[linux-audio-user] extract and mix

[Brad Fuller]

Brad Fuller wrote:

> Brad Fuller wrote:
>
>> I couldn't find a way to do this in ecasound, maybe there's a way to 
>> do it. Here's what I want to do:
>>
>> Find the exact length of a audio file in ms. I think ecalength can do 
>> this, I know it's not sample accurate, but I just need down to the 
>> around 1ms. Maybe there's another option other than ecalength.
>>
>> Then, I want to extract a section of another file: at a specific 
>> location in ms at a length of the file above.
>>
>> Then, mix that extracted segment with another file and save the 
>> result to a new file.  How can this be done? I don't know of a 
>> utility that can extract a specific length at a specific location in ms.
>>
>> brad
>>
>>
> I forgot all about sox - looks like I could use sox to essentially 
> extract a section by using the feature "trim start length"

does anyone have any ideas on how I can accomplish this process? Has 
anyone used the "trim" feature in sox?
Also, I like to be able to extract the file section (step 2 above) to 
the nearest zero crossing (to prevent potential clicks). Any pointers, 
even off the top of your head, would be most appreciated.

thanks,
brad <http://www.oreillynet.com/pub/au/2184>