Hi,
Hart mentioned my program called dae (short for digital audio editor), so
I will try and explain to what extent it might do Martin's job.
If you convert your 8-bit raw audio into a wav file using sox or
similar, you can use dae on it.
Dae will start playing the file when it is loaded and, while playing, one
can press a button, f5, to mark the start of a block. This will be when
you reach the audio that is interesting.
One can then press f6 when the interesting part is passed. That block can
then be written out to a separate file using f8, which allow you to
specify a file name for the block.
Alternatively, while the file is playing, one can press p which marks a
position in the file. Each time you want to have a track boundary, you
press p. once you are done, you can press S to split up the file into the
tracks defined by the marked positions.
This might almost do what you want, but maybe not quite.
Dae uses ecasound for the heavy lifting and is written in python.
HTH, Willem
On Mon, 11 Jul 2016, Joel Roth wrote:
Hi Martin,
From what you write, I think you want to extract interesting
parts of an audio file to another audio file, although you
could mean extracting parts of an audio *stream* to a file.
I looked at ecasound. I came up with a plan, but I think it
won't work because I don't see an easy way to append output to an
existing file.
Nama (which uses ecasound) is another possibility. Nama can
extract parts of an audio file, and has some special
features for that purpose. Basically, you drop marks in
pairs, create a sequence using the content between the
marks, and then export the desired audio via mixdown. Right
now you have to specify the list of marks to use, but we
might find ways to simplify that when dealing with large
numbers of marks.
regards,
Joel
Martin McCormick wrote:
I am always looking for the easiest way to do things but
am also aware of that quotation which goes "The lazy man works
the hardest."
I want to play a file which is usually 8-bit audio at
a sampling rate of 8000 samples per second, sometimes called raw
8-bit audio. If I hear something worth saving, I would like to
copy that part of the stream to a new file and then stop the copy
when the good stuff has passed, just like dubbing from one tape
recorder to another.
I just installed ecasound as it should be able to
accomplish this task but the question is will mplayer also do this?
The idea is one listens, hears something interesting to
save, starts the recording at the right time and then stops it
after the gem has been saved while the master continues to play.
If a new treasure comes by, start recording again and save that
in the same new file or maybe a series of files depending upon
what one wants.
Thanks for any suggestions. This audio is radio traffic
so it doesn't need to be high fidelity. One usually wants the
most audio crammed in to the least space.
Thanks for all good ideas.
Martin WB5AGZ
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