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

Francesco Poli invernomuto at paranoici.org
Thu Jun 1 21:47:08 UTC 2017

On Thu, 01 Jun 2017 09:21:16 +0300 Sebastian Dröge wrote:

> On Wed, 2017-05-31 at 22:14 +0200, Francesco Poli wrote:
> > 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.

It seems to me that there are two identical command lines in the
upstream bug report. Or did I misunderstand something?

I tried with

  $ gst-launch-1.0 filesrc location=wave_anim.avi \! avidemux \! avdec_mjpeg \! autovideosink
  $ gst-launch-1.0 filesrc location=wave_anim.avi \! avdec_mjpeg \! autovideosink

to no avail.
Both pipelines abort with errors (although they spit different error

I apologize, but I am totally clueless about the meaning of GStreamer
pipelines... Please bear with me...   :-(

> 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().

As documented [here]?

[here]: <http://www.manpagez.com/html/gstreamer-1.0/gstreamer-1.0-1.4.5/GstPluginFeature.php#gst-plugin-feature-set-rank>

Which is the feature that corresponds to avdec_mjpeg?
Which is the one corresponding to jpegdec?

Please let me know: thanks a lot for your time and patience!

 There's not a second to spare! To the laboratory!
..................................................... Francesco Poli .
 GnuPG key fpr == CA01 1147 9CD2 EFDF FB82  3925 3E1C 27E1 1F69 BFFE
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