Wowza Community

[mpeg-dash] adaptive streaming error

Hi,

My company is using Wowza streaming engine(version 4.1.1) on AWS.

I’ve got some weird problem on the adaptive streaming(mpeg-dash).

The streaming url is following.

http://54.65.203.47:1935/vod/smil:bad.smil/manifest.mpd

Upper streaming video always stops during playing on the wowza test player.

Seems the error occurs at the loading time of the different bit-rate chunk. (from a0r0 to a0r1)

But without smil file always fine.

Following is the console error log on the wowza test player.

Hi,

Each of the files mentioned in your smil file need to be keyframe aligned.

Will the smil playback well using the Adobe HDS test player?

Best regards,

Daren

Hi Larry,

Thanks for the additional info.

Let’s continue troubleshooting this in the ticket you opened, ticket #121813

Daren

Hi Daren,

Thanks for your prompt reply.

It works fine on the Adobe HDS test player with following streaming url.

http://54.65.203.47:1935/vod/smil:bad.smil/manifest.f4m

But I need to play the adaptive mpeg-dash streaming not the HDS streaming on an android app.

I used the FFmpeg for converting and I didn’t add keyint option for setting keyframe interval for each mp4 file.

It might the default value 250.

Even after setting keyint as 250 the error still occurs.

I also found some confusing thing with testing smil file. It always works with smil file that only include each one video.

But the error occurs when I use two videos in one smil file.

  1. high bit-rate only smil - always fine
  1. low bit-rate only smil - always fine
  1. high & low bit-rate smil - always fail
  1. Wowza example - works fine

-Larry

Hi Daren,

Thanks for your concern about this issue.

How can I access the ticket #121813?

Is there any web url for that ticket or should I use just email?

And I also posted new additional info on [mpeg-dash] some adaptive streaming always stop during playing.

  • Larry

It was the problem of keyframe alignment problem.

Finally I could solve this problem with the ‘-sc_threshold 0’ option of FFMpeg.

Refer from Keyframe alignment problem with Wowza and FFMPEG

-Larry

Thanks for the info.