<br>HI all, <br><br>when I try to capture audio and video from USB web cam and usb sound card. the command :<br>ffmpeg -loglevel debug -f video4linux2 -r 30 -s 640x480 -input_format h264 -i /dev/video1 -f alsa -ar 48000 -ac 2 -i hw:0 -vcodec copy -acodec copy <a href="http://localhost:8090/feed1.ffm">http://localhost:8090/feed1.ffm</a> <br>
<br>I got the warning message from ffmpeg:<br><br>Non-monotonous DTS in output stream 0:0; previous: 254883622, current: 254883581; changing to 254883623. This may result in incorrect timestamps in the output file<br><br>
<br>and <br>the VLC player can not play audio data , but video data can be displayed.<br><br>Does anyone have idea and the timestamp ?<br><br>