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Search: Posts Made By: benwaggoner
Forum: New and alternative video codecs 16th November 2021, 18:22
Replies: 83
Views: 40,487
Posted By benwaggoner
So true. Just like I worry about the global CO2...

So true. Just like I worry about the global CO2 impact of using AV1 SW decoders when a HW decoder is available, I imagine the net impact of doing lot of SW image decode could hurt device battery life...
Forum: New and alternative video codecs 24th June 2021, 17:57
Replies: 83
Views: 40,487
Posted By benwaggoner
Plus HEVC introduced intra-frame prediction, so...

Plus HEVC introduced intra-frame prediction, so you can actually have inter-predicted blocks on an IDR frame, referencing earlier parts of the same frame.

Sometimes I feel like we're walking...
Forum: New and alternative video codecs 22nd June 2021, 23:31
Replies: 83
Views: 40,487
Posted By benwaggoner
All too common a story. People with an...

All too common a story. People with an engineering background but not an image science background can get into the "I don't care if it looks bad in practice, it still looks good in theory!" trap...
Forum: New and alternative video codecs 22nd June 2021, 17:26
Replies: 83
Views: 40,487
Posted By benwaggoner
I don't know that it has been demonstrated that...

I don't know that it has been demonstrated that AV1 has the most efficient I-frame encoding to date, at least not psychovisually with still images. It might be true, but I'm not aware of any good...
Forum: New and alternative video codecs 21st June 2021, 22:32
Replies: 83
Views: 40,487
Posted By benwaggoner
I've not read the spec to this level, but that...

I've not read the spec to this level, but that looks like a maximum of two layers to me.
Forum: New and alternative video codecs 16th June 2021, 18:38
Replies: 83
Views: 40,487
Posted By benwaggoner
x265 is a specific HEVC encoder. Others are...

x265 is a specific HEVC encoder. Others are available and can be used with HEIC, although x265 is quite good at the still image use case. The HEIF wrapper can use H.264, JPEG, AV1 (AVIF is AV1 in...
Forum: New and alternative video codecs 15th June 2021, 17:44
Replies: 83
Views: 40,487
Posted By benwaggoner
DOH! Thanks for the catch and the fix!

DOH!

Thanks for the catch and the fix!
Forum: New and alternative video codecs 14th June 2021, 20:32
Replies: 83
Views: 40,487
Posted By benwaggoner
Great insight there. A great thing about...

Great insight there.

A great thing about using HEIC is that its lossless mode is quite efficient; a lot better than PNG or lossless JPEG and better than J2K.

There is also the option of mixing...
Forum: New and alternative video codecs 14th June 2021, 18:50
Replies: 83
Views: 40,487
Posted By benwaggoner
The AVIF container is HEIF. The HEVC HEIF (HEIC)...

The AVIF container is HEIF. The HEVC HEIF (HEIC) already supports lossless, as HEVC supports lossless in all profiles. And it also supports alpha channels...
Forum: New and alternative video codecs 14th June 2021, 02:56
Replies: 83
Views: 40,487
Posted By benwaggoner
AVIF is the AV1-derived image format. It's an...

AVIF is the AV1-derived image format. It's an AVIF I-frame in a HEIF wrapper.

I've not compared AVIF to WebP2. The stock aomenc AV1 encoder isn't particularly psychovisually optimized, let alone...
Forum: New and alternative video codecs 10th December 2020, 18:35
Replies: 83
Views: 40,487
Posted By benwaggoner
For file size optimized JPEG, 4:2:0 is the name...

For file size optimized JPEG, 4:2:0 is the name of the game. JPEG does 4:4:4 at higher "quality" settings by default.

With some handwaving, 4:2:0 is theoretically twice as fast as 4:4:4 as there...
Forum: New and alternative video codecs 10th December 2020, 02:02
Replies: 83
Views: 40,487
Posted By benwaggoner
Well, 4:2:0 is only 50% the bits per pixel as...

Well, 4:2:0 is only 50% the bits per pixel as 4:4:4, so will decode faster. And YUV is generally more efficient than RGB, even in 4:4:4. If I was optimizing for low bitrates and/or SW decode perf,...
Forum: New and alternative video codecs 8th December 2020, 22:48
Replies: 83
Views: 40,487
Posted By benwaggoner
And >8-bit would also make native HDR photography...

And >8-bit would also make native HDR photography feasible. Today it's a lot easier to convert HDR/RAW photography to a very low fps HEVC .mp4 using PQ Rec. 2020 and play it back on a HDR TV than it...
Forum: New and alternative video codecs 5th December 2020, 01:08
Replies: 83
Views: 40,487
Posted By benwaggoner
Very cool!

Very cool!
Forum: New and alternative video codecs 23rd November 2020, 21:33
Replies: 83
Views: 40,487
Posted By benwaggoner
So, this is an enhanced encoder for the VP8...

So, this is an enhanced encoder for the VP8 "WebP" format?

Do we care about WebP? I've not really seen exciting real-world implementations that were enough better than JPEG to merit the extra...
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