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6) have I-Frames in coincidence with IDR Frames
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Or just not set the keyframe flag on non-IDR I-frames, just like you do in any other container. If keyframes are set incorrectly, that's just a bug in x264vfw, not a limitation of VfW.
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Originally Posted by Sharktooth
3) works but it's a hackery... also do not set too much reference frames when trying to use this option...
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Number of reference frames has nothing to do with any of the limitations of VfW or AVI. The fact that you can use multiple reference frames is what promped H.264 to distinguish between I-frames and IDR-frames. But if you treat keyframes correctly, then it doesn't matter to AVI whether you use 1 ref or 16. And B-pyramid exacerbates the general B-frame problems because it increases the amount of re-ordering, not because it adds referenced B-frames.