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• Adding images to the end of the video

  13 janvier 2014, par Kaushik DB

  common_video.avi
  image1.jpg
  image2.jpg

  i want to insert these two images to the end of the video name common_video.avi programatically in c# so that the image shows for like 5 seconds after the video ends, what's the best way to achieve it ? I have looked in to ffmpeg, with and without c# wrappers, but still nothing works. I keep getting errors and exceptions.

  here's a piece of code i have tried

  using System;
  
  using System.Collections.Generic;
  
  using System.Linq;
  
  using System.Text;
  
  using System.Threading;
  
  //using AForge;
  
  //using AForge.Video.VFW;
  
  using AForge.Video.FFMPEG;
  
  using AviFile;
  
  using System.Drawing;
  
  
  
  namespace Ffmpeg
  
  {
  
      class Program
  
      {
  
          static void Main(string[] args)
  
          {
  
  
  
  
  
  
  
  
  
  
  
  
  
              var Strings = new string[] { "1.jpg", "2.jpg", "3.jpg" };
  
  
  
              //VideoFileWriter W = new VideoFileWriter();
  
              //W.Open("../../Out/new.avi", 1920, 1200, 1, VideoCodec.Raw, 4400);
  
              //foreach (var S in Strings)
  
              //{
  
              //    for (int I = 2 * 25; I > 0; I--)
  
              //        W.WriteVideoFrame((Bitmap)Image.FromFile(S));
  
              //}
  
              //W.Close();
  
  
  
  
  
  
  
              //load the first image
  
              Bitmap bitmap = (Bitmap)Image.FromFile(Strings[0]);
  
              //create a new AVI file
  
              AviManager aviManager =
  
                  new AviManager(@"..\..\out\new.avi", false);
  
              //add a new video stream and one frame to the new file
  
              VideoStream aviStream =
  
                  aviManager.AddVideoStream(false, 1, bitmap);
  
  
  
              //Bitmap bitmap;
  
              for (int n = 1; n < Strings.Length; n++)
  
              {
  
                  if (Strings[n].Trim().Length > 0)
  
                  {
  
                      bitmap =
  
                         (Bitmap)Bitmap.FromFile(Strings[n]);
  
                      //for (int I = 2 * 25; I > 0; I--)
  
                          aviStream.AddFrame(bitmap);
  
                      bitmap.Dispose();
  
                  }
  
              }
  
              aviManager.Close();
  
          }
  
      }
  
  }

  Ffmpeg throws : "error configuring filters" ;

• Getting Audio and Video from Steams

  16 novembre 2018, par anon

  I’m trying to download a video from BritBox. After observing my network packets, it seems they stream the video in .m4s fragments.

  I’ve looked into InviDownloader, but can’t seem to get it to pick up all the pieces. I don’t think I’m giving it the correct URL but can’t find the correct one either. I’ve taken a look at this question but I think it requires a specific URL as well, which I can’t seem to find.

  Most fragments (if not all) have a .dash extension, so I tried to get it working with GPAC’s dashcast but couldn’t get that working either. I’ve also seen Handbrake being thrown around but haven’t tried it.

  After trying tons of browser extensions, I found one that can correctly piece together the .m4s files, at least to an extent. If you carefully refresh the extension when new packets are downloaded, you can download a result of the entire .m4s.

  Then, using youtube-dl and ffmpeg you can convert it to an mp4 file. However, this has no audio.

  I’m not too savvy when it comes to videos or streaming. Is there an easy way to download these videos to an mp4 format with audio ?

• Read/write to stream with JavaCV

  4 juillet 2013, par Zielony

  I'm trying to make use of JavaCV for android. I would like to create a video stream composed of screenshots. I found out that I can write a file using FFmpegFrameRecorder, but I can't write to a stream, array, buffer, or anything else, other than a file.

  Next thing is that I found a piece of code featuring custom FrameRecorder using 'avio_alloc_context' and read/write/seek callbacks. Unfortunately it's only a snippet and it's in C++. 'avio_alloc_context' method on android takes Read_packet, Read_packet and Seek callbacks, so I cannot pass a Write_packet callback. Moreover, right after 'avio_alloc_context' call, I get 'finalize' called on all objects passed to 'avio_alloc_context'.

  final VideoOutputStream videoOutputStream = new VideoOutputStream(stream);
  
  
  
  Read_packet read_packet = new Read_packet() {
  
      @Override
  
      public int call(Pointer arg0, BytePointer arg1, int arg2) {
  
          VideoOutputStream videoStream = (VideoOutputStream) arg0;
  
          try {
  
              videoStream.write(arg1.getStringBytes());
  
          } catch (IOException e) {
  
              e.printStackTrace();
  
          }
  
          return arg2;
  
      }
  
  };
  
  
  
  AVIOContext pb = avio_alloc_context(new MBytePointer(av_malloc(video_outbuf_size)), video_outbuf_size, 1,videoOutputStream, null, read_packet, null);
  
  
  
  oc.pb(pb);

  Using the above code nothing crashes nor reports errors. I just keep getting empty files.

  My question is - does anyone of you guys managed to get it working ? Do you know a correct way to initialize custom reading/writing in FrameRecorder/Grabber in JavaCV ?