How to get better video quality using Accord.Video.FFMPEG.DLL

Question

I have developed a Visual Studio Winapp that produces a video file utilizing Accord.Video.FFMPEG.DLL.

The quality the video is less than the original images. Here is the code and then a sample original image and snapshot of the resulting video.

What can I change to improve the video image?

            VideoFileWriter writer = new VideoFileWriter();
            writer.Open(outfile, width, height, 1, VideoCodec.Mpeg4);
            for (int i = firstrow; i <= testframes; i++)
            {
                Bitmap bitmap = new Bitmap(ffiles[i, 0].ToString());
                writer.WriteVideoFrame(bitmap);
                bitmap.Dispose();
            }

I tried Bitmap image = new Bitmap(width, height, PixelFormat.Format64bppArgb);

Answer 1

I tried multiple configurations, and it looks like using VP9 codec and WebM file gives the best quality.
We may also set the bitRate argument to high value.

Code sample:

using Accord.Video.FFMPEG;
using Accord.Math;
using System.Drawing;

namespace Testings
{
    public class Program
    {
        static void Main(string[] args)
        {
            Bitmap tmp_bitmap = new Bitmap(@"Image640x480.png");
            int width = tmp_bitmap.Width; //640
            int height = tmp_bitmap.Height; //480
            tmp_bitmap.Dispose();

            VideoFileWriter writer = new VideoFileWriter();
            //writer.Open(@"outfile.mp4", width, height, new Rational(1, 1), VideoCodec.H264);
            writer.Open(@"outfile.webm", width, height, new Rational(1, 1), VideoCodec.VP9, 50000000);
            for (int i = 0; i < 10; i++)
            {
                Bitmap bitmap = new Bitmap(@"Image640x480.png");  //For the example, I used the same image.
                writer.WriteVideoFrame(bitmap);
                bitmap.Dispose();
            }

            writer.Close();
        }
    }
}

---

Note:
The output colors doesn't seem accurate, and there are multiple options that doesn't work.
Instead of using Accord, I recommend using FFmpeg CLI, or looking for a better package.

Answer 2

Use videocodec.H264 in the open function it will give better output.