Thumbnail for every keyframe in video, fast

[matzewagner]

I am trying to generate images for every nth keyframe in a video file, as fast as possible. I have considered using multifilesink iterating over every frame and detecting keyframes via GST_BUFFER_FLAG_DELTA_UNIT, but this seems slow and performance is key. I have also looked at using the videorate plugin or seeking, but I don’t know how to ensure that we actually land on a keyframe. Are there any other approaches that GStreamer would lend itself to for this kind of task?

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[Thiago Sousa Santos-2]

On Wed, Dec 12, 2018 at 9:41 AM Matthias Wagner <[hidden email]> wrote:

I am trying to generate images for every nth keyframe in a video file, as fast as possible. I have considered using multifilesink iterating over every frame and detecting keyframes via GST_BUFFER_FLAG_DELTA_UNIT, but this seems slow and performance is key. I have also looked at using the videorate plugin or seeking, but I don’t know how to ensure that we actually land on a keyframe. Are there any other approaches that GStreamer would lend itself to for this kind of task?

Did you check the trickmode for keyframes? Check it at https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstEvent.html#GST-SEEK-FLAG-TRICKMODE-KEY-UNITS:CAPS

This flag should make elements only decode/output keyframes.

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