Can you find key frame in h264 video without decoding?

[Michael Gruner]

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

https://github.com/GStreamer/gst-plugins-bad/blob/ca8068c6d793d7aaa6f2e2cc6324fdedfe2f33fa/gst/videoparsers/gsth264parse.c#L2659 <https://github.com/GStreamer/gst-plugins-bad/blob/ca8068c6d793d7aaa6f2e2cc6324fdedfe2f33fa/gst/videoparsers/gsth264parse.c#L2659>

> On 30 May 2022, at 12:52, John McDermott via gstreamer-devel <gstreamer-devel at lists.freedesktop.org> 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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