I have a MPEG-4 Simple Profile video with size 720x288, pixel aspect ratio of 2:21:1 (ffmpeg says SAR 1:1, DAR 5:2). I'm trying to use the command I usually use to convert it do DVD format:
ffmpeg -i inputfile.avi -target pal-dvd outputfile.mpg
This produces a 720x576 video which plays fine with video players on the PC. But when I try to burn this to a DVD (with 16:9 aspect ratio), the image is stretched. Playing around with VLC, I understand the video has a pixel aspect ratio of 2:21:1, so when reproduced at 16:9 images are vertically stretched.
I would have expected "-target pal-dvd" to fix this automatically, but it does not. I read some information on the Internet and I think the key is about setting the correct sar/dar, but I tried some combination and I was not able to obtain the result I want, probably because I don't perfectly understand the logic to determine the right values to set. It's fine for me to have black bands over and below the image, but the video aspect ratio must be preserved, of course.
By the way, I'm getting the same results with avconv instead of ffmpeg.
Thanks in advance.