Recherche avancée

Sur d’autres sites (9064)

• DirectShow Capture Source and FFMPEG

  27 janvier 2015, par Juan Ayala

  I have an AJA Capture card. The drivers installed with the card include some DirectShow filter. If I pop the filter into GraphEdit I see this :

  

  and if I run the ffmpeg command

  ffmpeg -f dshow -list_options true -i video="AJA Capture Source"

  I see

  [dshow @ 0034eec0] DirectShow video device options
  
  [dshow @ 0034eec0]  Pin "Video"
  
  [dshow @ 0034eec0]   pixel_format=yuyv422  min s=720x486 fps=27.2604 max s=1024x
  
  486 fps=29.985
  
  ...
  
  [dshow @ 0034eec0]  Pin "Audio 1-2"
  
  [dshow @ 0034eec0]  Pin "Line21"
  
  video=AJA Capture Source: Immediate exit requested

  So I see the Video and Audio pins I need. But when I try to run an ffmpeg command to capture both, I can only figure out how to do the video part. How do I hook in to that audio pin ? It seems all the examples and documentation point to using a separate audio device, and nothing about hooking into the pins. I’m running it out of a batch file for now like this and I use the ^ to break the line

  ffmpeg.exe ^
  
  -y ^
  
  -rtbufsize 100M ^
  
  -f dshow ^
  
  -i video="AJA Capture Source" ^
  
  -t 00:00:10 ^
  
  -aspect 16:9 ^
  
  -c:v libx264 ^
  
  "C:\VCS_AUD_SAMPLE.mp4"

  Again, the command above will get me some beautiful video, but I can’t figure out the audio part. Is this even supported in ffmpeg or am I going to have to modify the ffmpeg dshow code ?

• Problems using Intel Quick Sync H.264 Encoder with FFMPEG (shared) [closed]

  28 mai 2024, par Michael Werner
  

  • OS : Windows 11 Pro

  


  • IDE : Visual Studio 2022

  


  • PL : C++

  


  • Libraries : FFMPEG shared (own x64 Windows build with libmfx)

  


  


  I am trying to encode frames from a framegrabber card with Intel Quick Sync Encoder using libmfx in FFMPEG shared / libav but I am getting an error always. The "same" procedure using ffmpeg.exe of same build works fine.

  


  I increased the FFMPEG logging level to the maximum level. The avcodec_send_frame function always returns -22 (which means "Invalid argument"). And I do not get more information from the log output /console. The only thing the encoder is reporting is :

  


  [h264_mp4toannexb @ 0000028e41f42e00] The input looks like it is Annex B already

[h264_qsv @ 0000028e41f46980] Invalid pkt_timebase, passing timestamps as-is.


  


  The frames from the grabber card are 1920x1080 pixel YUV420P. I send them as they are to the encoder setting following FFMPEG video codec context options :

  


  

  • bit_rate : 5000000

  


  • width : 1920

  


  • height : 1080

  


  • framerate : 50, 1

  


  • max_b_frames : 3

  


  • pix_fmt : AV_PIX_FMT_YUV420P

  


  


  Actually I do not set any private encoder options.

  


  Does anyone have an idea what I am doing wrong or what is missing ? Is there a way to increase the debug output of libmfx ? I do not find anything related in the encoders private options.

  


• Video capture by FFMPEG with closed captions data

  9 septembre 2019, par MaximVolobuev

  I’m trying to capture TV broadcasting from Avermedia C027 card using FFMPEG :

  ffmpeg -y -re -rtbufsize 500M -video_size 1920x1080 -framerate 29.97 -f dshow -i video="@device_pnp_\\?\pci#ven_1a0a&dev_6202&subsys_620f1461&rev_01#4&3227f04d&0&00d8#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\{ede957b0-eaa5-4bf4-acf3-6e10cb4836c3}":audio="@device_pnp_\\?\pci#ven_1a0a&dev_6202&subsys_620f1461&rev_01#4&3227f04d&0&00d8#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\{ca465100-deb0-4d59-818f-8c477184adf6}" -c:v h264 -c:a aac -f mpegts test.ts

  Video and audio is OK, but captured video does not contain EIA-608 closed captions data. I tried to add [out0+subcc] flag after video device name, but FFMPEG says that device name is incorrect in this case.

  Video data of Avermedia card undoubtly contain closed captions, because another software installed to the computer can capture video with closed captions.

  Is there any flags to tell to FFMPEG that closed captions should be captured with video ?