Comskip/GBPVR

[djtaylor]

Not sure where to look for the solution to this one.

With Erik's help and a new detection method within comskip, I now have comskip accurately finding commercials, the problem is that when I use the play button within GBPVR to skip past them, it's skipping about 20 to 30 seconds past the end of the commercials and so i'm losing that amount of the programme.

I'm thinking of using comskippad to back up by an appropriate amount but that does feel like a bodge.

Any suggestions, is there a setting somewhere that I've missed that would allow GBPVR to hit the right frame? I'm not doing an autoskip.

David.

[betlit]

IIRC, thats a problem of the (.net?-)technology sub uses. there is no method to skip ahead to a specific frame, but only to a 'point in time' (using milliseconds or something).
so sub has to calculate the amount of time to skip based on framerate of the file and the frame-no provided by comskip, etc.

i guess this leads to problem when using variable bitrates... but i never heard of discrepancies that high...

(sub might want to correct me or provide more infos)

[djtaylor]

Ok. Yes, the numbers are high enough that it becomes a problem, I've just seen another where the show actually restarted at 6:10 (minsec) into the show yet GBPVR resumed at 7:34.

Having seen how accurately comskip is now hitting the commercials though, I'll play for a bit longer and then may just use Videoredo to automatically cut the commercials, I'll still keep the original of course

Sub, is there something special that I might have misconfigued?

David.

[Jim_]

Hi David,
I’ve had very good luck with comskip & GBPVR using the default settings. Maybe a second or two early at the beginning of a commercial, but very close to perfect when the show returns.
You can adjust the padding setting in the comskip.ini but I haven’t tried it.
padding=

[djtaylor]

The problem I found with the padding value was that it trims both sides such that I was having to wait for 30 seconds or so of the beginning of the commercials before being able to press play. This was fudged so much that the numbers are just too high, hence I'll play with comskippad.

It's just a pity that the seek doesn't sound like it can be to a frame because comskip is getting the right points, seems such a shame to have to apply a huge fudge afterwards.

David.

[sub]

Usually its only a second or two out on the PC, or maybe a bit more on an MVP.

On a PC, I usually take the frame number from the comskip file, divide it by the detected frames per second for the file, then tell directshow to jump to that time location. Directshow wont do frame accurate seeking with a .mpg file, but it shouldnt be too far out.

[djtaylor]

Hmm, I wonder what's going so badly wrong here then? Is there any debug info I can leverage at all?

Edit: I can confirm that on the PC, it's hitting it pretty much spot on but on the MVP, like I said, that first show after commercials starts at 6:10, the MVP playback jumps to 7:40 which is huge.

David.

[Jim_]

I see you use VideoReDo.
Does running Quickstream fix on the mpeg have any affect? If you output a VideoReDo project with comskip, do the cut points look ok?

If I commercial auto-detect a mpeg (that has a few problems), using both Comskip and VideoReDo. My MVP plays back the VideoReDo generated Auto-Skip.txt perfectly.
But the comskip Auto-skip.txt and Vprj cuts are off.

But.
If I run “Quickstream Fix” on the mpeg and open the original comskip *.Vprj again, the cut points are correct.

Something to try anyway...

[djtaylor]

I see you use VideoReDo.
Does running Quickstream fix on the mpeg have any affect? If you output a VideoReDo project with comskip, do the cut points look ok?

Yes, the cut points are bang on and on the PC they playback fine too, it's obviously the MVP playback that's affected.

If I run “Quickstream Fix” on the mpeg and open the original comskip *.Vprj again, the cut points are correct.
Something to try anyway...

I'll have another look, I *think*, I'm running Videoredo in remux mode, then I run comskip. If it works for you, it's motivation for me to look again because it's so nearly there.

Cheers
David.