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• Saving highest quality video from video-capture card

  23 décembre 2013, par DusteD

  I have a machine with 2x3 3ghz dual-core xeon and 4x10krpm scsi 320 disks in raid0.
  The capture card is an osprey 560 64 bit pci card.
  Operating system is currently Windows Server 2003.

  The video-stream that I can open with VLC using direct show is rather nice quality.
  However, trying to save this video-stream without loss of quality has proven quite difficult,
  using the h264 codec I am able to achieve a satisfying quality, however, all 4 cores jump to 100% load after a few second and then it start dropping frames, the machine is not powerful enough for realtime encoding. I've not been able to achieve satisfying mpeg1 or 4 quality, no matter which bitrate I set..

  Thing is, the disks in this machine are pretty fast even by todays standard, and they are bored.. I don't care about disk-usage, I want quality.
  I have searched in vain for a way to pump that beautiful videostream that I see in VLC onto the disk for later encoding, I reckon the disks would be fast enough, or maybe something which would apply a light compression, enough that the disks can keep up, but not so much as to loose visible quality.

  I have tried FFMPEG as it seems capable of streaming a yuv4 stream down to the disk, but ofcause FFMPEG is unable to open the dshow device ( same error as this guy Ffmpeg streaming from capturing device Osprey 450e fails )

  Please recommend a capable and (preferably) software which can do this.

• Using ffmpeg for recording multi audio track and video from decklink card ?

  24 février 2020, par Tuanxter

  I want to use ffmmpeg to record video and audio with multiple audio tracks, I used this command and tried many other ways but the video file has only 1 audio track ? Can someone help me ? Thank very much !
  My command :
  ffmpeg -y -f dshow -video_size 1920x1080 -pixel_format uyvy422 -rtbufsize 152000 -framerate 25 -i video="Decklink Video Capture":audio="Decklink Audio Capture" -codec:v libx264 -pix_fmt yuv420p -preset ultrafast output.mp4 ?

• Image mask blur processing problem using ffmpeg

  16 avril 2024, par andrew kim

  I want to apply blur using masking to two or more points in the image. I want to use a circular or other type of blur in ffmpeg rather than a box blur. I wrote the ffmpeg code, but an error continued. When there is only one blur, it works correctly, but when there are two or more blurs, an error occurs. No matter how much I search, I can't figure it out, so I'd like to ask for help.

  


  The ffmpeg code I wrote is as follows.

  


  ffmpeg -i input.mp4 -i mask.png -filter_complex "`
[1:v]scale=200:200,pad=1920:1080:(ow-iw)/1:(oh-ih)/1[pmask1]; `
[1:v]scale=200:200,pad=1920:1080:(ow-iw)/3:(oh-ih)/3[pmask2]; `
[0:v][pmask1]alphamerge,avgblur=10[alf];[0:v][alf]overlay[temp1]; `
[temp1][pmask2]alphamerge,avgblur=10[alf2];[temp1][alf2]overlay[v] `
"-map "[v]" -map 0:a -c:v libx264 -c:a copy -movflags +faststart maskedblur.mp4


  


  The error is as follows.

  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 0000026ed1d4a500] Invalid stream specifier: temp1.
    Last message repeated 1 times
[fc#0 @ 0000026ed1cdc280] Stream specifier 'temp1' in filtergraph description
[1:v]scale=200:200,pad=1920:1080:(ow-iw)/1:(oh-ih)/1[pmask1];
[1:v]scale=200:200,pad=1920:1080:(ow-iw)/3:(oh-ih)/3[pmask2];
[0:v][pmask1]alphamerge,avgblur=10[alf];[0:v][alf]overlay[temp1];
[temp1][pmask2]alphamerge,avgblur=10[alf2];[temp1][alf2]overlay[v]
 matches no streams.
Error initializing complex filters: Invalid argument