Canon EOS movie: variable framerate problem

[jullebarge]

Hello !

It's my first post here, I hope it's in the right forum.

I recorded a movie using a software called "eos-movrec" (http://sourceforge.net/projects/eos-movrec/) that allow to record liveview from any Canon EOS camera.

The problem is that it create an variable framerate avi file (with MJPEG compression) that I cannot handle. I want to sync audio on it (recorded with my computer), and as the video is variable framerate, I can't manage to sync both.

A simple delay on the audio track doesn't help...

Any idea and tool to convert my variable framerate avi file to a constant one ?

[jagabo]

No such thing as variable frame rate AVI. You probably just dropped frames while recording. Or the frame rate in the AVI header simply doesn't match the actual frame rate of the video. You can change the AVI frame rate with a tool like AviFrate -- to make the length of the video match the length of the audio.

[jullebarge]

Yes, it can be the problem... And is there a tool that can insert frames to an avi file ?

[minidv2dvd]

unfortunately jagabo there are variable frame rate videos and they are a pain to work with. here's a way with avisynth. basically convert to 120 fps cfr. then work with that.

http://avisynth.org/VariableFrameRateVideo

[jagabo]

unfortunately jagabo there are variable frame rate videos and they are a pain to work with. here's a way with avisynth. basically convert to 120 fps cfr. then work with that.

http://avisynth.org/VariableFrameRateVideo

Many editing programs (including VirtualDub and AviSynth) assume that the video is cfr, partly because avi doesn't support vfr.

I deal with VFR video all the time. But never in an AVI file.

[lordsmurf]

This method of capturing doesn't sound stable, you may not be able to use it.

[minidv2dvd]

sorry jagabo, i was assuming avi in the general sense. i looked at the capture program and it's kind of sketchy. it writes the framerate to the file by taking the total number of frames and dividing by the number of seconds it captured. also it's not really AVI - there's no audio at all to interleave. more like a crude motion jpeg.

[jagabo]

Yes, it can be the problem... And is there a tool that can insert frames to an avi file ?

I don't know of any way to fix dropped frames after the fact. Some capture programs know when they've dropped frames and will substitute the last good frame. It sounds like the program in question doesn't do that.