BtbN changed the topic of #ffmpeg to: Welcome to the FFmpeg USER support channel | Development channel: #ffmpeg-devel | Bug reports: https://ffmpeg.org/bugreports.html | Wiki: https://trac.ffmpeg.org/ | This channel is publically logged | FFmpeg 7.0 is released
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<snoriman>
Hi, I've created a SwsContext to convert from NV12 to RGBA. I'm running into a memory corruption issue so I'm sure I'm doing something wrong; the strange thing is however that it only happens with images that have a size of 1080 x 1920, all other images which are 2160 x 3840 are scaled correctly. I use `av_image_alloc()` to allocate the output buffers with an alignment of 16 and I suspect that's
<snoriman>
the issue but I'm not entirely sure why and what a good solution is?
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<BtbN>
try consulting valgrind to point at the immediate source
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<snoriman>
also when I change the alignment to 32 things works correctly
<BtbN>
wrong alignment isn't normally something that causes memory corruption
<BtbN>
it'll either just crash or be slow
<BtbN>
that report looks incomplete to me
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<snoriman>
BtbN: I've updated the gist with a bit more lines
<BtbN>
The only actual issue is the invalid write
<BtbN>
make sure to build your code with debugging symbols, otherwise it's just all ???
<snoriman>
hmm debug symbols are enabled
<BtbN>
My guess would be that there's not enough padding, so it over-writes
<snoriman>
I got the feeling it might be related to the output format (RGBA) ad 16 alignment
<snoriman>
yeah
<BtbN>
If this is on x86_64 and using AVX2, you must align by 32 bytes, otherwise it can overwrite by up to the difference to 32 bytes
<BtbN>
If it's using AVX512, it's even up to 64 bytes
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<snoriman>
ok thanks! is that because SWS uses this?
<snoriman>
or that it might use it
<BtbN>
I don't understand the question
<BtbN>
clearly something makes use of 32 byte blocks, otherwise it wouldn't over-write
<snoriman>
I was thinking about what you said regarding AVX2 and AVX512. If that determines the alignment, how do I know what to use? (sorry if this is a stupid question)
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<snoriman>
I think that I'm still not being clear enough
<snoriman>
From my understanding my CPU can have both AVX2 and AVX512 support and I can create a function that uses AVX2 or AVX512 or both. Though based what is used by the function, there is a specific memory alignment requirement. It seems that this is the case for SWS. But how do I know what alignment requirement it has?
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<kepstin>
If you're working with stuff in AVFrame, the answer is usually "you don't need to, just use the av frame methods to allocate the buffer with automatic alignment".
<kepstin>
"av_frame_get_buffer" with the align parameter set to 0 will use automatically chosen alignment and padding that will work with swscale.
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<snoriman>
kepstin: ah thanks! So instead of using the `sws_scale` I use `sws_scale_frame()` ?
<StephenLynx>
hey, when I moved from av_image_alloc to av_frame_get_buffer, my gif stopped being animated. even the filesize is shorter. any ideas? https://pastebin.com/R7hDiMc4 the whole code. I prepare the frame at line 165.
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<travisghansen>
is webrtc supported as either input or output? info seems sparse..
<BtbN>
no
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<travisghansen>
cool, thanks for the info
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