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

[Nicholas Robbins]

> On Saturday, January 11, 2014 10:40 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
> 
> What about -vn -sn?
> Does that change anything?
> (Just to understand the problem you see.)

Also changing -map 0:v to just -map 0 and it runs fine. 

>>  >> 
>>  >>  which stalls around 10 minutes in and starts using more and 
>>  >>  more memory eventually swapping.
> 
>>  > Does the issue maybe depend on a timestamp wrap?
>> 
>>  I don't know how to tell.
> 
> If you play the original vob file with ffplay and seek 
> (with "up" and "page-up") do you see monotonic timestamps 
> in the console output or does something funny happen?

I'm not sure what you mean.  If I do "ffplay IN.vob -ss 1580" (to skip to near the 26:25 error) then I get this on the console:

Input #0, mpeg, from 'WILLY_WONKA-1.vob':
  Duration: 01:13:06.64, start: 0.045500, bitrate: 9248 kb/s
    Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [SAR 32:27 DAR 16:9], 7500 kb/s, 24.08 fps, 59.94 tbr, 90k tbn, 59.94 tbc
    Stream #0:1[0x26]: Subtitle: dvd_subtitle
    Stream #0:2[0x24]: Subtitle: dvd_subtitle
    Stream #0:3[0x22]: Subtitle: dvd_subtitle
    Stream #0:4[0x20]: Subtitle: dvd_subtitle
    Stream #0:5[0x82]: Audio: ac3, 48000 Hz, mono, s16, 192 kb/s
    Stream #0:6[0x84]: Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s
    Stream #0:7[0x80]: Audio: ac3, 48000 Hz, 5.1(side), s16, 384 kb/s
    Stream #0:8[0x83]: Audio: ac3, 48000 Hz, mono, s16, 192 kb/s
    Stream #0:9[0x81]: Audio: ac3, 48000 Hz, mono, s16, 192 kb/s
[ac3 @ 0x7f7e0c038f90] frame sync error
Frame changed from size:0x0 to size:720x480B vq=  533KB sq=    0B f=0/0   
1587.83 A-V: -0.011 fd=   0 aq=  523KB vq=14753KB sq=    0B f=0/0   f=0/0  

the 1587.83 number increases monotonically.

If I add -loglevel debug I get tons of this:

[mpeg @ 0x7f9f080008f0] first_dts 4102 not matching first dts 142585702 in que
    Last message repeated 1 times
[mpeg @ 0x7f9f080008f0] first_dts 4102 not matching first dts 142594342 in que
[mpeg @ 0x7f9f080008f0] first_dts 4102 not matching first dts 142600102 in que
    Last message repeated 1 times
[mpeg @ 0x7f9f080008f0] first_dts 4102 not matching first dts 142608742 in que
[mpeg @ 0x7f9f080008f0] first_dts 4102 not matching first dts 142614502 in que
    Last message repeated 1 times
[mpeg @ 0x7f9f080008f0] first_dts 4102 not matching first dts 142623142 in que
    Last message repeated 1 times
[mpeg @ 0x7f9f080008f0] first_dts 4102 not matching first dts 142631782 in que
[mpeg @ 0x7f9f080008f0] first_dts 4102 not matching first dts 142637542 in que

but the 142637542 increases monotonically. 

> Can you upload the sample that causes the memory problems?

It happens on this sample 26 minutes in. That is approximately a GB file. I don't think you want me to upload it. Would a dd grab from the middle help? I don't know if that is how vob's work.

> Does it happen with all vob files?

It seems to happen with movies more than tv-shows. I've only tried about half a dozen dvd's and it happened on both movies I tried, but not on tv-shows.

 

-Nick