private byte[] RunFFmpeg(string input, FFmpegSettings settings)
{
byte[] data;
try {
var arguments = $" -hide_banner -loglevel panic -y -ss {settings.Seek.ToString(CultureInfo.InvariantCulture)} -i \"{input}\" -t 1 -f {settings.OutputFormat} -vframes 1 {settings.VideoFrameSize} \"-\"";
var processStartInfo =
new ProcessStartInfo(Utils.FfmpegPath, arguments)
{
WindowStyle = ProcessWindowStyle.Hidden,
CreateNoWindow = true,
UseShellExecute = false,
WorkingDirectory = Path.GetDirectoryName(Utils.FfmpegPath) ?? string.Empty,
RedirectStandardInput = true, //required to avoid ffmpeg printing to console
RedirectStandardOutput = true,
};
FFMpegProcess = Process.Start(processStartInfo);
if (FFMpegProcess == null)
{
Logger.Instance.Info(Properties.Resources.FFMpegProcessWasAborted);
throw new FFMpegException(-1, Properties.Resources.FFMpegProcessWasAborted);
}
using var ms = new MemoryStream();
//start reading here, otherwise the streams fill up and ffmpeg will block forever
var imgDataTask = FFMpegProcess.StandardOutput.BaseStream.CopyToAsync(ms);
if (!FFMpegProcess.HasExited)
{
//Wait for process to exit
var milliseconds = (int)ExecutionTimeout.TotalMilliseconds;
var numberOfRetries = 0;
while (!FFMpegProcess.WaitForExit(milliseconds) && numberOfRetries < MaximumRetries)
{
numberOfRetries++;
}
if (numberOfRetries == MaximumRetries)
{
//Give up
EnsureFFMpegProcessStopped();
Logger.Instance.Info(string.Format(Properties.Resources.FFMpegTimeoutFile, InputFile));
throw new FFMpegException(-2,
string.Format(Properties.Resources.FFMpegTimeoutFile, InputFile));
}
}
imgDataTask.Wait(ExecutionTimeout);
data = ms.ToArray();
FFMpegProcess?.Close();
}
catch (Exception e) {
Debug.WriteLine(e);
EnsureFFMpegProcessStopped();
throw;
}
return(data);
}
public byte[] GetVideoThumbnail(string inputFile, float frameTime, bool grayScale)
{
InputFile = inputFile;
var settings = new FFmpegSettings {
Seek = frameTime,
OutputFormat = grayScale ? "rawvideo -pix_fmt gray" : "mjpeg",
VideoFrameSize = grayScale ? "-s 16x16" : "-vf scale=100:-1",
};
return(RunFFmpeg(inputFile, settings));
}
internal byte[] RunFFmpeg(string input, FFmpegSettings settings)
{
byte[] data;
try {
var arguments = $" -hide_banner -loglevel panic -y -ss {settings.Seek.ToString(CultureInfo.InvariantCulture)} -i \"{input}\" -t 1 -f {settings.OutputFormat} -vframes 1 {settings.VideoFrameSize} \"-\"";
var processStartInfo =
new ProcessStartInfo(Utils.FfmpegPath, arguments)
{
WindowStyle = ProcessWindowStyle.Hidden,
CreateNoWindow = true,
UseShellExecute = false,
WorkingDirectory = Path.GetDirectoryName(Utils.FfmpegPath) ?? string.Empty,
RedirectStandardInput = true, //required to avoid ffmpeg printing to console
RedirectStandardOutput = true,
};
if (FFMpegProcess != null)
{
throw new InvalidOperationException(Properties.Resources.FFMpegProcessIsAlreadyStarted);
}
FFMpegProcess = Process.Start(processStartInfo);
if (FFMpegProcess == null)
{
Logger.Instance.Info(Properties.Resources.FFMpegProcessWasAborted);
throw new FFMpegException(-1, Properties.Resources.FFMpegProcessWasAborted);
}
var ms = new MemoryStream();
//start reading here, otherwise the streams fill up and ffmpeg will block forever
var imgDataTask = FFMpegProcess.StandardOutput.BaseStream.CopyToAsync(ms);
WaitFFMpegProcessForExit();
imgDataTask.Wait(1000);
data = ms.ToArray();
FFMpegProcess?.Close();
}
catch (Exception) {
EnsureFFMpegProcessStopped();
throw;
}
return(data);
}