how to convert I420 to yv12

[china_y_]

hi body

i am using the intel sdk sample .

what i got is I420 but the encode needs yv12 

how can i convert I420 to yv12 without the intel media  sdk

[dr_asik]

ffmpeg's swscale should do the trick. Alternatively, it's very easy to code this yourself. Look at the definitions of the formats:

http://www.fourcc.org/yuv.php#YV12

http://www.fourcc.org/yuv.php#IYUV

I420 is exactly the same as YV12 except that the order of the U and V planes is reversed. Three memcpys are you're done.

[Anthony_P_Intel]

and, the file writer part of sample code can be changed to write YV12 instead of I420, as the actual MediaSDK API is 3 pointers to the 3 planes (allowing direct support for all YUV420 variants), and the only thing making it a "YV12" file is the code that writes it out in that order.