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kuu avatar kuu commented on July 23, 2024

If there are multiple rendition groups, stringify() writes the variants per group.

It can read this file:

    #EXTM3U
    #EXT-X-VERSION:4
    #EXT-X-INDEPENDENT-SEGMENTS
    #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac_high",NAME="English",DEFAULT=YES,URI="aac_high_eng.m3u8"
    #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac_high",NAME="Japanese",DEFAULT=NO,URI="aac_high_jp.m3u8"
    #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac_mid",NAME="English",DEFAULT=YES,URI="aac_mid_eng.m3u8"
    #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac_mid",NAME="Japanese",DEFAULT=NO,URI="aac_mid_jp.m3u8"
    #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac_low",NAME="English",DEFAULT=YES,URI="aac_low_eng.m3u8"
    #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac_low",NAME="Japanese",DEFAULT=NO,URI="aac_low_jp.m3u8"
    #EXT-X-STREAM-INF:BANDWIDTH=6000000,AUDIO="aac_high"
    1080p.m3u8
    #EXT-X-STREAM-INF:BANDWIDTH=3000000,AUDIO="aac_mid"
    720p.m3u8
    #EXT-X-STREAM-INF:BANDWIDTH=1500000,AUDIO="aac_mid"
    540p.m3u8
    #EXT-X-STREAM-INF:BANDWIDTH=1000000,AUDIO="aac_low"
    360p.m3u8

However, it writes like this:

    #EXTM3U
    #EXT-X-VERSION:4
    #EXT-X-INDEPENDENT-SEGMENTS
    #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac_high",NAME="English",DEFAULT=YES,URI="aac_high_eng.m3u8"
    #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac_high",NAME="Japanese",DEFAULT=NO,URI="aac_high_jp.m3u8"
    #EXT-X-STREAM-INF:BANDWIDTH=6000000,AUDIO="aac_high"
    1080p.m3u8
    #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac_mid",NAME="English",DEFAULT=YES,URI="aac_mid_eng.m3u8"
    #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac_mid",NAME="Japanese",DEFAULT=NO,URI="aac_mid_jp.m3u8"
    #EXT-X-STREAM-INF:BANDWIDTH=3000000,AUDIO="aac_mid"
    720p.m3u8
    #EXT-X-STREAM-INF:BANDWIDTH=1500000,AUDIO="aac_mid"
    540p.m3u8
    #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac_low",NAME="English",DEFAULT=YES,URI="aac_low_eng.m3u8"
    #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac_low",NAME="Japanese",DEFAULT=NO,URI="aac_low_jp.m3u8"
    #EXT-X-STREAM-INF:BANDWIDTH=1000000,AUDIO="aac_low"
    360p.m3u8

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xavierlaffargue avatar xavierlaffargue commented on July 23, 2024

No, that’s not my behavior. And I've never seen variants by group in a master playlist HLS in the real life, a correction must be made (I can create a PR).

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kuu avatar kuu commented on July 23, 2024

Can you provide expected/actual manifests and what issue was caused by the actual manifest?
Your first example only has one rendition per group, which looks unrealistic to me.

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xavierlaffargue avatar xavierlaffargue commented on July 23, 2024

With 3 audio rendition group you will see the issue :

File read:

#EXTM3U
#EXT-X-VERSION:4
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio_aacl",NAME="English",DEFAULT=YES,AUTOSELECT=YES,LANGUAGE="eng",CHANNELS="2",URI="eng_aacl.m3u8"
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio_aac",NAME="English",DEFAULT=YES,AUTOSELECT=YES,LANGUAGE="eng",CHANNELS="2",URI="eng_aac.m3u8"
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio_heaac",NAME="English",DEFAULT=YES,AUTOSELECT=YES,LANGUAGE="eng",CHANNELS="2",URI="eng_heaac.m3u8"

#EXT-X-STREAM-INF:BANDWIDTH=8277095,AVERAGE-BANDWIDTH=6670088,CODECS="avc1.640028,mp4a.40.5",RESOLUTION=1920x1080,FRAME-RATE=29.970,AUDIO="audio_aacl"
1080p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.2",RESOLUTION=1280x720,FRAME-RATE=29.970,AUDIO="audio_aacl"
720p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.2",RESOLUTION=858x480,FRAME-RATE=29.970,AUDIO="audio_aacl"
480p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.2",RESOLUTION=480x360,FRAME-RATE=29.970,AUDIO="audio_aacl"
360p.m3u8

#EXT-X-STREAM-INF:BANDWIDTH=8417895,AVERAGE-BANDWIDTH=6810888,CODECS="avc1.640028,mp4a.40.2",RESOLUTION=1920x1080,FRAME-RATE=29.970,AUDIO="audio_aac"
1080p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5094830,AVERAGE-BANDWIDTH=3810268,CODECS="avc1.4D401F,mp4a.40.5",RESOLUTION=1280x720,FRAME-RATE=29.970,AUDIO="audio_aac"
720p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.5",RESOLUTION=858x480,FRAME-RATE=29.970,AUDIO="audio_aac"
480p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.5",RESOLUTION=480x360,FRAME-RATE=29.970,AUDIO="audio_aac"
360p.m3u8

#EXT-X-STREAM-INF:BANDWIDTH=8277095,AVERAGE-BANDWIDTH=6670088,CODECS="avc1.640028,mp4a.40.1",RESOLUTION=1920x1080,FRAME-RATE=29.970,AUDIO="audio_heaac"
1080p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.1",RESOLUTION=1280x720,FRAME-RATE=29.970,AUDIO="audio_heaac"
720p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.1",RESOLUTION=858x480,FRAME-RATE=29.970,AUDIO="audio_heaac"
480p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.1",RESOLUTION=480x360,FRAME-RATE=29.970,AUDIO="audio_heaac"
360p.m3u8

Actual :

#EXTM3U
#EXT-X-VERSION:4
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio_aacl",NAME="English",DEFAULT=YES,AUTOSELECT=YES,LANGUAGE="eng",CHANNELS="2",URI="eng_aacl.m3u8"
#EXT-X-STREAM-INF:BANDWIDTH=8277095,AVERAGE-BANDWIDTH=6670088,CODECS="avc1.640028,mp4a.40.5",RESOLUTION=1920x1080,FRAME-RATE=29.970,AUDIO="audio_aacl"
1080p.m3u8
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio_aac",NAME="English",DEFAULT=YES,AUTOSELECT=YES,LANGUAGE="eng",CHANNELS="2",URI="eng_aac.m3u8"
#EXT-X-STREAM-INF:BANDWIDTH=8417895,AVERAGE-BANDWIDTH=6810888,CODECS="avc1.640028,mp4a.40.2",RESOLUTION=1920x1080,FRAME-RATE=29.970,AUDIO="audio_aac"
1080p.m3u8
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio_heaac",NAME="English",DEFAULT=YES,AUTOSELECT=YES,LANGUAGE="eng",CHANNELS="2",URI="eng_heaac.m3u8"
#EXT-X-STREAM-INF:BANDWIDTH=8277095,AVERAGE-BANDWIDTH=6670088,CODECS="avc1.640028,mp4a.40.1",RESOLUTION=1920x1080,FRAME-RATE=29.970,AUDIO="audio_heaac"
1080p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.2",RESOLUTION=1280x720,FRAME-RATE=29.970,AUDIO="audio_aacl"
720p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.2",RESOLUTION=858x480,FRAME-RATE=29.970,AUDIO="audio_aacl"
480p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.2",RESOLUTION=480x360,FRAME-RATE=29.970,AUDIO="audio_aacl"
360p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5094830,AVERAGE-BANDWIDTH=3810268,CODECS="avc1.4D401F,mp4a.40.5",RESOLUTION=1280x720,FRAME-RATE=29.970,AUDIO="audio_aac"
720p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.5",RESOLUTION=858x480,FRAME-RATE=29.970,AUDIO="audio_aac"
480p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.5",RESOLUTION=480x360,FRAME-RATE=29.970,AUDIO="audio_aac"
360p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.1",RESOLUTION=1280x720,FRAME-RATE=29.970,AUDIO="audio_heaac"
720p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.1",RESOLUTION=858x480,FRAME-RATE=29.970,AUDIO="audio_heaac"
480p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.1",RESOLUTION=480x360,FRAME-RATE=29.970,AUDIO="audio_heaac"
360p.m3u8

from hls-parser.

kuu avatar kuu commented on July 23, 2024

The current version of stringify() actually generates the following playlist:

#EXTM3U
#EXT-X-VERSION:4
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio_aacl",NAME="English",DEFAULT=YES,AUTOSELECT=YES,LANGUAGE="eng",CHANNELS="2",URI="eng_aacl.m3u8"
#EXT-X-STREAM-INF:BANDWIDTH=8277095,AVERAGE-BANDWIDTH=6670088,CODECS="avc1.640028,mp4a.40.5",RESOLUTION=1920x1080,FRAME-RATE=29.970,AUDIO="audio_aacl"
1080p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.2",RESOLUTION=1280x720,FRAME-RATE=29.970,AUDIO="audio_aacl"
720p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.2",RESOLUTION=858x480,FRAME-RATE=29.970,AUDIO="audio_aacl"
480p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.2",RESOLUTION=480x360,FRAME-RATE=29.970,AUDIO="audio_aacl"
360p.m3u8
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio_aac",NAME="English",DEFAULT=YES,AUTOSELECT=YES,LANGUAGE="eng",CHANNELS="2",URI="eng_aac.m3u8"
#EXT-X-STREAM-INF:BANDWIDTH=8417895,AVERAGE-BANDWIDTH=6810888,CODECS="avc1.640028,mp4a.40.2",RESOLUTION=1920x1080,FRAME-RATE=29.970,AUDIO="audio_aac"
1080p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5094830,AVERAGE-BANDWIDTH=3810268,CODECS="avc1.4D401F,mp4a.40.5",RESOLUTION=1280x720,FRAME-RATE=29.970,AUDIO="audio_aac"
720p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.5",RESOLUTION=858x480,FRAME-RATE=29.970,AUDIO="audio_aac"
480p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.5",RESOLUTION=480x360,FRAME-RATE=29.970,AUDIO="audio_aac"
360p.m3u8
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio_heaac",NAME="English",DEFAULT=YES,AUTOSELECT=YES,LANGUAGE="eng",CHANNELS="2",URI="eng_heaac.m3u8"
#EXT-X-STREAM-INF:BANDWIDTH=8277095,AVERAGE-BANDWIDTH=6670088,CODECS="avc1.640028,mp4a.40.1",RESOLUTION=1920x1080,FRAME-RATE=29.970,AUDIO="audio_heaac"
1080p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.1",RESOLUTION=1280x720,FRAME-RATE=29.970,AUDIO="audio_heaac"
720p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.1",RESOLUTION=858x480,FRAME-RATE=29.970,AUDIO="audio_heaac"
480p.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=5235630,AVERAGE-BANDWIDTH=3951068,CODECS="avc1.4D401F,mp4a.40.1",RESOLUTION=480x360,FRAME-RATE=29.970,AUDIO="audio_heaac"
360p.m3u8

Dis you observe any playback issue with the above playlist?
Or, did you see a playlist written differently by some products?

from hls-parser.

kuu avatar kuu commented on July 23, 2024

BTW, the playlist examples in the HLS spec suggest 2 patterns of multiple rendition groups:

   #EXTM3U
   #EXT-X-MEDIA:TYPE=VIDEO,GROUP-ID="low",NAME="Main", \
      DEFAULT=YES,URI="low/main/audio-video.m3u8"
   #EXT-X-MEDIA:TYPE=VIDEO,GROUP-ID="low",NAME="Centerfield", \
      DEFAULT=NO,URI="low/centerfield/audio-video.m3u8"
   #EXT-X-MEDIA:TYPE=VIDEO,GROUP-ID="low",NAME="Dugout", \
      DEFAULT=NO,URI="low/dugout/audio-video.m3u8"

   #EXT-X-STREAM-INF:BANDWIDTH=1280000,CODECS="...",VIDEO="low"
   low/main/audio-video.m3u8

   #EXT-X-MEDIA:TYPE=VIDEO,GROUP-ID="mid",NAME="Main", \
      DEFAULT=YES,URI="mid/main/audio-video.m3u8"
   #EXT-X-MEDIA:TYPE=VIDEO,GROUP-ID="mid",NAME="Centerfield", \
      DEFAULT=NO,URI="mid/centerfield/audio-video.m3u8"
   #EXT-X-MEDIA:TYPE=VIDEO,GROUP-ID="mid",NAME="Dugout", \
      DEFAULT=NO,URI="mid/dugout/audio-video.m3u8"

   #EXT-X-STREAM-INF:BANDWIDTH=2560000,CODECS="...",VIDEO="mid"
   mid/main/audio-video.m3u8

   #EXT-X-MEDIA:TYPE=VIDEO,GROUP-ID="hi",NAME="Main", \
      DEFAULT=YES,URI="hi/main/audio-video.m3u8"
   #EXT-X-MEDIA:TYPE=VIDEO,GROUP-ID="hi",NAME="Centerfield", \
      DEFAULT=NO,URI="hi/centerfield/audio-video.m3u8"
   #EXT-X-MEDIA:TYPE=VIDEO,GROUP-ID="hi",NAME="Dugout", \
      DEFAULT=NO,URI="hi/dugout/audio-video.m3u8"

   #EXT-X-STREAM-INF:BANDWIDTH=7680000,CODECS="...",VIDEO="hi"
   hi/main/audio-video.m3u8

   #EXTM3U
   #EXT-X-CONTENT-STEERING:SERVER-URI="/steering?video=00012", \
      PATHWAY-ID="CDN-A"
   #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="A",NAME="English",DEFAULT=YES, \
      URI="eng.m3u8",LANGUAGE="en",STABLE-RENDITION-ID="Audio-37262"
   #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="B",NAME="ENGLISH",DEFAULT=YES, \
      URI="https://b.example.com/content/videos/video12/eng.m3u8", \
      LANGUAGE="en",STABLE-RENDITION-ID="Audio-37262"
   #EXT-X-STREAM-INF:BANDWIDTH=1280000,AUDIO="A",PATHWAY-ID="CDN-A", \
      STABLE-VARIANT-ID="Video-128"
   low/video.m3u8
   #EXT-X-STREAM-INF:BANDWIDTH=7680000,AUDIO="A",PATHWAY-ID="CDN-A", \
      STABLE-VARIANT-ID="Video-768"
   hi/video.m3u8
   #EXT-X-STREAM-INF:BANDWIDTH=1280000,AUDIO="B",PATHWAY-ID="CDN-B", \
      STABLE-VARIANT-ID="Video-128"
   https://backup.example.com/content/videos/video12/low/video.m3u8
   #EXT-X-STREAM-INF:BANDWIDTH=7680000,AUDIO="B",PATHWAY-ID="CDN-B", \
      STABLE-VARIANT-ID="Video-768"
   https://backup.example.com/content/videos/video12/hi/video.m3u8

Though the spec does not state which pattern is correct, I'm open to discuss based on the examples in real life.
Please let me know if you observe any issues with the current behavior.

from hls-parser.

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