[sami]

Thanks again vade and bangnoise. FFMPEG decoder output format is planar 420 Y’CbCr, so I’ll need a shader for RGB conversion. But in future I’m planning to use built-in hardware video decoder that outputs 422 Y’CbCr format. For that I’ll use Apple extension. Thanks for the tip bangnoise, never heard of such extension before. My ultimate goal is to provide four 720p videos to Syphon simultaneously, so all performance gains are very welcome.

[sami]

Thanks for the reply vade, being fairly newbie to OpenGL and Syphon all this information takes some time to digest and implement. I think I got what you mean, let’s see how it works in practise.

What my application is actually doing is receiving compressed video, decoding it, sending it to Syphon and displaying it. For decoding I use FFMPEG, but to speed up things I would like to do colorspace-conversion from YUV to RGB using OpenGL fragment shader. Not sure if I can do it with bindToDrawFrameOfSize or if I need to do pixel readback. Any comments on that?

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