
--enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264
--enable-x11grab --disable-ffplay --disable-ffserver
libavutil 55. 35.100 / 55. 35.100
libavcodec 57. 66.101 / 57. 66.101
libavformat 57. 57.100 / 57. 57.100
libavdevice 57. 2.100 / 57. 2.100
libavfilter 6. 66.100 / 6. 66.100
libswscale 4. 3.100 / 4. 3.100
libswresample 2. 4.100 / 2. 4.100
libpostproc 54. 2.100 / 54. 2.100
Input #0, mpeg, from 'TEST.mpg':
Duration: 00:00:09.88, start: 0.540000, bitrate: 49 kb/s
Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive),
320x240 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc
[vob @ 0x9ca9fc0] VBV buffer size not set, using default size of 130KB
If you want the mpeg file to be compliant to some specification
Like DVD, VCD or others, make sure you set the correct buffer size
Output #0, vob, to 'TEST-COPY-latest.mpg':
Metadata:
encoder : Lavf57.57.100
Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, progressive), 320x240
[SAR 1:1 DAR 4:3], q=2-31, 25 fps, 25 tbr, 90k tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[vob @ 0x9ca9fc0] Timestamps are unset in a packet for stream 0. This is
deprecated and will stop working in the future. Fix your code to set the
timestamps properly
frame= 250 fps=0.0 q=-1.0 Lsize= 60kB time=00:00:09.92 bitrate=
49.5kbits/s speed=2.01e+03x
video:58kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: 4.049180%
Copy video using ffmpeg 2.8.5 (no messages):
$ ffmpeg -i TEST.mpg -codec copy -f vob TEST-COPY-2.8.5.mpg
ffmpeg version 2.8.5 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 4.5.1 (GCC) 20100924 (Red Hat 4.5.1-4)
configuration: --enable-gpl --enable-version3 --enable-nonfree
--disable-static --enable-shared --disable-debug --enable-libass
--enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus
--enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264
--enable-x11grab --disable-ffplay --disable-ffserver
libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
libpostproc 53. 3.100 / 53. 3.100
Input #0, mpeg, from 'TEST.mpg':
Duration: 00:00:09.88, start: 0.540000, bitrate: 49 kb/s
Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv), 320x240 [SAR 1:1
DAR 4:3], max. 30000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
Output #0, vob, to 'TEST-COPY-2.8.5.mpg':
Metadata:
encoder : Lavf56.40.101
Stream #0:0: Video: mpeg2video, yuv420p, 320x240 [SAR 1:1 DAR 4:3], q=2-31,
max. 30000 kb/s, 25 fps, 25 tbr, 90k tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame= 250 fps=0.0 q=-1.0 Lsize= 60kB time=00:00:09.96 bitrate=
49.3kbits/s
video:58kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: 4.049180%
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