[Libav-user] "No accelerated colorspace conversion found from yuv420p to rgb24" FFmpeg 2.5.3

[Yaron Jackboy]

Hi, I was looking around to find the reason for the warning while running
with the compiled FFmpeg:

"No accelerated colorspace conversion found from yuv420p to rgb24"

and found it's related to the reason of not usging the GPU.

did the following with no difference:

1) compiled the FFmpeg with x264

2) added to the configure flags: --enable-neon

3) added --enable-static

this warning become when calling:

sws_getContext with PIX_FMT_RGB24 where the source is YUV420P

compiled for iOS all architecture but when trying only one still same result

any idea?


Thanks,

Yaron

[c***@megaroms.co.uk]

Post by Yaron Jackboy
Hi, I was looking around to find the reason for the warning while running
"No accelerated colorspace conversion found from yuv420p to rgb24"
and found it's related to the reason of not usging the GPU.

It's not at all related to the GPU. It's related to their being no
architecture specific version of the colorspace conversion for the CPU you
are targeting.

Post by Yaron Jackboy
1) compiled the FFmpeg with x264

Wouldn't expected it to.

Post by Yaron Jackboy
2) added to the configure flags: --enable-neon

This will help the performance of the non -CPU specific version of the
colour conversion and a good flag to have anyway.

Post by Yaron Jackboy
3) added --enable-static

Maybe a slight performance difference if using link time code generation
but otherwise useless.

Post by Yaron Jackboy
sws_getContext with PIX_FMT_RGB24 where the source is YUV420P
compiled for iOS all architecture but when trying only one still same result
any idea?

The warning is simply that no one has written an optimized version of the
colorspace conversion in libswscale for ARM. I can only see PPC and x86
asm versions, i.e. it's nothing to worry about.

Post by Yaron Jackboy
Thanks,
Yaron
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