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• FFMPEG DirectShow AJAX Audio capture

  1er septembre 2019, par NiCO

  I have an AJA board with an SDI input cable connected to it.
  The input signal has video and audio embeded.

  The video is accesible through the "Vid" Pin and the audio is accesible through the "Aud 1-2" pin.

  Well running DirectShow filter graphs :

  

  

  "No Direct Show Audio Devices" :

  

  I cannot get FFMPEG to correctly map the audio part.

  This is what I tried without success to record the audio :

  ffmpeg -y -rtbufsize 2048M -f dshow -i audio="AJA S-Capture KonaLHi- 0"  -acodec pcm_s24le -ar 48000 output.wav
  
  
  
  ffmpeg -y -rtbufsize 2048M -f dshow -audio_pin_name "Aud 1-2" -i audio="AJA S-Capture KonaLHi- 0"  -acodec pcm_s24le -ar 48000 output.wav

  this is the return error I get
  return error :

  

  The filter is NOT being used by any other software.
  I have no problems recording the video.

• How to Play Smooth 4K Video with FFplay ? [closed]

  14 mai 2020, par Matan Marciano

  Im trying to play 4K video with ffplay and the video is not smooth.

  



  Video File :

  



  

  • Big Buck Bunny, 4K, 60fps, 30Mbps

  


  • http://distribution.bbb3d.renderfarming.net/video/mp4/bbb_sunflower_2160p_60fps_stereo_abl.mp4

  


  



  Hardware :

  



  

  • Dell OptiPlex 7070 Micro (8 Cores, 8GB RAM, GPU : Intel Corporation UHD Graphics 630)

  


  • Samsung U28E590D, 4K Screen

  


  • DisplayPort to HDMI Cable

  


  



  Software :

  



  

  • Ubuntu 19.04

  


  • ffplay with libmvx (according this guide : https://github.com/Intel-Media-SDK/MediaSDK/wiki/Build-and-use-ffmpeg-with-MediaSDK)

  


  



  The FFplay command I used is : ffplay -vcodec h264_qsv -i input.ts

  



  

  • Notes :

  


  • During the playing, my CPU usage is around 25% (according to 'top' command)

  


  • FFplay logs indicate on many frame drops

  


  • I also tried VLC and MPV player's- VLC looks bad also. MPV player looks better but still not smooth.

  


  



  So, its looks like my hardware is good enough for 4K playing. What am I missing ?
How can I play smooth 4K video via FFplay ?

  


• Getting error while streaming with ffmpeg

  30 novembre 2019, par Tirtha

  I am trying to stream with ffmpeg. Video source is vmix. While streaming ffmpeg throws i/o error and stops.
  Available Devices :

  [dshow @ 0000028c44498ec0] DirectShow video devices (some may be both video and audio devices)
  
  [dshow @ 0000028c44498ec0]  "e2eSoft VCam"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_pnp_\\?\root#image#0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
  
  [dshow @ 0000028c44498ec0]  "HP Truevision HD"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_pnp_\\?\usb#vid_04f2&pid_b50d&mi_00#6&2557162&1&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
  
  [dshow @ 0000028c44498ec0]  "vMix Video"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_sw_{860BB310-5D01-11D0-BD3B-00A0C911CE86}\{8E14549A-DB61-4309-AFA1-3578E927E938}"
  
  [dshow @ 0000028c44498ec0]  "vMix Video External 2"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_sw_{860BB310-5D01-11D0-BD3B-00A0C911CE86}\{8E14549A-DB61-4309-AFA1-3578E927F974}"
  
  [dshow @ 0000028c44498ec0]  "vMix Video YV12"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_sw_{860BB310-5D01-11D0-BD3B-00A0C911CE86}\{8E14549A-DB61-4309-AFA1-3578E927FF92}"
  
  [dshow @ 0000028c44498ec0] DirectShow audio devices
  
  [dshow @ 0000028c44498ec0]  "Microphone (Realtek High Definition Audio)"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{3522D665-FB21-41E0-AF83-CC3432431D30}"
  
  [dshow @ 0000028c44498ec0]  "vMix Audio"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{008E145B-DB61-4309-AEA1-3578E927E940}"
  
  [dshow @ 0000028c44498ec0]  "vMix Audio - Bus A"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{008E145B-DB61-4309-AEA1-3578E927E944}"
  
  [dshow @ 0000028c44498ec0]  "vMix Audio - Bus B"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{008E145B-DB61-4309-AEA1-3578E927E948}"
  
  [dshow @ 0000028c44498ec0]  "vMix Audio - M A B"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{008E145B-DB61-4309-AEA1-3578E927E952}"
  
  [dshow @ 0000028c44498ec0]  "vMix Audio - M A"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{008E145B-DB61-4309-AEA1-3578E927E956}"
  
  [dshow @ 0000028c44498ec0]  "CABLE Output (VB-Audio Virtual Cable)"
  
  [dshow @ 0000028c44498ec0]     Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{D27F382E-4EA5-49D0-8F87-2B5F144BC155}"

  I tried to stream using the command as :

  ffmpeg -re -rtbufsize 1024M -framerate 25 -f dshow -video_size 1280x720 -channels 2 -i video="vMix Video":audio="vMix Audio" -c:v libx264 -pix_fmt yuv420p -g 50 -crf 20 -profile:v high -preset:v veryfast -tune film -c:a libfaac -b:a 256k -f mp4 "D:\recordedfile.mp4"

  Getting error as :

  [dshow @ 0000028144d4c7c0] Could not set video options
  
  video=vMix Video:audio=vMix Audio: I/O error

  Video interface works fine if i use other tools like gstreamer but its not working with ffmpeg. Please suggest where I am wrong or what I am missing ? I am using windows OS. Thank you for reading.