[MEncoder-users] ivtc using mencoder

[Mike Hodson]

> Thanks for the reassurance, Mike.  You are correct that the -vf pullup seems
> to display the video correctly.  This is good news.  But is there a way to
> issue the following parms (-vf pullup -ofps 24000/1001) without re-encoding,
> i.e., perform *only* the ivtc with no loss?
No, as the video was originally saved in full 60i format. Granted, the
camera only was active for 24 frames, it hard-telecined into the mpeg
video.

> Obviously, I have no idea how to use this tool at all, because my first
> instinct was to try this:
>
> mencoder -vf pullup -ofps 24000/1001 24p000.m2t -oac copy -ovc copy -o
> output.m2t
>
> which produces a horrible output with artificats everywhere :-)  What else
> can I try?

Unfortunately you must re-encode the video, so ovc copy will not work.
 -oac copy will be fine.

You will want to look at the libavcodec parameters, -oac lavc
-lavcopts and such.  As your input video is HD, going to a raw-dv
format while being the best way at preserving quality will be
extremely large, but easy to edit.  You may consider this.

Otherwise, re-encoding to mpeg2 isnt a bad option, you will want to
set your vcodec=mpeg2, keep your vbitrate at or possibly slightly
higher than the input (and don't be alarmed if lavc is able to make
the output file smaller, even if you specify a maximum bitrate higher,
it is quite efficient, and converting from interlace to progressive
tends to reduce bitrate) and check the mpegopts parameter as well.

Mike