Music fade out (playlists) cuts the start of media tracks coming in through SIP

[victor-nitu]

We have a program only a few seconds long, dropped in the middle of a playlist. This is what happens:

• music plays
• there's a "hiccup" artefact in the playback, like a split second silence
• fade out begins
• once the fade out stops, the program coming in through SIP gets played from the beggining + the duration of the fade out
• as a result, the media file played in the program is shortened from the beginning

A possible solution for this would be to start playing the SIP call only with a $fade_out_duration delay.

[judelove]

This is possible for non-sip calls. The new implementation for fadeout on GSM calls however takes care of this. If the file is silent at the beginning, this is an issue of the audio quality potentially overloading the codec quality. (This happens alot, for example with IVR prompts sometimes they will be truncated as we saw on the call with Dan and Adi)