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 7.0.1 has been released! | Please read ffmpeg.org/developer.html#Code-of-conduct
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<Lynne>
>lavd opengl breaks builds on osx
<Lynne>
it's a one-line fix, but I think it makes a case for its removal
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<courmisch>
is there a trick to run a specific FATE test under GDB?
<courmisch>
I guess copy the command and append _g to ffmpeg
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<elenril>
does anyone know what does NUH/NUT in HEVC actually stand for?
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<courmisch>
Nonobviously Useless Transform
<courmisch>
sounds about right
<jkqxz>
elenril: Yes?
<jkqxz>
Nal Unit Header / Nal Unit Type?
<elenril>
is that like inverse hungarian notation
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<elenril>
and why do only some nal types have the _NUT suffix then
<jkqxz>
nuh_* is to be consistent with every syntax element which might appear in multiple places having a namespace prefix, which seems like a good idea.
<jkqxz>
No idea why the names are incompletely NUTs.
<courmisch>
everybody, stand back! I'm writing DCT code and I have no idea what I am doing
<haasn>
is there a name for the 0.1% speed difference between NTSC/PAL timings (23.976 / 29.96 / 59.94) and mains frequency (24/30/60)?
<kurosu>
Can't recall a name, and the reason vaguely, but that was when colour was introduced to broadcasts: the physical, analogical signal would have been causing interferences with sound
<kurosu>
something like frequency carriers overlapping
<kurosu>
also yes, the infamous "dot crawl" effect when chroma signal was bleeding into luma, or vice versa (rainbows around edges)
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<courmisch>
haasn: yes, bad idea
<Lynne>
courmisch: V=1, copy the command line and run it under gdb
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<Lynne>
which DCT are you writing? vc-1's?
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<courmisch>
Lynne: FDCT
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<Lynne>
I'm planning to replace that one in the future with the DCT I'll use for jpeg-xl, which is also orthogonal (forward == inverse) and overall a better approximation
<Lynne>
it may be several months, but if you don't mind that eventually it might be gone, sure
<Lynne>
I'd recommend doing VP8's or VP9's DCTs, those are specified in the standard, rather than "if your approximation is at least this accurate, good enough"
<courmisch>
sigh
<courmisch>
I almost finished the row function already
<courmisch>
also somebody did the aarch64 version like a month ago
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