6/23/2023 0 Comments Mp4 to hls![]() If you look at the playlist, the location of each segment is specified as a byte offset in the file. Instead of creating several (smaller) files, it will create a single file containing all the media segments. To use this feature with fMP4, set the -hls_flags option to single_file. The other difference is the file extension of the segments is. A playlist containing an MPEG-2 transport stream can also apply the #EXT-X-MAP tag, but each segment typically includes the information required to parse it so it’s not needed. It applies to every segment that appears after it. The #EXT-X-MAP tag specifies the location of the resource that contains the information required to parse the segments (the media initialization section). Let’s take a look at the playlist and see how it compares: #EXTM3U You’ll need all of these files when you come to play the video. ![]() The above command will generate the following files: the playlist file ( prog_index.m3u8), a number of files with the extension. To generate fMP4 files instead of MPEG-TS, which is the default, set the segment type to fmp4 (highlighted). hls_segment_filename "fileSequence%d.m4s" \ force_key_frames "expr:gte(t,n_forced*2)" \ Open up a terminal and run the following command: ffmpeg -y \ ![]() We’ll alter the size to 1280×720 and reduce the video bitrate but leave the audio as it is. Let’s take the original video ( sintel_trailer-1080p.mp4) and re-encode it. You’ll need a fairly recent version of ffmpeg that supports fMP4 – I used version 4.1.1 to create the files in this post.įor the video, I used the 1080p version of the Sintel trailer. In this post, I’ll demonstrate how to generate fMP4 files using ffmpeg. This means less encoding and less storage requirements, which should reduce costs. Fragmented MP4 files are also compatible with MPEG-DASH – an alternative to HLS – so you can use the same files only the manifest file (playlist) is different. So why use fragmented MP4 files? Well, according to Apple’s video encoding requirements in their HLS Authoring Specification, if you want to use HEVC/H.265, you have to use it (1.5). At WWDC 2016, Apple announced support for fragmented MP4 (fMP4) as an alternative to MPEG-TS, which prior to their announcement was the only supported format.
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