Gstreamer and vdpau
Jérémy Lauraire
jeremy.lauraire at gmail.com
Fri Jul 1 00:44:44 PDT 2011
Hi Arnaud,
I am actually working on a similar application... the purpose is to build a
video server that accelerate the decoding phase by taking advantage of
GP-GPU capabilities.
My question is : do you integrate your code in the context of the
appsrc-stream.c example?
I'll try your code and tell you more if I can... There is no
"audiConverter", right? Have you try your C application with a first step
example : no Ranking just as your command line example?
" //Sanity check on elements validity
if(!playbin || !vdpauSink || !alsaSink || *!audioConverter??* ||
!vdpauVideoPostProcess || !videoOutputBin)
{
....
}
"
Regards.
Jérémy.
_____________
2011/6/30 arnaud tonda <arnaud.tonda at gmail.com>
> Hi everybody,
>
> i have started the development of a multimedia player based on gstreamer
> pipelines and i encounter some problems.
>
> i work on a debian platform using Nvidia drivers, and so vdpau.
>
> after reading the documentations on the gstreamer mechanisms and the
> different example codes, i have started to make pipelines using gst-launch,
> and then i have written some C source code.
>
> i don't know if it's the better way, but i use the playbin2 element, with
> setting video-sink property to a "vdpau sink" pipeline.
>
> in commandLine, i use this :
>
> gst-launch-0.10 -v -m playbin2 uri=file:///Movies/test.mkv
> video-sink="vdpauvideopostprocess ! vdpausink" audio-sink="alsasink"
>
> this works fine, except that i can't set the Rank of the vdpau decoder, and
> so it hangs...
>
> i tried to make the same in C source code, and the results are not
> convincing... a piece of my code is below :
>
>
> /*************************************************************************************************************************/
> int main (int argc, char *argv[])
> {
> /***************************/
> /*Variables Declaration*/
> /***************************/
>
> //GStreamer main event loop
> GMainLoop *loop;
>
> //elementary elements
> GstElement *playbin;
> GstElement *videoOutputBin;
>
> //VideoSink elements for VDPau;
> GstElement *vdpauSink;
> GstElement *vdpauVideoPostProcess;
>
> //AudioSink elements for Alsa;
> GstElement *alsaSink;
>
> //Gstreamer bus to communicate with elements
> GstBus *bus;
>
> //pad for videoOutputBin
> GstPad *vdpauBinPad;
>
> /********************/
> /*Real code start*/
> /********************/
> //Gstreamer initialisation
> gst_init(&argc, &argv);
> loop = g_main_loop_new(NULL, FALSE);
>
> //Sanity check on parameters
> if(argc != 2)
> {
> g_printerr ("Usage: %s <Multimedia filename>\n", argv[0]);
> return -1;
> }
> //elements initialisation
> videoOutputBin = gst_bin_new("vdpau-output-chain");
> playbin = gst_element_factory_make("playbin2","play-bin");
> vdpauSink =
> gst_element_factory_make("vdpausink","vdpau-sink");
> vdpauVideoPostProcess =
> gst_element_factory_make("vdpauvideopostprocess","post-process");
> alsaSink =
> gst_element_factory_make("alsasink","alsa-sink");
>
> //Sanity check on elements validity
> if(!playbin || !vdpauSink || !alsaSink || !audioConverter
> ||!vdpauVideoPostProcess || !videoOutputBin)
> {
> g_printerr("Some gstreamer elements could'nt itialized exit\n");
> return -1;
> }
>
> //set up the pipeline
> //1 - We set the URI input filename to the fileSource element
> g_object_set(G_OBJECT(playbin),"uri",argv[1],NULL);
> //2 - We add a message Handler
> bus = gst_pipeline_get_bus (GST_PIPELINE(playbin));
> gst_bus_add_watch(bus, bus_callback, loop);
> gst_object_unref(bus);
>
>
> //3 - define specific rank for VDpau decoders
> GstElementFactory *vdpauh264dec = gst_element_factory_find("vdpauh264dec");
> gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE(vdpauh264dec),
> GST_RANK_PRIMARY+2);
> GstElementFactory *vdpaumpeg4dec =
> gst_element_factory_find("vdpaumpeg4dec");
> gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE(vdpaumpeg4dec),
> GST_RANK_PRIMARY+2);
> GstElementFactory *vdpaumpegdec = gst_element_factory_find("vdpaumpegdec");
> gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE(vdpaumpegdec),
> GST_RANK_PRIMARY+2);
>
> //4 - create the videoOutputBin
> g_signal_connect (G_OBJECT(videoOutputBin), "pad-added", G_CALLBACK
> (on_pad_added), NULL);
> g_signal_connect (G_OBJECT(videoOutputBin), "pad-removed", G_CALLBACK
> (on_pad_removed), NULL);
>
> gst_bin_add_many(GST_BIN(videoOutputBin),vdpauVideoPostProcess,vdpauSink,
> NULL);
>
> gst_element_link(vdpauVideoPostProcess,vdpauSink);
>
>
> vdpauBinPad =
> gst_ghost_pad_new("sink",gst_element_get_static_pad(vdpauVideoPostProcess,"sink"));
>
> if(!vdpauBinPad)
> {
> g_printerr("vdpauBinPad is null\n");
> exit -1;
> }
> else
> {
> g_print("vpaudBinPad Exist\n");
> gst_element_add_pad(videoOutputBin,vdpauBinPad);
> }
>
> //4 - set playbin properties
>
> g_object_set(G_OBJECT(playbin),"video-sink",videoOutputBin,"audio-sink",alsaSink,NULL);
>
>
> /* Set the pipeline to "playing" state*/
> g_print ("Now playing: %s\n", argv[1]);
> gst_element_set_state (playbin, GST_STATE_PLAYING);
>
> /* Iterate */
> g_print ("Running...\n");
> g_timeout_add (200, (GSourceFunc) cb_print_position, playbin);
> g_main_loop_run (loop);
>
>
> /* Out of the main loop, clean up nicely */
> g_print ("Returned, stopping playback\n");
> gst_element_set_state (playbin, GST_STATE_NULL);
>
> g_print ("Deleting pipeline\n");
> gst_object_unref (GST_OBJECT (playbin));
>
>
> return 0;
> }
>
> /*************************************************************************************************************************/
>
> As you can see, i have made a GstBin to encapsulate the post process
> element, and the vdpauSink, and created a ghost pad to
> vdpauvideopostprocess.
>
> but i don't know if it is the right way to do this, because on certain
> streams, video is displayed, but in other cases, gstreamer pipeline hang...
> and when it hangs, in the gstreamer debug traces, i have a lot of warnings,
> and some errors like this :
>
> 0:00:04.675157784 669 0x8783ff0 ERROR h264dpb
> h264/gsth264dpb.c:145:gst_h264_dpb_add:<GstH264DPB at 0x8659ea8> Couldn't
> make room in DPB
> 0:00:04.696232757 669 0x8783ff0 WARN basetransform
> gstbasetransform.c:1065:gst_base_transform_acceptcaps_default:<passthrough-identity>
> transform could not transform video/x-vdpau-video, chroma-type=(int)0,
> width=(int)1920, height=(int)1080, framerate=(fraction)1710843747/71356439,
> pixel-aspect-ratio=(fraction)1/1, interlaced=(boolean)false in anything we
> support
> 0:00:04.729182133 669 0x8783ff0 WARN basetransform
> gstbasetransform.c:1065:gst_base_transform_acceptcaps_default:<passthrough-identity>
> transform could not transform video/x-vdpau-video, chroma-type=(int)0,
> width=(int)1920, height=(int)1080, framerate=(fraction)1710843747/71356439,
> pixel-aspect-ratio=(fraction)1/1, interlaced=(boolean)false in anything we
> support
> 0:00:04.729352573 669 0x8783ff0 ERROR h264dpb
> h264/gsth264dpb.c:145:gst_h264_dpb_add:<GstH264DPB at 0x8659ea8> Couldn't
> make room in DPB
> 0:00:04.749110902 669 0x8783ff0 WARN basetransform
> gstbasetransform.c:1065:gst_base_transform_acceptcaps_default:<passthrough-identity>
> transform could not transform video/x-vdpau-video, chroma-type=(int)0,
> width=(int)1920, height=(int)1080, framerate=(fraction)1710843747/71356439,
> pixel-aspect-ratio=(fraction)1/1, interlaced=(boolean)false in anything we
> support
>
> As it works in commandLine, i think i have made some errors, but i don't
> see them right now.
>
> if necessary i can take you some more informations.
>
> Best regards
>
> --
> Arnaud Tonda
>
>
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>
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