deinterlacer does not clear interlaced_frame flag

[Fritz]

transcoding to a y4m file. used -deinterlace which did deinterlace the video, but the y4m header has the interlaced bit set. This also occurs with libav and yadif.

This patch fixes the problem with -deinterlace by clearing the bit on a successful deinterlace.

Looking through yadif it appears that the flag is cleared, but it was still showing up on the file. I did not pursue it further.

[Fritz]

patch to clear interlaced_frame flag when using -deinterlace

[Fritz]

file used
 http://samples.mplayerhq.hu/MPEG2/interlaced/koncercik.mpg

ffmpeg -i koncercik.mpg -an -y -pix_fmt yuv420p -deinterlace koncercik.y4m

[michael]

writing into the decoders coded_frame is not a good idea. Iam not saying it does break something but its risky / not proper

[michael]

btw, i would suggest you use -vf yadif which does a better job at deinterlacing and should set the flags correctly

[michael]

Closing as -deinterlace is deprecated now and it should work with the video filters. If it doesnt work with -vf ... then please open a seperate ticket for that.
That said if someone wants to implement this for the deprecated option, iam not opposed but the patch must not write into things that its not supposed to write into ...