Live Video Transmuxing/Transcoding
summary
FFmpeg works as a quick RTMP-to-HLS solution but causes segment misalignment when mixing transmuxed and transcoded renditions and wastes CPU on redundant scaling; using FFmpeg in one-instance one-in/one-out runs faster for a single 1080p60->720p60 job but stalls as renditions grow. Twitch builds TwitchTranscoder, a custom threaded stack that shares scalers, follows source IDR intervals, serves N variants from one process, and yields higher density on benchmarks for full ladders serving many viewers of the 40,000 concurrent channels scale.
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chapters (6)
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