Pure setpts slowdown holds each source frame for the same wall-clock time, which at 25 fps source / 2x means ~12.5 effective fps — felt juddery. Switch to setpts=1.5*PTS (7.4s output) and add minterpolate=fps=50:mi_mode=blend so the encoder generates blended intermediate frames. Result is buttery, slightly faster than the 2x version. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> |
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