Why won't some MP4 videos start streaming until the entire file is downloaded?

I had this problem with some MP4 videos as well. I was converting uploaded videos to mp4 (h.264 + aac) and they wouldn't buffer. The reason is that this format contains some important metdata required for the playback at the end of the file, hence the entire file has to be loaded before the playback can start.

The solution was to use a tiny program called qt-faststart ( https://github. Com/danielgtaylor/qtfaststart ) on the result of the conversion. This program relocates this metadata to the beginning of the file making progressive-download playback possible.

I had this problem with some MP4 videos as well. I was converting uploaded videos to mp4 (h.264 + aac) and they wouldn't buffer. The reason is that this format contains some important metdata required for the playback at the end of the file, hence the entire file has to be loaded before the playback can start.

The solution was to use a tiny program called qt-faststart (https://github. Com/danielgtaylor/qtfaststart) on the result of the conversion. This program relocates this metadata to the beginning of the file making progressive-download playback possible.

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