Bug#863663: libgstreamer1.0-0: plays MJPEG AVI files (and possibly other formats) at degraded quality

[Sebastian Dröge]

On Wed, 2017-05-31 at 22:14 +0200, Francesco Poli wrote:
> On Wed, 31 May 2017 10:09:46 +0300 Sebastian Dröge wrote:
> 
> [...]
> > Thanks for the sample file.
> 
> You're welcome.
> 
> > I can reproduce this here and it's caused
> > by the libjpeg based decoder from GStreamer. The one based on
> > ffmpeg
> > works just fine.
> 
> How can I force GStreamer to use the ffmpeg based decoder with
> gst-launch-1.0?
> And from within an application that uses the GStreamer library?

See what I wrote in the upstream bug report. You can explicitly use
avdec_mjpeg in a custom pipeline.

For using it automatically in decodebin/playbin, you would have to
adjust the ranks of jpegparse and avdec_mjpeg. Either by changing their
code, or from your application with gst_plugin_feature_set_rank().
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