Video streams, but no audio (mp4/aac)

[video-dev]

Video streams, but no audio (mp4/aac)

[mangui]

PMT of your fragments does not reference any audio track, although there are some data broadcasted on PID 258 (that looks like audio data)
hence you won't get audio. looks like a transmuxing issue between your MP4 and your HLS stream.
I don't know how IOS can play this. I guess that he is probing unknown content and as it recognized audio on PID 258, it will handle it.
definitely not standard.

[mangui]

closing it, as the stream is not complying with HLS spec (audio not signaled in the PMT)

[janiszie]

Thanks, but how did you checked that stream is not complying HLS spec? I checked with Apple Media stream validator, everything seems fine (no errors) - only some warnings at .ts files like:

1994_576p_1250.mp4Frag94Num94.ts:

           WARNING: Video segment does not contain an IDR frame
           --> Track ID 1

           WARNING: Zero sample count
           --> Track ID 1

Segment bitrate: Average: 1.38 Mbits/sec, Max: 1.62 Mbits/sec
Average segment structural overhead: 79.26 kbits/sec (5.74 %)

Track ID: 1
Video Codec: avc1
H.264 profile: High
H.264 level: 3.1
Video resolution: 1024x576 pixels
Video average IDR interval: 1.231 seconds, Standard deviation: 0.266
Video frame rate: 50.000 fps
Track ID: 2
Video Codec: avc1
H.264 profile: High
H.264 level: 3.1
Video resolution: 1024x576 pixels
Video average IDR interval: 1.231 seconds, Standard deviation: 0.266
Video frame rate: 0.000 fps
Track ID: 3
Audio Codec: AAC-LC
Audio sample rate: 48000 Hz
ACL: Stereo (L R)
Average video bitrate: 1.11 Mbits/sec
Average audio bitrate: 189.29 kbits/sec

[tarkanlar]

I got the same issue when i make livestream with mp3 there was no sound in chrome but there was sound in safari and ios then i switched to acc it worked both chrome and safari but what is wrong with mp3?

[phloxic]

@tarkanlar - the MediaSource extension cannot play MP3, generic HLS can. For hls.js the audio of your streams must be AAC.