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• add localtime to each frame as metadata or subtitle while streaming use ffmpeg

  15 novembre 2019, par Mohammad M

  I want to encode some raw frames as nvenc_h264 and then stream it over UDP. What I need, now, is to add some data like capturing time to each frame as its metadata or subtitle(just for that frame or specifying in the metadata that it is just related to which frame.).

  now I use this command in C# to start FFmpeg for receiving raw frame using pipe and stream it over UDP.

            "-f rawvideo -vcodec rawvideo -pixel_format rgba"
  
            + " -colorspace bt709"
  
            + " -s " + width + "x" + height
  
            + " -framerate " + frameRate + " -vsync 0 "
  
            + " -loglevel warning -i - "// +// preset.GetOptions()
  
            + " -c:v h264_nvenc  -preset ll -zerolatency 1 -cq 10 -bf 2 -g 150 -f mpeg pipe:10" //udp://172.20.82.106:2000?"  //outputPath

  The base code that I used is here :
  https://github.com/keijiro/FFmpegOut

  and I use this command for receiving and saving the file :
  ffmpeg -i udp://127.0.0.1:2001 -c:v h264_nvenc video.mp4

  As I said I want the times as data that I can process it later, not just like a watermark on the frame. How can I add it ? is there any way ?

• Why psnr values generated by ffmpeg is inf？

  2 décembre 2020, par Lin Lingfeng

  I use ffmpeg to calcute PSNR value.
  
OS : Ubuntu-18.04
  
Commond :

  


  ffmpeg -i ../dataset/1080p-1k_rename/ggg_30_.jpg -i ../dataset/decode_dir_1k/ggg_30_.jpg -lavfi psnr="stats_file=./jpg_name.log" -f null -


  


  Result :

  


  ffmpeg version 4.3.1-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
...
...

Output #0, null, to 'pipe:':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: wrapped_avframe, yuvj420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default)
    Metadata:
      encoder         : Lavc58.91.100 wrapped_avframe
frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=1.74x    
video:1kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[Parsed_psnr_0 @ 0x7461800] PSNR y:46.226028 u:inf v:inf average:47.986940 min:47.986940 max:47.986940


  


  u:inf v:inf
Why U and V are inf ?

  


• Please use -q:a or -q:v, -qscale is ambiguous

  20 septembre 2017, par Abhishek

  I’m using FFMpeg to encode a video. This is the command :

  fmpeg/ffmpeg -i '/home/ninbizco/public_html/public/temporary/15cf7_8665.mp4'
  
      -ab 64k -ar 44100 -qscale 5 -r 25 -vcodec libx264 -acodec aac 
  
      -strict experimental -preset veryfast -f mp4 -vf "scale=480:386" -y 
  
      '/home/ninbizco/public_html/temporary/sitevideo/82_vconverted.1' 2>&1

  But I’m getting following error :

  Please use -q:a or -q:v, -qscale is ambiguous
  
  [AVFilterGraph @ 0x42838a0] Error initializing threading.
  
  [AVFilterGraph @ 0x42838a0] Error creating filter 'anull'
  
  Error opening filters!

  Following are the ffmpeg version details :

  ffmpeg version N-63893-gc69defd Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jul 16 2014 05:38:01 with gcc 4.6 (Debian 4.6.3-1)

  Can anyone tell me if it’s related to server configuration, because it’s not working on only one site and I’m not sure which server configuration to check. This command works fine on my localhost and other sites with the same ffmpeg version.