Commits on Sep 11, 2024

1. driver/usbvideodriver: reduce latency of GStreamer pipeline …

   The playbin3 uses a urisourcebin to open and read the uri. The
   urisourcebin detects the fd as a stream uri and internally crates a
   multiqueue with a default buffer duration of 5 s and a high watermark of
   0.60 to buffer the stream. This adds 3 s latency to the video stream.
   
   If the source signals that is it a live source, the urisourcebin would
   avoid buffering of the stream. Unfortunately, the fdsrc doesn't signal
   that the data is live, and doesn't have a property to change this.
   
   Use buffer-duration to set the size of the queue for buffering to 0 to
   avoid this additional latency.
   
   The queue could be completely removed by setting "buffering" in the
   flags property of playbin3 to 0, which would be equal to the behavior of
   a live source, but the changed flags are more difficult to understand
   than the buffer duration.

   

   tretter committed Sep 11, 2024
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