Lossless export of still images from a Pinnacle miroDC series compressed avi files using AVIedit
Probably you have read our another article about simple
export of frames from an avi files. So, what's new for you
When you use the frames online (i.e. on a web site) they most likely
will be saved in JPEG format. This is because it is most suitable
format to photo-realistic images (unlike drawing, line art or CG).
However, Pinnacle miro series does
a hardware video compression that is very similar to
JPEG we finally would have. When you use any conventional nle software
that allows export of stills, it always does decompression of a frames
to Windows DIB format (internally), then it saves the format you requested to.
In worst case we will finish up with two lossy operations, decoding
from MJPG to DIB (bitmap), then encoding to target format (JPEG).
AVIedit eliminates both the intermediate (de)compression operations, thus
preserving the original (tape) video quality.
The only limitation of the method we used is that clip should be encoded
using Motion-JPEG (MJPG) codec (that supported also by Matrox capture
cards and by few software codec developers). However, for Pinnacle DC
series users this shouldn't be a kind of limitation.
So, lets start with step-by-step guide.
That's all. You got a really non-recompressed jpeg file.
Open an AVI file
Click inside the desired frame rectangle to select it
Use File/Export/MJPG->jpg menu item to get this frame as a separate image file
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