Hi,
I have a GStreamer pipeline with an appsink:
filesrc location=test.mp4 ! decodebin ! video/x-raw ! queue max-size-bytes=0 max-size-time=100000000 ! appsink name=appSink sync=false max-buffers=1 drop=false
I pull a sample from the appsink then I get the buffer, map it read-only and store the map info (to access raw memory later):
sample: Gst.Sample = self.__sink.pull_sample()
self.__buffer: Gst.Buffer = sample.get_buffer()
self.__buffer_map: Gst.MapInfo = self.__buffer.map(Gst.MapFlags.READ)
Then I would like to use the same data (without copying it) in an output pipeline for e.g.:
appsrc name=appSrc block=true ! video/x-raw,format=(string)NV12,width=1920,height=1080,framerate=30/1 ! videoconvert ! ximagesink
To do this it is the best I could come up with:
shared_buffer_memory = self.__buffer.get_all_memory()
buf = Gst.Buffer.new()
buf.insert_memory(-1, shared_buffer_memory)
self.__src.push_buffer(buf)
If I do this I see the first frame correctly but all the other frames
are green. It is fine, because the underlying memory of buf goes out of
scope and freed meanwhile. If I put sleep(0.05) after push_buffer it
displays all of the frames, but I think the memory behind the buffer is
double-freed:
** (python3.9:6745): CRITICAL **: 09:23:54.645: gst_vaapi_image_unmap: assertion 'image != NULL' failed
I would like to get the frames from the appsink then push them into
output pipelines without copy. What would be the best approach to do
this? (a single pipeline is not suitable in my case)
Kind regards,
Adam
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