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#1 Posted : Saturday, August 12, 2006 8:13:18 AM(UTC)
raygralak

Groups: Registered
Posts: 3


Hello,

I want to be able to embed some binary information (a time stamp) into each frame of a video file as I capture it. I can embed the information by modifying the data in the frame using the callback filter, but I think the data will be altered when the file is run through a codec and saved to disk. Is there a way to keep this data from being altered without saving the file uncompressed?

Thanks,

-Ray 

 

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#2 Posted : Monday, August 14, 2006 6:33:04 PM(UTC)

Amin  
Amin

Groups: Manager, Tech Support
Posts: 356


Ray,
If you use any type of lossy compression, the data will be modified in a way that does not guarantee reversing when it is decompressed.
You could try a lossless compression format, but generally the size reduction is not close to the good lossy formats such as H264 and MPEG4.
You could come up with an approach that's 'loss-resistant'. The idea is to set certain pixel values to represent the numbers you want, and make different number values fairly distinct from each other. A lossy compression algorithm usually makes limited to changes the color and/or intensity information, so if your chosen values are far apart enough, you should be able to retrieve them correctly even if they are shifted during encoding/decoding.

Amin Dodin

Senior Support Engineer
LEAD Technologies, Inc.
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