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• When using ffmpeg.exe to create video from sequence of images the result is avi file that show green color why ?

  9 janvier 2014, par user3163653

  In Form1 im taking screenshots of my screen I checked they are ok i save them to the hard disk and see they are ok.

  private void timer1_Tick(object sender, EventArgs e)
  
          {
  
  
  
              using (bitmap = (Bitmap)ScreenCapture.CaptureScreen(true))
  
              {
  
  
  
              Image mScreenImage = new Bitmap(Screen.PrimaryScreen.Bounds.Width,
  
                                       Screen.PrimaryScreen.Bounds.Height);
  
              Graphics g = Graphics.FromImage(bitmap);
  
              g.CopyFromScreen(0, 0, 0, 0, new Size(bitmap.Width, bitmap.Height));
  
              g.Dispose();
  
                  bitmap.Save(@"D:\Testbmp\" + counter.ToString("D6") + ".jpg", ImageFormat.Jpeg);
  
                  counter++;
  
              ffmp.PushFrame((Bitmap)mScreenImage);
  
  
  
              }
  
  
  
          }

  Then in the new class ffmp im using pipe to get the screenshots and build the avi file in real time :

  using System;
  
  using System.Windows.Forms;
  
  using System.Collections.Generic;
  
  using System.Linq;
  
  using System.Text;
  
  using System.Threading.Tasks;
  
  using System.Drawing;
  
  using System.IO.Pipes;
  
  using System.Runtime.InteropServices;
  
  using System.Diagnostics;
  
  using System.IO;
  
  
  
  namespace ScreenVideoRecorder
  
  {
  
      class Ffmpeg
  
      {
  
          NamedPipeServerStream p;
  
          String pipename = "mytestpipe";
  
          System.Diagnostics.Process process;
  
          string ffmpegFileName = "ffmpeg.exe";
  
          string workingDirectory;
  
  
  
          public Ffmpeg()
  
          {
  
              workingDirectory = Path.GetDirectoryName(Application.ExecutablePath);
  
              Logger.Write("workingDirectory: " + workingDirectory);
  
              if (!Directory.Exists(workingDirectory))
  
              {
  
                  Directory.CreateDirectory(workingDirectory);
  
              }
  
              ffmpegFileName = Path.Combine(workingDirectory, ffmpegFileName);
  
              Logger.Write("FfmpegFilename: " + ffmpegFileName);
  
          }
  
  
  
          public void Start(string pathFileName, int BitmapRate)
  
          {
  
              try
  
              {
  
  
  
                  string outPath = pathFileName;
  
                  p = new NamedPipeServerStream(pipename, PipeDirection.Out, 1, PipeTransmissionMode.Byte);
  
  
  
                  ProcessStartInfo psi = new ProcessStartInfo();
  
                  psi.WindowStyle = ProcessWindowStyle.Hidden;
  
                  psi.UseShellExecute = false;
  
                  psi.CreateNoWindow = false;
  
                  psi.FileName = ffmpegFileName;
  
                  psi.WorkingDirectory = workingDirectory;
  
                  psi.Arguments = @"-f rawvideo -pix_fmt yuv420p -video_size 1920x1080 -i \\.\pipe\mytestpipe -map 0 -c:v mpeg4 -r " + BitmapRate + " " + outPath;
  
                  process = Process.Start(psi);
  
                  process.EnableRaisingEvents = false;
  
                  psi.RedirectStandardError = true;
  
                  p.WaitForConnection();
  
              }
  
              catch (Exception err)
  
              {
  
                  Logger.Write("Exception Error: " + err.ToString());
  
              }
  
          }
  
  
  
          public void PushFrame(Bitmap bmp)
  
          {
  
              try
  
              {
  
                  int length;
  
                  // Lock the bitmap's bits.
  
                  //bmp = new Bitmap(1920, 1080);
  
                  Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
  
                  //Rectangle rect = new Rectangle(0, 0, 1280, 720);
  
                  System.Drawing.Imaging.BitmapData bmpData =
  
                      bmp.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadOnly,
  
                      bmp.PixelFormat);
  
  
  
                  int absStride = Math.Abs(bmpData.Stride);
  
                  // Get the address of the first line.
  
                  IntPtr ptr = bmpData.Scan0;
  
  
  
                  // Declare an array to hold the bytes of the bitmap.
  
                  //length = 3 * bmp.Width * bmp.Height;
  
                  length = absStride * bmpData.Height;
  
                  byte[] rgbValues = new byte[length];
  
  
  
                  //Marshal.Copy(ptr, rgbValues, 0, length);
  
                  int j = bmp.Height - 1;
  
                  for (int i = 0; i < bmp.Height; i++)
  
                  {
  
                      IntPtr pointer = new IntPtr(bmpData.Scan0.ToInt32() + (bmpData.Stride * j));
  
                      System.Runtime.InteropServices.Marshal.Copy(pointer, rgbValues, absStride * (bmp.Height - i - 1), absStride);
  
                      j--;
  
                  }
  
                  p.Write(rgbValues, 0, length);
  
                  bmp.UnlockBits(bmpData);
  
              }
  
              catch(Exception err)
  
              {
  
                  Logger.Write("Error: " + err.ToString());
  
              }
  
  
  
          }
  
  
  
          public void Close()
  
          {
  
              p.Close();
  
          }
  
      }
  
  }

  This is the arguments im using now :

  psi.Arguments = @"-f rawvideo -pix_fmt yuv420p -video_size 1920x1080 -i \\.\pipe\mytestpipe -map 0 -c:v mpeg4 -r " + BitmapRate + " " + outPath;

  Before that I tried to use libx264 instead the mpeg4 but it didn't create the avi file good.
  The problem is that the avi file on the hard disk when I play it show just green color.
  I can play any other avi files on my hard disk but when playing this avi file I see green.

  

  And this is what I see when im playing the avi file :

  

  I tried to use Gspot to find if I need any codec to install and this is what I see :

  

  And I have ffdshow installed already so what should I do now ?

• Batch screenshots with FFmpeg

  20 juillet 2017, par cCanuck

  I have this bat file that works with another software and I would like to modify it to work with FFmpeg but I haven’t been able to get the syntax or arguments correct

  I essentially have a series of 1hr videos on an external HDD I want to extract an screenshot every 15mins to folder on my computer. I could do it successfully with FFmpeg from the CMD but not in a bat file.

  @echo off
  
  pause
  
  
  
  FOR /F "tokens=*" %%A IN ('dir E:\BIW\*.asf /b') DO "c:\Program Files (x86)\FrameShots3\fsconsole.exe" -ms 900000 -width 1920 -height 1080 -filetype JPEG -filename BIW_ -filecounter 0000 "E:\BIW\%%A" "C:\timelapse\BIW\"
  
  pause

• Video rotating to left by 90 degree when converted using ffmpeg

  15 juillet 2017, par Herdesh Verma

  I developed a below code :

  extern "C"
  
  {
  
  #include <libavutil></libavutil>imgutils.h>
  
  #include <libavutil></libavutil>opt.h>
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavutil></libavutil>mathematics.h>
  
  #include <libavutil></libavutil>samplefmt.h>
  
  #include <libavutil></libavutil>timestamp.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libavfilter></libavfilter>avfiltergraph.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  }
  
  #include 
  
  static AVFormatContext *fmt_ctx = NULL;
  
  
  
  static int frame_index = 0;
  
  
  
  static int j = 0, nbytes=0;
  
  uint8_t *video_outbuf = NULL;
  
  static AVPacket *pAVPacket=NULL;
  
  static int value=0;
  
  static AVFrame *pAVFrame=NULL;
  
  static AVFrame *outFrame=NULL;
  
  static AVStream *video_st=NULL;
  
  static AVFormatContext *outAVFormatContext=NULL;
  
  static AVCodec *outAVCodec=NULL;
  
  static AVOutputFormat *output_format=NULL;
  
  static AVCodecContext *video_dec_ctx = NULL, *audio_dec_ctx;
  
  static AVCodecContext *outAVCodecContext=NULL;
  
  static int width, height;
  
  static enum AVPixelFormat pix_fmt;
  
  static AVStream *video_stream = NULL, *audio_stream = NULL;
  
  static const char *src_filename = NULL;
  
  static const char *video_dst_filename = NULL;
  
  static const char *audio_dst_filename = NULL;
  
  static FILE *video_dst_file = NULL;
  
  static FILE *audio_dst_file = NULL;
  
  static uint8_t *video_dst_data[4] = {NULL};
  
  static int      video_dst_linesize[4];
  
  static int video_dst_bufsize;
  
  static int video_stream_idx = -1, audio_stream_idx = -1;
  
  static AVPacket *pkt=NULL;
  
  static AVPacket *pkt1=NULL;
  
  static AVFrame *frame = NULL;
  
  //static AVPacket pkt;
  
  static int video_frame_count = 0;
  
  static int audio_frame_count = 0;
  
  static int refcount = 0;
  
  AVCodec *codec;
  
  static struct SwsContext *sws_ctx;
  
  AVCodecContext *c= NULL;
  
   int i, out_size, size, x, y, outbuf_size;
  
   AVFrame *picture;
  
   uint8_t *outbuf, *picture_buf;
  
  int video_outbuf_size;
  
  int w, h;
  
  AVPixelFormat pixFmt;
  
  uint8_t *data[4];
  
  int linesize[4];
  
  
  
  static int open_codec_context(int *stream_idx,
  
                            AVCodecContext **dec_ctx, AVFormatContext 
  
  *fmt_ctx, enum AVMediaType type)
  
  {
  
  int ret, stream_index;
  
  AVStream *st;
  
  AVCodec *dec = NULL;
  
  AVDictionary *opts = NULL;
  
  ret = av_find_best_stream(fmt_ctx, type, -1, -1, NULL, 0);
  
  if (ret &lt; 0) {
  
      printf("Could not find %s stream in input file '%s'\n",
  
              av_get_media_type_string(type), src_filename);
  
      return ret;
  
  } else {
  
      stream_index = ret;
  
      st = fmt_ctx->streams[stream_index];
  
      /* find decoder for the stream */
  
      dec = avcodec_find_decoder(st->codecpar->codec_id);
  
      if (!dec) {
  
          printf("Failed to find %s codec\n",
  
                  av_get_media_type_string(type));
  
          return AVERROR(EINVAL);
  
      }
  
      /* Allocate a codec context for the decoder */
  
      *dec_ctx = avcodec_alloc_context3(dec);
  
      if (!*dec_ctx) {
  
          printf("Failed to allocate the %s codec context\n",
  
                  av_get_media_type_string(type));
  
          return AVERROR(ENOMEM);
  
      }
  
      /* Copy codec parameters from input stream to output codec context */
  
      if ((ret = avcodec_parameters_to_context(*dec_ctx, st->codecpar)) &lt; 0) {
  
          printf("Failed to copy %s codec parameters to decoder context\n",
  
                  av_get_media_type_string(type));
  
          return ret;
  
      }
  
      /* Init the decoders, with or without reference counting */
  
      av_dict_set(&amp;opts, "refcounted_frames", refcount ? "1" : "0", 0);
  
      if ((ret = avcodec_open2(*dec_ctx, dec, &amp;opts)) &lt; 0) {
  
          printf("Failed to open %s codec\n",
  
                  av_get_media_type_string(type));
  
          return ret;
  
      }
  
      *stream_idx = stream_index;
  
  }
  
  return 0;
  
  }
  
  
  
  
  
  
  
  int main (int argc, char **argv)
  
  {
  
   int ret = 0, got_frame;
  
  src_filename = argv[1];
  
  video_dst_filename = argv[2];
  
  audio_dst_filename = argv[3];
  
  av_register_all();
  
  avcodec_register_all();
  
  printf("Registered all\n");
  
  
  
  /* open input file, and allocate format context */
  
  if (avformat_open_input(&amp;fmt_ctx, src_filename, NULL, NULL) &lt; 0) {
  
      printf("Could not open source file %s\n", src_filename);
  
      exit(1);
  
  }
  
  
  
  /* retrieve stream information */
  
  if (avformat_find_stream_info(fmt_ctx, NULL) &lt; 0) {
  
      printf("Could not find stream information\n");
  
      exit(1);
  
  }
  
  
  
  if (open_codec_context(&amp;video_stream_idx, &amp;video_dec_ctx, fmt_ctx, 
  
  AVMEDIA_TYPE_VIDEO) >= 0) {
  
      video_stream = fmt_ctx->streams[video_stream_idx];
  
      avformat_alloc_output_context2(&amp;outAVFormatContext, NULL, NULL, 
  
  video_dst_filename);
  
      if (!outAVFormatContext)
  
      {
  
              printf("\n\nError : avformat_alloc_output_context2()");
  
              return -1;
  
      }
  
  }
  
  
  
  if (open_codec_context(&amp;audio_stream_idx, &amp;audio_dec_ctx, fmt_ctx, 
  
  AVMEDIA_TYPE_AUDIO) >= 0) {
  
      audio_stream = fmt_ctx->streams[audio_stream_idx];
  
      audio_dst_file = fopen(audio_dst_filename, "wb");
  
      if (!audio_dst_file) {
  
          printf("Could not open destination file %s\n", audio_dst_filename);
  
          ret = 1;
  
          goto end;
  
      }
  
  }
  
  /* dump input information to stderr */
  
  av_dump_format(fmt_ctx, 0, src_filename, 0);
  
  
  
  if (!audio_stream &amp;&amp; !video_stream) {
  
      printf("Could not find audio or video stream in the input, aborting\n");
  
      ret = 1;
  
      goto end;
  
  }
  
  
  
      output_format = av_guess_format(NULL, video_dst_filename, NULL);
  
      if( !output_format )
  
      {
  
       printf("\n\nError : av_guess_format()");
  
       return -1;
  
      }
  
  
  
      video_st = avformat_new_stream(outAVFormatContext ,NULL);
  
      if( !video_st )
  
      {
  
              printf("\n\nError : avformat_new_stream()");
  
        return -1;
  
      }
  
  
  
      outAVCodecContext = avcodec_alloc_context3(outAVCodec);
  
      if( !outAVCodecContext )
  
      {
  
        printf("\n\nError : avcodec_alloc_context3()");
  
        return -1;
  
      }
  
  
  
  
  
      outAVCodecContext = video_st->codec;
  
      outAVCodecContext->codec_id = AV_CODEC_ID_MPEG4;// AV_CODEC_ID_MPEG4; // 
  
   AV_CODEC_ID_H264 // AV_CODEC_ID_MPEG1VIDEO
  
      outAVCodecContext->codec_type = AVMEDIA_TYPE_VIDEO;
  
      outAVCodecContext->pix_fmt  = AV_PIX_FMT_YUV420P;
  
      outAVCodecContext->bit_rate = 400000; // 2500000
  
      outAVCodecContext->width = 1920;
  
      //outAVCodecContext->width = 500;
  
      outAVCodecContext->height = 1080;
  
      //outAVCodecContext->height = 500;
  
      outAVCodecContext->gop_size = 3;
  
      outAVCodecContext->max_b_frames = 2;
  
      outAVCodecContext->time_base.num = 1;
  
      outAVCodecContext->time_base.den = 30; // 15fps
  
  
  
      if (outAVCodecContext->codec_id == AV_CODEC_ID_H264)
  
      {
  
       av_opt_set(outAVCodecContext->priv_data, "preset", "slow", 0);
  
      }
  
  
  
      outAVCodec = avcodec_find_encoder(AV_CODEC_ID_MPEG4);
  
      if( !outAVCodec )
  
      {
  
       printf("\n\nError : avcodec_find_encoder()");
  
       return -1;
  
      }
  
  
  
      /* Some container formats (like MP4) require global headers to be 
  
   present
  
         Mark the encoder so that it behaves accordingly. */
  
  
  
      if ( outAVFormatContext->oformat->flags &amp; AVFMT_GLOBALHEADER)
  
      {
  
              outAVCodecContext->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
  
      }
  
  
  
      value = avcodec_open2(outAVCodecContext, outAVCodec, NULL);
  
      if( value &lt; 0)
  
      {
  
              printf("\n\nError : avcodec_open2()");
  
              return -1;
  
      }
  
  
  
  /* create empty video file */
  
      if ( !(outAVFormatContext->flags &amp; AVFMT_NOFILE) )
  
      {
  
       if( avio_open2(&amp;outAVFormatContext->pb , video_dst_filename, 
  
  AVIO_FLAG_WRITE ,NULL, NULL) &lt; 0 )
  
       {
  
        printf("\n\nError : avio_open2()");
  
       }
  
      }
  
  
  
      if(!outAVFormatContext->nb_streams)
  
      {
  
              printf("\n\nError : Output file dose not contain any stream");
  
        return -1;
  
      }
  
  
  
      /* imp: mp4 container or some advanced container file required header 
  
   information*/
  
      value = avformat_write_header(outAVFormatContext , NULL);
  
      if(value &lt; 0)
  
      {
  
              printf("\n\nError : avformat_write_header()");
  
              return -1;
  
      }
  
  
  
      printf("\n\nOutput file information :\n\n");
  
      av_dump_format(outAVFormatContext , 0 ,video_dst_filename ,1);
  
  
  
  
  
      int flag;
  
      int frameFinished;
  
  
  
  
  
      value = 0;
  
  
  
      pAVPacket = (AVPacket *)av_malloc(sizeof(AVPacket));
  
      av_init_packet(pAVPacket);
  
  
  
      pAVFrame = av_frame_alloc();
  
      if( !pAVFrame )
  
      {
  
       printf("\n\nError : av_frame_alloc()");
  
       return -1;
  
      }
  
  
  
      outFrame = av_frame_alloc();//Allocate an AVFrame and set its fields to 
  
   default values.
  
      if( !outFrame )
  
      {
  
       printf("\n\nError : av_frame_alloc()");
  
       return -1;
  
      }
  
  
  
      nbytes = av_image_get_buffer_size(outAVCodecContext-
  
   >pix_fmt,outAVCodecContext->width,outAVCodecContext->height,32);
  
      video_outbuf = (uint8_t*)av_malloc(nbytes);
  
      if( video_outbuf == NULL )
  
      {
  
      printf("\n\nError : av_malloc()");
  
      }
  
  
  
  
  
      value = av_image_fill_arrays( outFrame->data, outFrame->linesize, 
  
   video_outbuf , AV_PIX_FMT_YUV420P, outAVCodecContext-
  
   >width,outAVCodecContext->height,1 ); // returns : the size in bytes 
  
   required for src
  
      if(value &lt; 0)
  
      {
  
      printf("\n\nError : av_image_fill_arrays()");
  
      }
  
  
  
      SwsContext* swsCtx_ ;
  
  
  
      // Allocate and return swsContext.
  
      // a pointer to an allocated context, or NULL in case of error
  
      // Deprecated : Use sws_getCachedContext() instead.
  
      swsCtx_ = sws_getContext(video_dec_ctx->width,
  
                              video_dec_ctx->height,
  
                              video_dec_ctx->pix_fmt,
  
                              video_dec_ctx->width,
  
                              video_dec_ctx->height,
  
                              video_dec_ctx->pix_fmt,
  
                              SWS_BICUBIC, NULL, NULL, NULL);
  
  
  
  
  
      AVPacket outPacket;
  
  
  
      int got_picture;
  
  
  
      while( av_read_frame( fmt_ctx , pAVPacket ) >= 0 )
  
      {
  
              if(pAVPacket->stream_index == video_stream_idx)
  
              {
  
                      value = avcodec_decode_video2(video_dec_ctx , pAVFrame , 
  
    &amp;frameFinished , pAVPacket );
  
                      if( value &lt; 0)
  
                      {
  
                              printf("Error : avcodec_decode_video2()");
  
                      }
  
  
  
                      if(frameFinished)// Frame successfully decoded :)
  
                      {
  
                              sws_scale(swsCtx_, pAVFrame->data, pAVFrame-
  
   >linesize,0, video_dec_ctx->height, outFrame->data,outFrame->linesize);
  
  //                              sws_scale(swsCtx_, pAVFrame->data, pAVFrame-
  
  >linesize,0, video_dec_ctx->height, outFrame->data,outFrame->linesize);
  
                              av_init_packet(&amp;outPacket);
  
                              outPacket.data = NULL;    // packet data will be 
  
   allocated by the encoder
  
                              outPacket.size = 0;
  
  
  
                              avcodec_encode_video2(outAVCodecContext , 
  
   &amp;outPacket ,outFrame , &amp;got_picture);
  
  
  
                              if(got_picture)
  
                              {
  
                                      if(outPacket.pts != AV_NOPTS_VALUE)
  
                                              outPacket.pts = 
  
   av_rescale_q(outPacket.pts, video_st->codec->time_base, video_st-
  
   >time_base);
  
                                      if(outPacket.dts != AV_NOPTS_VALUE)
  
                                              outPacket.dts = 
  
   av_rescale_q(outPacket.dts, video_st->codec->time_base, video_st-
  
   >time_base);
  
  
  
                                      printf("Write frame %3d (size= %2d)\n", 
  
   j++, outPacket.size/1000);
  
                                      if(av_write_frame(outAVFormatContext , 
  
   &amp;outPacket) != 0)
  
                                      {
  
                                              printf("\n\nError : 
  
   av_write_frame()");
  
                                      }
  
  
  
                              av_packet_unref(&amp;outPacket);
  
                              } // got_picture
  
  
  
                      av_packet_unref(&amp;outPacket);
  
                      } // frameFinished
  
  
  
              }
  
      }// End of while-loop
  
  
  
      value = av_write_trailer(outAVFormatContext);
  
      if( value &lt; 0)
  
      {
  
              printf("\n\nError : av_write_trailer()");
  
      }
  
  
  
  
  
      //THIS WAS ADDED LATER
  
      av_free(video_outbuf);
  
  
  
  end:
  
      avcodec_free_context(&amp;video_dec_ctx);
  
      avcodec_free_context(&amp;audio_dec_ctx);
  
      avformat_close_input(&amp;fmt_ctx);
  
      if (video_dst_file)
  
          fclose(video_dst_file);
  
     if (audio_dst_file)
  
         fclose(audio_dst_file);
  
     //av_frame_free(&amp;frame);
  
     av_free(video_dst_data[0]);
  
     return ret &lt; 0;
  
  }

  Problem with above code is that it rotates a video to left by 90 degree.

  Snapshot of video given as input to above program

  Snapshot of output video. It is rotated by 90 degree to left.

  I compiled program using below command :

  g++ -D__STDC_CONSTANT_MACROS -Wall -g ScreenRecorder.cpp -I/home/harry/Documents/compressor/ffmpeg-3.3/ -I/root/android-ndk-r14b/platforms/android-21/arch-x86_64/usr/include/ -c -o ScreenRecorder.o -w

  And linked it using below command :

  g++ -Wall -g ScreenRecorder.o -I/home/harry/Documents/compressor/ffmpeg-3.3/ -I/root/android-ndk-r14b/platforms/android-21/arch-x86_64/usr/include/ -L/usr/lib64 -L/lib64 -L/usr/lib/gcc/x86_64-redhat-linux/4.4.7/ -L/home/harry/Documents/compressor/ffmpeg-3.3/ffmpeg-build -L/root/android-ndk-r14b/platforms/android-21/arch-x86_64/usr/lib64 -o ScreenRecorder.exe -lavformat -lavcodec -lavutil -lavdevice -lavfilter -lswscale -lx264 -lswresample -lm -lpthread -ldl -lstdc++ -lc -lrt

  Program is being run using below command :

  ./ScreenRecorder.exe vertical.MOV videoH.mp4 audioH.mp3

  Note :
  - Source video is taken from iphone and is of .mov format.
  - Output video is being stored in .mp4 file.

  Can anyone please tell me why it is rotating video by 90 degree ?

  One thing i noticed in dump is shown below :

    Duration: 00:00:06.04, start: 0.000000, bitrate: 17087 kb/s
  
  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 17014 kb/s, 29.98 fps, 29.97 tbr, 600 tbn, 1200 tbc (default)
  
  Metadata:
  
    rotate          : 90
  
    creation_time   : 2017-07-09T10:56:42.000000Z
  
    handler_name    : Core Media Data Handler
  
    encoder         : H.264
  
  Side data:
  
    displaymatrix: rotation of -90.00 degrees

  it says displaymatrix: rotation of -90.00 degrees. Is it responsible for rotating video by 90 degree ?