How to add empty audio track to video stream

Autonomous Machines Jetson & Embedded Systems Jetson Nano
1

Hi all,
I’m developing my application and I would like to add an empty audio track to my stream.

I use python to push frames, encoded with gstreamer, to my rtmp server using this code:

send_gst = "appsrc ! videoconvert ! omxh264enc bitrate=2000000 preset-level=0 ! video/x-h264 ! h264parse ! queue ! flvmux streamable=true ! rtmpsink location="+rtmpUrl
out_send = cv2.VideoWriter(send_gst, 0, int(stream_fps), (opt.width, opt.height))

any suggestion about how to create an empty audio track encoded with video track in h264?

Thanks

2

Hi,
Not sure how to do it in OpenCV code. In gstreamer pipeline, you can utilize audiotestsrc to generate silent sound track:

$ gst-launch-1.0 videotestsrc num-buffers=300 ! omxh264enc ! queue ! mux. <b>audiotestsrc wave=4</b> num-buffers=1000 ! voaacenc ! queue ! qtmux name=mux ! filesink location=a.mp4
3

Your code works but I need to add audio to frames read from a RTSP source.

So for anyone interested, this is the code:

send_gst = "appsrc ! videoconvert ! omxh264enc bitrate=2000000 preset-level=0 ! video/x-h264 ! h264parse ! mux. audiotestsrc wave=silence freq=200 ! voaacenc ! aacparse ! queue ! mux. flvmux streamable=true name=mux ! rtmpsink location="+rtmpUrl
4

Thanks for the sharing.

5

hello,my problem is similiar with u. i use ffmpeg push a rtsp streaming from a pipe.
command = [‘ffmpeg’,
‘-y’,
‘-f’, ‘rawvideo’,
‘-vcodec’, ‘rawvideo’,
‘-pix_fmt’, ‘bgr24’,
‘-s’, sizeStr,
‘-r’, ‘25’,
‘-i’, ‘-’,
‘-c:v’, ‘libx264’,
‘-pix_fmt’, ‘yuv420p’,
‘-preset’, ‘ultrafast’,
‘-tune:v’, ‘zerolatency’,
‘-f’, ‘flv’,
server_rtsp]
i don’t know how to receive this rtsp streaming and republish it by gst rtsp server. can u give me some suggestion? i try your commond by changing rtmpsink to rtspclientsink.But it don’t work.
“appsrc ! videoconvert ! omxh264enc bitrate=2000000 preset-level=0 ! video/x-h264 ! h264parse ! mux. audiotestsrc wave=silence freq=200 ! voaacenc ! aacparse ! queue ! mux. flvmux streamable=true name=mux ! rtspclientsink location=”+rtspUrl

6

Not sure about that, cause I haven’t tried, but have you altro tries these parameters?

rtspclientsink location=server_url user=user user-pw=password protocols=tcp async-handling=false
7

thank u, but it don’t work too