av_metadata_get does not get embeded meta data

[chinshou]

ffmepg binary was downloaded from ​http://ffmpeg.arrozcru.org/autobuilds/ffmpeg/mingw32/static/ffmpeg-r26400-swscale-r32676-mingw32-static.7z

executed ffmpeg -i 1.flv -f mp4 -metadata lyrics="abc" 1.mp4 to embed lyrics meta data to mp4 container format video file

from ​http://wiki.multimedia.cx/index.php?title=FFmpeg_Metadata, it seems lyrics metadata was supported by mp4 container.

but after conversion ,
execute ffmpeg -i 1.mp4 lyrics metadata was not displayed .

use a hex editor to edit the mp4 file , I can find "abc" text was appended at the end of mp4 file.

But it seems av_metadata_get did not read the lyrics metadata correctly. some other metadata seems ok for example title meta tag.

ffmpeg -i 1.flv -f mp4 -metadata title="abc" 1.mp4

[Michael Niedermayer]

The mp4 muxer does not store the metadata, it seems.

[reimar]

A handful of tags, among them lyrics, were written by the muxer but not read by the demuxer.
This is fixed 543f3db.