Ticket #2333 (new defect)
mkv + ac3 remux adds a little time
| Reported by: | Squeeto | Owned by: | |
|---|---|---|---|
| Priority: | normal | Component: | undetermined |
| Version: | unspecified | Keywords: | |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description
ffmpeg adds time to the muxed mkv and demuxed mkv:
ffmpeg version N-50025-gb8bb661 Copyright (c) 2000-2013 the FFmpeg developers
built on Feb 17 2013 02:37:45 with gcc 4.7.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-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. 38.100 / 3. 38.100
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
ffmpeg -i input.mkv -i input.ac3 -map 0:0 -map 1:0 -vcodec copy -acodec copy -y done.mkv
Input #0, matroska,webm, from 'input.mkv':
Duration: 00:00:12.85, start: 0.000000, bitrate: 6039 kb/s
Input #0, ac3, from 'input.ac3':
Duration: 00:00:12.86, start: 0.000000, bitrate: 256 kb/s
Input #0, matroska,webm, from 'done.mkv':
Metadata:
ENCODER : Lavf54.63.100
Duration: 00:00:12.93, start: 0.000000, bitrate: 6256 kb/s
ffmpeg -i done.mkv -an -vcodec copy -y demux.mkv
ffmpeg -i done.mkv -acodec copy -vn -y demux.ac3
Input #0, matroska,webm, from 'demux.mkv':
Metadata:
ENCODER : Lavf54.63.100
Duration: 00:00:12.91, start: 0.000000, bitrate: 6008 kb/s
Input #0, ac3, from 'demux.ac3':
Duration: 00:00:12.86, start: 0.000000, bitrate: 256 kb/s
Change History
comment:2 in reply to: ↑ 1 Changed 3 months ago by Squeeto
Replying to cehoyos:
To make this a valid ticket, please provide your failing command line including complete, unedited console output and please consider using a "Code block".
Please note the Duration discrepancies:
ffmpeg -i input.mkv -i input.ac3 -map 0:0 -map 1:0 -vcodec copy -acodec copy -y done.mkv
ffmpeg version N-50025-gb8bb661 Copyright (c) 2000-2013 the FFmpeg developers
built on Feb 17 2013 02:37:45 with gcc 4.7.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-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. 38.100 / 3. 38.100
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
Input #0, matroska,webm, from 'input.mkv':
Duration: 00:00:12.85, start: 0.000000, bitrate: 6039 kb/s
Stream #0:0(eng): Video: h264 (High), yuv420p, 1920x1080, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 20k tbn, 59.94 tbc (default)
[ac3 @ 025ad320] max_analyze_duration 5000000 reached at 5024000 microseconds
[ac3 @ 025ad320] Estimating duration from bitrate, this may be inaccurate
Input #1, ac3, from 'input.ac3':
Duration: 00:00:12.86, start: 0.000000, bitrate: 256 kb/s
Stream #1:0: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s
Output #0, matroska, to 'done.mkv':
Metadata:
encoder : Lavf54.63.100
Stream #0:0(eng): Video: h264 (H264 / 0x34363248), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 29.97 fps, 1k tbn, 20k tbc (default)
Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, 256 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #1:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 385 fps=0.0 q=-1.0 Lsize= 9876kB time=00:00:12.86 bitrate=6289.3kbits/s
video:9468kB audio:402kB subtitle:0 global headers:0kB muxing overhead 0.065323%
ffmpeg -i done.mkv -an -vcodec copy -y demux.mkv
ffmpeg version N-50025-gb8bb661 Copyright (c) 2000-2013 the FFmpeg developers
built on Feb 17 2013 02:37:45 with gcc 4.7.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-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. 38.100 / 3. 38.100
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
Input #0, matroska,webm, from 'done.mkv':
Metadata:
ENCODER : Lavf54.63.100
Duration: 00:00:12.93, start: 0.000000, bitrate: 6256 kb/s
Stream #0:0(eng): Video: h264 (High), yuv420p, 1920x1080, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc (default)
Stream #0:1: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s
Output #0, matroska, to 'demux.mkv':
Metadata:
encoder : Lavf54.63.100
Stream #0:0(eng): Video: h264 (H264 / 0x34363248), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 29.97 fps, 1k tbn, 1k tbc (default)
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame= 385 fps=0.0 q=-1.0 Lsize= 9471kB time=00:00:12.81 bitrate=6055.1kbits/s
video:9468kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.038442%
ffmpeg -i done.mkv -acodec copy -vn -y demux.ac3
ffmpeg version N-50025-gb8bb661 Copyright (c) 2000-2013 the FFmpeg developers
built on Feb 17 2013 02:37:45 with gcc 4.7.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-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. 38.100 / 3. 38.100
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
Input #0, matroska,webm, from 'done.mkv':
Metadata:
ENCODER : Lavf54.63.100
Duration: 00:00:12.93, start: 0.000000, bitrate: 6256 kb/s
Stream #0:0(eng): Video: h264 (High), yuv420p, 1920x1080, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc (default)
Stream #0:1: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s
Output #0, ac3, to 'demux.ac3':
Metadata:
encoder : Lavf54.63.100
Stream #0:0: Audio: ac3, 48000 Hz, stereo, 256 kb/s
Stream mapping:
Stream #0:1 -> #0:0 (copy)
Press [q] to stop, [?] for help
size= 402kB time=00:00:12.93 bitrate= 254.7kbits/s
video:0kB audio:402kB subtitle:0 global headers:0kB muxing overhead 0.000000%
ffmpeg -i demux.mkv
ffmpeg version N-50025-gb8bb661 Copyright (c) 2000-2013 the FFmpeg developers
built on Feb 17 2013 02:37:45 with gcc 4.7.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-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. 38.100 / 3. 38.100
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
Input #0, matroska,webm, from 'demux.mkv':
Metadata:
ENCODER : Lavf54.63.100
Duration: 00:00:12.91, start: 0.000000, bitrate: 6008 kb/s
Stream #0:0(eng): Video: h264 (High), yuv420p, 1920x1080, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc (default)
At least one output file must be specified
ffmpeg -i demux.ac3
ffmpeg version N-50025-gb8bb661 Copyright (c) 2000-2013 the FFmpeg developers
built on Feb 17 2013 02:37:45 with gcc 4.7.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-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. 38.100 / 3. 38.100
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
[ac3 @ 0226b420] max_analyze_duration 5000000 reached at 5024000 microseconds
[ac3 @ 0226b420] Estimating duration from bitrate, this may be inaccurate
Input #0, ac3, from 'demux.ac3':
Duration: 00:00:12.86, start: 0.000000, bitrate: 256 kb/s
Stream #0:0: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s
At least one output file must be specified
comment:3 Changed 2 months ago by Squeeto
Has my question been properly requested?
It has been a week so I am not sure if you are still waiting.
Recap:
input.mkv 12.85 sec input.ac3 12.86 done.mkv (ffmpeg copy) 12.93 demux.mkv 12.91 demux.ac3 12.86
comment:4 Changed 2 months ago by cehoyos
If I understand correctly, you fear that remuxing makes your audio files longer. The only way to prove this is to decode both the original file and the remuxed file to wav files and compare them.
Or do I misunderstand the issue?
comment:5 in reply to: ↑ 1 Changed 2 months ago by Squeeto
I started this question at http://ffmpeg.zeranoe.com/forum; it was there that the demuxed times were asked for trouble-shooting purposes.
I only want to mux the input.mkv and input.ac3. I would prefer to use ffmpeg but I noticed that mkvmerge makes a done.mkv of 12.86 seconds. Why does ffmpeg add a little time? Does it matter? Can I still splice together done.mkv, done2.mkv, done3.mkv, etc. and expect doneTotal.mkv to be okay?
I am not concerned that input.ac3 is a little longer than input.mkv.
Thank you
comment:6 Changed 2 months ago by Squeeto
Hi again.
I found this branch of ffmpeg called ffmbc that creates an output mkv file of 12.86 seconds as I am hoping for.
ffmpeg -i done_ffmbc.mkv
ffmpeg version N-50025-gb8bb661 Copyright (c) 2000-2013 the FFmpeg developers
built on Feb 17 2013 02:37:45 with gcc 4.7.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-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. 38.100 / 3. 38.100
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
Input #0, matroska,webm, from 'done_ffmbc.mkv':
Metadata:
ENCODER : FFmbc 0.7
Duration: 00:00:12.86, start: 0.000000, bitrate: 6289 kb/s
Stream #0:0: Video: h264 (High), yuv420p, 1920x1080, SAR 1:1 DAR 16:9, 20k fps, 20k tbr, 1k tbn, 59.94 tbc (default)
Stream #0:1: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s (default)
At least one output file must be specified
To make this a valid ticket, please provide your failing command line including complete, unedited console output and please consider using a "Code block".