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There's only 3 ways that I can think of:
1) Compress it vertically, this will lead to distortions on that axis.
2) Crop it, this will lead to a missing chuck at the top and/or bottom.
3) Scale it down and add borders / pad it on the left and right.
Yes, that will definitely work, but take a look at the output before you burn it. I'm betting it will use strategy #1. If you think it looks fine, burn it. Also, I don't believe that you need a '-o' for the output file so just:
ffmpeg -i input.avi -target ntsc-dvd output.avi
Last edited by H_TeXMeX_H; 09-10-2008 at 04:06 PM.
Also, you may want to check the specs of your DVD player, it will tell you stuff like what's the maximum video bitrate, audio bitrate, FPS, resolutions, etc. for a divx file. But, I'm betting if you have an divx avi to start with on a PAL DVD and it works, then when you convert it, it will work too. To see more info on the movie you can run:
ffmpeg -i input.avi
If you want to preserve as much quality as possible you should know about '-pass' option, set it to 1, then 2 and it will improve quality in the final video. If you want to pad the video with borders use '-padleft', '-padright' option. Take a look at the ffmpeg documentation it will tell you more. If you want a GUI try avidemux. Dunno if this will help, but if you find the ffmpeg documentation a bit think, here are some notes I made on how to use it:
Global: <option, list>, (units), [default], =description, #see description
ffmpeg <infile options> -i infile <outfile options> outfile
NOTE: Try to use as few options as possible, only those that are needed, usually
just bitrate, size, codecs.
-y =overwrite output files
-t <hh:mm:ss.xxx> =duration of transcoded video sequence
-fs # =file size
-ss <hh:mm:ss.xxx> =seek
-target <vcd, svcd, dvd, dv, pal-vcd, ntsc-svcd>
-dframes # =number of frames to record
-scodec <codec> =subtitle force
1) -b <bitrate> (bps) [200k]
2) -sameq =variable bitrate
-bt # (bps) =bitrate tolerance
-maxrate <bitrate> (bps)
-minrate <bitrate> (bps)
-r <fps> 
-s <wxh> [same as source]
-aspect <4:3, 16:9>
-pass <1, 2> =two pass encoding, for more accurate bitrates, high quality
-crop<top, bottom, left, right> <size> (pixel)
-pad<top, bottom, left, right> <size> (pixel)
-padcolor (hex) 
-vframes # =number of video frames to record
-vn =video null, disable video
-ab <bitrate> (bps) [64k]
-ar <freq> (Hz) 
-aframes # =number of audio frames to record
-an =audio null, disable audio