simple fixing bad frames question

[patterson]

I have a divx movie with a couple bad frames. It crashes every program except divfix including vdub mp3 freeze, tmpgenc, and vdub when I try to cut out the bad section. My question is how do I get these frames out without vdub crashing? I've tried going ahead of the actual frame and well behind it.

[ZippyP.]

Have you tried to cut out the bad section manually? Did you get a frame number when Vdub crashed?

If you know where it's located then you can mark on either side of it at the key frames and cut it out. Check the Edit section (over there <<<<) for a guide to editting with Vdub.

8)

[patterson]

I do have the exact frame # so I tried to cut out a few frames before that # to a few frames past and vdub crashes. I don't understand what you mean by cutting them manually.

[ZippyP.]

By manually I just mean marking and cutting yourself, as opposed to using the "Scan for Bad Frames" function which marks the bad frames for you.

You should be using the yellow "key frame" buttons (which advances the video from key frame to key frame) to locate your start and end cut marks. Vdub won't let you cut in between the key frames so it's at the key frames where you need to make your cuts, not just a few frames either side of the bad frames. So, locate where you'd like to start the cut, then press the left key frame button, then mark that as the start of the cut. Locate the after the bad frames then press the right key frame button and mark that as the end of the cut. Delete selection, set audio and video to direct stream copy and save avi.

Hope that helps.

[whatsupnow]

You say divfix doesn't crash so you should be able to use it to remove the bad frames by ticking the appropriate box at the bottom of the screen and the running rebuild index from the options box.
Divfix will recreate another avi which if you check it again will be clear of errors i use this option quite a lot.
Before i burn the movie i will run it through media player at the begining, middle and end of the movie just to make sure the video and audio aren't out of sync and then burn away.

[patterson]

I have been trying to remove the bad section manually then but it crashes vdub when doing so.I will try divfix again but I'm pretty sure it still crashes programs . I will report back with result. Thank to everyone for helping with this.

[whatsupnow]

Here's a Forum link that gives a step by step guide and links to the program (virtualdub with mp3 freeze).

https://www.videohelp.com/forum/userguides/153907.php

When you use the link to virtualdub with mp3 freeze just scroll down the list of the vdubs untill you find the right one.

Let us know how you go on.

[Dragonsf]

Maybe you can try avisynth as frameserver.Just makr all your bad frames like c=c.deleteframe(x).duplicateframe(x-1) where x is the bad frame number and c is you clipn (opened with c=avisource("...").You must of course return c:

c=avisource("...")
x=1234
c=c.deleteframe(x).duplicateframe(x-1)
x=4567
c=c.deleteframe(x).duplicateframe(x-1)
....
return c

Put this into a text file myavi.avs and open that in Vdub.

[patterson]

I finally got vdub to mask the bad frames by taking out a bigger chunk than I wanted to but that's fine. Now my problem is the new movie that is fixed is out of sync from the begining. I think I did everything right in vdub I did as follows- open video file-direct stream copy video and audio-edit- go to- type in the frame # then o.k.- start offset- then edit go to I typed in the last frame then o.k. then I hit next key frameand end offset- then I hit mask marked frames then save avi. I don't understand why the final fixed movie is out of sync from the begining. The original sync is fine. I hope this is enough info for you to help me out.

[Dragonsf]

Have you tried the AviSynth approach?With delete->duplicate it will preserve audio.And I'd demux video and audio, then convert and then remux (maybe with delay in audio to get exact sync)

[whatsupnow]

In virtual dub under options have you got the SYNC TO AUDIO option ticked??