4k preview freezing while decoding/rendering

[Marc Leeman]

1. adding 'sync=false' is rarely a good approach
2. it's best to have the rendering/saving in a different thread as the
decoding, add a queue for a sink.
3. I would recommend letting GStreamer have more autonomy in
constructing the pipelines, e.g. by using (uri)decodebin(3) and/or
autovideosink or even gst-play-1.0

On Wed, 28 May 2025 at 10:45, Manikandan Valaguru via gstreamer-devel
<gstreamer-devel at lists.freedesktop.org> wrote:
>
> Hi,
> We're currently using the following GStreamer pipeline to store 4K video from an RTSP stream:
> "gst-launch-1.0 -e rtspsrc latency=0 location=rtsp://192.168.1.13:5005/videodata ! rtph264depay ! h264parse ! mp4mux ! filesink location=file.mp4"
> The recorded video is then played back using the following pipeline:
> "gst-launch-1.0 filesrc location=videoplayback.mp4 ! qtdemux ! av1parse ! av1dec ! videoconvert ! xvimagesink sync=false "
> However, during playback, we are experiencing stuttering and occasional freezing in the video output. We've attached the video file that exhibits the issue for your reference.
>
> https://drive.google.com/drive/folders/1GvWKAHgY297onzoTD6ff0h17F_6aEWSM
> We suspect the problem might be related to decoding or rendering limitations, possibly due to incorrect pipeline elements or playback configuration. We're especially unsure about the use of av1parse and av1dec, given that the original stream is H.264 encoded.
> We would greatly appreciate your insights on:
>
> Whether the playback pipeline is appropriate for the saved file format.
> If any optimizations or changes can improve the smoothness of playback.
> Any known issues with hardware/software decoding of high-resolution streams.
>
> Thanks in advance for your help!
> Regards,
> Manikandan
>
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-- 
g. Marc

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