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Adobe Media Encoder creates frame blending issues when using H.265 but works fine with H.264

Contributor ,
Oct 19, 2020 Oct 19, 2020

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I just noticed when encoding a 23.976 video in Adobe Media Encoder using H.265 HEVC (Match Source High Bitrate preset), the resulting video has extra blended frames. If I export the encode using H.264 AVC (Match Source High Bitrate preset) it looks normal. Here's the comparison:

H265.png

Above is a screenshot of the the H.265 version that Media Encoed messed up.

H264.png

And above is a screenshot of the H.264 version that encoded properly.

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Community Expert ,
Oct 19, 2020 Oct 19, 2020

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so you've adjusted the speed on this clip?  You might try optical flow and see if that helps.  Also, you could try smart rendering:  change your preview format in your sequence settings to a high quality all i frame format like prores 422hq, render your entire sequence (or at least your problematic clips in the timeline) and then when exporting, make sure "use previews" is checked. 

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Contributor ,
Oct 22, 2020 Oct 22, 2020

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Thanks for the reply but maybe you misunderstook the question... it works fine with H.264 so why wouldn't H.265 work?

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Community Expert ,
Oct 22, 2020 Oct 22, 2020

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the way 265 compresses and decompresses the frames is different from the way 264 does.   Certainly worth a quick test if Carlos' suggestion doesn't solve the problem.

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Community Expert ,
Oct 22, 2020 Oct 22, 2020

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also, you might try smart rendering.  setting your preview format in your sequence settings to a high quality all-iframe format like prores 422 hq, render the problematic clips and if they playback fine from the timeline, when you export "use previews."

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Community Expert ,
Oct 19, 2020 Oct 19, 2020

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try to switch renderers inside Media Encoder

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New Here ,
Dec 14, 2022 Dec 14, 2022

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In Adobe media encoder, you can choose if you're going to use frame blending or frame sampling. h.264 has frame sampling as default, and HEVC has frame blending as default.

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Community Expert ,
Dec 14, 2022 Dec 14, 2022

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but unless I'm wrong (it happens), if you're exporting with the same frame rate as your camera original and sequence, there shouldn't be any frame blending or frame sampling... Each frame is discreet...   If I'm wrong or have missed something in the thread, let me know...

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