public string Join(params string[] inputs)
{
var tempVideos = AdjustResolutions(inputs);
var outputVideo = FilesUtils.GetMediaFile("{0}.mp4", Guid.NewGuid());
var files = "";
var filters = "-filter_complex \"";
for (var i = 0; i < tempVideos.Count; i++)
{
files += $"-i {tempVideos[i]} ";
filters += $"[{i}:v:0][{i}:a:0]";
}
var parameters = files + filters + $"concat=n={tempVideos.Count}:v=1:a=1[outv][outa]\" " +
$"-map \"[outv]\" -map \"[outa]\" -y {outputVideo}";
using (var process = ConfigureProcess(FfmpegPath, parameters))
{
process.Start();
process.WaitForExit();
}
FilesUtils.CleanTempFiles(tempVideos);
return(outputVideo);
}
public string GetFrame(string inputVideo, int timeInSeconds)
{
var inputVideoName = Path.GetFileNameWithoutExtension(inputVideo);
var outputFrame = FilesUtils.GetMediaFile("{0}_{1}_sec.jpeg", inputVideoName, timeInSeconds);
var parameters = $"-ss {timeInSeconds} -i {inputVideo} -frames:v 1 -y {outputFrame}";
using (var process = ConfigureProcess(FfmpegPath, parameters))
{
process.Start();
process.WaitForExit();
}
return(outputFrame);
}
public string Convert(string inputVideo, VideoConversionOptions options)
{
var outputFile = FilesUtils.GetMediaFile(
"{0}_{1}.{2}",
Path.GetFileNameWithoutExtension(inputVideo),
Guid.NewGuid(),
options.Format.ToString().ToLower());
var parameters = $"-i {inputVideo} ";
if (VideoCodecs.ContainsKey(options.Format))
{
parameters += $"-vcodec {VideoCodecs[options.Format]} ";
}
if (options.Width != 0 && options.Height != 0)
{
parameters += $"-s {options.Width}x{options.Height} ";
}
if (options.HorizontalAspect != 0 && options.VerticalAspect != 0)
{
parameters += $"-aspect {options.Width}:{options.Height} ";
}
if (options.Bitrate > 0)
{
parameters += $"-b:v {options.Bitrate}k ";
}
if (AudioCodecs.ContainsKey(options.Format))
{
parameters += $"-acodec {AudioCodecs[options.Format]} -b:a 64k ";
}
parameters += $"-y {outputFile}";
using (var process = ConfigureProcess(FfmpegPath, parameters))
{
process.Start();
process.WaitForExit();
}
return(outputFile);
}
private static IList <string> AdjustResolutions(string[] inputs)
{
var maxHeight = 0;
var maxWidth = 0;
var resolutions = new Dictionary <string, int[]>();
foreach (var input in inputs)
{
var parameters = "-v error -select_streams v:0 -show_entries " +
$"stream=width,height -of csv=s=x:p=0 {input}";
using (var process = ConfigureProcess(FfprobePath, parameters))
{
process.Start();
process.WaitForExit();
var line = process.StandardOutput.ReadLine();
if (line != null)
{
var args = line.Split('x').Select(int.Parse).ToArray();
resolutions[input] = args;
maxWidth = Math.Max(maxWidth, args[0]);
maxHeight = Math.Max(maxHeight, args[1]);
}
}
}
var tempVideos = new List <string>();
foreach (var input in inputs)
{
var tempVideo = $"{Path.GetFileNameWithoutExtension(input)}_{Guid.NewGuid()}{Path.GetExtension(input)}";
tempVideo = FilesUtils.GetTempFile(tempVideo);
// Upscale video if it is too small.
if (resolutions[input][0] != maxWidth || resolutions[input][1] != maxHeight)
{
var parameters = $"-i {input} -vf " +
$"\"scale=w={maxWidth}:h={maxHeight}:force_original_aspect_ratio=1," +
$"pad={maxWidth}:{maxHeight}:(ow-iw)/2:(oh-ih)/2\" " +
$"{tempVideo}";
using (var process = ConfigureProcess(FfmpegPath, parameters))
{
process.Start();
process.WaitForExit();
}
}
else
{
File.Copy(input, tempVideo);
}
tempVideos.Add(tempVideo);
}
return(tempVideos);
}
