100GB .avi

Friday, 11/16/2007 -- by Niels Engdahl Jensen. Subject: 100GB .avi

Hello Everybody

In IC3 I am making an application with a crawl containing a .txt file with 149 lines. It is crawling with a speed of 1 pixel pr step. 6 frames per pixel and 1 pixel per gap. Typesize is 35 and the crawl size is 800x1024.
Then I publish it as a video. The size of the .avi file will be maybe 100 GB!!!.
Then I convert it to mpeg1 which will be 0.5GB - 1GB.
The mpeg will be shown by a hardware flash player directly to a 1280x1024 LCD PC monitor (no PC).
Maybe I am doing it wrong or in a stupid way. Is it nescesary to make such a big .avi file just to show 30 pages from a book?

Monday, 11/19/2007 -- by John Schilling. Subject: Well--you could use an AVI format besides RAW...

You are likely using RAW32 as your publishing format.

Advantages: Minimal CPU use.

Disadvantages: Q.E.D.

You might find a lossless CODEC such as HUFFYUV is an appropriate compromise--file size/CPU%.

--JSS

Monday, 11/19/2007 -- by Niels Engdahl Jensen. Subject: 100GB .avi

In the Publish Video ->Advanced menu I can choose between:
   uncompressed RGB
   DV Video Encoder
   ffdshow video encoder
   LEAD MCMP/MJPEGCodec
   MJPEG Compressor
   and several others
I am rather sure, I chose "MJPEG Compressor".
I can't see RAW32. Is it the same as "uncompressed RGB"?
What is Q.E.D?
I am going to try Huffy.

--NEJ

Tuesday, 11/20/2007 -- by John Schilling. Subject: Obviously you did not have High School Latin or Logic...

Q.E.D. == "quod erat demonstrandum"

"Uncompressed RGB" == "RAW32" == 32-bits per pixel == 8-bits of Red, 8-bits of Green, 8-bits of Blue, 8-bits of Alpha == 32-bits x 640 x 480 x 30 Frames per second == 294912000 bits/second. [divide by 8 to get bytes] == 36864000 == 36.864 MB/sec. [== Niels has a 100GB file on his hands!]

This is on of the reasons why CODEC's were invented.

With MPEG-2 one can represent this video stream, to very good quality, using only 0.6-0.8 MB/sec. With WMV9 or MPEG-4--in 0.3-0.5 MB/sec. [however MPEG video encoding is very CPU-expensive and so it not something one generally can do in "real time" at good quality without dedicated HW]

Depending on options, HUFFYUV will get the RAW32 rate down to between 9 and 18 MB/sec--between 1/4 and 1/2 the final size of the "RAW" file. Since its not very CPU-expensive, it is a good compromise.

--JSS

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