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 7.1.1 has been released! | Please read ffmpeg.org/developer.html#Code-of-conduct
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<compnnn>
kierank / jdek : and within 6 minutes of Chandra contacting admin to subscribe to libav-user , i subscribed him. i wonder if confirmation mail is in his spam dir as mailing list mails go there , especially in gmail
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<cone-513>
ffmpeg Andreas Rheinhardt master:b857bf942c26: avcodec/hevc/hevcdec: Simplify access to luma plane
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<mlauss2>
Good Morning, I'd like to add audio support to the smush/san formats. Source audio is multiple streams of plain 8/12bit 1/2ch 11kHz/22kHz/arbitrary samplerate data with volume and pan information. Is there infrastructure within ffmpeg to have all those upsampled to 16bit/2ch/22kHz and mixed together? Thanks!
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<cone-513>
ffmpeg Leon Grutters master:76f09ab647d1: avcodec/webvttdec: update documentation
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<Traneptora>
mlauss2: there is but it's not the job of a decoder to do that
<Traneptora>
you can just output the 8bit pcm and let it happen down the line
<ramiro>
jamrial: SLIBOBJS was added in 56572787ae2 (2013). SHLIBOBJS was added in 20b0d24c2f7 (2021). uses of SLIBOBJS were transferred to SHLIBOBJS in b77fff47d0d (2022). does it make sense to remove SLIBOBJS now?
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<jamrial>
ramiro: if nothing uses it, then yeah
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<RuMi_Nos>
Hello! Is this a suitable place to talk about GSoC?
<JEEB>
yes
<RuMi_Nos>
I am interested in the VP6 encoder project for GSoC. Based on what I have read, I should familiarize myself with the codebase and fix a bug as a qualification task. However, I don't know where to start, nor do I know which bug i should tackle.
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<ramiro>
haasn: from within an SWS_OP_CONVERT, how do I know which elements I need to convert? there is no mask nor element count
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<haasn>
ramiro: you can look at comps.unused in theory
<haasn>
That’s how the existing code does it
<haasn>
This is for the JIT backend still?
<haasn>
If so then you can just use comps.unused to optimize away unused conversions
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<haasn>
I don’t think it makes sense to introduce a subset of a conversion because I don’t want to introduce the possibility of having a mixture of pixel formats
<haasn>
Like float luma and integer chroma
<haasn>
Seems like more headache than it’s worth
<haasn>
ramiro: for the kernel-based backends (ff_sws_op_compile_tables or w/e), if you set comps.unused on your implementation it will get preferentially picked when the op to match also has that component marked unused
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<cone-495>
ffmpeg James Almer master:c3522716ff3f: avfilter/vf_zscale: add support for half precision float RGB formats
<cone-495>
ffmpeg James Almer master:0ce405afb8df: avfilter/vf_zscale: add support for grayscale formats
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<ramiro>
haasn: thanks. comps.unused worked well
<ramiro>
the jit code is improving nicely. I had to fix some suboptimal register allocation in asmjit, and that took some time. I know nothing about register allocators.
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<haasn>
Interesting
<haasn>
The x86 SIMD backend is going well also
<Lynne>
asm?
<haasn>
Yeah
<haasn>
I am using the GCC vectors version as a base and incrementally rewriting the worst functions in asm
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<jamrial_>
haasn: re xyz failures on x86_32, just hardcode the value for the failing index in the table, if storing the entire table is not to your liking
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