chrome could play html5 mp4 video but html5test said chrome did not support mp4 video codec

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.mp4 is just a container format (MPEG-4 Part 14), the video and audio formats under .mp4 file can be varied. For video, H-264 (MPEG-4 Part 10) and MPEG-4 Visual (MPEG-4 Part 2) are common.

On the HTML5Test, “MPEG-4 support” will test video.canPlayType("video/mp4; codecs="mp4v.20.8"), which tests whether MPEG-4 Visual is supported.

Formats supported by Chrome are H-264, VP8 (WebM video part), Theora for video and MP3, AAC, Vorbis for audio. MPEG-4 Visual is not supported (Chromium issue 54036).

So, Chrome can play .mp4 with H-264 video but not MPEG-4 Visual video.

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