At Tue, 10 Mar 2020 20:49:55 +0200,
Yorick Hardy wrote:
> ffmpeg4 -f oss -i /dev/audio -channels 1 -sample_rate 48000 /tmp/test.wav
>
> is completely garbled and too short. The file also seems to be 2-channel,
> so I think the recording settings are somehow not applied correctly.
I rarely use ffmpeg4 but according to ffmpeg4 documents,
-channels/-sample_rate are for video and -ac/-ar are for audio?
% /usr/bin/time ffmpeg4 -f oss -t 0:05 -i /dev/audio -channels 1 test1.wav
5.04 real 0.02 user 0.04 sys
% file test1.wav
test1.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit,
stereo 48000 Hz
% /usr/bin/time ffmpeg4 -f oss -t 0:05 -i /dev/audio -ac 1 test2.wav
5.04 real 0.04 user 0.02 sys
% file test2.wav
test2.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono
48000 Hz
% /usr/bin/time audioplay test1.wav
2.54 real 0.00 user 0.00 sys
% /usr/bin/time audioplay test2.wav
2.54 real 0.00 user 0.00 sys
As you said, output file was too short. However ffmpeg4 probably
recorded specified period and created small file so that I think
you need to look ffmpeg4 at first.
Thanks,
---
Tetsuya Isaki <is...@pastel-flower.jp / is...@netbsd.org>
