private static unsafe void DecodeAllFramesToImages(AVHWDeviceType HWDevice)
{
// decode all frames from url, please not it might local resorce, e.g. string url = "../../sample_mpeg4.mp4";
//var url = "http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"; // be advised this file holds 1440 frames
var url = "test.mp4";
using (var vsd = new VideoStreamDecoder(url, HWDevice))
{
Console.WriteLine($"codec name: {vsd.CodecName}");
var info = vsd.GetContextInfo();
info.ToList().ForEach(x => Console.WriteLine($"{x.Key} = {x.Value}"));
var sourceSize = vsd.FrameSize;
var sourcePixelFormat = HWDevice == AVHWDeviceType.AV_HWDEVICE_TYPE_NONE ? vsd.PixelFormat : GetHWPixelFormat(HWDevice);
var destinationSize = sourceSize;
var destinationPixelFormat = AVPixelFormat.AV_PIX_FMT_BGR24;
using (var vfc = new VideoFrameConverter(sourceSize, sourcePixelFormat, destinationSize, destinationPixelFormat))
{
var frameNumber = 0;
while (vsd.TryDecodeNextFrame(out var frame))
{
var convertedFrame = vfc.Convert(frame);
using (var bitmap = new Bitmap(convertedFrame.width, convertedFrame.height, convertedFrame.linesize[0], PixelFormat.Format24bppRgb, (IntPtr)convertedFrame.data[0]))
bitmap.Save($"frame.{frameNumber:D8}.jpg", ImageFormat.Jpeg);
Console.WriteLine($"frame: {frameNumber}");
frameNumber++;
}
}
}
}
private static unsafe void EncodeImagesToH264()
{
var frameFiles = Directory.GetFiles(".", "frame.*.jpg").OrderBy(x => x).ToArray();
var fistFrameImage = Image.FromFile(frameFiles.First());
var outputFileName = "out.h264";
var fps = 25;
var sourceSize = fistFrameImage.Size;
var sourcePixelFormat = AVPixelFormat.AV_PIX_FMT_BGR24;
var destinationSize = sourceSize;
var destinationPixelFormat = AVPixelFormat.AV_PIX_FMT_YUV420P;
using (var vfc = new VideoFrameConverter(sourceSize, sourcePixelFormat, destinationSize, destinationPixelFormat))
{
using (var fs = File.Open(outputFileName, FileMode.Create)) // be advise only ffmpeg based player (like ffplay or vlc) can play this file, for the others you need to go through muxing
{
using (var vse = new H264VideoStreamEncoder(fs, fps, destinationSize))
{
var frameNumber = 0;
foreach (var frameFile in frameFiles)
{
byte[] bitmapData;
using (var frameImage = Image.FromFile(frameFile))
using (var frameBitmap = frameImage is Bitmap bitmap ? bitmap : new Bitmap(frameImage))
{
bitmapData = GetBitmapData(frameBitmap);
}
fixed(byte *pBitmapData = bitmapData)
{
var data = new byte_ptrArray8 {
[0] = pBitmapData
};
var linesize = new int_array8 {
[0] = bitmapData.Length / sourceSize.Height
};
var frame = new AVFrame
{
data = data,
linesize = linesize,
height = sourceSize.Height
};
var convertedFrame = vfc.Convert(frame);
convertedFrame.pts = frameNumber * fps;
vse.Encode(convertedFrame);
}
Console.WriteLine($"frame: {frameNumber}");
frameNumber++;
}
}
}
}
}