29 Jan
2012
29 Jan
'12
1:37 a.m.
On 01/28/2012 11:35 PM, Alfs Kurmis wrote:
Hi Experts.
For my small multimedia audio project i wanna use mplayer as external decoder.
As usually via pipe , for example so
mplayer -af resample=44100:0:1,channels=2,format=s16le -ao
pcm:nowaveheader:file=/dev/stdout -quiet -really-quiet 'saund_file.ext' |
nextprog -options ...
or so
http://martini.pudele.com/radio/programming/audio/mplayerdecso01.c
I prefer output to pipe, not FIFO.
It seems that mplayer also all messages put to stdout :(
That's probably why mplayer devs recommend using mkfifo (named pipe)
instead of stdout.. 'mencoder' can do it.
If you need to support a variety of unknown formats and codecs: ffmpeg
is an alternative and gstreamer might be one.
ffmpeg -i /some/file -f u16le -acodec pcm_s16le -ar 44100 - \
| jack-stdin system:playback_1 system:playback_2
on that note, `jack-stdout` can capture and pipe raw PCM data from any
JACK-application including `mplayer -ao jack /some/file`. YMMV.
HTH,
robin