Can you find key frame in h264 video without decoding?

Michael Gruner michael.gruner at
Mon May 30 19:47:58 UTC 2022

The h264parse will set the DELTA_UNIT flag based on the NAL units. <>

> On 30 May 2022, at 12:52, John McDermott via gstreamer-devel <gstreamer-devel at> wrote:
> Hi
> Does anyone know if key frames can be found without decoding? In the context of the pipeline rtspsrc->rtph264depay->h264parse->appsink, which element sets the GST_BUFFER_FLAG_DELTA_UNIT flag? I read that a keyframe has a unique start code in the NAL unit. In that case, does that mean rtph264depay sets the flag?
> Thanks

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