michaelni changed the topic of #ffmpeg-devel to: Welcome to the FFmpeg development channel | Questions about using FFmpeg or developing with libav* libs should be asked in #ffmpeg | This channel is publicly logged | FFmpeg 7.1 has been released! | Please read ffmpeg.org/developer.html#Code-of-conduct
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<BtbN>
It's very odd. There is no mention of git.videolan.org _anywhere_ I can see
<BtbN>
No idea where it pulls that from
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<Lynne>
IndecisiveTurtle: he has a blog
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<IndecisiveTurtle>
I did read the prores history article from it, was quite interesting (curious what he refers to as jbmpeg in some parts that has ffmpeg like paths). But I didnt find any email in it, so maybe comment in that article and hope he replies?
<IndecisiveTurtle>
Better ask in case he would be here or someone knew a more directy way to reach out probably
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<Lynne>
you know how when you turn on a TV to a channel you rarely watch at some odd funny time no one watches TV and there's a single guy with a camera decrying everything as a conspiracy?
<Lynne>
yeah, that's him
<Lynne>
we've got a few of those actually
* IndecisiveTurtle
puts on the tinfoil hat
<BtbN>
hm, I give up. I seriously do not understand where trac pulls the gitweb url to videolan from
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<Marth64>
BtbN: first instinct is its faster
<Marth64>
Any dns sorcery or hardcoded entries in /etc/hosts?
<Marth64>
(re: url issue)
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<kurosu>
The Vulkan VC2 encoder sounds about 5x faster than on CPU (obviously threading, and GPU vs CPU can play a role)
<kurosu>
but that means the entropy coding (I noted there is a... "shader"? for it) is also faster? I'd thought this would be the place where the encoder spends most of its time
<kurosu>
If I'm not mistaken in this analysis, it's a surprising fact
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<thardin>
entropy coding is slow for codecs like JPEG2000 that do CABAC for every bit. I don't think that's common
<thardin>
it also doens't tend to benefit as much from GPU acceleration. but again this is based on my observations of J2K
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<thardin>
smol .flac files
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<beastd>
BtbN: your trac instance looks nice and fast. don't have time to look deeper right now
<beastd>
BtbN: Creating commit links to videolan is a custom patch in our current instance. You should be able to find it our the trac vm. If you don't find it I will have a look later.
<BtbN>
yeah, michael already pointed me to it earlier
<beastd>
If I'm not misremembering it was even contributed here on IRC (back on freenode at that time) by one of the "old timers". Not sure by whom, so if you are still around please forgive me :)
<Marth64>
its indeed super fast
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<pal>
<broken record> J2K now has an alternative to CABAC
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<thardin>
yeah, HTJ2K
<thardin>
I wonder why they went with such a complicated thing in the first place, considering it was designed in the 90's, with computers immensely slower than what we have today
<pal>
thardin: two reasons: arithmetic coding allows arbitrary termination and there was a feeling that CPU speeds would continue growing
<pal>
... there may be other reasons.
<thardin>
right, it's cheaper to decode the lower the bitrate is
<thardin>
4k lossless j2k being a good example of something slow
<pal>
J2K (legacy) allows quality layers, i.e., it allows a decoder to decode only the first X bits of samples
<thardin>
yep
<pal>
super useful for interactive browsing... arithmetic coding is slow on CPU alas
<pal>
so HT adds the option for fast decode, but loses quality scalability (it retains resolution scalability)
<thardin>
I thought you could still terminate decoding early?
<thardin>
you kind of get what you get
<kurosu>
Also, from having worked with them, the people behind these early codecs were more scientists than implementers. And software and ASIC complexities are different things
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