#2790: FFmpeg moves content of first chapter from a mkv file into global
-------------------------------------+-------------------------------------
Reporter: xZise | Type: defect
Status: new | Priority: minor
Component: | Version: git-
undetermined | master
Keywords: chapter | Blocked By:
matroska | Reproduced by developer: 0
Blocking: |
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
When I create a mkv file with chapters using the ffmetadata file and then
parse it by ffmpeg again, it will remove the first chapter and some
metadata of it become global.
How to reproduce:
{{{
% ./ffmpeg -i src_meta.txt -i src_video.webm -c copy tgt_video.mkv
ffmpeg version N-54769-g5ceffb1 Copyright (c) 2000-2013 the FFmpeg
developers
built on Jul 16 2013 22:14:51 with gcc 4.6 (Ubuntu/Linaro
4.6.3-1ubuntu5)
configuration: --disable-yasm
libavutil 52. 39.100 / 52. 39.100
libavcodec 55. 18.102 / 55. 18.102
libavformat 55. 12.102 / 55. 12.102
libavdevice 55. 3.100 / 55. 3.100
libavfilter 3. 81.101 / 3. 81.101
libswscale 2. 3.100 / 2. 3.100
libswresample 0. 17.102 / 0. 17.102
Input #0, ffmetadata, from 'src_meta.txt':
Duration: 00:00:09.42, start: 0.000000, bitrate: 0 kb/s
Chapter #0.0: start 0.000000, end 0.990000
Metadata:
TITLE : Chapter 1
TYPE : c1
Chapter #0.1: start 1.000000, end 9.420000
Metadata:
TITLE : Chapter 2
TYPE : c2
Input #1, matroska,webm, from 'src_video.webm':
Duration: 00:00:09.42, start: 0.000000, bitrate: 1827 kb/s
Stream #1:0: Video: vp8, yuv420p, 1280x720, SAR 1:1 DAR 16:9, 25 fps,
25 tbr, 1k tbn, 1k tbc (default)
Stream #1:1: Audio: vorbis, 48000 Hz, stereo, fltp (default)
Output #0, matroska, to 'tgt_video.mkv':
Metadata:
encoder : Lavf55.12.102
Chapter #0.0: start 0.000000, end 0.990000
Metadata:
TITLE : Chapter 1
TYPE : c1
Chapter #0.1: start 1.000000, end 9.420000
Metadata:
TITLE : Chapter 2
TYPE : c2
Stream #0:0: Video: vp8 (VP80 / 0x30385056), yuv420p, 1280x720 [SAR
1:1 DAR 16:9], q=2-31, 25 fps, 1k tbn, 1k tbc (default)
Stream #0:1: Audio: vorbis (oV[0][0] / 0x566F), 48000 Hz, stereo
(default)
Stream mapping:
Stream #1:0 -> #0:0 (copy)
Stream #1:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 234 fps=0.0 q=-1.0 Lsize= 2101kB time=00:00:09.39
bitrate=1831.7kbits/s
video:1945kB audio:146kB subtitle:0 global headers:0kB muxing overhead
0.467363%
% ./ffmpeg -i tgt_video.mkv -f ffmetadata tgt_meta.txt
ffmpeg version N-54769-g5ceffb1 Copyright (c) 2000-2013 the FFmpeg
developers
built on Jul 16 2013 22:14:51 with gcc 4.6 (Ubuntu/Linaro
4.6.3-1ubuntu5)
configuration: --disable-yasm
libavutil 52. 39.100 / 52. 39.100
libavcodec 55. 18.102 / 55. 18.102
libavformat 55. 12.102 / 55. 12.102
libavdevice 55. 3.100 / 55. 3.100
libavfilter 3. 81.101 / 3. 81.101
libswscale 2. 3.100 / 2. 3.100
libswresample 0. 17.102 / 0. 17.102
Input #0, matroska,webm, from 'tgt_video.mkv':
Metadata:
ENCODER : Lavf55.12.102
TYPE : c1
Duration: 00:00:09.42, start: 0.000000, bitrate: 1827 kb/s
Chapter #0.0: start 1.000000, end 9.420000
Metadata:
title : Chapter 2
TYPE : c2
Stream #0:0: Video: vp8, yuv420p, 1280x720, SAR 1:1 DAR 16:9, 25 fps,
25 tbr, 1k tbn, 1k tbc (default)
Stream #0:1: Audio: vorbis, 48000 Hz, stereo, fltp (default)
Output #0, ffmetadata, to 'tgt_meta.txt':
Metadata:
ENCODER : Lavf55.12.102
TYPE : c1
Chapter #0.0: start 1.000000, end 9.420000
Metadata:
title : Chapter 2
TYPE : c2
Stream mapping:
Press [q] to stop, [?] for help
size= 0kB time=-577014:-32:-22.-77 bitrate=N/A
video:0kB audio:0kB subtitle:0 global headers:0kB muxing overhead inf%
Output file is empty, nothing was encoded (check -ss / -t / -frames
parameters if used)
}}}
As you can see, the first chapter is missing and starts directly with the
second. Additionally it shows the TYPE metadata of the first chapter in
the global metadata.
I used mkvtoolnix to look into the file and there the first chapter
exists, so it looks like the decoding failed. Although I tried it with
another proprietary mkv file and there it works fine. Unfortunately I
can't upload that file.
I used [http://http://commons.wikimedia.org/wiki/File:Chinese_Signal.webm]
to encode and this is the metadata file:
{{{
;FFMETADATA1
[CHAPTER]
TIMEBASE=1/100
START=0
END=99
TITLE=Chapter 1
TYPE=c1
[CHAPTER]
TIMEBASE=1/100
START=100
END=942
TITLE=Chapter 2
TYPE=c2
}}}
And mkvtoolnix is producing the following:
{{{
+ EBML head
|+ EBML version: 1
|+ EBML read version: 1
|+ EBML maximum ID length: 4
|+ EBML maximum size length: 8
|+ Doc type: matroska
|+ Doc type version: 2
|+ Doc type read version: 2
+ Segment, size 2151327
|+ Seek head (subentries will be skipped)
|+ EbmlVoid (size: 133)
|+ Segment information
| + Timecode scale: 1000000
| + Muxing application: Lavf55.12.102
| + Writing application: Lavf55.12.102
| + Segment UID:0xf2 0x8c 0x0b 0x70 0x15 0x18 0x4d 0x25 0x54 0xc7 0xfd
0xd7 0x92 0x17 0xe7 0x31
| + Duration: 9.417s (00:00:09.417)
|+ Segment tracks
| + A track
| + Track number: 1
| + Track UID: 1
| + Lacing flag: 0
| + Language: und
| + Default flag: 1
| + Codec ID: V_VP8
| + Track type: video
| + Default duration: 40.000ms (25.000 fps for a video track)
| + Video track
| + Pixel width: 1280
| + Pixel height: 720
| + Display width: 1280
| + Display height: 720
| + A track
| + Track number: 2
| + Track UID: 2
| + Lacing flag: 0
| + Language: und
| + Default flag: 1
| + Codec ID: A_VORBIS
| + Track type: audio
| + Audio track
| + Channels: 2
| + Sampling frequency: 48000
| + Bit depth: 32
| + CodecPrivate, length 4256
|+ Chapters
| + EditionEntry
| + EditionFlagDefault: 1
| + EditionFlagHidden: 0
| + ChapterAtom
| + ChapterUID: 0
| + ChapterTimeStart: 00:00:00.000000000
| + ChapterTimeEnd: 00:00:00.990000000
| + ChapterFlagHidden: 0
| + ChapterFlagEnabled: 1
| + ChapterDisplay
| + ChapterString: Chapter 1
| + ChapterLanguage: und
| + ChapterAtom
| + ChapterUID: 1
| + ChapterTimeStart: 00:00:01.000000000
| + ChapterTimeEnd: 00:00:09.420000000
| + ChapterFlagHidden: 0
| + ChapterFlagEnabled: 1
| + ChapterDisplay
| + ChapterString: Chapter 2
| + ChapterLanguage: und
|+ Tags
| + Tag
| + Targets
| + Simple
| + Name: ENCODER
| + String: Lavf55.12.102
| + Tag
| + Targets
| + ChapterUID: 0
| + Simple
| + Name: TYPE
| + String: c1
| + Tag
| + Targets
| + ChapterUID: 1
| + Simple
| + Name: TYPE
| + String: c2
|+ Cluster
}}}
Thanks in advance.
Fabian
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2790>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker
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