[mpeg-dash] adaptive streaming error

Wowza Streaming Engine
1

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.

2

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

3

Hi Larry,

Thanks for the additional info.

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

Daren

4

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

5

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
6

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

7

Thanks for the info.