[FFmpeg-user] Discrepancy in lengths of audio/video track
Bouke (VideoToolShed)
bouke at videotoolshed.com
Thu Mar 14 19:47:51 CET 2013
----- Original Message -----
From: "Barnett, Phillip" <PHILLIP.BARNETT at ITN.CO.UK>
To: <ffmpeg-user at ffmpeg.org>
Sent: Thursday, March 14, 2013 7:25 PM
Subject: [FFmpeg-user] Discrepancy in lengths of audio/video track
> Hi,
> I have a problem when using ffmpeg to create files for an Avid system - I
> seem unable to create audio and video mxf files of exactly the same
> length, and newer Avid systems refuse to recognise mxf files which are not
> exactly matching. All my audio files are short by one frame.
> Here is a sequence of commands, where I create an XDCAM MXF file, then
> strip out the audio and video separately to demonstrate the difference in
> length.( I've tried using -async 1 and -vsync 1)
> You'll see Duration: 00:01:35.96 and Duration: 00:01:35.94 for the video
> and audio respectively.
>
> Any ideas?
Eer, i'm a bit tired, but few things i don't understand:
-vtag is for QT, not MXF, right?
-Is -your codec definition indeed XDcam (or the Avid equivalent) compatible?
(That's a new one for me...)
-How does Avid see the MXF? Are you AMA'ing it in?
-Last, does -shortest not help you here if Avid does not like the
difference?
Bouke
> Phillip
>
> C:\metamorph>ffmpeg -i "C:\5 news videos\Am I the only deaf
> teenager_.mp4" -thre
> ads 8 -r 25 -vcodec mpeg2video -s 1920x1080 -vb 5000k -qscale 1 -pix_fmt
> yuv422p
> -vtag xd5c -ar 48000 -async 1 intermediate.mxf
> ffmpeg version N-50911-g9efcfbe Copyright (c) 2000-2013 the FFmpeg
> developers
> built on Mar 13 2013 21:31:52 with gcc 4.7.2 (GCC)
> configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
> isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls
> --enab
> le-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libg
> sm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libo
> pencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li
> bschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-lib
> twolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enabl
> e-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
> libavutil 52. 19.100 / 52. 19.100
> libavcodec 55. 0.100 / 55. 0.100
> libavformat 55. 0.100 / 55. 0.100
> libavdevice 54. 4.100 / 54. 4.100
> libavfilter 3. 45.103 / 3. 45.103
> libswscale 2. 2.100 / 2. 2.100
> libswresample 0. 17.102 / 0. 17.102
> libpostproc 52. 2.100 / 52. 2.100
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\5 news videos\Am I the only
> deaf tee
> nager_.mp4':
> Metadata:
> major_brand : mp42
> minor_version : 0
> compatible_brands: isommp42
> creation_time : 2012-03-28 09:41:36
> Duration: 00:01:35.96, start: 0.000000, bitrate: 1713 kb/s
> Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
> 1280x720,
> 1558 kb/s, 25 fps, 25 tbr, 50 tbn, 50 tbc
> Metadata:
> creation_time : 1970-01-01 00:00:00
> handler_name : VideoHandler
> Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo,
> fltp, 15
> 1 kb/s
> Metadata:
> creation_time : 2012-03-28 09:41:36
> handler_name : IsoMedia File Produced by Google, 5-11-2011
> Please use -q:a or -q:v, -qscale is ambiguous
> File 'intermediate.mxf' already exists. Overwrite ? [y/N] y
> -async is forwarded to lavfi similarly to -af
> aresample=async=1:min_hard_comp=0.
> 100000:first_pts=0.
> Output #0, mxf, to 'intermediate.mxf':
> Metadata:
> major_brand : mp42
> minor_version : 0
> compatible_brands: isommp42
> encoder : Lavf55.0.100
> Stream #0:0(und): Video: mpeg2video (xd5c / 0x63356478), yuv422p,
> 1920x1080,
> q=2-31, 5000 kb/s, 25 tbn, 25 tbc
> Metadata:
> creation_time : 1970-01-01 00:00:00
> handler_name : VideoHandler
> Stream #0:1(und): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
> Metadata:
> creation_time : 2012-03-28 09:41:36
> handler_name : IsoMedia File Produced by Google, 5-11-2011
> Stream mapping:
> Stream #0:0 -> #0:0 (h264 -> mpeg2video)
> Stream #0:1 -> #0:1 (aac -> pcm_s16le)
> Press [q] to stop, [?] for help
> frame= 56 fps=0.0 q=1.0 size= 1384kB time=00:00:02.16
> bitrate=5247.1kbits/s
> frame= 110 fps=108 q=1.0 size= 3690kB time=00:00:04.41
> bitrate=6853.1kbits/s
> frame= 162 fps=107 q=1.0 size= 5267kB time=00:00:06.40
> bitrate=6741.1kbits/s
> frame= 216 fps=107 q=1.0 size= 7947kB time=00:00:08.80
> bitrate=7398.0kbits/s
> frame= 268 fps=106 q=1.0 size= 11108kB time=00:00:10.75
> bitrate=8464.7kbits/s
> frame= 312 fps=103 q=1.0 size= 18743kB time=00:00:12.70
> bitrate=12088.8kbits/
> frame= 356 fps=100 q=1.0 size= 26290kB time=00:00:14.16
> bitrate=15205.5kbits/
> frame= 405 fps=100 q=1.0 size= 30484kB time=00:00:16.18
> bitrate=15430.4kbits/
> frame= 457 fps=101 q=1.0 size= 33665kB time=00:00:18.55
> bitrate=14865.3kbits/
> frame= 504 fps=100 q=1.0 size= 39877kB time=00:00:20.50
> bitrate=15933.0kbits/
> frame= 553 fps= 99 q=1.0 size= 45148kB time=00:00:22.45
> bitrate=16472.2kbits/
> frame= 604 fps=100 q=1.0 size= 49449kB time=00:00:24.40
> bitrate=16599.2kbits/
> frame= 642 fps= 98 q=1.0 size= 59503kB time=00:00:25.86
> bitrate=18844.8kbits/
> frame= 699 fps= 99 q=1.0 size= 61114kB time=00:00:28.30
> bitrate=17687.6kbits/
> frame= 749 fps= 99 q=1.0 size= 64206kB time=00:00:30.25
> bitrate=17384.6kbits/
> frame= 799 fps= 99 q=1.0 size= 67553kB time=00:00:32.20
> bitrate=17183.2kbits/
> frame= 849 fps= 99 q=1.0 size= 70122kB time=00:00:34.38
> bitrate=16704.4kbits/
> frame= 901 fps= 99 q=1.0 size= 72864kB time=00:00:36.52
> bitrate=16342.3kbits/
> frame= 956 fps=100 q=1.0 size= 75169kB time=00:00:38.45
> bitrate=16014.5kbits/
> frame= 1009 fps=100 q=1.0 size= 77470kB time=00:00:40.84
> bitrate=15538.1kbits/
> frame= 1060 fps=100 q=1.0 size= 79992kB time=00:00:42.77
> bitrate=15321.0kbits/
> frame= 1110 fps=100 q=1.0 size= 82744kB time=00:00:44.69
> bitrate=15164.9kbits/
> frame= 1159 fps=100 q=1.0 size= 85705kB time=00:00:46.62
> bitrate=15058.2kbits/
> frame= 1208 fps=100 q=1.0 size= 89307kB time=00:00:48.52
> bitrate=15075.5kbits/
> frame= 1257 fps=100 q=1.0 size= 92220kB time=00:00:50.47
> bitrate=14965.8kbits/
> frame= 1308 fps=100 q=1.0 size= 95160kB time=00:00:52.84
> bitrate=14750.8kbits/
> frame= 1358 fps=100 q=1.0 size= 98403kB time=00:00:54.77
> bitrate=14716.8kbits/
> frame= 1408 fps=100 q=1.0 size= 102014kB time=00:00:56.70
> bitrate=14738.3kbits/
> frame= 1459 fps=100 q=1.0 size= 104673kB time=00:00:58.60
> bitrate=14631.0kbits/
> frame= 1509 fps=100 q=1.0 size= 107643kB time=00:01:00.53
> bitrate=14567.2kbits/
> frame= 1559 fps=100 q=1.0 size= 110750kB time=00:01:02.92
> bitrate=14417.9kbits/
> frame= 1610 fps=100 q=1.0 size= 113658kB time=00:01:04.85
> bitrate=14356.9kbits/
> frame= 1660 fps=100 q=1.0 size= 116685kB time=00:01:06.78
> bitrate=14313.8kbits/
> frame= 1708 fps= 99 q=1.0 size= 120114kB time=00:01:08.68
> bitrate=14326.0kbits/
> frame= 1757 fps= 99 q=1.0 size= 123243kB time=00:01:10.61
> bitrate=14298.1kbits/
> frame= 1811 fps=100 q=1.0 size= 125306kB time=00:01:13.00
> bitrate=14061.2kbits/
> frame= 1864 fps=100 q=1.0 size= 127866kB time=00:01:14.93
> bitrate=13979.3kbits/
> frame= 1914 fps=100 q=1.0 size= 133417kB time=00:01:16.85
> bitrate=14220.5kbits/
> frame= 1970 fps=100 q=1.0 size= 135156kB time=00:01:19.24
> bitrate=13971.0kbits/
> frame= 2025 fps=100 q=1.0 size= 136952kB time=00:01:21.19
> bitrate=13816.6kbits/
> frame= 2075 fps=100 q=1.0 size= 140789kB time=00:01:23.56
> bitrate=13801.2kbits/
> frame= 2126 fps=100 q=1.0 size= 143605kB time=00:01:25.49
> bitrate=13759.9kbits/
> frame= 2172 fps=100 q=1.0 size= 148848kB time=00:01:27.42
> bitrate=13947.9kbits/
> frame= 2217 fps=100 q=1.0 size= 152869kB time=00:01:28.86
> bitrate=14092.6kbits/
> frame= 2265 fps=100 q=1.0 size= 156314kB time=00:01:30.76
> bitrate=14107.9kbits/
> frame= 2316 fps=100 q=1.0 size= 158947kB time=00:01:33.18
> bitrate=13973.7kbits/
> frame= 2368 fps=100 q=1.0 size= 161546kB time=00:01:35.08
> bitrate=13917.9kbits/
> frame= 2399 fps=100 q=1.0 Lsize= 162921kB time=00:01:35.94
> bitrate=13910.5kbits
> /s
> video:141786kB audio:17990kB subtitle:0 global headers:0kB muxing overhead
> 1.968
> 976%
>
> C:\metamorph>ffmpeg -i intermediate.mxf -an -vcodec copy video.mxf
> ffmpeg version N-50911-g9efcfbe Copyright (c) 2000-2013 the FFmpeg
> developers
> built on Mar 13 2013 21:31:52 with gcc 4.7.2 (GCC)
> configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
> isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls
> --enab
> le-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libg
> sm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libo
> pencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li
> bschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-lib
> twolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enabl
> e-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
> libavutil 52. 19.100 / 52. 19.100
> libavcodec 55. 0.100 / 55. 0.100
> libavformat 55. 0.100 / 55. 0.100
> libavdevice 54. 4.100 / 54. 4.100
> libavfilter 3. 45.103 / 3. 45.103
> libswscale 2. 2.100 / 2. 2.100
> libswresample 0. 17.102 / 0. 17.102
> libpostproc 52. 2.100 / 52. 2.100
> Guessed Channel Layout for Input Stream #0.1 : stereo
> Input #0, mxf, from 'intermediate.mxf':
> Metadata:
> timecode : 00:00:00:00
> Duration: 00:01:35.96, start: 0.000000, bitrate: 13908 kb/s
> Stream #0:0: Video: mpeg2video (4:2:2), yuv422p, 1920x1080 [SAR 1:1 DAR
> 16:9
> ], 25 fps, 25 tbr, 25 tbn, 50 tbc
> Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
> File 'video.mxf' already exists. Overwrite ? [y/N] y
> Output #0, mxf, to 'video.mxf':
> Metadata:
> timecode : 00:00:00:00
> encoder : Lavf55.0.100
> Stream #0:0: Video: mpeg2video, yuv422p, 1920x1080 [SAR 1:1 DAR 16:9],
> q=2-3
> 1, 25 fps, 25 tbn, 25 tbc
> Stream mapping:
> Stream #0:0 -> #0:0 (copy)
> Press [q] to stop, [?] for help
> intermediate.mxf: Operation not permitted
> frame= 2399 fps=0.0 q=-1.0 Lsize= 143722kB time=00:01:35.92
> bitrate=12274.5kbit
> s/s
> video:141786kB audio:0kB subtitle:0 global headers:0kB muxing overhead
> 1.365510%
>
>
> C:\metamorph>ffmpeg -i intermediate.mxf -vn -acodec copy audio.wav
> ffmpeg version N-50911-g9efcfbe Copyright (c) 2000-2013 the FFmpeg
> developers
> built on Mar 13 2013 21:31:52 with gcc 4.7.2 (GCC)
> configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
> isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls
> --enab
> le-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libg
> sm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libo
> pencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li
> bschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-lib
> twolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enabl
> e-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
> libavutil 52. 19.100 / 52. 19.100
> libavcodec 55. 0.100 / 55. 0.100
> libavformat 55. 0.100 / 55. 0.100
> libavdevice 54. 4.100 / 54. 4.100
> libavfilter 3. 45.103 / 3. 45.103
> libswscale 2. 2.100 / 2. 2.100
> libswresample 0. 17.102 / 0. 17.102
> libpostproc 52. 2.100 / 52. 2.100
> Guessed Channel Layout for Input Stream #0.1 : stereo
> Input #0, mxf, from 'intermediate.mxf':
> Metadata:
> timecode : 00:00:00:00
> Duration: 00:01:35.96, start: 0.000000, bitrate: 13908 kb/s
> Stream #0:0: Video: mpeg2video (4:2:2), yuv422p, 1920x1080 [SAR 1:1 DAR
> 16:9
> ], 25 fps, 25 tbr, 25 tbn, 50 tbc
> Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
> File 'audio.wav' already exists. Overwrite ? [y/N] y
> Output #0, wav, to 'audio.wav':
> Metadata:
> ISMP : 00:00:00:00
> ISFT : Lavf55.0.100
> Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz,
> stereo, 153
> 6 kb/s
> Stream mapping:
> Stream #0:1 -> #0:0 (copy)
> Press [q] to stop, [?] for help
> intermediate.mxf: Operation not permitted
> size= 17990kB time=00:01:35.94 bitrate=1536.0kbits/s
> video:0kB audio:17990kB subtitle:0 global headers:0kB muxing overhead
> 0.000543%
>
> C:\metamorph>ffmpeg -i C:\metamorph\audio.wav
> ffmpeg version N-50911-g9efcfbe Copyright (c) 2000-2013 the FFmpeg
> developers
> built on Mar 13 2013 21:31:52 with gcc 4.7.2 (GCC)
> configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
> isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls
> --enab
> le-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libg
> sm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libo
> pencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li
> bschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-lib
> twolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enabl
> e-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
> libavutil 52. 19.100 / 52. 19.100
> libavcodec 55. 0.100 / 55. 0.100
> libavformat 55. 0.100 / 55. 0.100
> libavdevice 54. 4.100 / 54. 4.100
> libavfilter 3. 45.103 / 3. 45.103
> libswscale 2. 2.100 / 2. 2.100
> libswresample 0. 17.102 / 0. 17.102
> libpostproc 52. 2.100 / 52. 2.100
> [wav @ 000000000033a3e0] max_analyze_duration 5000000 reached at 5013333
> microse
> conds
> Guessed Channel Layout for Input Stream #0.0 : stereo
> Input #0, wav, from 'C:\metamorph\audio.wav':
> Metadata:
> encoder : Lavf55.0.100
> timecode : 00:00:00:00
> Duration: 00:01:35.94, bitrate: 1536 kb/s
> Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz,
> stereo, s16
> , 1536 kb/s
> At least one output file must be specified
>
> C:\metamorph>ffmpeg -i C:\metamorph\video.mxf
> ffmpeg version N-50911-g9efcfbe Copyright (c) 2000-2013 the FFmpeg
> developers
> built on Mar 13 2013 21:31:52 with gcc 4.7.2 (GCC)
> configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
> isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls
> --enab
> le-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libg
> sm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libo
> pencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li
> bschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-lib
> twolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enabl
> e-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
> libavutil 52. 19.100 / 52. 19.100
> libavcodec 55. 0.100 / 55. 0.100
> libavformat 55. 0.100 / 55. 0.100
> libavdevice 54. 4.100 / 54. 4.100
> libavfilter 3. 45.103 / 3. 45.103
> libswscale 2. 2.100 / 2. 2.100
> libswresample 0. 17.102 / 0. 17.102
> libpostproc 52. 2.100 / 52. 2.100
> Input #0, mxf, from 'C:\metamorph\video.mxf':
> Metadata:
> timecode : 00:00:00:00
> Duration: 00:01:35.96, start: 0.000000, bitrate: 12269 kb/s
> Stream #0:0: Video: mpeg2video (4:2:2), yuv422p, 1920x1080 [SAR 1:1 DAR
> 16:9
> ], 25 fps, 25 tbr, 25 tbn, 50 tbc
> At least one output file must be specified
>
>
>
> [http://images.itn.co.uk/images/ITN_Master_blue.gif]
>
> PHILLIP BARNETT
> SERVER MANAGER
>
> 200 GRAY'S INN ROAD
> LONDON
> WC1X 8XZ
> UNITED KINGDOM
> T +44 207 430 4474
> E PHILLIP.BARNETT at ITN.CO.UK
> WWW.ITN.CO.UK
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