Re: [linux-audio-user] extract and mix

Mark Knecht wrote:

>On 12/19/05, Brad Fuller <brad@email-addr-hidden> wrote:
>
>
>>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.
>>>>
>>>>
>
>sndfile-info?
>
>mark@email-addr-hidden ~ $ sndfile-info Web-music/2AM-40Bars.wav
>
>Version : libsndfile-1.0.11
>
>========================================
>File : Web-music/2AM-40Bars.wav
>Length : 35744300
>RIFF : 35744292
>WAVE
>fmt : 16
> Format : 0x1 => WAVE_FORMAT_PCM
> Channels : 2
> Sample Rate : 44100
> Block Align : 6
> Bit Width : 24
> Bytes/sec : 264600
>data : 35744256
>End
>
>----------------------------------------
>Sample Rate : 44100
>Frames : 5957376
>Channels : 2
>Format : 0x00010003
>Sections : 1
>Seekable : TRUE
>Duration : 00:02:15.087
>Signal Max : 7.50863e+06 (-0.96 dB)
>
>mark@email-addr-hidden ~ $
>
>I cannot help with the rest. Sorry.
>
>
Thanks mark. I was hoping that there was a utility that I could use in
a script as I have to do this many many times. I guess I could grep for
"Duration<tab>: " and grab the numbers.

brad

>- Mark
>
>
>>>>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,
>>
>>
>>
Received on Tue Dec 20 00:15:11 2005