[FFmpeg-trac] #4848(avformat:new): Tagging of webm files is incomplete

FFmpeg trac at avcodec.org
Sat Sep 19 16:24:32 CEST 2015

#4848: Tagging of webm files is incomplete
             Reporter:  nexus07     |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  mkv         |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |

Comment (by nexus07):

 I have uploaded such a webm file here (as part of an archive):


 When the file is opened by VLC media player, the information is visible in
 the "Current Media Information" window. The file is also playable when
 embedded in a HTML5 Tag by Mozilla Firefox.

 It is an "artificial" webm file because I found no program which writes
 these information directly into the webm container. After creation it
 contains no

 TAGS container (ID=0x1254C367) before the Cluster container

 Maybe this also is an issue for the webm project. Maybe the TAGS container
 was forgotten in the official specification, but inserting the TAGS into
 the webm container seems not to make problems.

 Maybe this "bug" is a feature request, which is IMHO in the interest of
 many video producers:

 ffmpeg -i <input>.webm -c copy -metadata ... <output>.webm

 should insert a TAGS container with the metadata information into the
 output webm file.

Ticket URL: <https://trac.ffmpeg.org/ticket/4848#comment:3>
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