Converting Frame to byte[]

[MastalerzKamil]

What I need to do is getting frame and convert that to byte[] format to send it to another microservice. Is that conversion possible? I know that there is property Span<byte> and then use ToArray() but it didn't work and RestSharp throw an exception.

[Toumash]

What code is exactly throwing an exception? Show us the stack trace with the message. Isn't that a serialization issue - from the serialization library that RestSharp uses? How big is the frame in kilobytes?

[MastalerzKamil]

Alright, my problem has been solved. @Toumash was right, RestSharp might be problematic. The more simple way was using HttpClient.

Here is a method which do that:

private async void SendPicture(string frameName, byte[] frameData)
{
    var client = new HttpClient();
    var formDataContent = new MultipartFormDataContent();
    var fileContent = new ByteArrayContent(frameData);
    fileContent.Headers.ContentType = new MediaTypeHeaderValue("image/png");
    var fileName = $"{frameName}.png";
    formDataContent.Add(fileContent, "image", fileName);

    var namePair = new KeyValuePair<string, string>("name", frameName);
    formDataContent.Add(new StringContent(namePair.Value), namePair.Key);

    var response = await client.PostAsync("http://127.0.0.1:5002/predict", formDataContent);

}

The issue has been also connected with sending pixels instead of bytes array converted to PNG format. I've converted Image<Bgr24> into bytes[] of PNG image by using SixLabors library.

var framePixels = file.Video.ReadFrame(i).ToBitmap();
var ms = new MemoryStream();
framePixels.SaveAsPng(ms);
var frameAsPng = ms.ToArray();