Combining three commands

Combining three commands

[Santosh Puranshettiwar]

$ /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.
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Re: Combining three commands

[Conway S. Smith]

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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Re: Combining three commands

[Santosh Puranshettiwar]

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
> -
> To unsubscribe from this list: send the line "unsubscribe linux-newbie" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.linux-learn.org/faqs
>
>   

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