[FFmpeg-user] Reversing PAL->NTSC telecining.

Nicholas Robbins nickrobbins at yahoo.com
Fri Jan 10 15:53:34 CET 2014

> On Thursday, January 9, 2014 9:34 AM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> > Nicholas Robbins <nickrobbins <at> yahoo.com> writes:
>>  ffmpeg -fflags +genpts -i IN.vob  -map 0:v  -c copy OUT.mkv
>>  which stalls around 10 minutes in and starts using more and 
>>  more memory eventually swapping.
> I tried to reproduce this with the following commands:
> $ ffmpeg -f lavfi -i testsrc=s=pal -target pal-dvd -t 5400 out.mpg
> $ ffmpeg -fflags +genpts -benchmark -i out.mpg -c copy out.mkv
> The second command finishes immediately and does not consume 
> much memory.
> Does the issue maybe depend on a timestamp wrap?

I don't know how to tell. The resulting file seems fine, and no errors are produced.

>>  > (And why are you using -c copy, I thought this is all about 
>>  > inverse telecine?)
>>  My process is 
>>  1) Rip and mux to something with all the metadata I want to keep
>>  2) Inspect for interlacing or telecining visually
>>  3) Transcode to x264 removing interlacing or telecining etc.
> Why don't you start with 2), and merge 1) and 3) ?
> Carl Eugen

Well, 1) involves physical media and takes about an hour per disc. So I just keep feeding the discs into the machine when it spits them out. Then 2) involves my time and I can do that when I want. Then 3) takes substantial time again.


More information about the ffmpeg-user mailing list