YouTube 1080p transcoding currently introduces artifacts (stair stepping/jaggies)!

[xcelpast]

What brand and model hi-hats are those?

[sepprohrmoser]

Sabian 13" HH Bright Hats (the good ones on the left)

Sabian 14" AA ??? have to replace them

[AsandoPottale]

1) Just to be sure: Are you 100% sure that it was not the camcorder that introduced the artifact? The Canon HF S10/100 has that problem, others, too.

2) Maybe, YouTube misinterprets a progressive video for an interlaced one and does bad processing on the video that you upload

3) I had a similar issue with a 720p video that I uploaded as h264/MP4 with insane bitrate.

4) I fixed my issue (3) by re-uploading the video as loss-less FLV1/AVI (see ffmpeg/ffdshow). Afterwards, the stairs were gone.

[sepprohrmoser]

1) Yes and you can check as well: Just look at my testuploads with 798 and 1076 lines - no jaggies there!

2) No - that would produce "combs"

4) Interesting!

[AsandoPottale]

..4) Typo. Actually, I meant FFV1/AVI :)

[Boleskinebeatz]

Well it looks great to me! I am suspicious of full scren modes as they all sem to do a type of scaling. FCP being the worst!

Full screen (EG Present Movie on screen) in Quicktime is fine if linked up to a full 1080P TV via HDMI .

what settings are you using to upload to you tube from the 5D?

[sepprohrmoser]

I render them out as H264 AVC MP4 with Sony Vegas - but the 1072p-Version looks better!

[lowlypawn]

WOW! The clarity is amazing for youtube.

[sepprohrmoser]

Thanks, check out the 2.35:1 widescreen-version - that looks even better.

They seem to use the same bitrate even with black borders....

[JBLanteigne]

This looks extremely good but in terms of 1080p, I've seen better.

I think AlphaHorizon's point is why it's not as good as 1080p

[sepprohrmoser]

No, it is actually delivered as 1080p!

But YouTube´s encoders have a bug that fucks up everything in 1920x1080p.

If you upload less than 1080 lines it works out fine!

This is why the cinema trailers look good.

Check out the video response above and you will see...

[sepprohrmoser]

This is a 1920x1080p30 MPEG4 AVC upload but there are strange jagged lines (snare, splash cymbal).

The sourcefile (20mbps) looks great - does anybody know where these artifacts come from?

Are even FullHD-vids erratically resized?

[AlphaHorizon]

It's not actually 1080P, it is encoded to 720P and fitted onto 1080P. Why youtube did this I do not know...it was a terrible idea.

[sepprohrmoser]

That´s nonsense!

I´ve downloaded the 1080p-version with a youtube-downloader and the file is indeed 1920x1080p30 @ 3,6 Mbit/s.

Somewhere in the transconding process YouTube has introduced artifacts that look like crappy scaling using nearest neigbour.

Of course scaling is not necessary because i´ve uploaded a native 1920x1080p30 file.