Hi,
From your attachment implementation.c, found
vaapiencoder = gst_element_factory_make ("x264enc", NULL);
Maybe typo. Suppose you want “vaapiencode_h264”. Anyway, I just tried
$ gst-launch-1.0 videotestsrc !
video/x-raw,format=NV12,width=320,height=240,framerate=30/1 ! vaapipostproc !
queue ! vaapiencode_h264 ! fakesink
Failed in latest master branch. This issue caused by gstvaapiencoder need
strict format check but vaapipostproc with format ‘Encoded’(VASurface). After
adding a specific ‘format’ for vaapipostproc, encoder works. You can take a try
.
$ gst-launch-1.0 videotestsrc !
video/x-raw,format=NV12,width=320,height=240,framerate=30/1 ! vaapipostproc
format=nv12 ! queue ! vaapiencode_h264 ! fakesink
Thanks,
Wind
From: Libva [mailto:[email protected]] On Behalf Of Engin
Firat
Sent: Friday, December 12, 2014 11:48 PM
To: [email protected]
Subject: [Libva] Problem with vaapipostproc element
Hello,
I have a problem related to element called vaapipostproc. The problem is as
follows:
I have a pipeline and for specified time intervals I attempt to change pipeline
dynamically in order to change write location of the filesink. I have
implemented this functionality and everything works well in case I do not use
vaapipostproc element. If I use vaapipostproc element, the pipeline crashes
unexpectedly. An error message is thrown from the element vaapipostproc:
"failed to create output video buffer" at the immediate point the pipeline is
changed dynamically.
My pipeline change strategy is as follows:
0. Create a bin and place mux and filesink elements inside it. Moreover create
a queue element before this bin.
1. For specified intervals, fire a clock event and catch it in a handler
2. In clock handler place a blocking probe to queue's source pad and register a
blocking data handler
3. In blocking data handler unlink queue and bin and send an EOS event to bin's
sink pad.
4. Handle EOS event on bin element. In this handler, destroy bin, create a new
bin with an updated filesink location connect bin with queue. And remove the
blocking probe.
This strategy for dynamic pipeline changing works well when I do not use
vaapipostproc element. But I want to do encoding process on GPU and using
vaapipostproc is a mandatory.
I have inspected the source code gstvaapipostproc.c for element vaapipostproc
and It seem the problem is related to function named as GstBuffer *
create_output_buffer(GstVaapiPostproc*).
You can find output messages when GST_DEBUG environment variable is set to 4.
In addition to this, you can also find my implementation to change the pipeline
dynamically. The implementation won't compile, I just want to share a
pseudo-code for your well understanding of the implementation.
I want to share the most interesting part of the out.log file:
0:00:11.075920072 [334m11325 [00m 0x1dcc720 [36mINFO [00m [00m
vaapipostproc
gstvaapipluginbase.c:532:gst_vaapi_plugin_base_decide_allocation:<GPUPostProcessing>
[00m no pool or doesn't support GstVaapiVideoMeta, making new pool
0:00:11.076231088 [334m11325 [00m 0x1dcc720 [36mINFO [00m [00m
vaapivideomemory gstvaapivideomemory.c:627:gst_vaapi_video_allocator_new: [00m
has direct-rendering for NV12 surfaces: no
0:00:11.076568949 [334m11325 [00m 0x1dcc720 [31;01mERROR [00m [00m
vaapipostproc gstvaapipostproc.c:412:create_output_buffer: [00m failed to
create output video buffer
0:00:11.076723161 [334m11325 [00m 0x1dcc720 [33;01mWARN [00m [00m
basetransform
gstbasetransform.c:2130:gst_base_transform_handle_buffer:<GPUPostProcessing>
[00m could not get buffer from pool: error
0:00:11.076773273 [334m11325 [00m 0x1dcc720 [36mINFO [00m [00m
task gsttask.c:300:gst_task_func:<queue0:src> [00m Task going to paused
How can I solve this problem? Any help will be appreciated.
Regards.
Engin FIRAT
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