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• How can i convert and compress in real time batch of images to mp4 video file ?

  29 juin 2015, par Brubaker Haim

  In my directory on the hard disk i have many images : screenshot000001.bmp , screenshot000002.bmp....screenshot001200.bmp

  I want to do two things :

  1. For testing using the cmd(Command Prompt) and to compress and convert the images to mp4 video file.

  2. In my program in real time while my program take the screenshots and save them to the hard disk to compress them and build the mp4 video file in real time.

  For the first part i tried to type in cmd :

  ffmpeg -f image2 -i screenshot%d.bmp -vcodec libx264 -b 800k video.avi

  But what i got is two errors :

  [image2 @ 0000000004766380] Could find no file with path ’screenshot%d.bmp’ and
  index in the range 0-4
  screenshot%d.bmp : No such file or directory

  I copied the ffmpeg.exe to the directory where the images are in.
  E :\screenshots

  For the second part this how i’m taking the screenshots in real time :

  A button click event that start a timer :

  private void button1_Click(object sender, EventArgs e)
  
          {
  
              timer1.Start();
  
          }

  Then in the tick event :

      ScreenShot shot = new ScreenShot();
  
      public static int counter = 0;
  
      private void timer1_Tick(object sender, EventArgs e)
  
      {
  
          counter++;
  
          shot.GetScreenShot(@"e:\screenshots\", "screenshot");
  
          if (counter == 1200)
  
          {
  
              timer1.Stop();
  
          }
  
      }

  This line shot.GetScreenShot(@"e :\screenshots\", "screenshot") ; save the screenshots to the hard disk.
  Here after each screenshot save i want to compress and build the mp4 video file in real time.

  I tried this and got errors :

  ffmpeg -f image2 -i screenshot%06d.bmp -vcodec libx264 -b 800k video.avi

  Error message :

  ffmpeg version N-73165-gf1e1730 Copyright (
  
    built with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-vers
  
  isynth --enable-bzlib --enable-fontconfig -
  
  le-iconv --enable-libass --enable-libbluray
  
  enable-libdcadec --enable-libfreetype --ena
  
  ibilbc --enable-libmodplug --enable-libmp3l
  
  le-libopencore-amrwb --enable-libopenjpeg -
  
  able-libschroedinger --enable-libsoxr --ena
  
  ble-libtwolame --enable-libvidstab --enable
  
   --enable-libvorbis --enable-libvpx --enabl
  
  e-libx264 --enable-libx265 --enable-libxavs
  
  ble-decklink --enable-zlib
  
    libavutil      54. 27.100 / 54. 27.100
  
    libavcodec     56. 45.100 / 56. 45.100
  
    libavformat    56. 38.102 / 56. 38.102
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 18.100 /  5. 18.100
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.100 /  1.  2.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  [bmp @ 0000000002f77ce0] bad magic number
  
      Last message repeated 3 times
  
  [image2 @ 0000000002f76380] decoding for st
  
  [image2 @ 0000000002f76380] Could not find
  
   bmp, none): unspecified size
  
  Consider increasing the value for the 'anal
  
  screenshot%06d.bmp: could not find codec pa
  
  Input #0, image2, from 'screenshot%06d.bmp'
  
    Duration: 00:00:02.88, start: 0.000000, b
  
      Stream #0:0: Video: bmp, none, 25 fps,
  
  Please use -b:a or -b:v, -b is ambiguous
  
  Codec AVOption b (set bitrate (in bits/s))
  
  vi) has not been used for any stream. The m
  
  e (e.g. a video option with no video stream
  
  some encoder which was not actually used fo
  
  Output #0, avi, to 'video.avi':
  
  Output file #0 does not contain any stream

• uwp app throw error when install from package but works fine in any mode when run directly launching from visual studio

  30 septembre 2020, par Abhishek Sharma

  I have created an app wrapping FFmpeg in uwp now for the requirement
I have all the major dll of FFmpeg and then set to content and copy always in property
now when I launch the app installed from the visual studio in any mode weather release, debug, x86,x64 it works fine but as I created a package and then install the app and run it, it throws an error where it says that dll not found not directly but says file not found which is because of dll because I face that problem in debug mode before and it's because of dll not available to uwp
you can look at the project here : https://github.com/AbhiSharma9350/Winfftool

  


• FFmpeg raw audio and H264 in RTSP

  21 août 2017, par Max Ridman

  Trying to grab correctly video and audio data from an IP camera Hikvision.

  Everything works like a charm when doing so for H264 + MP2 for example.

  When trying to grab RAW audio in PCM s16le - smile goes off of my face.

  Here is how I grab my camera :

  ffmpeg -re -acodec pcm_s16le -ac 1 -rtsp_transport tcp -i rtsp ://ipcameraaddress:554 -vcodec copy -acodec libfdk_aac -vbr 5 test.ts

  The command works and packs RTSP stream to a TS file.

  However the duration of audio and video is different. For an example, I am recording 21 sec, from that I have 21 sec of Audio and 15 of Video.

  The audio is being stretched and pitch is lowered. Have spent several days reading FFmpeg documentation and applied various options like async, changing sample rate and so on - no luck.

  I hope Mulvya or other FFmpeg experts will advice me a FIX to get things done correctly.