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

FFmpeg trac at avcodec.org
Wed Sep 23 04:04:47 CEST 2015

#4833: Long metadata truncated
             Reporter:  vance003      |                    Owner:
                 Type:  enhancement   |                   Status:  new
             Priority:  wish          |                Component:  avformat
              Version:  git-master    |               Resolution:
             Keywords:  mov metadata  |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |

Comment (by vance003):

 Hmmm, since this wasn't seen as a mission critical concern by the powers-
 that-be, I did a little more digging. It appears that this defect is not
 limited to Quicktime files --- other sound files generated by ffmpeg also
 seem to allow metadata up to around 1024 characters, regardless of the
 format's specs. If one wishes to change this limit, up or down, it is
 necessary to edit ffmetadec.c in the libavformat subdirectory of the
 source code. Change line 131 (which reads, "uint8_t line[1024];" [without
 quotes]) by editing "1024" to whatever limit you desire. Recompile, and it
 appears you are good to go. Now I'll admit I know exceedingly little about
 coding in c / c++, so I am again dependent upon the coding mavens here to
 reveal whether such an adjustment will be likely to produce any untoward

Ticket URL: <https://trac.ffmpeg.org/ticket/4833#comment:6>
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