Re: Combining three commands

[Santosh Puranshettiwar <santosh@wirkle.com>]

Yes Conway, you got me right.

I tried that. Seems like *decoder* does not work as expected with a "-". 
It rather creates a file with name "-" (which doesn't contain any valid 
content either). I do have its source. Is there anyway we can tweak it 
to make it work our way? 
http://www.3gpp.org/ftp/Specs/2003-09/Rel-5/26_series/26104-520.zip - 
this is where I downloaded the source from. 
<http://www.3gpp.org/ftp/Specs/2003-09/Rel-5/26_series/>

Thanks alot.
Santosh.
Conway S. Smith wrote:
> Santosh Puranshettiwar wrote:
>   
>> $ /home/foouser/decoder input-file.amr temp.raw
>> $ sox –r 8000 –w –c 1 –s temp.raw –r *8000* –w –c 1 temp.wav
>> $ lame –h temp.wav file.mp3 --tt song-title --ta artist --tl album
>>
>> Here are three commands that I wish to combine in one line so as to 
>> avoid any temporary files?
>> Could anyone suggest me a solution.
>>
>> Santosh.
>>     
>
> I'm not entirely sure that I understand what you're asking, but if
> you're asking how to create the end "file.mp3" without creating the
> "temp.raw" and "temp.wav" files, then you can do that if all of your
> /home/foousr/decoder can write its output to standard output instead of
> a file.  Most decoder apps (including sox & lame) are able to do that,
> by specifying a single dash, "-", for the filename.  Assuming
> /home/foouser/decoder works in the standard way, you then connect its
> standard output to the standard input of the next command like this:
>
> $ /home/foouser/decoder input-file.amr "-" | sox –r 8000 –w –c 1 –s -t
> raw "-" –r *8000* –w –c 1 -t wav "-" | lame –h "-" file.mp3 --tt
> song-title --ta artist --tl album
>
> That should tell /home/foouser/decoder to read a datastream from
> input-file.amr, and write the decoded datastream to stdout; that stdout
> is then connected by a pipe to the stdin of the sox command, which will
> read its input from the stdin, with the assumption that the input is in
> raw format, and write its output to stdout in wav format (I added the
> "-t raw" & "-t wav" options), and then the stdout of the sox command is
> connected to the stdin of the lame command, and the lame command reads
> its input from stdin, and writes to file.mp3.
>
> Hope this helps,
> Conway S. Smith
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