[FFmpeg-trac] #2263(avformat:open): Read second SeekHead in Matroska files
FFmpeg
trac at avcodec.org
Tue Mar 19 01:43:35 CET 2013
#2263: Read second SeekHead in Matroska files
-------------------------------------+------------------------------------
Reporter: eelco | Owner:
Type: enhancement | Status: open
Priority: wish | Component: avformat
Version: git-master | Resolution:
Keywords: mkv h264 | Blocked By:
Blocking: | Reproduced by developer: 1
Analyzed by developer: 0 |
-------------------------------------+------------------------------------
Comment (by cehoyos):
mosu has kindly produced a small sample that allows to reproduce the
problem:
{{{
$ mkvmerge -o out.mkv seekhead-at-end.mkv
}}}
{{{
$ ffmpeg -ss 26.4 -i seekhead-at-end.mkv -vframes 1 outslow.png
ffmpeg version N-51078-g6128d33 Copyright (c) 2000-2013 the FFmpeg
developers
built on Mar 19 2013 00:53:13 with gcc 4.7 (SUSE Linux)
configuration: --enable-gpl --disable-indev=jack
libavutil 52. 19.101 / 52. 19.101
libavcodec 55. 1.100 / 55. 1.100
libavformat 55. 0.100 / 55. 0.100
libavdevice 55. 0.100 / 55. 0.100
libavfilter 3. 47.103 / 3. 47.103
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 'seekhead-at-end.mkv':
Metadata:
creation_time : 2013-03-18 12:09:06
Duration: 00:00:30.24, start: 0.000000, bitrate: 469 kb/s
Chapter #0.0: start 0.000000, end 15.000000
Metadata:
title : Chapter 01
Chapter #0.1: start 15.000000, end 30.241000
Metadata:
title : Chapter 02
Chapter #0.2: start 754.567000, end 30.241000
Metadata:
title : Chapter 03
Chapter #0.3: start 1200.000000, end 30.241000
Metadata:
title : Chapter 04
Chapter #0.4: start 3723.040000, end 30.241000
Metadata:
title : Chapter 05
Stream #0:0: Video: h264 (Main), yuv420p, 640x352 [SAR 1:1 DAR 20:11],
23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
Stream #0:1: Audio: aac, 48000 Hz, stereo, fltp (default)
Output #0, image2, to 'outslow.png':
Metadata:
encoder : Lavf55.0.100
Chapter #0.0: start 0.000000, end 3.841000
Metadata:
title : Chapter 02
Chapter #0.1: start 728.167000, end 3.841000
Metadata:
title : Chapter 03
Chapter #0.2: start 1173.600000, end 3.841000
Metadata:
title : Chapter 04
Chapter #0.3: start 3696.640000, end 3.841000
Metadata:
title : Chapter 05
Stream #0:0: Video: png, rgb24, 640x352 [SAR 1:1 DAR 20:11], q=2-31,
200 kb/s, 90k tbn, 23.98 tbc (default)
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> png)
Press [q] to stop, [?] for help
frame= 1 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A dup=0
drop=631
video:128kB audio:0kB subtitle:0 global headers:0kB muxing overhead
-100.016844%
real 0m0.248s
user 0m0.827s
sys 0m0.021s
}}}
{{{
$ ffmpeg -ss 26.4 -i out.mkv -vframes 1 outfast.png
ffmpeg version N-51078-g6128d33 Copyright (c) 2000-2013 the FFmpeg
developers
built on Mar 19 2013 00:53:13 with gcc 4.7 (SUSE Linux)
configuration: --enable-gpl --disable-indev=jack
libavutil 52. 19.101 / 52. 19.101
libavcodec 55. 1.100 / 55. 1.100
libavformat 55. 0.100 / 55. 0.100
libavdevice 55. 0.100 / 55. 0.100
libavfilter 3. 47.103 / 3. 47.103
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 'out.mkv':
Metadata:
creation_time : 2013-03-18 23:50:20
Duration: 00:00:30.24, start: 0.000000, bitrate: 468 kb/s
Chapter #0.0: start 0.000000, end 15.000000
Metadata:
title : Chapter 01
Chapter #0.1: start 15.000000, end 30.241000
Metadata:
title : Chapter 02
Chapter #0.2: start 754.567000, end 30.241000
Metadata:
title : Chapter 03
Chapter #0.3: start 1200.000000, end 30.241000
Metadata:
title : Chapter 04
Chapter #0.4: start 3723.040000, end 30.241000
Metadata:
title : Chapter 05
Stream #0:0: Video: h264 (Main), yuv420p, 640x352 [SAR 1:1 DAR 20:11],
23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
Stream #0:1: Audio: aac, 48000 Hz, stereo, fltp (default)
Output #0, image2, to 'outfast.png':
Metadata:
encoder : Lavf55.0.100
Chapter #0.0: start 0.000000, end 3.841000
Metadata:
title : Chapter 02
Chapter #0.1: start 728.167000, end 3.841000
Metadata:
title : Chapter 03
Chapter #0.2: start 1173.600000, end 3.841000
Metadata:
title : Chapter 04
Chapter #0.3: start 3696.640000, end 3.841000
Metadata:
title : Chapter 05
Stream #0:0: Video: png, rgb24, 640x352 [SAR 1:1 DAR 20:11], q=2-31,
200 kb/s, 90k tbn, 23.98 tbc (default)
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> png)
Press [q] to stop, [?] for help
frame= 1 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A
video:128kB audio:0kB subtitle:0 global headers:0kB muxing overhead
-100.016844%
real 0m0.040s
user 0m0.033s
sys 0m0.018s
}}}
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2263#comment:10>
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