deinterlace with ffmpeg

[ingemar]

I'm encoding VOB to an AVI, using ffmpeg because I want to passthrough AC3. I encode at 1800, 2-pass, HQ, Use B-Frames, Trellis Quantization. Qmin=2, QMax=10, keyframes 240. Last but not least, I deinterlace.

Problem is when I play back on the computer or stream it to my Pinnacle showcenter in my homecinema set the playback looks interlaced, sometimes pretty bad.

Now I'm wondering if deinterlacing worked (maybe the result is still interlaced, how can I check?) or my settings are wrong?

Can someone advice please?

Thx again!
Ingemar.

[GMaq]

ingemar,
If you can view your VOB using ffplay (or whatever media player you view the avi's in) before you encode it, you should be able to notice if there are comb interlace lines, if you don't see them then you don't need to add "-deinterlace" to your script. If you deinterlace an already progressive source it will look bad and give you many jagged line artifacts which are most noticeable on diagonal lines in the picture. I'm not using ffmpegX but ffmpeg is the same core application, also you should have "-deinterlace" at the beginning of the script when needed not the end. Interlaced video should look fine on the TV in your home cinema even if it's progressive display. Deinterlacing in ffmpeg works very well, but you have to be sure your source is interlaced first.

[ingemar]

oke, thanks I'll check.

I more or less asumed that all DVD material was interlaced.