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Yuriy_OM
Level 7

SceneGraph Video - no audio with this m3u8 manifest

Hi Everyone,

Can someone take a look at this maifest file and let me know if you have any ideas why audio would not play. I am using SceneGraph Video node, and when trying to play this HLS manifest, there is no audio ( audio is a separate stream here). If audio is enbedded in video TS, everything works, but if audio is separate - no audio.


#EXTM3U
#EXT-X-VERSION:4
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="Audio1",NAME="mp4a.40.5_63K_Undetermined",LANGUAGE="und",DEFAULT=YES,AUTOSELECT=YES,URI="A1.m3u8"
#EXT-X-STREAM-INFSmiley TongueROGRAM-ID=1,BANDWIDTH=7100000,CODECS="avc1.640029,mp4a.40.5",AUDIO="Audio1",RESOLUTION=1920x1080
01.m3u8
#EXT-X-I-FRAME-STREAM-INFSmiley TongueROGRAM-ID=1,BANDWIDTH=91000,RESOLUTION=1920x1080,URI="01IF.m3u8"
#EXT-X-STREAM-INFSmiley TongueROGRAM-ID=1,BANDWIDTH=4388000,CODECS="avc1.640029,mp4a.40.5",AUDIO="Audio1",RESOLUTION=1280x720
02.m3u8
#EXT-X-I-FRAME-STREAM-INFSmiley TongueROGRAM-ID=1,BANDWIDTH=1000,RESOLUTION=1280x720,URI="02IF.m3u8"
#EXT-X-STREAM-INFSmiley TongueROGRAM-ID=1,BANDWIDTH=3082000,CODECS="avc1.4d0029,mp4a.40.5",AUDIO="Audio1",RESOLUTION=1280x720
03.m3u8
#EXT-X-I-FRAME-STREAM-INFSmiley TongueROGRAM-ID=1,BANDWIDTH=101000,RESOLUTION=1280x720,URI="03IF.m3u8"
#EXT-X-STREAM-INFSmiley TongueROGRAM-ID=1,BANDWIDTH=2881000,CODECS="avc1.640029,mp4a.40.5",AUDIO="Audio1",RESOLUTION=1280x720
04.m3u8
#EXT-X-I-FRAME-STREAM-INFSmiley TongueROGRAM-ID=1,BANDWIDTH=94000,RESOLUTION=1280x720,URI="04IF.m3u8"
#EXT-X-STREAM-INFSmiley TongueROGRAM-ID=1,BANDWIDTH=2275000,CODECS="avc1.4d0028,mp4a.40.5",AUDIO="Audio1",RESOLUTION=864x486
05.m3u8
#EXT-X-I-FRAME-STREAM-INFSmiley TongueROGRAM-ID=1,BANDWIDTH=74000,RESOLUTION=864x486,URI="05IF.m3u8"
#EXT-X-STREAM-INFSmiley TongueROGRAM-ID=1,BANDWIDTH=1472000,CODECS="avc1.4d001f,mp4a.40.5",AUDIO="Audio1",RESOLUTION=640x360
06.m3u8
#EXT-X-I-FRAME-STREAM-INFSmiley TongueROGRAM-ID=1,BANDWIDTH=47000,RESOLUTION=640x360,URI="06IF.m3u8"
#EXT-X-STREAM-INFSmiley TongueROGRAM-ID=1,BANDWIDTH=666000,CODECS="avc1.4d001f,mp4a.40.5",AUDIO="Audio1",RESOLUTION=640x360
07.m3u8
#EXT-X-I-FRAME-STREAM-INFSmiley TongueROGRAM-ID=1,BANDWIDTH=20000,RESOLUTION=640x360,URI="07IF.m3u8"
#EXT-X-STREAM-INFSmiley TongueROGRAM-ID=1,BANDWIDTH=63000,CODECS="mp4a.40.5",AUDIO="Audio1"
A1.m3u8
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17 Replies
Roku Employee
Roku Employee

Re: SceneGraph Video - no audio with this m3u8 manifest

So from my experience it is necessary for HLS that the audio be part of the .ts file – a separate audio stream is usually also included for low-bandwidth situations, as an additional bitrate variant, which the device will switch to if the bandwidth is too low for video.

Conversely MPEG-DASH needs to have the video and audio separate, as I understand it, to work properly on our platform.

Joel
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Yuriy_OM
Level 7

Re: SceneGraph Video - no audio with this m3u8 manifest

Hi Joel,

Are you sure about this? m3u spec states that "EXT-X-MEDIA:TYPE=AUDIO" may be part of video TS or a separate stream ( to support multiple languages/audio qualities ). If the "URI=" field is left blank, it implies that audio is within video TS, if URI is set, then audio is a separate stream.

Would you be able to run it by the dev team and find out for sure if separate audio tracks are supported or this is a SceneGraph bug?

FYI, this is what wowza says about it (supporting separate audio tracks): https://www.wowza.com/forums/content.ph ... LS-streams
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RokuRobB
Level 7

Re: SceneGraph Video - no audio with this m3u8 manifest

Yuriy, can you send the URL of the manifest for us to try out?
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Yuriy_OM
Level 7

Re: SceneGraph Video - no audio with this m3u8 manifest

Hi Rob,

Unfortunately the manifest is not publicly accessible now, but I can set it up for you if you can answer this question first: is Roku supposed to support non-interleaved audio (separate audio tracks)? The manifest is formatted according to HLSv4

Thanks
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Yuriy_OM
Level 7

Re: SceneGraph Video - no audio with this m3u8 manifest

Can someone please shed some light onto this? Does roku support separate audio streams or not?
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Yuriy_OM
Level 7

Re: SceneGraph Video - no audio with this m3u8 manifest

bump bump
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Yuriy_OM
Level 7

Re: SceneGraph Video - no audio with this m3u8 manifest

Hi Roku Team,

Can you please help your development community and start answering questions? I feel there is a real "lack of support" going on here! We are developers trying to use your product and make it better, I hope you realize that this type of "participation" will not do the project any good and will deter future developers from getting engaged. I think everyone will agree that there is nothing worse in the dev world to be stuck with a problem without any official support nor comments nor roadmap. Please help us to help you!
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Roku Employee
Roku Employee

Re: SceneGraph Video - no audio with this m3u8 manifest

The official superficial answer is "Yes" we do support non-interleaved audio, but I'm waiting for more details from the media team.

- Joel
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Yuriy_OM
Level 7

Re: SceneGraph Video - no audio with this m3u8 manifest

Thank you so much for the reply, at least now I know there is a chance to fix my problems!

So I guess this might not work due to the manifest format or Scene Graph bug?

Waiting anxiously for your reply
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