On Wed, 17 Jul 2019, Moritz Barsnick wrote:
Had you shown us the conversion command, we would have seen that 0
video frames are being copied:
frame= 0 fps=0.0 q=-1.0 Lsize=N/A time=00:00:00.00 bitrate=N/A speed= 0x
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: unknown
I see.
I believe this may be due to your seek command "-ss 00:02". ffmpeg
cannot find any keyframes starting from your given offset, and
therefore can't begin the output stream, and produces 0 output frames.
Hm, the big video I really want to process is more than 10 min and shows
the same problem, namely there is no output frame. Can missing keyframes
still be the cause?
The output is this one:
$ ffmpeg -ss 00:00:35 -i 00149.MTS -t 00:10:25 -vcodec copy -acodec ac3 -b:a
256k /tmp/cut.mts
ffmpeg version N-94324-g806ac7d Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.11) 20160609
configuration:
libavutil 56. 30.100 / 56. 30.100
libavcodec 58. 53.101 / 58. 53.101
libavformat 58. 28.102 / 58. 28.102
libavdevice 58. 7.100 / 58. 7.100
libavfilter 7. 56.101 / 7. 56.101
libswscale 5. 4.101 / 5. 4.101
libswresample 3. 4.100 / 3. 4.100
Input #0, mpegts, from '00149.MTS':
Duration: 00:12:06.24, start: 0.521578, bitrate: 12339 kb/s
Program 1
Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(top
first), 1440x1080 [SAR 4:3 DAR 16:9], 25 fps, 50 tbr, 90k tbn, 50 tbc
Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo,
fltp, 256 kb/s
File '/tmp/cut.mts' already exists. Overwrite ? [y/N] y
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (ac3 (native) -> ac3 (native))
Press [q] to stop, [?] for help
Output #0, mpegts, to '/tmp/cut.mts':
Metadata:
encoder : Lavf58.28.102
Stream #0:0: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(top first),
1440x1080 [SAR 4:3 DAR 16:9], q=2-31, 25 fps, 50 tbr, 90k tbn, 90k tbc
Stream #0:1: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s
Metadata:
encoder : Lavc58.53.101 ac3
frame= 0 fps=0.0 q=-1.0 Lsize= 22699kB time=00:10:25.01
bitrate=297.5kbits/s speed=37.2x
video:0kB audio:19532kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 16.215258%
If you use the output option "-copyinkf", ffmpeg will copy the initial
non-keyframes and actually produce 218 output frames. The output will
probably be of little use without a single keyframe though.
ok
ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg
developers
BTW, this is a very old version.
I know. Before posting I compiled the latest version from Git, but that
produced the same result.
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