I am on Ubuntu 22.04 and trying to combine 2 cameras into one stream that is being sent to a loopback device. The command appears to work but I can't see the stream in any way. I've tried VLC Cheese ffplay guvcview and none of them work. The command I am using is : *ffmpeg -f v4l2 -vcodec rawvideo -i /dev/video0 -f v4l2 -vcodec rawvideo -i /dev/video2 -filter_complex hstack,"scale=iw*.5:ih*1" -f v4l2 -vcodec mjpeg /dev/video4 *
This should give me a combined output of 1280x720 and the following output of ffmpeg shows that it is. Any idea what I am doing wrong? Ultimately I want to send this combined output to Zoom. Thanks .Relevant output of the ffmpeg command follows: Input #0, video4linux2,v4l2, from '/dev/video0': Duration: N/A, start: 10914.045895, bitrate: 147456 kb/s Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720, 147456 kb/s, 10 fps, 10 tbr, 1000k tbn, 1000k tbc Input #1, video4linux2,v4l2, from '/dev/video2': Duration: N/A, start: 10915.081944, bitrate: 147456 kb/s Stream #1:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720, 147456 kb/s, 10 fps, 10 tbr, 1000k tbn, 1000k tbc Stream mapping: Stream #0:0 (rawvideo) -> hstack:input0 Stream #1:0 (rawvideo) -> hstack:input1 scale -> Stream #0:0 (mjpeg) Press [q] to stop, [?] for help [swscaler @ 0x55a69b913440] deprecated pixel format used, make sure you did set range correctly Output #0, video4linux2,v4l2, to '/dev/video4': Metadata: encoder : Lavf58.76.100 Stream #0:0: Video: mjpeg, yuvj422p(pc, progressive), 1280x720, q=2-31, 200 kb/s, 10 fps, 10 tbn (default) Metadata: encoder : Lavc58.134.100 mjpeg Side data: cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A [video4linux2,v4l2 @ 0x55a69b8fa900] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8) _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".