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James
a4c4b2ff03
When the distributed render path stitches chunks with `-c copy`, ffmpeg averages the container framerate from PTS rather than carrying the source's exact rational rate, producing values like `360000/12001` instead of `30/1` and ~5ms duration drift over 60s. This is a known ffmpeg behavior at the concat-demuxer-copy boundary. The industry-standard fix is `-r <fps>` as an input flag on the concat step plus an output flag on the subsequent mux step — both with `-c copy` retained, no re-encode required. Three sites updated: - `assemble.ts` concat step: `-r <fps>` input flag. - `chunkEncoder.muxVideoWithAudio`: `-r <fps>` output flag. - `chunkEncoder.applyFaststart`: same, threaded from caller. Adds `r_frame_rate` + duration-equivalence assertions to `assemble.test.ts` to close the regression hole.