Getting noises in exported file

Forum|Forum|6 years ago
April 25, 2019
2 replies
4871 views

I'm facing a problem exporting 4k timeline to h264 "matching source high bitrate".

I'm getting noises in some frames.

After several trials of different h264 settings i found the "match source adaptive high bitrate" to solve the problem. but it comes with a heavy penalty - the size of the file is 6 time bigger!!!

Any idea?

Thanks

Arikw

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Averdahl

Community Expert

You need a higher bitrate than 10 for good results for 4K. Besides the problem you uploaded, take a look at the boat and the loss of details and the amount of macro blocking. Try H.265 to use lower bitrates.

4K=big video files.

A

arikwAuthor

Inspiring

Both files are 4k!!!

The first one - "h 264 match source high br" - comes out smaller than an mpeg 1920*1080!

Uptill now with very good results! no noise! (anything to do with the new version?)

Following your advice I was trying to lower the BR but less than 63.3 BR (which is the adaptive setting) 50 BR the noise remain!

I was trying also facebook, vimeo, youtube 4k ultra hd settings and h 264 high quality 4k but the noise is still there.

Any other idea?

A

arikwAuthor

Inspiring

That clip is indeed tricky to encode, lots of waves in the water, moving camera, lot´s of sun reflections in the water. With the clip i get the very same results as you when using "Match Source - High Bitrate". The only way to get rid of it is to use a higher bitrate if you need/want H.264.

4K is four times larger than 1920x1080 so it requires a higher bitrate. When i do Blu-ray´s i often encode using CBR and 30 Mbps for 1920x1080. If i use 30 Mbps x 4, iow 120 Mbps for this clip it comes out great but i do realize that the file size is big.

I did a test and exported the clip as GoPro CineForm and uploaded that to YouTube and the 4K version looked good.

Use H.265 instead of H.264. You can use a lower bitrate and has many more options and still get the .mp4 container. But H.265 at 10 Mpbs will look bad as well, so higher bitrate is needed for 4K.

I'm defiantly going to look into the options you mentioned.

Did you try the Pegasys plugin you advised me about? (which the trial version doesn't work for me)

Thanks again for all your efforts.