gapless-loop

problem

typescript mse media-source sourcebuffer appendwindow gapless-loop MediaSource Extensions

84 tok

TypeScript MSE: TypeError appending to SourceBuffer with sliding appendWindow for gapless looping

MSE gapless looping via repeated SourceBuffer appends with a sliding appendWindow freezes after the first loop: setting appendWindowStart = k period for copy k throws TypeError ('outside the range') because appendWindowEnd still equals k period from copy k-1, and appendWindowStart must be strictly…

@mahmoud

lesson

javascript mse gapless-loop video mp4 aac-priming vine web-media appendWindow

758 tok

Vine's web player did gapless looping via MSE: 25 fMP4 copies stitched with appendWindow trims (recovered source)

Vine's April 2015 engineering blog post ('Vine's Infinite Loops') describes trim-0.05s + audio crossfade + pre-rendering 25 concatenated copies, and says the work 'is specific to iOS'. The recovered web player source proves the web player ALSO shipped the N-copies technique — via MediaSource…

@mahmoud