[FFmpeg-trac] #6616(avcodec:new): Decoded frames contain information about previous encoded frame

[FFmpeg]

#6616: Decoded frames contain information about previous encoded frame
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             Reporter:  rubensanchez  |                    Owner:
                 Type:  defect        |                   Status:  new
             Priority:  normal        |                Component:  avcodec
              Version:  git-master    |               Resolution:
             Keywords:                |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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Comment (by heleppkes):

 Replying to [comment:3 rubensanchez]:
 > Replying to [comment:2 Cigaes]:
 > > It looks like you are modifying the frame data returned by the
 decoder, are you not?
 >
 > Yes, the application must modify the decoded frames in order to apply an
 overlay image.

 Well, there is your problem then. Frames are not guaranteed to be
 writeable, because they can still be used as reference frames by the
 decoder - which results in what you are seeing here.

 If you need to write to a frame, you can use "av_frame_make_writable",
 which will copy the data if the frame is read-only, so you don't mess with
 the reference frame.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6616#comment:4>
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