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• fftools/ffmpeg_opt : Document VAAPI -device usage for DirectX Adapter

  14 avril 2023, par Sil Vilerino

  fftools/ffmpeg_opt : Document VAAPI -device usage for DirectX Adapter
  Initial review at https://github.com/intel-media-ci/ffmpeg/pull/619/
  Signed-off-by : Sil Vilerino <sivileri@microsoft.com>
  
  Reviewed-by : Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>
  
  Reviewed-by : Wu, Tong1 <tong1.wu@intel.com>
  

  • [DH] doc/ffmpeg.texi
  • [DH] fftools/ffmpeg_opt.c

• screen recorder by using accord.net

  12 juin 2020, par mohammad

  I tried to creat screen recorder by ussing accord.ffmpeg when run project it show this error :

  



  


  An unhandled exception of type 'System.AccessViolationException' occurred in Accord.Video.FFMPEG.dll
 Additional information : Attempted to read or write protected memory. This is often an indication that other memory is corrupt

  


  



  At line :

  



  FileWriter.WriteAudioFrame(e.Signal.RawData);


  



  Full Code :

  



  using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Accord;
using Accord.Video;
using Accord.Video.FFMPEG;
using System.Diagnostics;
using System.Threading;
using Accord.DirectSound;
using Accord.Audio;
using System.IO;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        VideoFileWriter FileWriter;
        Stopwatch stopwatch = new Stopwatch();
        AudioCaptureDevice audioDevice;
        int frameTime;
        int totalTime;
        Thread recorderTherad;
        bool start;

        /// diemntion of screen
        int x = 1280;
        int y = 800;

        private void button1_Click(object sender, EventArgs e)
        {
            //Start recorder

            AudioDeviceInfo info = null;
            var adc = new AudioDeviceCollection(AudioDeviceCategory.Capture);
            foreach (var ad in adc)
            {
                string desc = ad.Description;
                if (desc.IndexOf("Audio") > -1)
                {
                    info = ad;
                }
            }
            if (info == null)
            {
                audioDevice = new AudioCaptureDevice();
            }
            else
            {
                audioDevice = new AudioCaptureDevice(info);
            }

            audioDevice.NewFrame += AudioDevice_NewFrame;
            audioDevice.Format = SampleFormat.Format16Bit;



            FileWriter = new VideoFileWriter();
            FileWriter.Open(@"d:\nn.mp4",x,y,10,VideoCodec.MPEG4  ,1000000,AudioCodec.MP3  ,320000,audioDevice.SampleRate ,audioDevice.Channels  );

            recorderTherad = new Thread(delegate () { recorder(); });
            start = true;
            audioDevice.Start();
            recorderTherad.Start();
        }

        private void recorder()
        {
            stopwatch.Start();
            while (start == true)
            {
             Bitmap bitmap = new Bitmap(x, y);
                using (Graphics g = Graphics.FromImage(bitmap))
                { g.CopyFromScreen(new System.Drawing.Point(0, 0), System.Drawing.Point.Empty, new Size(x, y)); }

                stopwatch.Stop();
                frameTime = Convert.ToInt32(stopwatch.ElapsedMilliseconds);
                stopwatch.Restart();

                //if time of get screen shoot > 100 msec
                if (frameTime > 100)
                {
                    totalTime += frameTime;
                    TimeSpan d = new TimeSpan(0, 0, 0, 0, totalTime);
                    FileWriter.WriteVideoFrame(bitmap, d);
                    bitmap.Dispose();
                }
                else
                {
                    totalTime += 100;
                    TimeSpan d = new TimeSpan(0, 0, 0, 0, totalTime);
                    FileWriter.WriteVideoFrame(bitmap, d);
                    bitmap.Dispose();
                    Thread.Sleep(100 - frameTime);
                }
            }
        }
        private void AudioDevice_NewFrame(object sender, Accord.Audio.NewFrameEventArgs e)
        {
                FileWriter.WriteAudioFrame(e.Signal.RawData);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            audioDevice .Stop();
            start = false;
            recorderTherad.Abort();
            FileWriter.Close();
            FileWriter.Dispose();
            audioDevice.Dispose();
        }
    }
}


  


• Subtitles in ffmpeg/libavfilter

  15 juin 2021, par Captain Jack

  I have a C program to read video/audio with libav/ffmpeg libraries and decode it.

  



  I am playing with some filters and most work just fine. I can draw text, overlay logos, flip and invert video colours. However, I am having big issues overlaying subtitles.

  



  My filter is very simple.

  



  const char *vfilter_descr = "[in]subtitles=subs.srt[out]";


  



  On the console I get this :

  



  [Parsed_subtitles_0 @ 0x7fe76c703240] Shaper: FriBidi 0.19.7 (SIMPLE) HarfBuzz-ng 2.4.0 (COMPLEX)
[Parsed_subtitles_0 @ 0x7fe76c703240] Using font provider coretext
[Parsed_subtitles_0 @ 0x7fe76c703240] fontselect: (Arial, 400, 0) -> /Library/Fonts/Microsoft/Arial.ttf, -1, ArialMT
[Parsed_subtitles_0 @ 0x7fe76c703240] fontselect: (Arial, 400, 100) -> /Library/Fonts/Microsoft/Arial Italic.ttf, -1, Arial-ItalicMT


  



  ...which somewhat confirms that subtitles are loading, though I am not sure why there are two fonts being loaded ?

  



  However, they are not showing at all - almost as if they never loaded. I tried several different files, including ASS ones but no luck.

  



  ffmpeg version is the latest one.

  



  $ ffmpeg -v
ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
  built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3_1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100


  



  Any ideas ?