I don't know if I am doing something wrong but If I try to record audio with this gstreamer pipeline the recorded file is broken. $ gst-launch pulsesrc device=alsa_output.pci_8086_284b_sound_card_0_alsa_playback_0.monitor ! queue ! audio/x-raw-int,rate=44100,channels=2 ! audioconvert ! faac ! ffmux_mp4 ! filesink location=output.m4a It would be nice if someone could enlighten me. Regards Achim