[FFmpeg-user] Issue trimming an AVI
Francois Visagie
francois.visagie at gmail.com
Tue Feb 19 08:49:38 CET 2013
> -----Original Message-----
> From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-
> bounces at ffmpeg.org] On Behalf Of CJ Myers
> Sent: 19 February 2013 02:53
> To: ffmpeg-user at ffmpeg.org
> Subject: [FFmpeg-user] Issue trimming an AVI
>
> I am trying to trim a long AVI file into episodes. I do not want to
re-encode,
> so I use the copy feature when I identify the codecs. I can successfully
get
> the chunk I want, but it doesn't play properly in WMP or VLC. ffplay
works
> fine.
>
> Originally, when I attempted to play the trimmed file, the video and audio
> was garbled and unwatchable. I installed a new codec pack, and that
helped,
> but didn't fix it. Now in WMP, the video seems fine, but the audio
doesn't
> play except for random "clicks" In VLC, the audio plays along with the
video,
> but it is MUCH faster than the video. (It's like listening to the
chipmunks).
My guess it's a keyframe issue. You instructed ffmpeg NOT to re-encode any
frames, but did you ensure the trim starts on a keyframe? Put differently,
I'm unsure what ffmpeg does when instructed to copy and encoding starts on a
non-keyframe.
> When I take the file and upload it to YouTube, it works fine in YouTube!
>
> Here is the command I used:
> ffmpeg -i "java 2013-02-09 15-27-08-331.avi" -t 0:38:19.90 -c:v copy -c:a
copy -
> map 0 Ep1test.avi
Besides the point, but is the -map parameter superfluous here?
> (I also tried the above with just -c copy, with identical results)
>
> Here is the output I get when I run the command:
> ffmpeg version N-49997-gb9c5448 Copyright (c) 2000-2013 the FFmpeg
> developers
> built on Feb 16 2013 02:32:10 with gcc 4.7.2 (GCC)
> configuration: --enable-gpl --enable-version3 --disable-w32threads --
> enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r
--enable-
> gnutls --enab le-libass --enable-libbluray --enable-libcaca --enable-
> libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-
> amrnb --enable-libopencore-amrwb --e nable-libopenjpeg --enable-libopus -
> -enable-librtmp --enable-libschroedinger --enable-libsoxr
--enable-libspeex -
> -enable-libtheora --enable-libtwolame --enable- libvo-aacenc
--enable-libvo-
> amrwbenc --enable-libvorbis --enable-libvpx
> --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
> libavutil 52. 17.101 / 52. 17.101
> libavcodec 54. 91.103 / 54. 91.103
> libavformat 54. 63.100 / 54. 63.100
> libavdevice 54. 3.103 / 54. 3.103
> libavfilter 3. 37.103 / 3. 37.103
> libswscale 2. 2.100 / 2. 2.100
> libswresample 0. 17.102 / 0. 17.102
> libpostproc 52. 2.100 / 52. 2.100
> [avi @ 000000000030c140] non-interleaved AVI Input #0, avi, from 'java
2013-
> 02-09 15-27-08-331.avi':
> Metadata:
> encoder : BandiAviMuxer 1.0
> Duration: 03:01:48.46, start: 0.000000, bitrate: 2694 kb/s
> Stream #0:0: Video: mpeg1video (MPEG / 0x4745504D), yuv420p, 1224x720
> [SAR 1:1 DAR 17:10], 104857 kb/s, 30 tbr, 30 tbn, 30 tbc
> Stream #0:1: Audio: mp2 (P[0][0][0] / 0x0050), 48000 Hz, stereo, s16p,
> 160 kb/s
> [NULL @ 00000000003301a0] requested bits_per_coded_sample (16) and
> actually stored (0) differ Output #0, avi, to 'Ep1test.avi':
> Metadata:
> ISFT : Lavf54.63.100
> Stream #0:0: Video: mpeg1video (mpg1 / 0x3167706D), yuv420p, 1224x720
> [SAR 1:1 DAR 17:10], q=2-31, 104857 kb/s, 30 tbn, 30 tbc
> Stream #0:1: Audio: mp2 (P[0][0][0] / 0x0050), 48000 Hz, stereo, 160
kb/s
> Stream mapping:
> Stream #0:0 -> #0:0 (copy)
> Stream #0:1 -> #0:1 (copy)
> Press [q] to stop, [?] for help
> frame=68998 fps=2789 q=-1.0 Lsize= 756917kB time=00:38:19.93
> bitrate=2696.0kbits/s video:708103kB audio:44920kB subtitle:0 global
> headers:0kB muxing overhead 0.517093%
>
> And here is the header info on the source and dest files:
> D:\Media\Videos\BandiCam\Minecraft Edited>ffmpeg -i "java 2013-02-09 15-
> 27-08-331.avi"
> ffmpeg version N-49997-gb9c5448 Copyright (c) 2000-2013 the FFmpeg
> developers
> built on Feb 16 2013 02:32:10 with gcc 4.7.2 (GCC)
> configuration: --enable-gpl --enable-version3 --disable-w32threads --
> enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r
--enable-
> gnutls --enab le-libass --enable-libbluray --enable-libcaca --enable-
> libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-
> amrnb --enable-libopencore-amrwb --e nable-libopenjpeg --enable-libopus -
> -enable-librtmp --enable-libschroedinger --enable-libsoxr
--enable-libspeex -
> -enable-libtheora --enable-libtwolame --enable- libvo-aacenc
--enable-libvo-
> amrwbenc --enable-libvorbis --enable-libvpx
> --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
> libavutil 52. 17.101 / 52. 17.101
> libavcodec 54. 91.103 / 54. 91.103
> libavformat 54. 63.100 / 54. 63.100
> libavdevice 54. 3.103 / 54. 3.103
> libavfilter 3. 37.103 / 3. 37.103
> libswscale 2. 2.100 / 2. 2.100
> libswresample 0. 17.102 / 0. 17.102
> libpostproc 52. 2.100 / 52. 2.100
> [avi @ 000000000030bd20] non-interleaved AVI Input #0, avi, from 'java
2013-
> 02-09 15-27-08-331.avi':
> Metadata:
> encoder : BandiAviMuxer 1.0
> Duration: 03:01:48.46, start: 0.000000, bitrate: 2694 kb/s
> Stream #0:0: Video: mpeg1video (MPEG / 0x4745504D), yuv420p, 1224x720
> [SAR 1:1 DAR 17:10], 104857 kb/s, 30 tbr, 30 tbn, 30 tbc
> Stream #0:1: Audio: mp2 (P[0][0][0] / 0x0050), 48000 Hz, stereo, s16p,
> 160 kb/s
> At least one output file must be specified
>
> D:\Media\Videos\BandiCam\Minecraft Edited>ffplay -i Ep1test.avi ffplay
> version N-49997-gb9c5448 Copyright (c) 2003-2013 the FFmpeg developers
> built on Feb 16 2013 02:32:10 with gcc 4.7.2 (GCC)
> configuration: --enable-gpl --enable-version3 --disable-w32threads --
> enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r
--enable-
> gnutls --enab le-libass --enable-libbluray --enable-libcaca --enable-
> libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-
> amrnb --enable-libopencore-amrwb --e nable-libopenjpeg --enable-libopus -
> -enable-librtmp --enable-libschroedinger --enable-libsoxr
--enable-libspeex -
> -enable-libtheora --enable-libtwolame --enable- libvo-aacenc
--enable-libvo-
> amrwbenc --enable-libvorbis --enable-libvpx
> --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
> libavutil 52. 17.101 / 52. 17.101
> libavcodec 54. 91.103 / 54. 91.103
> libavformat 54. 63.100 / 54. 63.100
> libavdevice 54. 3.103 / 54. 3.103
> libavfilter 3. 37.103 / 3. 37.103
> libswscale 2. 2.100 / 2. 2.100
> libswresample 0. 17.102 / 0. 17.102
> libpostproc 52. 2.100 / 52. 2.100
> [avi @ 00000000020932e0] sample size (1) != block align (1152)0KB sq=
0B
> f=0/0
> [avi @ 00000000020932e0] non-interleaved AVIaq= 0KB vq= 0KB sq=
0B
> f=0/0
> [mpeg1video @ 00000000020a5340] sequence header damagedvq= 0KB sq=
> 0B
> f=0/0
> -922Input #0, avi, from 'Ep1test.avi':= 0 aq= 0KB vq= 0KB sq=
0B
> f=0/0
> 3372 Metadata:
> 0368 encoder : 5477Lavf54.63.1005808
> .00 A Duration: -V: 00:38:19.93 0.0, start: 00 f0.000000d= , bitrate: 0
> a2696 kb/sq=
> 0KB Stream #0:0 vq= : Video: mpeg1video (mpg1 / 0x3167706D), yuv420p,
> 1224x720 [SAR 1:1 DAR 17:10], 104857 kb/s 0, 30 tbrKB s, 30 tbnq= , 30
> tbc 0B
> Stream #0:1: Audio: mp2 (P[0][0][0] / 0x0050), 48000 Hz, stereo, s16p,
> 160 kb/s
> [mpeg1video @ 00000000020a5340] sequence header damaged
> 1.82 A-V: -0.424 fd= 0 aq= 37KB vq= 12KB sq= 0B f=0/0
>
> Thanks for the help!
>
> ~CJ
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