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Old 3rd December 2018, 23:59   #1  |  Link
madloggan
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Join Date: Aug 2018
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Comparing Two Frames

I'm trying to compare two pictures from compressed videos with avc,hevc,vp9,av1

how I can make sure all picture is keyframe? because I can't, maybe one b frame and the other I frame right? Is this something to do with references frames, open GOP, Max intra period in frames, Minimum GOP size, scene cut, golden frame, Periodic Intra Refresh?
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Old 4th December 2018, 10:58   #2  |  Link
Sharc
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Quote:
Originally Posted by madloggan View Post
I'm trying to compare two pictures from compressed videos with avc,hevc,vp9,av1

how I can make sure all picture is keyframe? because I can't, maybe one b frame and the other I frame right? Is this something to do with references frames, open GOP, Max intra period in frames, Minimum GOP size, scene cut, golden frame, Periodic Intra Refresh?
I am not sure what you are trying to achieve, but first of, for comparing encoder quality you have normally to make sure that the video file sizes of the different encodes (AVC, hevc, etc.) are the same (means equal compression strength). Otherwise the comparison is meaningless as you wouldn't compare apples with apples.
And keep in mind that a comparison based on some single frames does not tell too much about the perceived real-time playback experience. It can even be misleading.
For frame-by-frame comparison I would suggest to interleave the clips and step through the interleaved frames on the PC. I am however not sure at the moment whether avisynth interleaving supports different formats and color spaces .….... you will probably have to convert the clips to the same colorspace and same resolution for interleaving.

Last edited by Sharc; 4th December 2018 at 11:44.
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