[MEncoder-users] B-frames and GOP with MPEG-2 for DVD

[Nicolas Hesler]

Nico Sabbi wrote:
> Nicolas Hesler wrote:
>
>   
>> So even if I get 1 duplicate frame (which seems to be case, in all my 
>> videos), it could still be in absolute sync?
>>  
>>
>>     
> yes
>
>   

I just ran another test using a couple of different clips with -noskip 
and -mc 0 removed and noticed the following:

The duplicate frames happen at the same intervals on different clips.   
It seems as though they always happen at 1.0s (25f), 83.4s (2002f), 
166.8s(4004f), and so on until near the last frames.   Can you explain 
why it says it's skipping frames in such a pattern?  (Because my current 
clips are small, I'm compiling a large clip to see if the pattern 
continues). 

ENABLED SOFT TELECINING, FPS=29.97, INITIAL PATTERN IS TFF:0, RFF:1

1 duplicate frame(s)!
Pos:   1.0s     25f ( 0%)  5.39fps Trem:  10min 120mb  A-V:0.085 [7292:224]
Skipping frame!
Pos:  83.4s   2002f (39%)  6.01fps Trem:   8min 157mb  A-V:0.061 [5998:224]
Skipping frame!
Pos: 166.8s   4004f (79%)  6.01fps Trem:   2min 158mb  A-V:0.061 [5996:224]
Skipping frame!
Pos: 208.5s   5005f (99%)  5.99fps Trem:   0min 157mb  A-V:0.060 [5963:224]
Skipping frame!
Pos: 210.7s   5058f (100%)  6.04fps Trem:   0min 156mb  A-V:0.028 [5908:224]
Flushing video frames
Writing index...

Overhead: 1.496% (2416636 / 161523716)
Writing header...

Video stream: 5908.883 kbit/s  (738610 B/s)  size: 155632964 bytes  
210.710 secs  5058 frames

Audio stream:  224.000 kbit/s  (28000 B/s)  size: 5911808 bytes  211.136 
secs