#3859: mp4: start_time never zero
-------------------------------------+-------------------------------------
Reporter: blacktrash | Owner:
Type: defect | Status: new
Priority: normal | Component:
Version: git-master | undetermined
Keywords: | Resolution:
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
-------------------------------------+-------------------------------------
Comment (by blacktrash):
Replying to [comment:1 cehoyos]:
> Are external libraries like libx264 and libfaac necessary to reproduce
this?
{{{
$ ffmpeg -i BigBuckBunny_640x360.m4v test.ts
ffmpeg version N-65628-g6c36b3a Copyright (c) 2000-2014 the FFmpeg
developers
built on Aug 14 2014 15:21:41 with Apple LLVM version 5.1
(clang-503.0.40) (based on LLVM 3.4svn)
configuration: --enable-gpl --enable-version3 --enable-nonfree
--disable-ffserver --enable-shared --enable-libfdk-aac --enable-libx265
--enable-libx264 --enable-libxvid --enable-libfaac --enable-libmp3lame
--enable-libtheora --enable-libvorbis --enable-libvpx --enable-libvidstab
--extra-cflags=-I/sw/include --extra-libs=-L/sw/lib
libavutil 54. 3.100 / 54. 3.100
libavcodec 56. 0.100 / 56. 0.100
libavformat 56. 1.100 / 56. 1.100
libavdevice 56. 0.100 / 56. 0.100
libavfilter 5. 0.100 / 5. 0.100
libswscale 3. 0.100 / 3. 0.100
libswresample 1. 0.100 / 1. 0.100
libpostproc 53. 0.100 / 53. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'BigBuckBunny_640x360.m4v':
Metadata:
major_brand : M4V
minor_version : 1
compatible_brands: M4V M4A mp42isom
creation_time : 2008-06-03 05:23:28
copyright : © 2008 Blender Foundation | www.bigbuckbunny.org
title : Big Buck Bunny
artist : Peach Open Movie Team
composer : Sacha Goedegebure / Ton Roosendaal
date : 2008
Duration: 00:09:56.46, start: 0.000000, bitrate: 1626 kb/s
Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo,
fltp, 127 kb/s (default)
Metadata:
creation_time : 2008-06-03 05:23:28
handler_name : Apple Sound Media Handler
Stream #0:1(eng): Video: h264 (Constrained Baseline) (avc1 /
0x31637661), yuv420p(tv, smpte170m), 640x360, 1495 kb/s, 24 fps, 24 tbr,
2400 tbn, 4800 tbc (default)
Metadata:
creation_time : 2008-06-03 05:23:28
handler_name : Apple Video Media Handler
Output #0, mpegts, to 'test.ts':
Metadata:
major_brand : M4V
minor_version : 1
compatible_brands: M4V M4A mp42isom
date : 2008
copyright : © 2008 Blender Foundation | www.bigbuckbunny.org
title : Big Buck Bunny
artist : Peach Open Movie Team
composer : Sacha Goedegebure / Ton Roosendaal
encoder : Lavf56.1.100
Stream #0:0(eng): Video: mpeg2video, yuv420p, 640x360, q=2-31, 200
kb/s, 24 fps, 90k tbn, 24 tbc (default)
Metadata:
creation_time : 2008-06-03 05:23:28
handler_name : Apple Video Media Handler
encoder : Lavc56.0.100 mpeg2video
Stream #0:1(eng): Audio: mp2, 44100 Hz, stereo, s16, 384 kb/s
(default)
Metadata:
creation_time : 2008-06-03 05:23:28
handler_name : Apple Sound Media Handler
encoder : Lavc56.0.100 mp2
Stream mapping:
Stream #0:1 -> #0:0 (h264 (native) -> mpeg2video (native))
Stream #0:0 -> #0:1 (aac (native) -> mp2 (native))
Press [q] to stop, [?] for help
frame=14316 fps=1316 q=31.0 Lsize= 55390kB time=00:09:56.46 bitrate=
760.7kbits/s
video:20870kB audio:27960kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 13.433609%
$ ffprobe -show_entries format=start_time test.ts
ffprobe version N-65628-g6c36b3a Copyright (c) 2007-2014 the FFmpeg
developers
built on Aug 14 2014 15:21:41 with Apple LLVM version 5.1
(clang-503.0.40) (based on LLVM 3.4svn)
configuration: --enable-gpl --enable-version3 --enable-nonfree
--disable-ffserver --enable-shared --enable-libfdk-aac --enable-libx265
--enable-libx264 --enable-libxvid --enable-libfaac --enable-libmp3lame
--enable-libtheora --enable-libvorbis --enable-libvpx --enable-libvidstab
--extra-cflags=-I/sw/include --extra-libs=-L/sw/lib
libavutil 54. 3.100 / 54. 3.100
libavcodec 56. 0.100 / 56. 0.100
libavformat 56. 1.100 / 56. 1.100
libavdevice 56. 0.100 / 56. 0.100
libavfilter 5. 0.100 / 5. 0.100
libswscale 3. 0.100 / 3. 0.100
libswresample 1. 0.100 / 1. 0.100
libpostproc 53. 0.100 / 53. 0.100
Input #0, mpegts, from 'test.ts':
Duration: 00:09:56.51, start: 1.430756, bitrate: 760 kb/s
Program 1
Metadata:
service_name : Big Buck Bunny
service_provider: FFmpeg
Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
yuv420p(tv), 640x360 [SAR 1:1 DAR 16:9], max. 104857 kb/s, 24 fps, 24 tbr,
90k tbn, 48 tbc
Stream #0:1[0x101](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 44100 Hz,
stereo, s16p, 371 kb/s
[FORMAT]
start_time=1.430756
[/FORMAT]
> Which applications warn about failing lipsync?
{{{
$ mediafilesegmenter -t 10 test.mp4 | head -n 3
Aug 16 2014 12:15:42.587: Using floating point is not backward compatible
to iOS 4.1 or earlier devices
Aug 16 2014 12:15:42.588: Processing file /Users/chris/Movies/test.mp4
Aug 16 2014 12:15:42.602: track 1 of /Users/chris/Movies/test.mp4 contains
edit list that the media doesn't start at beginning; this may cause
problems in lip sync
}}}
> Do you really see A/V desync with any media player?
I had a user complaining about it. As it's minimal, you'd need input you
a) know extremely well and b) is a steady talking head or some such, and I
don't havesomething like that available.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/3859#comment:2>
FFmpeg <https://ffmpeg.org>
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