Youtube AVC better than VP9?

[y_a22264327]

Hi!

I tried everything I could to export a video (hd1080, 25fps) from adobe premiere to youtube in high quality, and the overall quality is good BUT I still have a big problem only with some animations that appear and disappear very quickly : when they appear the quality becomes horrible (very pixelated and blurry)

In fact, with the Aac youtube format, the quality is OK. Then youtube switch to Vp9, which is supposed to be a better quality, but on these fast animations it's clearly much worse than with the Aac codec.

I tried to export and upload in "4K", and the quality is perfect in 4K, but when played in Hd1080 it becomes horrible again when the fast animations appear.

I tried also various formats (quicktime H264, uncompressed yuv10, H264, DNxHD etc) and various bitrates but it's still not ok.

I would like to block youtube in Aac mode but it seems to be out of control (?).

Only few people will activate the 4K in youtube so it's not a good option either.

Thank you for you help..!

[Baobaob]

What are you talking about exactly when you say "AAC codec" ? You know AAC is a sound codec not video, right ?! Adjusting this wouldn't affect video quality.

What's the highest bitrate you've tried when doing H264 so far ?

[y_a22264327]

Thanks for your reply and Sorry, I mean AVC codec

For the bitrates I tried variable bitrates, 2 pass :  8-10, 15-20, 25-40, 60, and 40-300 (only for the 4k test export)

[R Neil Haugen]

Try a Cineform or DNxHD/R or if on Mac, ProRes. And skip the 2-pass.

Neil

[y_a22264327]

Thanks Neil! I'm on PC and I already tried cineform but with this one adobe media encore doesnt give the option to select 1 or 2-pass...

[y_a22264327]

Could the sound be a problem ..? (44.1 - 24bits, looking for the best audio quality).

[Baobaob]

My opinion is that sound couldn't be the problem, but I would agree that finding a codec where the settings  allow you to select only 1 pass instead of 2, as Neil suggested, is an interesting option to explore.

[y_a22264327]

Thanks Baobaob...Unfortunately the problem is still here when I select only 1 pass.

That's really strange!

Do you think I can hire a specialist somewhere online to achieve this correctly..?

[Jim_Simon]

AAC is an audio codec.  It would have nothing to do with the issue you're facing.

Choose QuickTime as the Format and GoPro Cineform YUV 10-bit as the Preset.  That will give you the best quality for YouTube to convert.

Make sure you give YT some time to do the job.  The first conversion that appears is 360.  Other higher quality conversions will appear after some time.

If the conversion is still not very good the day after uploading, there's nothing else you can do.

[y_a22264327]

Thanks Jim!

I made a mistake (I mean AVC and not AAC, but It seems that I can't edit my first post..?)

Anyway,

- I already uploaded a GoPro Cineform YUV 10-bit export

- It looks good

- Then youtube switch from their AVC codec to their VP9 codec (which is normally

the best of the two) and some frames become horrible even in hd1080

- A 4K version look perfect but is also horrible on some frames when seen in hd1080

[Jim_Simon]

You can't control YT's conversion.

[y_a22264327]

And would it be a way to block the switch from avc to vp9?

[Jim_Simon]

On your end, no.  There are add-ons for Firefox that can force H.264 playback.

[Baobaob]

I support the theory that youtube's compression is at fault there.
On the other hand, youtube is lame at respecting the creator's video quality, why not use Vimeo ?