frames are good but cant be decoded??

[xsbs52x]

i have a strange video. i downloaded it off kazaa and it has a frame rate of about 15 fps. it also has a few bad frames and virtualdub says that it has like 5000 frames that are good but they cant be decoded. what does this mean and how can i fix them? also how can i change the frame rate to 29.97 fps without the speed of the video changing? any help would be greatly appreciated.

[xsbs52x]

any ideas??

[LisaB]

avi's are made up of key frames and delta frames. The delta frames contain information about the change from the last frame to the current frame. If you have a bad frame, then all the delta frames after the bad frame (up until the next key frame) can not be decoded, because they depend on the bad frame. key frames are independent and complete all by themselves. delta frames are a way to make the file size smaller. sounds like some idiot decided to put way too few key frames in your avi, to save a few MB. Now you're screwed because just a few bad frames means lots of undecodable frames.

[xsbs52x]

is there any way to recover the frames? i mean the data has to still be there, even if that one frame before it is currupt, right?

[ZippyP.]

also how can i change the frame rate to 29.97 fps without the speed of the video changing?

If you're using TMPGEnc then just use the NTSC 29.97 fps template and the framerate (and frames) will be doubled (approx.) and the sound should stay in sync. Any movement will be jerky looking though.

I don't think you will be able to recover your undecodable frames.

[xsbs52x]

ok, well if i encode with TMPGENC, what will happen to all of those bad frames? I tried to recompress the video with virtualdub, but it just gave me an error when it came to the first bad one.

[ZippyP.]

You can try and encode without removing the bad/undecodable frames but you will probably see any number of problems. Freezing, crashing or bad A/V sync being the most common.

[secretagent]

scan for bad frames in vdub. then do a direct stream copy of audio and video and save as new avi. open new avi in vdub and frameserve to tmpgenc. according to the help file in vdub it will not save bad frames in the new avi. but i dont always find this to be true. if it doesnt then you must cut the bad frames out manually. guides available to your left.

[xsbs52x]

ok, ill try that tommarow...must sleep.....thanks for your help ill let you know if it worked