Re: Importing .avi

Posted by Michael Schmid on
URL: http://imagej.273.s1.nabble.com/Importing-avi-tp5000582p5000583.html

Hi Alex,

FPM4 is an MPEG-4 format, highly compressed, which cannot be read by ImageJ.
You can use a program like ffmpeg to convert it to a format readable by ImageJ, e.g.
  ffmpeg -i myInputFile.avi -pix_fmt nv12 -f avi -vcodec rawvideo convertedFile.avi

This converts it to NV12. NV12 is an uncompressed format except for chroma subsampling, which is also present in all compressed formats such as MPEG-4 (color information if given only for 2x2-pixel blocks).
If your files become too large with NV12, you can try
  ffmpeg -i myInputFile.avi -f avi -vcodec  mjpeg convertedFile.avi
This introduces additional compression artifacts, however (in addition to the compression artifacts of the original file).

ffmpeg is available for all major operating systems.

Michael
________________________________________________________________
On Oct 30, 2012, at 11:56, Alexander Haverkamp wrote:

> Hello everyone,
>
> Since days I am busy with a rather stupid problem: I recorded several .avi films via a web cam.
> However when I try to open these in ImageJ I get the error message
>
> /An error occured reading the AVI file. Unsupported compresion: 34504d46 'FMP4'
>
> /I have tried to convert the files already several times, but unfortunately the problem remains.
> Does anyone have a suggestion on how I could solve it?
>
> Many thanks already,
> Alex

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