[FFmpeg-trac] #6775(avcodec:new): gst-libav can no longer decode video (3.4 regression)

[FFmpeg]

#6775: gst-libav can no longer decode video (3.4 regression)
------------------------------------+-----------------------------------
             Reporter:  heftig      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  critical    |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  regression  |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+-----------------------------------

Comment (by heleppkes):

 Replying to [comment:9 jcowgill]:
 >
 > I think there is a misunderstanding here about what a NULL packet sent
 via avcodec_video_decode2 actually does, probably because the
 documentation is a bit lacking in this area. The documentation says you
 need a NULL packet at the end of a stream, but says nothing about NULL
 packets sent at any other time. There are at least a few comments I found
 in the ffmpeg source which imply that sending a NULL packet means EOF (as
 opposed to draining, and allowing extra data later). Clearly the developer
 who wrote the compat code in 3.4 thought this as well.
 >

 The key there is that nowhere in the source or the docs it does say you
 can send a NULL packet at any other time then EOF. All mentions of NULL
 drain packets include a wording similar to "at the end" (of the stream)
 etc.

 So while it may have worked somewhat in the past (there are reports of
 this usage actually crashing with some decoders, though), the
 documentation never actually told you that this was a valid call, or
 suggested to do so in any way.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6775#comment:14>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker