This works for sure but: mplayer -quiet -rawaudio samplesize=1:channels=1:rate=8000 -demuxer rawaudio \ /tmp/rawaudio.tmp I did discover an interesting little bug that is either a misunderstanding on my part or an off-by-one situation. If you listen to the dump with headphones or a good pair of speakers, you can hear a rhythmic throbbing effect with a rate of about 1 throb per second. It reminds me of the effect you get when the tape guides on a tape machine are allowing the tape to skew a little so the movement over the head is not perfectly horizontal. You almost don't notice it but it is there at times and somewhat annoying. It made me wonder if the codec was feeding audio that was being sampled a little faster than it should be. I changed the sample rate to 8001 and the throb effect doubled in speed, telling me that this was the problem but I had gone in the wrong direction. At 7999, the throb is totally gone and the effect is the same as what you get if you cat a raw audio file directly to /dev/dsp. For all I know, it might not even show up on another computer with a different sound card and possibly a different time base. I tried it on a computer I use at work that has a SBLive sound card and I think I did still hear the slight throb effect. When running with the 7999 rate, the throb returns when one alters the speed with the [] keys and returns to the base rate so it must be picking up a hard-coded value rather than the parameter that was originally fed to mplayer. Seeking with the arrows, however, does not disturb the sampling at all. The only thing one has to watch for is to not try to seek backward or forward past the ends of the file or mplayer exits. I use that 8-bit stream to record voice-grade audio from some VHF scanners and short wave radios. The 4-KHZ upper limit is not suitable for music, but it is just fine for communications audio. You can barely tell the difference between the recording and the live audio. Martin McCormick WB5AGZ Stillwater, OK Systems Engineer OSU Information Technology Department Telecommunications Services Group _______________________________________________ MPlayer-users mailing list MPlayer-users@xxxxxxxxxxxx https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
