decompressing AVI

[pdug175]

I was wondering does encoding a decompressed AVI file improve picture/audio quiality as apposed to using the source AVI file?

[housepig]

what do you mean by a "decompressed" avi?

[pdug175]

I have a programme to extract audio from AVI files called:AVI Audio Decompressor.

It decompresses the file and creates another AVI file about twice the size. I figured that maybe encoding from this file would give me a greater audio and visual quality. When I put the files in AVIcodec I notice that the orginal AVI has an audio quality of 96kps/128kps and the decompressed that similar to CD 14kbs or summit.

I was just curious as to which to encode from.

[housepig]

go from the original - decompressing* an already compressed file is not going to increase the quality at all. If you had a choice between 2 avi files, and one was captured with a lower-compression codec (ie a Huffyuv file vs a Divx file) encode from the one that had less compression.

(* I have no idea what the software you mentioned is actually doing to the file, I'm not familiar with it).

think about it like this. You scan an 5x7 picture on a scanner. You resize the image down to the size of a postage stamp. Now you want another version sized at 2x3.

If you resize the original 5x7 to 2x3, you will get better results. If you blow up the postage-stamp sized one to 2x3, all the detail that was originally in the file has been lost, and the computer has to guess what colors to add in, and where.

it sounds like the program you are using is resampling the original file to conform to some other existing standard - like "decompressing" an mp3 to a .wav file to burn it as an audio disc - you aren't increasing quality, you're just converting the data into the format required for the audio disc....