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• Is there a way to pipe input video into ffmpeg ?

  31 janvier 2019, par Joe Williams

  ffmpeg -f avfoundation -i "1:0" -vf "crop=1920:1080:0:0" -pix_fmt yuv420p -y -r 30 -c:a aac -b:a 128k -f flv rtmp://RTMP_SERVER:RTMP_PORT/STREAM_KEY

  Hello guys, the above command works pretty well. It records the audio/video of the computer. But what I want to do is pipe a repeating video or image(png/jpeg/gif), so that there is no live video feed from the computer, but just the image on the stream with the audio.

  How would you go about doing this ?

  Also, if you know any programming interfaces that can do this same thing, please give suggestions. Because I would rather not use a CLI.

• ffmpeg change video stream resolution

  10 décembre 2014, par skorpionet

  I have an MKV with a video stream with wrong resolution of 1920x800, but the inside film is 1920x1080 so my main video player, an LG Smart TV, shows a flattened image. I can easily change resolution in container metadata but LG TV ignores this data and read only video stream data.

  First question : only way to change video stream resolution data is scale the video ?

  To scale with ffmpeg I used this command :

  ffmpeg -i input.mkv -map 0 -c:a copy -c:s copy -c:v libx264 -preset slow -crf 17 -vf scale=1920:1080,setdar=16/9 output.mkv

  Now the mkv is fine, my LG TV read it, looks awesome but..... size went from 3,3Gb to 12Gb !!
  Overall bit rate of 3,3Gb video is 2.704 Kbps, 12Gb is 9.829 Kbps. I think that 7000Kbps more are useless, in original video there aren’t info to raise quality.

  Second question : Why this huge size change ? What is my mistake ?

  Best Regards

• ffmpeg select frames using between

  17 décembre 2014, par skyuuka

  I use the following command to select the 18 to 22 frames of an video :

  ffmpeg -i input_video.avi -vf "select=between(n\,18\,22)" -f image2 frames_%3d.png

  But I get the following errors :

  Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      creation_time   : 2013-01-04 21:17:15
  
      encoder         : 6.0.1
  
      encoder-eng     : 6.0.1
  
      date            : 2013-01-04T13:17:15-0800
  
      date-eng        : 2013-01-04T13:17:15-0800
  
    Duration: 00:00:09.17, start: 0.000000, bitrate: 20766 kb/s
  
      Stream #0.0(und): Video: h264 (Baseline), yuv420p, 1920x1080, 20765 kb/s, 29.97 fps, 29.97 tbr, 600 tbn, 1200 tbc
  
      Metadata:
  
        creation_time   : 2013-01-04 21:17:15
  
      Stream #0.1(und): Audio: aac, 44100 Hz, mono, s16, 61 kb/s
  
      Metadata:
  
        creation_time   : 2013-01-04 21:17:15
  
  Incompatible pixel format 'yuv420p' for codec 'png', auto-selecting format 'rgb24'
  
  [buffer @ 0x2589ac0] w:1920 h:1080 pixfmt:yuv420p
  
  [select @ 0x259da00] [Eval @ 0x7fff7a38e940] Missing ')' or too many args in 'between(n,18,22)'
  
  [select @ 0x259da00] Error while parsing expression 'between(n,18,22)'
  
  Error initializing filter 'select' with args 'between(n,18,22)'
  
  Error opening filters!