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• avcodec/v4l2_m2m_enc : buffer frame if it cannot be enqueued

  23 août 2020, par Andriy Gelman

  avcodec/v4l2_m2m_enc : buffer frame if it cannot be enqueued
  Currently if the frame buffers are full, the frame is unrefed and
  
  dropped.  Instead buffer the frame so that it is enqueued in the
  
  next v4l2_receive_packet() call.  The behavior was observed on
  
  DragonBoard 410c.
  Signed-off-by : Andriy Gelman <andriy.gelman@gmail.com>
  

  • [DH] libavcodec/v4l2_m2m.c
  • [DH] libavcodec/v4l2_m2m_enc.c

• FFMPEG merging audio and video to get resulting video

  26 septembre 2016, par King

  I need to merge audio and video using ffmpeg so that, it should result in a video with the same duration as of audio.

  I have tried 2 commands for that requirement in my linux terminal. Both the commands work for a few of the input videos ; but for some other input_videos, they produce output same as the input video, the audio doesn’t get merged.

  The commands, I have tried are -

  ffmpeg -i wonders.mp4 -i Carefull.mp3 -c copy testvid.mp4

  and

  ffmpeg -i wonders.mp4 -i Carefull.mp3 -strict -2 testvid.mp4

  and

  ffmpeg -i video.mp4 -i audio.wav -c:v copy -c:a aac -strict
  experimental output.mp4

  and these are my input videos -

  1. samplevid.mp4

  https://vid.me/z44E

  duration - 28 seconds

  size - 1.1 MB

  status - working

  And

  2. wonders.mp4

  https://vid.me/gyyB

  duration - 97 seconds

  size - 96 MB

  status - not working

  I have observed that the large size (more than 2MB) of the input video is probably the issue.

  But, still I want the fix.

• Converting videos to flv using ffmpeg

  6 janvier 2012, par user703526

  In my c# application, i am writing code for converting any video format to flv format. For this FFMPEG is used.

  Some times an exceptions is occuring like :

  Attempted to read or write protected memory. This is often an indication that other memory is corrupt

  Below is my code from where the exception throwing,

      IntPtr pFormatContext;
  
      FFmpeg.av_register_all();
  
  
  
      int ret;
  
      ret = FFmpeg.av_open_input_file(out pFormatContext, this.Filename, IntPtr.Zero, 0, IntPtr.Zero);
  
  
  
      if (ret < 0)
  
      {
  
          Trace.WriteLine("couldn't open input file");
  
  
  
          FFmpeg.av_free_static();
  
          return;
  
      }
  
  
  
  
  
      try
  
      {
  
          ret = FFmpeg.av_find_stream_info(pFormatContext);
  
  
  
          if (ret < 0)
  
          {
  
              Trace.WriteLine("couldnt find stream informaion");
  
              FFmpeg.av_close_input_file(pFormatContext);
  
              FFmpeg.av_free_static();
  
              return;
  
          }
  
  
  
  
  
          FFmpeg.AVFormatContext formatContext = (FFmpeg.AVFormatContext)Marshal.PtrToStructure(pFormatContext, typeof(FFmpeg.AVFormatContext));
  
  
  
          Duration = formatContext.duration / FFmpeg.AV_TIME_BASE;
  
  
  
          for (int i = 0; i < formatContext.nb_streams; ++i)
  
          {
  
              FFmpeg.AVStream stream = (FFmpeg.AVStream)Marshal.PtrToStructure(formatContext.streams[i], typeof(FFmpeg.AVStream));
  
              FFmpeg.AVCodecContext codec = (FFmpeg.AVCodecContext)Marshal.PtrToStructure(stream.codec, typeof(FFmpeg.AVCodecContext));
  
  
  
              if (codec.codec_type == FFmpeg.CodecType.CODEC_TYPE_VIDEO)
  
              {
  
                  Height = codec.height;
  
                  Width = codec.width;
  
  
  
                          Type = FileType.flv;
  
                          MimeType = "video/x-flv";
  
  
  
              }
  
  
  
          }
  
      }
  
      catch (Exception ex)
  
      {
  
          Trace.WriteLine("FFMpeg failed to understand the file");
  
      }
  
  
  
      FFmpeg.av_close_input_file(pFormatContext);
  
      FFmpeg.av_free_static();
  
  }

  And from the above code this ret = FFmpeg.av_find_stream_info(pFormatContext); line throws memory corrupt exception.
  Please help me to solve this issue.