Re: GAP Encoding

Quoting Jason van Gumster <jason@...>:

> I've been working my way through explaining GAP's video encoding
> feature and stumbled across something that I couldn't find any obvious
> documentation to (or figure out on my via trial and error). Basically,
> I'd like to know the difference between the SINGLEFRAMES and RAWFRAMES
> encoder options. The names seem to indicate that RAWFRAMES doesn't
> compress frame data, but if you set your output format to JPEG, the
> compression window appears and the encoder happily compresses each
> frame just as if you'd chosen SINGLEFRAMES.

I'm not certain about this, but I believe that RAWFRAMES is only  
meaningful for the "Storyboard" Input Mode, and then only if the  
source video file includes valid JPEG frames in its format (i.e.,  
MPEG1 I-frames, or MJPEG). For these formats, rather than decode the  
(JPEG) frame into an image and then encode that image back to a JPEG  
file, the video encoder will simply extract the JPEG frame from the  
video stream. This is beneficial from both a speed and quality  
perspective.

If you are not in "Storyboard" Input Mode, encoding is mandated  
regardless of whether you use RAWFRAMES or SINGLEFRAMES.



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