30 May
2010
30 May
'10
3:32 p.m.
Nigel Henry:
Big problem for dialup users since BBC stopped realmedia streams.
Listening to BBC radio on dialup is now hopeless as both the BBC's iplayer
(flash), and wm streams need all the dialup bandwidth plus more (48kbps), so
what I'm doing is recording the programmes, and hope to remove the silent
buffering sections after which I can listen to them in the normal manner.
Removing the silent bits manually, in mhwaveedit for example is going to take
forever, so the question is, does anyone know of anything that would
accomplish this automatically? I can think of 2 options as below, but how to
accomplish them.
1: Some way of doing these recordings where the recording device will pause
for the buffering silences, then continue when the speech starts again.
Obviously it wouldn't want to stop for speech pauses, but these are not
completely silent as are the buffering silences. I'm using qarecord at the
moment for the recordings.
2: Some program to run the recorded wav files through, which would remove the
buffering silence sections.
If you load your file into Snd, it should work to paste the following
lines into the terminal Snd was started from:
(let loop ((x 0)
(x0 -1))
(let ((y (sample x)))
(cond ((and (= x0 -1)
(= y 0))
(loop (1+ x)
x))
((and (not (= x0 -1))
(not (= y 0))
(> (- x x0) 32))
(display "deleting")(display x0)(display " ->
")(display x)(newline)
(let loop ((ch 0))
(cond ((< ch (channels))
(delete-samples x0 (- x x0) (selected-sound) ch)
(loop (1+ ch)))))
(loop x0 -1))
((and (not (= x0 -1))
(not (= y 0)))
(loop (1+ x) -1))
((< x (frames))
(loop (1+ x) x0)))))
You might want to adjust the number 32 (minimum number of zero-frames to
yield a deletion), but I think 32 should work fine.
30 May
30 May
9:19 p.m.
New subject: How to remove buffering silence from wav files
On Sunday 30 May 2010 15:32, Kjetil S. Matheussen wrote:
Nigel Henry:
Hi Kjetil.
Thanks for the suggestion. I'll give that a go. Never used Snd before, but
always ready to try a new program.
Manually editing in mhwaveedit is a real pain, even zoomed in a lot, but I've
managed to remove virtually all the silent bits that way, so that the
recordings play quite well now.
For future recordings "silence free" I found Doh!, a button in Kaffeine to
save stream. It means I have to initially play the program through to the
end, but can always do something else with the sound turned down, and play
the saved stream later.
Many thanks for your reply.
Nigel.
Big problem for dialup users since BBC stopped
realmedia streams.
Listening to BBC radio on dialup is now hopeless as both the BBC's
iplayer (flash), and wm streams need all the dialup bandwidth plus more
(48kbps), so what I'm doing is recording the programmes, and hope to
remove the silent buffering sections after which I can listen to them in
the normal manner.
Removing the silent bits manually, in mhwaveedit for example is going to
take forever, so the question is, does anyone know of anything that would
accomplish this automatically? I can think of 2 options as below, but
how to accomplish them.
1: Some way of doing these recordings where the recording device will
pause for the buffering silences, then continue when the speech starts
again. Obviously it wouldn't want to stop for speech pauses, but these
are not completely silent as are the buffering silences. I'm using
qarecord at the moment for the recordings.
2: Some program to run the recorded wav files through, which would remove
the buffering silence sections.
If you load your file into Snd, it should work to paste the following
lines into the terminal Snd was started from:
(let loop ((x 0)
(x0 -1))
(let ((y (sample x)))
(cond ((and (= x0 -1)
(= y 0))
(loop (1+ x)
x))
((and (not (= x0 -1))
(not (= y 0))
(> (- x x0) 32))
(display "deleting")(display x0)(display " ->
")(display
x)(newline) (let loop ((ch 0))
(cond ((< ch (channels))
(delete-samples x0 (- x x0) (selected-sound) ch)
(loop (1+ ch)))))
(loop x0 -1))
((and (not (= x0 -1))
(not (= y 0)))
(loop (1+ x) -1))
((< x (frames))
(loop (1+ x) x0)))))
You might want to adjust the number 32 (minimum number of zero-frames to
yield a deletion), but I think 32 should work fine.
9:39 p.m.
New subject: How to remove buffering silence from wav files
On Sun, May 30, 2010 at 9:19 PM, Nigel Henry wrote:
...
For future recordings "silence free" I found
Doh!, a button in Kaffeine to
save stream. It means I have to initially play the program through to the
end, but can always do something else with the sound turned down, and play
the saved stream later.
probably the same result as the 'save stream'
button in kaffeine, it's just another option using
the command line and mplayer:
$ mplayer -noframedrop -dumpfile <filename> -dumpstream <url>
this did it for me in cases where gap free realtime
streaming was impossible, I never tried it on dialup
though.
best,
d
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linux-audio-user@lists.linuxaudio.org
2 comments
3 participants
participants (3)
-
David Adler -
Kjetil S. Matheussen -
Nigel Henry