/// <summary>
/// Yuv420P sample
/// </summary>
/// <param name="outputFile">output file</param>
/// <param name="width">video width</param>
/// <param name="height">video height</param>
/// <param name="fps">video fps</param>
public FillYuv420PSample(string outputFile, int width, int height, int fps)
{
var dir = Directory.CreateDirectory(Path.Combine(Path.GetDirectoryName(outputFile), Path.GetFileNameWithoutExtension(outputFile))).FullName;
using (MediaWriter writer = new MediaWriter(outputFile))
{
writer.AddStream(MediaEncoder.CreateVideoEncode(writer.Format, width, height, fps));
writer.Initialize();
VideoFrame srcframe = new VideoFrame(width, height, FFmpeg.AutoGen.AVPixelFormat.AV_PIX_FMT_YUV420P);
PixelConverter pixelConverter = new PixelConverter(writer[0].Codec);
Random random = new Random();
for (int i = 0; i < fps * 10; i++)
{
// fill video frame
FillYuv420P(srcframe, i);
foreach (var dstframe in pixelConverter.Convert(srcframe))
{
dstframe.Pts = i;
SaveFrame(dstframe, Path.Combine(dir, $"{i}.bmp"));
foreach (var packet in writer[0].WriteFrame(dstframe))
{
writer.WritePacket(packet);
}
}
}
// flush cache
writer.FlushMuxer();
}
}
public Mp4VideoWriter AddVideo(int width, int height, int fps)
{
if (writer.Where(_ => _.Codec.Type == AVMediaType.AVMEDIA_TYPE_VIDEO).Count() == 0)
{
Height = height;
Width = width;
FPS = fps;
var st = writer.AddStream(MediaEncoder.CreateVideoEncode(writer.Format, width, height, fps));
videoIndex = writer.Count() - 1;
pixelConverter = new PixelConverter(st.Codec);
}
return(this);
}
/// <summary>
/// create a 60 / <paramref name="fps"/> second video
/// </summary>
/// <param name="outputFile">video output</param>
/// <param name="width">video width</param>
/// <param name="height">video height</param>
/// <param name="fps">video fps</param>
public EncodeVideoByMat(string outputFile, int width, int height, int fps)
{
using (MediaWriter writer = new MediaWriter(outputFile))
{
writer.AddStream(MediaEncoder.CreateVideoEncode(writer.Format, width, height, fps));
writer.Initialize();
VideoFrame dstframe = VideoFrame.CreateFrameByCodec(writer[0].Codec);
Random random = new Random();
for (int i = 0; i < 61; i++)
{
// create a video frame by Mat
byte b = (byte)random.Next(0, 255);
byte g = (byte)random.Next(0, 255);
byte r = (byte)random.Next(0, 255);
using (Image <Bgr, byte> image = new Image <Bgr, byte>(width, height, new Bgr(b, g, r)))
{
string line1 = $"pts = {i}, color = [{b,3},{g,3},{r,3}]";
string line2 = $"time = {DateTime.Now:HH:mm:ss.fff}";
image.Draw(line1, new System.Drawing.Point(30, 50), Emgu.CV.CvEnum.FontFace.HersheyDuplex, 1, new Bgr(255 - b, 255 - g, 255 - r));
image.Draw(line2, new System.Drawing.Point(30, 100), Emgu.CV.CvEnum.FontFace.HersheyDuplex, 1, new Bgr(255 - b, 255 - g, 255 - r));
dstframe = image.Mat.ToVideoFrame(AVPixelFormat.AV_PIX_FMT_YUV420P);
}
dstframe.Pts = i; // video pts = seconds from video start * fps (pts can only increase).
// write video frame, many cases: one frame more out packet, first frame no out packet, etc.
// so use IEnumerable.
foreach (var packet in writer[0].WriteFrame(dstframe))
{
writer.WritePacket(packet);
}
}
// flush cache
writer.FlushMuxer();
}
}
