private string getErrorMessage(int errorCode)
{
const ulong buffer_size = 256;
byte[] buffer = new byte[buffer_size];
int strErrorCode;
fixed(byte *bufPtr = buffer)
{
strErrorCode = ffmpeg.av_strerror(errorCode, bufPtr, buffer_size);
}
if (strErrorCode < 0)
{
return($"{errorCode} (av_strerror failed with code {strErrorCode})");
}
var messageLength = Math.Max(0, Array.IndexOf(buffer, (byte)0));
return(Encoding.ASCII.GetString(buffer[..messageLength]));