[FFmpeg-trac] #5936(avcodec:closed): Colored haze in mpeg4 decoding (purple, yellow, ...) (was: Purple haze in mpeg4 decoding)
FFmpeg
trac at avcodec.org
Tue Nov 22 01:31:00 EET 2016
#5936: Colored haze in mpeg4 decoding (purple, yellow,...)
-------------------------------------+-------------------------------------
Reporter: te36 | Owner:
Type: defect | Status: closed
Priority: important | Component: avcodec
Version: git-master | Resolution: fixed
Keywords: asp | Blocked By:
regression | Reproduced by developer: 1
Blocking: |
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Comment (by te36):
Thank you for the quick fix!. Seems to be solving the issues.
Suggested release-note/info for the bugfix:
Certain encoder combinations (eg: mencoder/libxvid) can result in correct
mpeg 4 part 2 encodings that also display correctly with non-ffmpeg based
decoders (eg: windows media player) but that causes colored haze with
ffmpeg decoding based application (eg: VLC, Kodi). This bugfix solves this
decoding issue.
Certain versions of FFMpeg caused incorrect mpeg 4 part 2 encodings that
cause colored haze with ffmpeg and non-ffmpeg decoders. When decoding
those encodings with a fixed version of ffmpeg, it recognizes the
incorrect encoding by the FFmpeg version number encoded in the metadata of
the media and activate a workaround for the decoding. This workaround can
be manually invoked ("bug iedge"). The affected released versions of
FFmpeg use libavcodec [55.67.101... 57.64.100] or
[57.65.100...57.66.104].
---
Tested:
Checked video archive for encodings with buggy ffmpeg encoding. Luckily
only one file.
NOK file does display incorrectly with windows media player (non ffmpeg)
and non-fixed ffmpeg. It does display correctly with fixed ffmpeg.
OK files display correctly with windows media player and do play
incorrectly with non-fixed ffmpeg/ffplay. They do play correctly with
fixed ffmpeg/ffplay.
Tried to re-create OK encodings that cause this problem, but can only
recreate with mencoder/libxvid. Using ffmpeg/libxvid with same parameters
does not cause problem at all. Maybe i was doing something wrong, if not
then encoding problems might have been rare to ffmpeg users.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/5936#comment:9>
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