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I am trying to change a video with Rotation, rounded corner, transparent, scaling, and border all with together and overlay on a video; I am trying to do this with FFMPEG in PHP but getting issue in transparent background; I am getting green background please help;

ffmpeg -i empt_vid_5891581054410.mp4 -i merged-571580302534.mp4 -filter_complex "[1:v] rotate=-    30*PI/180:ow=rotw(iw):oh=roth(ih):c=none [rotate];[0:v][rotate] overlay=40:10:enable='between(t,2,7)', colorchannelmixer=aa=0.5" -auto-alt-ref 0 -pix_fmt yuv420p -c:a copy overlayavatar.mp4
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Add format=yuva444p, before 'rotate'.

ffmpeg -i empt_vid_5891581054410.mp4\
-i merged-571580302534.mp4 \
-filter_complex "[1:v]format=yuva444p,rotate=-30*PI/180:ow=rotw(iw):oh=roth(ih):c=none [rotate];[0:v][rotate] overlay=40:10:enable='between(t,2,7)', colorchannelmixer=aa=0.5" -auto-alt-ref 0 -pix_fmt yuv420p -c:a copy overlayavatar.mp4

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