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MediaSPIP 0.1 Beta version
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ffmpeg stream videos from two cams have a same device name
21 novembre 2020, par junsangThere are two cameras have a same device name Microsoft® LifeCam Studio(TM).

ffmpeg -list_deivces true -f dshow -i dummy
prints the below output.


C:\Users\user>ffmpeg -list_devices true -f dshow -i dummy
ffmpeg version git-2020-02-05-e6891d1 Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 9.2.1 (GCC) 20200122
 configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
 libavutil 56. 39.100 / 56. 39.100
 libavcodec 58. 67.101 / 58. 67.101
 libavformat 58. 37.100 / 58. 37.100
 libavdevice 58. 9.103 / 58. 9.103
 libavfilter 7. 74.100 / 7. 74.100
 libswscale 5. 6.100 / 5. 6.100
 libswresample 3. 6.100 / 3. 6.100
 libpostproc 55. 6.100 / 55. 6.100
[dshow @ 000001d5c5108dc0] DirectShow video devices (some may be both video and audio devices)
[dshow @ 000001d5c5108dc0] "Microsoft® LifeCam Studio(TM)"
[dshow @ 000001d5c5108dc0] Alternative name "@device_pnp_\\?\usb#vid_045e&pid_0811&mi_00#8&6ae46e6&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
[dshow @ 000001d5c5108dc0] "Microsoft® LifeCam Studio(TM)"
[dshow @ 000001d5c5108dc0] Alternative name "@device_pnp_\\?\usb#vid_045e&pid_0811&mi_00#8&e544916&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
[dshow @ 000001d5c5108dc0] DirectShow audio devices
[dshow @ 000001d5c5108dc0] "Desktop Microphone (6- Microsoft® LifeCam Studio(TM))"
[dshow @ 000001d5c5108dc0] Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{D5F4881A-6E88-4563-8BA0-081CFD50E353}"
[dshow @ 000001d5c5108dc0] "Desktop Microphone (5- Microsoft® LifeCam Studio(TM))"
[dshow @ 000001d5c5108dc0] Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{84674B28-DC68-4AC0-8331-D687C7B7D69C}"
[dshow @ 000001d5c5108dc0] "Digital Audio (S/PDIF) (High Definition Audio Device)"
[dshow @ 000001d5c5108dc0] Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{CDD24485-59D2-4BED-B6FC-B7447251C7E2}"




Because the two cameras have a same device name, I couldn't stream two videos using this simple command at a same time :
ffplay -f dshow -i video=Microsoft® LifeCam Studio(TM)
.

So I used pin names following the ffmpeg dshow example.
The only thing I could check wasCould not find video device with name [video=~~pin name~~] among source devices of type video.



What
ffplay
command makes enable to stream both videos ?

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