-movflags frag_keyframe+empty_moov+default_base_moof : This ensures the file starts with an empty metadata header and sends data in playable chunks.
Unlike a standard MP4 file that requires a complete "moov atom" (metadata header) at the end of the file to be playable, uses Fragmented MP4 (fMP4) . This allows video to be played back as it is being recorded or streamed, making it ideal for: Live Previewing: Real-time camera feeds in web dashboards. live.mp4
To create a streamable live.mp4 , developers typically use: developers typically use: