Hi,
really cool project!

I have a question about the information displayed in Reference Frame under the Block Info tab. I see a number displayed there — does this represent the actual index in the video sequence that the respective motion vectors refer to?

If so, I have a couple of questions:

do you trace the motion vectors back until encountering a DCT/Intra-predicted block? If so, how do you handle ambiguity? For example, if a motion vector is (2.5, 2.5), it lies precisely between four blocks; how do you determine the correct one?

What order of reference frame types do you use? For every type (LAST_FRAME, LAST2_FRAME, LAST3_FRAME, GOLDEN_FRAME, BWDREF_FRAME, ALTREF2_FRAME, ALTREF_FRAME) how do you determine how much into the future/past you need to go?

I tried analyzing the analyzer.bundle.js file by undoing the minification and formatting it, but I couldn’t figure out how it works.