Unexported Ogg metadata

[Clément Bœsch]

% ./ffmpeg -f lavfi -i testsrc=d=5 -c:v libtheora -metadata title=hello -metadata comment=world -y out.ogg   
ffmpeg version N-42157-g9d0c71e Copyright (c) 2000-2012 the FFmpeg developers
  built on Jul  3 2012 11:11:58 with gcc 4.7.1
  configuration: --enable-gpl --enable-fontconfig --enable-libfreetype --enable-libmp3lame --cc='ccache cc' --enable-libx264 --enable-libvorbis --enable-libmodplug --enable-libass --enable-libtheora --samples=/home/cboesch/fate-samples --prefix=/home/cboesch/src/ff/ffmpeg/ffmpeg_build
  libavutil      51. 63.100 / 51. 63.100
  libavcodec     54. 32.100 / 54. 32.100
  libavformat    54. 14.100 / 54. 14.100
  libavdevice    54.  0.100 / 54.  0.100
  libavfilter     3.  0.101 /  3.  0.101
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
[Parsed_testsrc_0 @ 0x3361de0] size:320x240 rate:25/1 duration:5.000000 sar:1/1
[out @ 0x3361d20] No opaque field provided
[lavfi @ 0x3361160] Estimating duration from bitrate, this may be inaccurate
Input #0, lavfi, from 'testsrc=d=5':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
[graph 0 input from stream 0:0 @ 0x33640a0] w:320 h:240 pixfmt:rgb24 tb:1/25 fr:25/1 sar:1/1 sws_param:flags=2
[output stream 0:0 @ 0x3363e20] No opaque field provided
[auto-inserted scaler 0 @ 0x3365060] w:320 h:240 fmt:rgb24 sar:1/1 -> w:320 h:240 fmt:yuv420p sar:1/1 flags:0x4
Output #0, ogg, to 'out.ogg':
  Metadata:
    title           : hello
    comment         : world
    encoder         : Lavf54.14.100
    Stream #0:0: Video: theora, yuv420p, 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo -> libtheora)
Press [q] to stop, [?] for help
frame=  125 fps=0.0 q=0.0 Lsize=     129kB time=00:00:05.00 bitrate= 211.9kbits/s    
video:125kB audio:0kB subtitle:0 global headers:3kB muxing overhead 0.951183%

The title & comment meta appear in VLC, but don't with FFmpeg tools:

% ./ffprobe -v 0 -show_format -show_streams out.ogg|grep TAG
%

% ./ffmpeg -i out.ogg -y out.ffmeta
ffmpeg version N-42157-g9d0c71e Copyright (c) 2000-2012 the FFmpeg developers
  built on Jul  3 2012 11:11:58 with gcc 4.7.1
  configuration: --enable-gpl --enable-fontconfig --enable-libfreetype --enable-libmp3lame --cc='ccache cc' --enable-libx264 --enable-libvorbis --enable-libmodplug --enable-libass --enable-libtheora --samples=/home/cboesch/fate-samples --prefix=/home/cboesch/src/ff/ffmpeg/ffmpeg_build
  libavutil      51. 63.100 / 51. 63.100
  libavcodec     54. 32.100 / 54. 32.100
  libavformat    54. 14.100 / 54. 14.100
  libavdevice    54.  0.100 / 54.  0.100
  libavfilter     3.  0.101 /  3.  0.101
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
Input #0, ogg, from 'out.ogg':
  Duration: 00:00:05.00, start: 0.000000, bitrate: 211 kb/s
    Stream #0:0: Video: theora, yuv420p, 320x240 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
Output #0, ffmetadata, to 'out.ffmeta':
Stream mapping:
Press [q] to stop, [?] for help
size=       0kB time=577014:32:22.77 bitrate=   0.0kbits/s    
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)

% cat out.ffmeta
;FFMETADATA1
%