Working with locally built GStreamer
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Working with locally built GStreamer
 
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Hi,
I need to do a bisect between GStreamer 1.16.3 and 1.18.0 to find the point at which the GStreamer code breaks Me TV – which worked fine under 1.16.3 and fails to stream audio or video under 1.18.0. I found the following: https://gstreamer.freedesktop.org/documentation/installing/building-from-source-using-meson.html?gi-language=c However: |> ninja -C ~/BuildArea/GST_Build_1.16 devenv ninja: Entering directory `/home/users/russel/BuildArea/GST_Build_1.16' ninja: error: unknown target 'devenv' Is there an official correct set of instructions for noobies and newbies that can lead me to be able to create a GStreamer 1.16.3, 1.18.0 and all commits in between so as to find out where GStreamer broke? -- Russel. =========================================== Dr Russel Winder t: +44 20 7585 2200 41 Buckmaster Road m: +44 7770 465 077 London SW11 1EN, UK w: www.russel.org.uk _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Working with locally built GStreamer
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Re: Working with locally built GStreamer
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On Sat, 2020-10-17 at 14:14 -0300, Thibault Saunier wrote:
> Hello, > > We changed the name of the target from 'uninstalled' to 'devenv' in the > 1.18 cycle. The instruction for 1.16 will be in the Readme of the 1.16 > branch. > Aha, hence the "conflict" between the "uninstalled" in the section title and the "devenv" in the command. I think I now have a full 1.16.2 build working as it should – except that deinterlacing of the video stream is not working as it was with GStreamer 1.16.2 installed in Sid :-( I shall have to sort this out before I can really do the git bisect. But at least I now have a start. Thanks for pushing me in the right direction, much appreciated. -- Russel. =========================================== Dr Russel Winder t: +44 20 7585 2200 41 Buckmaster Road m: +44 7770 465 077 London SW11 1EN, UK w: www.russel.org.uk _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Deinterlacing problem (was Re: Working with locally built GStreamer)
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Re: Deinterlacing problem
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Tony,
By dumping the pipeline, it appears that if the VA-API plugins are available in the bad plugins then some VA-API stuff gets used instead of what I had assumed would be used. The GstURIDecodeBin manages to use a GstVaapiDecodeBin which does some deinterlacing, elements that are not used if the VA-API stuff is not present. Obvious solution, remove all the VA-API stuff, but is this the right solution? On Fri, 2020-10-23 at 15:53 +0100, Tony Houghton wrote: > On Sun, 18 Oct 2020 at 16:56, Russel Winder <[hidden email]> wrote: > > > I think I now have a full 1.16.2 build working as it should – except that > > deinterlacing of the video stream is not working as it was with GStreamer > > 1.16.2 installed in Sid :-( I shall have to sort this out before I can > > really > > do the git bisect. But at least I now have a start. > > > > Could that be related to this issue > <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/607>;? > > _______________________________________________ > gstreamer-devel mailing list > [hidden email] > https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel =========================================== Dr Russel Winder t: +44 20 7585 2200 41 Buckmaster Road m: +44 7770 465 077 London SW11 1EN, UK w: www.russel.org.uk _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Deinterlacing problem
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Re: Deinterlacing problem
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On Fri, 2020-10-23 at 17:41 +0100, Tony Houghton wrote:
> VA-API probably has negligible benefit for SD MPEG 2 on a modern CPU, but > you should try to use it for HDTV. Are you saying that the deinterlacing > problems are caused by VA-API? What are the symptoms? Does gstreamer-vaapi > let you control the deinterlacing mode? If all of its modes are > problematic, perhaps it can be set to off and you can insert a separate > deinterlacer element. Without the VA-API available the GstDecodeBin uses a avdec_mpeg2video element. Then there is a GstDeinterlace element further down the pipeline that does the deinterlacing. With the VA-API the GstDecodeBin uses a GstVaapiDecodeBin instead of a avdec_mpeg2video element which then includes a GstVaapiPostproc that seems to do deinterlacing except that it does it all wrong. The GstDeinterlacing element is still in the pipeline but seems to have nothing to do since the input is progressive. I do some pipeline manipulation to deal with OpenGL as it is important to do deinterlacing in the OpenGL memory. It seems as though I may have to do something similar if using VA-API. > Also, I noticed that although gstreamer-vaapi gives high ranks to its > decoders to override software mode, it doesn't promote its sink, so if > you're using something like playbin or autovideosink it will probably use > something like xvimagesink. You might want to try making sure it's using > vaapisink or opengl. Both non-OpenGL/nonVA-API and VA-API pipelines use a GstPlaySinkVideoConvert feeding into a GstGtkSink. I have attached PDF files of the two pipelines. -- Russel. =========================================== Dr Russel Winder t: +44 20 7585 2200 41 Buckmaster Road m: +44 7770 465 077 London SW11 1EN, UK w: www.russel.org.uk _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel  pipeline_BBC_NEWS_build_vaapi_1.16.pdf (57K) Download Attachment pipeline_BBC_NEWS_build_1.16.pdf (54K) Download Attachment signature.asc (849 bytes) Download Attachment |
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