ffmpuzzle
Puzzle #1 · Standard · 5 params

H.265 · CRF 23 · 1080p · AAC · MP4

The scenario

Default OTT delivery profile for a European SVOD platform. H.265 for bandwidth savings on Smart TVs, CRF 23 as the sweet spot quality/size, AAC for universal device compat, MP4 with faststart for progressive download.

The answer

Video CodecH.265
CRF23
Resolution1080p
AudioAAC
ContainerMP4

The command

ffmpeg -i input.mov -c:v libx265 -crf 23 -c:a aac -movflags +faststart output.mp4

Why

The -movflags +faststart flag moves the moov atom to the beginning of the file, enabling progressive download. Without it, the entire file must download before playback starts.

Puzzle by Jan Ozer

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