CODEWITHSUNDEEP
videoffmpeghttp-live-streaming
David542
David542

Reputation: 110083

FFmpeg hls from multiple files

I am trying to create an HLS playlist with multiple audio streams. I have the following files:

- videoHD.mp4
- videoSD.mp4
- audioEN.mp4
- audioFR.mp4
- audioIT.mp4

How would I transmux these all together in an ffmpeg command to create an HLS playlist?

Upvotes: 2

Views: 8039

Answers (1)

aergistal
aergistal

Reputation: 31209

Update January 2018

You can now create master playlists directly with FFmpeg using master_pl_name and var_stream_map. See the documentation.

According to the Apple docs you don't mux them all together and you can't use a single HLS playlist.

You need playlists for each video and each audio track (eg: hd/playlist.m3u8, sd/playlist.m3u8, en/playlist.m3u8 etc.) and a master playlist to link them all together. The master playlist controls the playback.

Here's an example with two video qualities and three audio tracks from the docs:

#EXTM3U
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio",LANGUAGE="eng",NAME="English",AUTOSELECT=YES, \
DEFAULT=YES,URI="eng/prog_index.m3u8"
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio",LANGUAGE="fre",NAME="Français",AUTOSELECT=YES, \
DEFAULT=NO,URI="fre/prog_index.m3u8"
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio",LANGUAGE="sp",NAME="Espanol",AUTOSELECT=YES, \
DEFAULT=NO,URI="sp/prog_index.m3u8"

#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=195023,CODECS="avc1.42e00a,mp4a.40.2",AUDIO="audio"
lo/prog_index.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=591680,CODECS="avc1.42e01e,mp4a.40.2",AUDIO="audio"
hi/prog_index.m3u8

ffmpeg didn't support variant playlists the last time I checked so you need to create each alternate playlist individually and manually create the master playlist.

Of course for all this to work the individual streams must be aligned or you'll have a lot of synchronization issues. You can try using ffmpeg with multiple I/O:

ffmpeg -i input1 -i input2 \
    -map … -acodec … -vcodec … output1 \
    -map … -acodec … -vcodec … output2 \
    -map … -acodec … -vcodec … output3

each output being of type HLS.

Sources:

About HTTP Live Streaming

Technical Note TN2288

FFmpeg - Creating Multiple Outputs

Upvotes: 6

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