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3075 Discussions

YUV output problem after YV12 to NV12 conversion

shavkat_n_
Beginner
‎04-19-2017 11:52 PM
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Hello

I'm doing color conversion YV12(YUV420) to NV12 using ffmpeg using sws_getCachedContext & sws_scale. Then I feed it IntelMedia VPP & Encoder. I have output but it is as following.

Y(luma) seem ok, but there seem to be a mismatch with UV(chroma) planes. Please give a hint if you recognize this problem.

912345_1minvideo.mp4_20170420_113501.028.jpg

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shavkat_n_
Beginner
‎04-20-2017 06:37 PM
1,223 Views

I found the reason for this issue. Seems output slice linesize was being bitshifted and got cut in half. 

Isn't avcodec_get_chroma_sub_sample for AVPixelFormat of AV_PIX_FMT_NV12 supposed to output 0 for horizontal shift ??

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