Bad Frames On A SVCD movie

[|Supreme|]

Hey.. Was trying to do this re-encode of a SVCD movie thats in PAL format to NTSC.. Anyways during the reencode it stops at a specific frame and stays like that for 20-30 min. Basically when I playback the movie.. its stuck on one frame for 20-30 minutes.

How do I fix these bad frames? I've seen a guide for AVI movies but no VCD/SVCD guides.

[BJ_M]

cut it out with mpeg2vcr or tempgenc

[DJRumpy]

That depends entirely on how you are re-encoding your video. You need to list the tools that you are using, and the method you are using. Are you using TMPGenc to re-encode, or another method like DVD2AVI and CCE?

In either case, if you know the frame number, you can simply skip it using the Source Range filter in TMPGenc, or the TRIM command in AVISynth, The Source Range buttons in VirtualDub. You can also cut it out using DVD2AVI itself since it also has source range buttons. Search the GUIDES section for MPEG to MPEG and MPEG to SVCD guides for specific examples.

[|Supreme|]

I am using TMPGenc to reencode.. Changing resolution to 720x480.. and framerate to 29.97fps. I don't know exactly what frame causes it to freeze.

I read virtualdub-mp3 or something actually searches for bad frames and then you can cut them without audio problems. But I think it only works for AVI files.

[DJRumpy]

Correct. That function scans AVI's for unreadable frames. Since your source is MPEG, try running it through VCDGear with the 'Fix MPEG Errors' option turned on, and the 'Disable MPEG File Splitting' option turned ON as well (you'll find the splitting option under the OPTIONS button). It can often repair simple errors in an mpeg. It should produce a new 'fixed' file which you can try to re-encode.

You can also use the MPEG Tools in TMPGenc to repair simple problems. Specifically the FILE -> MPEG TOOLS -> MERGE & CUT tool. You don't actually merge or cut anything. Just specify the input mpeg, and then an output mpeg and then click Run.

[|Supreme|]

Thanks.. but like I said during the encode.. it just froze. I believe its a bad frame. I don't get why theres not a program that is identical to virtualdub for mpeg files that checks for bad frames.

But I'll give that a try.

[|Supreme|]

Ok, I used that source range function.. And checked out a few of the frames. Theres 3 in particular that look irregular with pixels in the wrong places and stuff. I know exactly which 3 frames. I think I can cut a selected area in the source range. But wouldn't I get audio sync errors?

I think I read a guide for virtual dub it says it avoids sync errors for avi even when getting rid of bad frames.

[DJRumpy]

Remember that your audio is tied to your video at this point. Cutting the video frame also cuts the audio frame with no loss of sync.

[|Supreme|]

Ok.. well I ended up removing 54 frames.. Only way I could get it to work. But I don't think there were 54 consecutive bad frames..

Source range filter did work. Still want to find a program like virtualdub for mpegs for auto finding bad frames. I think I cut more frames than were necessary. Not that big of a deal though.

[|Supreme|]

Just ran into a problem. Used source range to cut the 54 frames that were bad. However the sound is gone. The video is fine. Plays after the cut part but the sound after the part I cut is gone. Any idea why this is?

[|Supreme|]

Not sure if anyone wants to find out what I did. But I used mpeg2vcr and cut 2 frames (not 54 frames).. and the movie was fine That program rocks. Also merged svcds without audio sync errors.

[BJ_M]

yes - what i suggested way up above ...