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• Obtain the filtered keyframe screenshot from the video

  18 janvier 2023, par shsf

  I want to get keyframe images from the video ;In order to get the main plot of the video ;

  


  I would like to restrict keyframe generation ; For example, only one keyframe is taken every 7s or every 3s ;

  


  (In addition to generating all the key frame images. And then filter it based on pts time. Is there any other way ?)

  


  The following command can restrict pts to multiples of n(such as 7).

  


  ffmpeg -y  -i   15103.mp4    -vf "select='eq(pict_type,PICT_TYPE_I)*not(mod(n,7))'"  -vsync vfr -s 480x270 -frame_pts true p2/out-%d.png

  


  But it's still not quite what I need. I need to get one keyframe if there are key frames in these seconds. Or get zero keyframe if there is no keyframe in these seconds.

  


  How do I modify the command ?

  


  ffmpeg -y  -i   15103.mp4    -vf "select='eq(pict_type,PICT_TYPE_I)'"  -vsync vfr -s 480x270 -frame_pts true p2/out-%d.png

  


• How to get ffprobe metadata as variable to parse in python

  29 avril 2021, par connor449

  When I run ffprobe <video></video>, I get the standard metadata as below :

  


  ffprobe version 4.3.1 Copyright (c) 2007-2020 the FFmpeg developers
  built with Apple clang version 11.0.3 (clang-1103.0.32.62)
  configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-librsvg --enable-libtheora --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libsoxr --enable-libspeex --enable-libass --enable-libbluray --enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype --enable-libfribidi --disable-libjack --disable-libopencore-amrnb --disable-libopencore-amrwb --disable-libxcb --disable-libxcb-shm --disable-libxcb-xfixes --disable-indev=jack --enable-opencl --disable-outdev=xv --enable-audiotoolbox --enable-videotoolbox --enable-sdl2 --disable-securetransport --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --enable-libdav1d --arch=x86_64 --enable-x86asm --enable-libx265 --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../directConversion/200mbs105_55.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:01:12.43, start: 0.000000, bitrate: 213963 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1080x1920 [SAR 1:1 DAR 9:16], 213828 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : Core Media Video
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : Core Media Audio



  


  I want to get this information from python so I can parse this output and use some of it in my code. However, I can't get this to work.

  


  I have tried the following :

  


  data = subprocess.call(f'ffprobe {video}', shell=True)
data = subprocess.check_output(f'ffprobe {vid}', shell=True)
data = subprocess.Popen(f'ffprobe {vid}', shell=True)
data = subprocess. Popen(f'ffprobe {vid}', stdout=subprocess.PIPE ).communicate()[0]
data = run(f'ffprobe {vid}', capture_output=True).stdout


  


  If I include shell=True, then the proper information prints in the terminal but I get an empty string for data. For commands without shell=True I get file not found error and it breaks. What should I do ? I got all of these solutions from SO and they seem to work for others.

  


• Any video format to mp4 using ffmpeg in C#

  8 juin 2015, par Sangeetha

  I am converting any format videos to mp4 format in following way using FFMPEG in c# application,

  string targetFilePath = Path.Combine(_file + @"\ffmpeg\", "ffmpeg.exe");
  
              string ffmpegargs = "";
  
              if (exten == "flv")
  
              {
  
                  ffmpegargs = " -i " + inputFileName + " -acodec libmp3lame -ar " + samplingrate + " -ab " + bitrate + " -f flv -s " + size + " " + outputFileName;
  
              }
  
              else
  
              {
  
                  ffmpegargs = " -i " + inputFileName + " " + outputFileName;
  
              }
  
             //string ffmpegargs = " -y -i " + inputFileName + " -b 2000k "+ outputFileName;
  
              System.Diagnostics.Process pProcess = new Process();
  
              pProcess.StartInfo.FileName = targetFilePath;
  
              pProcess.StartInfo.UseShellExecute = false;
  
              pProcess.StartInfo.RedirectStandardOutput = true;
  
              pProcess.StartInfo.CreateNoWindow = true;
  
              pProcess.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
  
              pProcess.StartInfo.Arguments = ffmpegargs;
  
              pProcess.EnableRaisingEvents = true;
  
              pProcess.Start();
  
              pProcess.WaitForExit();
  
              pProcess.Close();
  
              pProcess.Dispose();
  
              pProcess = null;

  It works fine when convert from flv file. But when convert an avi or f4v file, able to save mp4 format in temp file. But when try to identify the file in following way it throws avformatcontext return memory corruption error.

  IntPtr pFormatContext;
  
              FFmpeg.av_register_all();
  
  
  
              int ret;
  
  ret = FFmpeg.av_open_input_file(out pFormatContext, this.Filename, IntPtr.Zero, 0, IntPtr.Zero);
  
  ret = FFmpeg.av_find_stream_info(pFormatContext); 

  Throws memory corruption in the following line,

  ret = FFmpeg.av_find_stream_info(pFormatContext) ;

  What could be the reason, Or what is the mistake i am making here.

  Regards