After buying 6 new IP cameras recently, I have suddenly discovered that none of them has a microphone :facepalm:
I can’t return them because I’ve done some surgery on them to bypass their 12 V power input diodes, but now I want to stream video from them with audio. I do have a crummy older IP camera laying around that does have audio, but the video quality and features are not what I want. What’s the correct syntax to mux the video from new Cam1 with the audio from older Cam2, while completely discarding the unwanted video from Cam2? Preferably without transcoding anything, since I want to minimize CPU usage. I ran the following command, but it just stalls at time=00:00:09.58 and never returns, and the resulting out.mp4 is an invalid movie with a size of 44 bytes. How do apply “-vn” to Input #1 only? Thanks! ffmpeg -re -thread_queue_size 1024 -rtsp_transport tcp -i "rtsp://anonymous:password1@192.168.1.13:554/cam/realmonitor?channel=1&subtype=0" -i "rtsp://anonymous:password@192.168.1.39:554" -vn -acodec copy -t 00:00:10 out.mp4 ffmpeg version N-100466-g29cef1bcd6-tessus https://evermeet.cx/ffmpeg/ Copyright (c) 2000-2020 the FFmpeg developers built with Apple clang version 11.0.0 (clang-1100.0.33.17) configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay libavutil 56. 62.100 / 56. 62.100 libavcodec 58.115.102 / 58.115.102 libavformat 58. 65.100 / 58. 65.100 libavdevice 58. 11.103 / 58. 11.103 libavfilter 7. 94.100 / 7. 94.100 libswscale 5. 8.100 / 5. 8.100 libswresample 3. 8.100 / 3. 8.100 libpostproc 55. 8.100 / 55. 8.100 Input #0, rtsp, from 'rtsp://anonymous:password1@192.168.1.13:554/cam/realmonitor?channel=1&subtype=0': Metadata: title : Media Server Duration: N/A, start: 0.100000, bitrate: N/A Stream #0:0: Video: h264 (Main), yuv420p(progressive), 1920x1080, 100 tbr, 90k tbn, 180k tbc Input #1, rtsp, from 'rtsp://anonymous:password@192.168.1.39:554': Metadata: title : Session streamed by "preview" comment : Duration: N/A, start: 0.000000, bitrate: N/A Stream #1:0: Video: h264 (High), yuv420p(progressive), 2560x1440, 29.97 tbr, 90k tbn, 180k tbc Stream #1:1: Audio: aac (LC), 16000 Hz, mono, fltp Output #0, mp4, to 'out.mp4': Metadata: title : Media Server encoder : Lavf58.65.100 Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 16000 Hz, mono, fltp Stream mapping: Stream #1:1 -> #0:0 (copy) Press [q] to stop, [?] for help [rtsp @ 0x7fa887008000] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8) [rtsp @ 0x7fa887008000] max delay reached. need to consume packetx [rtsp @ 0x7fa887008000] RTP: missed 1 packets size= 0kB time=00:00:09.58 bitrate= 0.0kbits/s speed=1.11x _______________________________________________ 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".
