producer_avformat.c, consumer_avformat.c: use av_set_string3 where available (gets...

[melted] / profiles / hdv_720_50p

description=HDV 720 50p
frame_rate_num=50
frame_rate_den=1
width=1280
height=720
progressive=1
sample_aspect_num=1
sample_aspect_den=1
display_aspect_num=16
display_aspect_den=9