That's not a supported codec.
Recommended Formats for Video Media Playback
We recommend the formats listed below because they have been extensively tested by our team, and demonstrate the best possible performance and cross-platform compatibility:
hap.movhapQ.mov (High Quality)hapA.mov (Alpha Channel)hap.avihapQ.avi (High Quality)hapA.avi (Alpha Channel)photoJPEG.aviphotoJPEG.movApple ProRes 442.mov (macOS only)Apple ProRes 4444.mov (macOS only, Alpha Channel).wmv (Windows only)H264.mp4 (Does not support interactive playback, e.g. reverse speeds or scrubbing)H264.mov (Does not support interactive playback, e.g. reverse speeds or scrubbing)Mp3 - Audio only