Hi there, I've just started playing with PulseAudio, so sorry if I'm missing something really obvious here. Here's the scenario - I want to capture the sound of different client applications connected to PulseAudio and encode each sound stream independently using FFMPEG. I'm using Ubuntu, which has version 0.9.10 installed. I've made all configurations to make sure I'm getting everything into PA (ALSA, EDS, etc...). This works fine. I know that FFMPEG has a built-in OSS grabbing feature, so one option would be to configure an OSS sink and route all sound to it. But I don't want to go down that route, since that defeats the "independent stream encoding" goal. So, another idea is using pipe-sinks. In theory, I could set up N different pipe-sinks for N running clients and move each stream to a separate pipe. Then, since FFMPEG can get its input from a pipe, I could have N instances of FFMPEG running and encoding in real-time. But here's my problem - when reading the pipe that PA creates, I get an enormous data rate out of it. I configure it for 22050Hz, s16le and 2 channels, so I expect around 705kb/s.. Even without anything playing, it seems that the output is just flooding with zeros. To do a quick test, if I "cat pipname > grabbed" for a couple of seconds, the file reaches 200, 300 MB easily. So - my guess is that pipe-sink module seems to be outputting data as fast as it can, even if it is just 0s. Is is this case? Is it on purpose? Can someone explain what's going on? (or perhaps have better suggestions on how to achieve the same goal)? I can create and compile my own module, if necessary (I've managed to make a copy of the module-pipe-sink, deploy it and load it up on PA), so I can tweak the code if necessary.... Thanks, Rui -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20080523/172133d4/attachment.htm>
