YouTube system design - ByteByteGo | Technical Interview Prep
: Utilize the MP4 container's ability to store Extensible MetaData Platform (XMP) data to embed searchable tags and subtitles directly into the file. 4. Cross-Platform Player Compatibility
If you are developing for specific hardware like Android or Apple devices, ensure technical feature parity:
: Use front-camera data to detect a user's facial expressions (like smiles or surprise) to automatically bookmark "interesting" segments of the MP4.
: When embedding the video on a web feature, ensure the MP4 source is listed first in your tag to avoid playback issues on iOS devices.