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• How can i list all the audio devices on my pc using ffmpeg ? [closed]

  12 octobre 2024, par Daniel Lip

  I'm using ffmpeg version : 2024-07-10

  


  I tried this cmd command after running the cmd as admin.

  


  ffmpeg -list_devices true -f dshow -i dummy


  


  but the result is :

  


  D:\>ffmpeg -list_devices true -f dshow -i dummy
ffmpeg version 2024-07-10-git-1a86a7a48d-essentials_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 13.2.0 (Rev5, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      59. 28.100 / 59. 28.100
  libavcodec     61. 10.100 / 61. 10.100
  libavformat    61.  5.101 / 61.  5.101
  libavdevice    61.  2.100 / 61.  2.100
  libavfilter    10.  2.102 / 10.  2.102
  libswscale      8.  2.100 /  8.  2.100
  libswresample   5.  2.100 /  5.  2.100
  libpostproc    58.  2.100 / 58.  2.100
[dshow @ 000001c1e700f200] Could not enumerate video devices (or none found).
[dshow @ 000001c1e700f200] Could not enumerate audio only devices (or none found).
[in#0 @ 000001c1e700ee00] Error opening input: Immediate exit requested
Error opening input file dummy.


  


• using mediamtx to stream video to browser [closed]

  18 octobre 2024, par Maximilian

  I am using rtsp to feed a video stream to mediamtx.

  


  I want to display the feed in a browser but always get some errors.

  


  I use the following to start mediamtx

  


  podman run --rm -it -e MTX_PROTOCOLS=tcp -e MTX_WEBRTCADDITIONALHOSTS=192.168.x.x -p 8554:8554 -p 1935:1935 -p 8888:8888 -p 8889:8889 -p 8890:8890/udp -p 8189:8189/udp docker.io/bluenviron/mediamtx


  


  I use this ffmpeg line to feed mediamtx :

  


  ffmpeg -i "rtsp://127.0.0.1:10000/test" -f rtsp rtsp://127.0.0.1:8554/feed


  


  I can view the feed with

  


  ffplay  rtsp://localhost:8554/feed


  


  ffplay says some things about my stream

  


  the mediamtx stream

  


  Input #0, rtsp, from 'rtsp://localhost:8554/feed':
  Metadata:
    title           : Session streamed with GStreamer
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: mpeg4 (Simple Profile), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 30 tbr, 90k tbn, 30 tbc


  


  the source stream

  


  Input #0, rtsp, from 'rtsp://localhost:10000/test':
  Metadata:
    title           : Session streamed with GStreamer
    comment         : rtsp-server
  Duration: N/A, start: 0.199989, bitrate: N/A
  Stream #0:0: Video: h264 (Constrained Baseline), yuv420p(tv, smpte170m, progressive), 320x240 [SAR 1:1 DAR 4:3], 30 fps, 30 tbr, 90k tbn, 60 tbc


  


  I use this html code try to display the video :

  


  
    



  


  mediamtx gives the following output when the browser tries to connect :

  


  2024/10/18 07:52:51 INF [RTSP] [session 7fe6a91a] created by 10.0.2.100:57542
2024/10/18 07:52:51 INF [RTSP] [session 7fe6a91a] is publishing to path 'feed', 1 track (MPEG-4 Video)
2024/10/18 07:52:52 INF [WebRTC] [session 9d4fb884] created by 10.0.2.100:55070
2024/10/18 07:52:52 INF [WebRTC] [session 9d4fb884] closed: the stream doesn't contain any supported codec, which are currently AV1, VP9, VP8, H264, Opus, G722, G711, LPCM


  


  The stream is clearly h264... why is it complaining ?

  


• ffmpeg use on iOS

  2 juillet 2015, par Chuck Mc Duran

  I understand that to use FFmpeg in an iOS app, you use the ./configure and make to generate the .a files, that you will add to the project.

  My question is, once the .a files show up in the project navigator and in the Link Binary With Libraries section, how do you actually use them in your classes ?, I see there is no "framework" to use in an #import statement, so I don’t know how to access the classes methods and properties.