Hi,
I'm trying to encode and transfer raw video frames over LAN (100 Mbps) connection (frames captured by a web cam). What video/image encoding format is recommended for fast compression (with not much regard for the compression ratio) ?
Thanks,
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33answers:
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A:
If you need individual frames to be independent of one another, use mjpeg (which is equivalent to encoding each frame as a jpeg). It's simple and you have plenty of tools with which to manipulate it.
Otherwise, as long as you have a remotely modern cpu and the resolution isn't insanely high, just use a simple mpeg4 asp or even h264 profile. Encoding 320x240 video with the simplest profile should take less than 5% cpu on a current low-end machine.
R..
2010-10-23 19:37:00
Thanks R. Unfortunately mjpeg/jpeg compression seem to result in lower framerate . Encoding each frame as PNG seem to move the rate upto 11 fps. Still looking for ways to compress faster :(.
ivymike
2010-10-24 12:27:49
Something's wrong if it's taking that long. Which library are you using to do the compression?
R..
2010-10-24 19:35:49
Hi R. I'm using the Gdiplus (Image class) for quick conversion between pixel data to other formats. It can hardly perform 3 jpeg conversions/sec (for a 1024x768 size frame with true color).
ivymike
2010-10-25 10:17:58
Then this is your problem. Inefficient libs like that might work for 160x120 or maybe even 320x240, but for high resolution you really need to switch to `libavcodec`. One way you can tell your library is bad is that it's slower than compressing as png! Any good jpeg implementation should encode at least a few times (if not orders of magnitude) faster than png.
R..
2010-10-25 14:02:59