[FFmpeg-trac] #4833(undetermined:new): Long metadata truncated

FFmpeg trac at avcodec.org
Sun Sep 6 02:55:13 CEST 2015

#4833: Long metadata truncated
             Reporter:  vance003     |                     Type:
               Status:  new          |  enhancement
            Component:               |                 Priority:  wish
  undetermined                       |                  Version:  git-
             Keywords:               |  master
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
 Summary of the bug:
 For Apple / Quicktime files ffmpeg can handle metadata for the Lyrics
 ("©lyr" tag ID) and Long_Description (ldes tag ID; referred to by ffmpeg
 as "Synopsis") tags, both of which are able to exceed the standard 255
 character limit for metadata. When ffmpeg encodes or adds them, however,
 it imposes a new limit of slightly less than 1024 characters, truncating
 as needed. For most instances this is not a problem, but for some files
 the tags may exceed this new limit. Is it possible to remove this length
 limit for these two tags?

 How to reproduce (files test1.m4a and test1.txt hopefully will be attached
 for the sake of convenience):
 ffmpeg -i test1.m4a -i test1.txt -map_metadata 1 -codec copy test2.m4a
 ffmpeg -i test2.m4a -f ffmetadata test2.txt
 compare test1.txt test2.txt
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

Ticket URL: <https://trac.ffmpeg.org/ticket/4833>
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