This allows video playback to begin before the file has been completely downloaded. Normally, a MP4 file has all the metadata about all packets stored at the end of the file, in data units named atoms. The "mdat" atom is located before the "moov" atom. If the file is created by adding the -movflags faststart option to the ffmpeg command line, the "moov" atom is moved at the beginning of the MP4 file during the ffmpeg second pass. By using this option, the "moov" atom is located before the "mdat" atom. In other words, the file is enabled for Fast Start playback only when the "moov" atom is located before the "mdat" atom. This page is intended for Windows 10 users but can be adapted by Unix users with only small changes. Prior to using the next batch files, Windows users should download grep.exe and head.exe from an Internet site. The first approach is to fully scan the H.264/MP4 files to look for "mdat" and "moov" atoms.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |