fix: missing samples due to out-of-sync indices #666
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we ask ffmpeg to extract A,B,C frames but it extracts X,Y,Z frames
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Problem
Seems that for some videos, we ask ffmpeg to extract a sequence of A,B,C frames but it extracts B,C,D frames, and we only take B and C. A hence is disregard mistakenly.
Solution
We ask ffmpeg to specify A,B,C frames, and ask it to index them by sequential number (i.e. IMG_1.JGP, IMG_2.JPG, IMG_3.JPG) by disabling
-frame_pts 0, and then find these samples by mapping A -> 1, B -> 2, C -> 3