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I have say around 150 songs in DTS Format.Audio Codec also DTS. All are DVD compliant 48KHZ, 755 Kbps. What I need to do is add 10 to 15 seconds of silence at the end ,that too in batches because adding one by one for 150 or more songs you know the pain.

What is the software available for batch editing I mean adding silence? There is specific purpose/reason which is must for me . If anybody want to know the reason I don't mind revealing it. No secret.

Need somebody to suggest solution for my issue.

I've been waiting for the author of AudioMuxer to chime in but without input from him I'm not sure you can add/edit a dts stream, without decoded and re-encoding, which would be a lossy process.

Maybe you should share why you need this, in case there is a way around that issue.

Is it because your HT doesn't detect the DTS stream fast enough? What I have found in that case is to not mix DTS with non DTS songs. I have one library for surround and one for stereo.

Another approach, if you want to mix stereo and surround, is to encode your stereo with DTS (2 ch.) or upmix to 5.1 and encode. SpecWeb, offered here, gives a pretty push button upmix solution.

It does not really do any re-encoding. The "fixed" dts file is the source file with the zero padding removed. Surcode for example creates DTS files padded with zeros and these files are for most dvd authoring applications not compatible. For these compatibility reasons the padded zeros are being removed.
Hopefully you can make it work going the 1 large dts route.