Duration issue when streaming large MP3 files

[revital]

When we stream large MP3 files (1 hour or more) the duration of the stream is greater than it actually is (as reported by our own application and by QuickTime/Windows Media Player/VLC).
The duration difference seems to be relative to the length of the media, for example an mp3 with duration of about 50 is 2 seconds longer than expected, where for an mp3 with duration of 1:33:46 we get extra 13 seconds.
This is an issue for us since we wrote our own player and we base our slider position to frame mapping on the duration of the media that we get.
If we scrub the playhead to the end of the file, it seems that the stream continues even-though the playhead has reached the slider end.

Please help us resolve this issue.

[rrlanham]

Do you get the same problem with the same file(s) using the Wowza Flash example player SimpleVideoStreaming or with JW Player?

Richard

[charlie]

Try adding the following property the MediaReader/Properties on conf/[application]/Application.xml:

<Property>
	<Name>calculateMoreAccurateFrameWindow</Name>
	<Value>true</Value>
	<Type>Boolean</Type>
</Property>

Charlie

[revital]

Do you get the same problem with the same file(s) using the Wowza Flash example player SimpleVideoStreaming or with JW Player?

Richard

I've tried with Adobe Flash Media Server's sample video player and it showed the long (wrong) duration
The Wowza Flash example does not show the file duration.

[revital]

Try adding the following property the MediaReader/Properties on conf/[application]/Application.xml:

<Property>
	<Name>calculateMoreAccurateFrameWindow</Name>
	<Value>true</Value>
	<Type>Boolean</Type>
</Property>

Charlie

Adding this property had no effect.
It may be worth mentioning that the file for which we're having a problem is a 44.1KHz file and not 48KHz

[lisa_w]

Would you send a zip of [install-dir]/conf and logs directories, along with one of the files that exhibit the problem so we can look into this some more. A short video is fine. Please reference this thread in your email to support@wowza.com.

-Lisa

[daren_j]

For others with this problem, this is the resolution:

Make sure you are on a recent Wowza release (3.1.0 or greater) and add these properties in your
/conf/[AppName]/Application.xml to the MediaReader/Properties container:

<Property> 
   <Name>calculateMoreAccurateFrameSize</Name> 
   <Value>true</Value> 
   <Type>Boolean</Type> 
</Property> 
<Property> 
   <Name>calculateMoreAccurateFrameWindow</Name> 
   <Value>200</Value> 
   <Type>Integer</Type> 
</Property>