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Currently, when rtspsrc property add-reference-timestamp-metadata=true, a downstream rtph264depay element will attach multiple copies of the same GstReferenceTimestampMeta to the depayloaded media buffers. This can have signficant performance impacts further downstream in a pipeline like the following: rtspsrc add-reference-timestamp-metadata=true ! rtph264depay ! h264parse ! ... ! rtph264pay ! ... For example, if there are 10 packet buffers for a frame of RTP H.264 video, each of those packet buffers will contain the same reference timestamp meta. The rtph264depay element will then attach all 10 metadata to the depayloaded frame. And then later when we payload the frame buffer again for proxying, we now have 10 more buffers each with 10 instance of the same metadata. Allocating/deallocating 100+ instances of metadata @ 30fps for multiple streams has a pretty large performance impact. Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1578 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3431> |
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