Re: [SoX-users] Mixing in a repeating track into a song

[Wojciech K. <web...@wo...>]

Chris Bagwell wrote:

> On Feb 17, 2008, at 10:10 AM, Wojciech Knapik wrote:
>  
>>   I'm creating a website that will sell music and I need to create
>> various versions of each song provided in wave format. Among other
>> things, I need to create separate versions as previews - they will be
>> the exact same songs as those for sale, only with a lector mixed in,
>> repeating some text once in a while. The thing is, just mixing in the
>> lector track once is not enough - it should repeat periodically until
>> the original track ends, so the trivial soxmix orig.wav lector.wav
>> output.wav won't cut it. How should I go about this ?
>>   We won't be using any DRM, so I want to at least make sure that
>> cutting the lector out won't be easy. Audio manipulation is completely
>> beyond my expertise, so any hints on how to achieve this and perhaps
>> what additional options would make sense, would be greatly  
>> appreciated.
>>
>> PS. I decided to do that on wave level and then generate mp3 and ogg
>> versions, but just out of curiosity - would it be feasible to just
>> generate the mp3/ogg files and mix in the lector on the fly ? I have a
>> 2x Quad Core Xeon, 4GB RAM and 6x300GB SAS 15krpm disks in a RAID10 at
>> my disposal.
>  
> Nothing builtin. A suggestion: create a worste case repeating audio  
> file of like 5 minutes. Then mix it into the audio file but use the  
> trim option to trim to only original file length. Use the "stat"  
> effect to find file length.

Ah. I guess that should do it. Thanks a lot!
And what about the two other things - preventing the lector from being
cut out and on-the-fly generation ? Any comments/hints ?

cheers,
Wojtek