[FFmpeg-user] Why was patch declined: Modified force_key_frames option to accept frame numbers?

Nick vincent at systemli.org
Sun Feb 17 03:41:37 EET 2019

On 2/17/19 2:37 AM, Nick wrote:
>>>> I think scene cut detection is different using different resolutions.
>>>> If I turn off the detection I can align the segmentation using key_frames.
>> I calculated the I-Frame positions from a already segmented video with a
>> different resolution.
>> When I disabled scenedetection and placed them manually while encoding
>> using force_key_frame it worked!
>> BUT, I miss 8 I-Frames because they are not packed into seperate chunks.
>> If I now insert all I-Frames (obtained from the video with different
>> resolution), the alignment is displaced again. :(
>> Is there a way to select the I-Frame where the video gets split into chunks?
>> Is there a limit for the minimum filesize for a chunk?
>> Can I split on each I-frame?
>> So obtain +8 video chunks?
>> Thanks for your help. :)
> If I manually place the I-frames in the video with the "different
> resolution" I get the different alignment too...
> So both are aligned again. :)
And if I extract the I-Frames again, I get the same positions as in the
original video.

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