Smooth Streaming Chunk Duration Target

Wowza Streaming Engine
1

Hello Wowza,

Is the smooth streaming chunk duration configurable like a mpegdashChunkDurationTarget?

I tried to set “smoothChunkDurationTarget” to 2000 and mp4 GOP to 1 sec as a factor of the chunk duration. But the result chunk size seems to be only 1 sec, not twice the size of GOP.

Best regards,

Tomonori

2

Hi,

Yes, but the property names are different. The following guide lists the properties used for SmoothStreaming Packetization.

The one you are interested in is smoothManifestTargetDuration.

Daren

3

I don’t typically utilize Smooth Streaming for VOD playback, but I have a client who’s targeting a setup box that supports DRM over Smooth Streaming only. I haven’t enabled DRM on the test stream, but the GoP size is 2 seconds and the video playback shows artifacting and reports errors in the log. VLC can’t play the stream “smoothly” either, but a variety of desktop browser-based Silverlight players have no issues playing the stream.

4

Hi,

There really isn’t a equivalent for VOD smooth streaming. What is the intended result?

With Smooth streaming it’s important to keep the Keyframe interval down to 4 seconds or below,

with 2 seconds being more preferable. So encoded files to be played in Smooth Streaming players

should adhere to this.

Daren

5

Hello Daren,

I would like to configure VOD chunk duration, not Live.

I tried to add the smoothManifestTargetDuration property to the / and also to the / like the mpegdash. But the both did not affect to VOD streams.

Would you let me know how to configure smoothManifestTargetDuration for VOD?

Best regards,

Tomonori

6

Thank you Daren,

We had tested keyframe interval 1 second and 2 seconds. And found another problem at 1 second with non-PC device.

So, we choose 2 seconds for keyframe interval. Then the smooth streaming chunk size also be 2 seconds that I indended.

Tomonori

7

Hello,

Can you post examples of the errors in the log that you are seeing?

Regards,

Jason Hatchett