Re: Bug#863663: libgstreamer1.0-0: plays MJPEG AVI files (and possibly other formats) at degraded quality
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Re: Bug#863663: libgstreamer1.0-0: plays MJPEG AVI files (and possibly other formats) at degraded quality
 
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On Thu, 15 Jun 2017 10:09:10 +0300 Sebastian Dröge wrote:
[...] > Please ask GStreamer development > related question on the GStreamer mailing list, someone else will be > able to help you there: > https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel Dear Sebastian, dear GStreamer developers, while waiting for the actual bug to be fixed in GStreamer, I am trying to modify the application (pdf-presenter-console, which is written in Vala) in order to work around the bug and force the GStreamer library to use avdec_mjpeg, in stead of jpegdec. For those who need more context, please take a look at the [Debian bug #863663] and at the [GStreamer bug 783267]. [Debian bug #863663]: <https://bugs.debian.org/863663> [GStreamer bug 783267]: <https://bugzilla.gnome.org/show_bug.cgi?id=783267> Well, my attempts to work around the bug are failing miserably! :-( Please someone help me! The code I added gets a reference to the GStreamer registry singleton by using Gst.Registry.get() . Then, it invokes its lookup_feature() method to find "jpegdec" and "avdec_mjpeg". It checks their ranks with get_rank() and finds jpegdec → rank 256 avdec_mjpeg → rank 64 It then sets swapped ranks with set_rank() : jpegdec → rank 64 avdec_mjpeg → rank 256 which are checked again and found to be set as desired. Nonetheless, the AVI file is still played at degraded quality, as if nothing had changed at all. The added Vala code (which I hereby release under the terms of the GNU GPL v2 or later) is: GLib.printerr("trying to access the GStreamer registry...\n"); Gst.Registry regist = Gst.Registry.get(); GLib.printerr("looking for jpegdec...\n"); Gst.PluginFeature jdplugin = regist.lookup_feature("jpegdec"); if (jdplugin != null) { GLib.printerr("jpegdec found with rank %u\n", jdplugin.get_rank()); jdplugin.set_rank(64); GLib.printerr("jpegdec set to rank %u\n", jdplugin.get_rank()); } else { GLib.printerr("jpegdec not found!\n"); } GLib.printerr("looking for avdec_mjpeg...\n"); Gst.PluginFeature mjplugin = regist.lookup_feature("avdec_mjpeg"); if (mjplugin != null) { GLib.printerr("avdec_mjpeg found with rank %u\n", mjplugin.get_rank()); mjplugin.set_rank(256); GLib.printerr("avdec_mjpeg set to rank %u\n", mjplugin.get_rank()); } else { GLib.printerr("avdec_mjpeg not found!\n"); } The output that I get is: trying to access the GStreamer registry... looking for jpegdec... jpegdec found with rank 256 jpegdec set to rank 64 looking for avdec_mjpeg... avdec_mjpeg found with rank 64 avdec_mjpeg set to rank 256 If I instead set jpegdec to rank 1, GStreamer spits out the following error: Gstreamer error Your GStreamer installation is missing a plug-in. Hence, it seems that I am actually modifying the ranks and that these modified ranks actually change something. But I seem to be unable to persuade GStreamer to use avdec_mjpeg in stead of jpegdec! Where am I going wrong? Could someone please take a look at this and provide some help? Thanks a lot for your time. -- http://www.inventati.org/frx/ 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 _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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Re: Bug#863663: libgstreamer1.0-0: plays MJPEG AVI files (and possibly other formats) at degraded quality
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On Sun, 2017-06-18 at 13:01 +0200, Francesco Poli wrote:
> [...] > jpegdec → rank 256 > avdec_mjpeg → rank 64 > > It then sets swapped ranks with set_rank() : > > jpegdec → rank 64 > avdec_mjpeg → rank 256 > > which are checked again and found to be set as desired. > > Nonetheless, the AVI file is still played at degraded quality, > as if nothing had changed at all. And jpegparse has a rank of 0, so will never be automatically used. Try setting the jpegparse rank to 256 too, avdec_mjpeg to 256 and jpegdec to 0. _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Bug#863663: libgstreamer1.0-0: plays MJPEG AVI files (and possibly other formats) at degraded quality
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On Tue, 20 Jun 2017 08:55:41 +0300 Sebastian Dröge wrote:
> On Sun, 2017-06-18 at 13:01 +0200, Francesco Poli wrote: > > [...] > > jpegdec → rank 256 > > avdec_mjpeg → rank 64 > > > > It then sets swapped ranks with set_rank() : > > > > jpegdec → rank 64 > > avdec_mjpeg → rank 256 > > > > which are checked again and found to be set as desired. > > > > Nonetheless, the AVI file is still played at degraded quality, > > as if nothing had changed at all. > > The problem here is that avdec_mjpeg needs jpegparse, jpegdec doesn't. > And jpegparse has a rank of 0, so will never be automatically used. > > Try setting the jpegparse rank to 256 too, avdec_mjpeg to 256 and > jpegdec to 0. I have also added the setting of videoconvert rank to 256 (it was 0), since the manual pipeline that worked with gst-launch-1.0 also included videoconvert. The debug output (the format was slightly changed) was: accessing the GStreamer registry... jpegdec rank changed from 256 to 0 avdec_mjpeg rank changed from 64 to 256 jpegparse rank changed from 0 to 256 videoconvert rank changed from 0 to 256 Gstreamer error Your GStreamer installation is missing a plug-in. Gstreamer error Internal data stream error. As you can see, setting jpegdec rank to 0 causes GStreamer to complain about a missing plug-in and no movie is played. :-( If I instead set jpegdec rank to 64, I get no error, but the movie is again played at degraded quality (showing that jpegdec is again magically selected, despite having lower rank than everything else!). The debug output was: accessing the GStreamer registry... jpegdec rank changed from 256 to 64 avdec_mjpeg rank changed from 64 to 256 jpegparse rank changed from 0 to 256 videoconvert rank changed from 0 to 256 At this point I really cannot understand what's going on and why all my attempts are failing... :-( -- http://www.inventati.org/frx/ 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 _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Bug#863663: libgstreamer1.0-0: plays MJPEG AVI files (and possibly other formats) at degraded quality
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On Wed, 21 Jun 2017 21:52:43 +0200 Francesco Poli wrote:
[...] > At this point I really cannot understand what's going on and why all my > attempts are failing... :-( Could someone please shed some light on this mystery? Thanks for your time. Bye. -- http://www.inventati.org/frx/ 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 _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Bug#863663: libgstreamer1.0-0: plays MJPEG AVI files (and possibly other formats) at degraded quality
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Re: Bug#863663: libgstreamer1.0-0: plays MJPEG AVI files (and possibly other formats) at degraded quality
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On Tue, 27 Jun 2017 10:34:54 +0900 Yasushi SHOJI wrote:
> Hi, Hello, thanks for your reply. > > On Sun, Jun 25, 2017 at 2:50 AM, Francesco Poli <[hidden email]> > wrote: > > > > On Wed, 21 Jun 2017 21:52:43 +0200 Francesco Poli wrote: > > > > [...] > > > At this point I really cannot understand what's going on and why all my > > > attempts are failing... :-( > > > > Could someone please shed some light on this mystery? > > I might be misunderstanding but the following pipeline seems to work > here without any > ranking change on my Debian Sid. > > $ gst-launch-1.0 -v filesrc location=wave_anim.avi ! avidemux ! jpegparse ! > avdec_mjpeg ! videoconvert ! autovideosink > That's clear: the gst-launch-1.0 command line able to correctly play the AVI file has already been suggested. The problem here is: how can I modify an application (written in Vala) that uses the GStreamer library to use avdec_mjpeg for MJPEG AVI files. The attempts to modify the ranks were intended to guide the GStreamer library in the automatic decoder selection process, so that it would select avdec_mjpeg for MJPEG AVI files. But, for some mysterious reason, all those attempts seem to fail miserably... Is there any alternative approach? P.S.: Please Cc me, as well as the Debian bug address and the gstreamer-devel mailing list. Thanks for your understanding! -- http://www.inventati.org/frx/ 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 _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Bug#863663: libgstreamer1.0-0: plays MJPEG AVI files (and possibly other formats) at degraded quality
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On Tue, 27 Jun 2017 23:34:08 +0200 Francesco Poli wrote:
[...] > Is there any alternative approach? Just to clarify: while waiting for [bug 783267] to be fixed[^NOTE], I am looking for a workaround. [bug 783267]: <https://bugzilla.gnome.org/show_bug.cgi?id=783267> [^NOTE]: by the way, is there any progress?!? could someone please fix the bug once and for all?!? I was trying to adjust the ranks from within the application in order to convince the GStreamer library to select the equivalent of the following pipeline for MJPEG AVI files: $ gst-launch-1.0 filesrc location=wave_anim.avi \! avidemux \! jpegparse \! avdec_mjpeg \! videoconvert \! autovideosink But all my attempts seem to fail. On the other hand, since in my use case all the movies are MJPEG AVI files, another temporary workaround could be to force the above pipeline manually. Could someone please help me? The application is pdf-presenter-console also known as [pdfpc]. The code that sets the GStreamer pipeline is (I think) in the establish_pipeline() method included in the file [src/classes/action/movie.vala]. I believe that this method sets up a generic pipeline (suitable for any file format supported by GStreamer). How should I modify that method to force the use of the above mentioned pipeline (avidemux \! jpegparse \! avdec_mjpeg \! videoconvert), which is only suitable for MJPEG AVI files? [pdfpc]: <https://pdfpc.github.io/> [src/classes/action/movie.vala]: <https://github.com/pdfpc/pdfpc/blob/d1c17b0d91f0dcd2128ec60086c86d3d8dc251c4/src/classes/action/movie.vala> > P.S.: Please Cc me, as well as the Debian bug address and the > gstreamer-devel mailing list. Thanks for your understanding! -- http://www.inventati.org/frx/ 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 _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Bug#863663: libgstreamer1.0-0: plays MJPEG AVI files (and possibly other formats) at degraded quality
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On Wed, 28 Jun 2017 22:27:00 +0200 Francesco Poli wrote:
[...] > waiting for [bug 783267] to be fixed [...] > > [bug 783267]: <https://bugzilla.gnome.org/show_bug.cgi?id=783267> Is there any progress on this bug? Please let me know: I am looking forward to seeing this issue fixed once and for all... Thanks for your time! P.S.: Please Cc me, as well as the Debian bug address and the gstreamer-devel mailing list. Thanks for your understanding! -- http://www.inventati.org/frx/ 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 _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Bug#863663: libgstreamer1.0-0: plays MJPEG AVI files (and possibly other formats) at degraded quality
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On Sat, 19 Aug 2017 15:04:51 +0200 Francesco Poli wrote:
> On Wed, 28 Jun 2017 22:27:00 +0200 Francesco Poli wrote: > > [...] > > waiting for [bug 783267] to be fixed > [...] > > > > [bug 783267]: <https://bugzilla.gnome.org/show_bug.cgi?id=783267> > > Is there any progress on this bug? > Please let me know: I am looking forward to seeing this issue fixed > once and for all... > > Thanks for your time! Thanks for your understanding. > P.S.: Please Cc me, as well as the Debian bug address and the > gstreamer-devel mailing list. Thanks for your understanding! -- http://www.inventati.org/frx/ 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 _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Bug#863663: libgstreamer1.0-0: plays MJPEG AVI files (and possibly other formats) at degraded quality
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Re: Bug#863663: libgstreamer1.0-0: plays MJPEG AVI files (and possibly other formats) at degraded quality
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On Tue, 05 Sep 2017 10:40:13 +0100 Tim-Philipp Müller wrote:
> On Mon, 2017-09-04 at 22:51 +0200, Francesco Poli wrote: > > > > [...] > > > > waiting for [bug 783267] to be fixed > > > > > > [...] > > > > > > > > [bug 783267]: <https://bugzilla.gnome.org/show_bug.cgi?id=783267> > > > > > > Is there any progress on this bug? > > > Please let me know: I am looking forward to seeing this issue fixed > > > once and for all... > > > > > > Thanks for your time! > > > > May I have a reply, please? > > Thanks for your understanding. > > The best way to stay informed of any progress on the bug is to > subscribe (CC yourself) to the bug in bugzilla, or simply check in on > it from time to time. The latest status is in bugzilla. progress has been documented there since 2017-06-15 ... > > Someone might have a look later this week. This would be highly appreciated! P.S.: Please keep the Debian bug address in Cc (I have just re-added it). Thanks! -- http://www.inventati.org/frx/ 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 _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Bug#863663: libgstreamer1.0-0: plays MJPEG AVI files (and possibly other formats) at degraded quality
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On Tue, 5 Sep 2017 23:16:57 +0200 Francesco Poli wrote:
> On Tue, 05 Sep 2017 10:40:13 +0100 Tim-Philipp Müller wrote: [...] > > > > Someone might have a look later this week. > > This would be highly appreciated! > Is there any progress (not documented on the bugzilla [bug 783267])? [bug 783267]: <https://bugzilla.gnome.org/show_bug.cgi?id=783267> > > P.S.: Please keep the Debian bug address in Cc. Thanks! -- http://www.inventati.org/frx/ 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 _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Bug#863663: libgstreamer1.0-0: plays MJPEG AVI files (and possibly other formats) at degraded quality
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On Fri, 22 Sep 2017 23:58:39 +0200 Francesco Poli wrote:
> On Tue, 5 Sep 2017 23:16:57 +0200 Francesco Poli wrote: > > > On Tue, 05 Sep 2017 10:40:13 +0100 Tim-Philipp Müller wrote: > [...] > > > > > > Someone might have a look later this week. > > > > This would be highly appreciated! > > > > Is there any progress (not documented on the bugzilla [bug 783267])? > > [bug 783267]: <https://bugzilla.gnome.org/show_bug.cgi?id=783267> Thanks for your time! > > > > > P.S.: Please keep the Debian bug address in Cc. Thanks! -- http://www.inventati.org/frx/ 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 _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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