I just spent two hours unsuccessfully trying to get the given example to work.
zmqsend <<<"lumakey@toggle tolerance 0" never terminates. I guess, nothing is more permanent than a temporary solution ... Cheers, Stephan P.s. The zmq example given in the docs directly segfaults for me with a freshly compiled ffmpeg. Am Mo., 27. Apr. 2020 um 20:50 Uhr schrieb Stephan Monecke <stephanmone...@gmail.com>: > > That looks really interesting! Thanks a lot, I'll have a look at it! > > Besides daily checking, I managed to overlook ALL the replies ... sorry for > my late answer and thanks a lot for yours! > > OBS is not an option since everything is done automatically / from > command-line (and afaik OBS transcodes what would additionally overburden the > small machine). > > It needs to be light and reliable. > > For now, I came up with the nginx rtmp plugin that, used as a local loopback > device, now acts as a multiplexer. > > Two mutually exclusive systemd services forward the respective rtsp stream to > the nginx server and ffmpeg records from it. > > That way, by starting one or the other service, I switch the stream. > > The starting of the two services is bound to the two corresponding arrow keys > of a simple Logitech R400 presenter via xbindkeys (the remaining two keys > toggle a recording and a YouTube live-stream). > They are present in abundance at the institute and the setup is practically > free of cpu usage even on this weak machine. > > That way, the lecturer can switch between blackboards / cameras and fully > control the procedure just via the presenter. > Best regards, > Stephan Monecke > -- > Sent from my mobile device. Please excuse my brevity. > > Am 24. April 2020 21:56:12 MESZ schrieb Edward Park <kumowoon1...@gmail.com>: >> >> Hi, >> >>> How can this be done with FFmpeg? Do you have an example? I know how >>> commands / sendcmd works. The opacity could be toggled, or the streamselect >>> filter could be used. But where does the switching signal come from, while >>> FFmpeg is running? >> >> >> >> The specific messaging protocol/method would depend on a variety of factors >> including personal preference, but to parrot an example given in the manual >> using zmq, >> >> % ffmpeg -i INPUT -filter_complex >> 'null[main];movie=INPUT2,zmq,lumakey@toggle=tolerance=1,[main]overlay,realtime' >> OUTPUT >> >> and sending commands to the named lumakey filter would mimic toggling >> between the two streams if they were the same size and position. >> i.e. using the zmqsend example program, >> >> % zmqsend <<<"lumakey@toggle tolerance 0" >> >> Regards, >> Ted Park >> ________________________________ >> 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". _______________________________________________ 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".
