private static Size?PrepareSnapshotSize(MediaAnalysis source, Size?wantedSize)
{
if (wantedSize == null || (wantedSize.Value.Height <= 0 && wantedSize.Value.Width <= 0))
{
return(null);
}
var currentSize = new Size(source.PrimaryVideoStream.Width, source.PrimaryVideoStream.Height);
if (source.PrimaryVideoStream.Rotation == 90 || source.PrimaryVideoStream.Rotation == 180)
{
currentSize = new Size(source.PrimaryVideoStream.Height, source.PrimaryVideoStream.Width);
}
if (wantedSize.Value.Width != currentSize.Width || wantedSize.Value.Height != currentSize.Height)
{
if (wantedSize.Value.Width <= 0 && wantedSize.Value.Height > 0)
{
var ratio = (double)wantedSize.Value.Height / currentSize.Height;
return(new Size((int)(currentSize.Width * ratio), (int)(currentSize.Height * ratio)));
}
if (wantedSize.Value.Height <= 0 && wantedSize.Value.Width > 0)
{
var ratio = (double)wantedSize.Value.Width / currentSize.Width;
return(new Size((int)(currentSize.Width * ratio), (int)(currentSize.Height * ratio)));
}
return(wantedSize);
}
return(null);
}
private static Size?PrepareSnapshotSize(MediaAnalysis source, Size?size)
{
if (size == null || (size.Value.Height == 0 && size.Value.Width == 0))
{
size = new Size(source.PrimaryVideoStream.Width, source.PrimaryVideoStream.Height);
}
if (size.Value.Width != size.Value.Height)
{
if (size.Value.Width == 0)
{
var ratio = (double)size.Value.Height / source.PrimaryVideoStream.Height;
size = new Size((int)(source.PrimaryVideoStream.Width * ratio),
(int)(source.PrimaryVideoStream.Height * ratio));
}
if (size.Value.Height == 0)
{
var ratio = (double)size.Value.Width / source.PrimaryVideoStream.Width;
size = new Size((int)(source.PrimaryVideoStream.Width * ratio),
(int)(source.PrimaryVideoStream.Height * ratio));
}
}
return(size);
}
private static FFMpegArguments BuildSnapshotArguments(MediaAnalysis source, Size?size = null, TimeSpan?captureTime = null)
{
captureTime ??= TimeSpan.FromSeconds(source.Duration.TotalSeconds / 3);
size = PrepareSnapshotSize(source, size);
return(FFMpegArguments
.FromSeekedFiles((source.Path, captureTime ?? TimeSpan.Zero))
.WithVideoCodec(VideoCodec.Png)
.WithFrameOutputCount(1)
.Resize(size));
}
/// <summary>
/// Saves a 'png' thumbnail from the input video to drive
/// </summary>
/// <param name="source">Source video analysis</param>
/// <param name="output">Output video file path</param>
/// <param name="captureTime">Seek position where the thumbnail should be taken.</param>
/// <param name="size">Thumbnail size. If width or height equal 0, the other will be computed automatically.</param>
/// <returns>Bitmap with the requested snapshot.</returns>
public static Task <bool> SnapshotAsync(MediaAnalysis source, string output, Size?size = null, TimeSpan?captureTime = null)
{
if (Path.GetExtension(output) != FileExtension.Png)
{
output = Path.GetFileNameWithoutExtension(output) + FileExtension.Png;
}
var arguments = BuildSnapshotArguments(source, size, captureTime);
return(arguments
.OutputToFile(output)
.ProcessAsynchronously());
}
/// <summary>
/// Saves a 'png' thumbnail to an in-memory bitmap
/// </summary>
/// <param name="source">Source video file.</param>
/// <param name="captureTime">Seek position where the thumbnail should be taken.</param>
/// <param name="size">Thumbnail size. If width or height equal 0, the other will be computed automatically.</param>
/// <returns>Bitmap with the requested snapshot.</returns>
public static async Task <Bitmap> SnapshotAsync(MediaAnalysis source, Size?size = null, TimeSpan?captureTime = null)
{
var arguments = BuildSnapshotArguments(source, size, captureTime);
using var ms = new MemoryStream();
await arguments
.ForceFormat("rawvideo")
.OutputToPipe(new StreamPipeSink(ms))
.ProcessAsynchronously();
ms.Position = 0;
return(new Bitmap(ms));
}
/// <summary>
/// Saves a 'png' thumbnail to an in-memory bitmap
/// </summary>
/// <param name="source">Source video file.</param>
/// <param name="captureTime">Seek position where the thumbnail should be taken.</param>
/// <param name="size">Thumbnail size. If width or height equal 0, the other will be computed automatically.</param>
/// <returns>Bitmap with the requested snapshot.</returns>
public static Bitmap Snapshot(MediaAnalysis source, Size?size = null, TimeSpan?captureTime = null)
{
captureTime ??= TimeSpan.FromSeconds(source.Duration.TotalSeconds / 3);
size = PrepareSnapshotSize(source, size);
using var ms = new MemoryStream();
FFMpegArguments
.FromInputFiles(source.Path)
.WithVideoCodec(VideoCodec.Png)
.WithFrameOutputCount(1)
.Resize(size)
.Seek(captureTime)
.ForceFormat("rawvideo")
.OutputToPipe(new StreamPipeSink(ms))
.ProcessSynchronously();
ms.Position = 0;
return(new Bitmap(ms));
}
/// <summary>
/// Saves a 'png' thumbnail from the input video to drive
/// </summary>
/// <param name="source">Source video analysis</param>
/// <param name="output">Output video file path</param>
/// <param name="captureTime">Seek position where the thumbnail should be taken.</param>
/// <param name="size">Thumbnail size. If width or height equal 0, the other will be computed automatically.</param>
/// <returns>Bitmap with the requested snapshot.</returns>
public static bool Snapshot(MediaAnalysis source, string output, Size?size = null, TimeSpan?captureTime = null)
{
captureTime ??= TimeSpan.FromSeconds(source.Duration.TotalSeconds / 3);
if (Path.GetExtension(output) != FileExtension.Png)
{
output = Path.GetFileNameWithoutExtension(output) + FileExtension.Png;
}
size = PrepareSnapshotSize(source, size);
return(FFMpegArguments
.FromInputFiles(source.Path)
.WithVideoCodec(VideoCodec.Png)
.WithFrameOutputCount(1)
.Resize(size)
.Seek(captureTime)
.OutputToFile(output)
.ProcessSynchronously());
}
/// <summary>
/// Convert a video do a different format.
/// </summary>
/// <param name="source">Input video source.</param>
/// <param name="output">Output information.</param>
/// <param name="type">Target conversion video type.</param>
/// <param name="speed">Conversion target speed/quality (faster speed = lower quality).</param>
/// <param name="size">Video size.</param>
/// <param name="audioQuality">Conversion target audio quality.</param>
/// <param name="multithreaded">Is encoding multithreaded.</param>
/// <returns>Output video information.</returns>
public static bool Convert(
MediaAnalysis source,
string output,
ContainerFormat format,
Speed speed = Speed.SuperFast,
VideoSize size = VideoSize.Original,
AudioQuality audioQuality = AudioQuality.Normal,
bool multithreaded = false)
{
FFMpegHelper.ExtensionExceptionCheck(output, format.Extension);
FFMpegHelper.ConversionSizeExceptionCheck(source);
var scale = VideoSize.Original == size ? 1 : (double)source.PrimaryVideoStream.Height / (int)size;
var outputSize = new Size((int)(source.PrimaryVideoStream.Width / scale), (int)(source.PrimaryVideoStream.Height / scale));
if (outputSize.Width % 2 != 0)
{
outputSize.Width += 1;
}
return(format.Name switch
{
"mp4" => FFMpegArguments
.FromInputFiles(true, source.Path)
.UsingMultithreading(multithreaded)
.WithVideoCodec(VideoCodec.LibX264)
.WithVideoBitrate(2400)
.Scale(outputSize)
.WithSpeedPreset(speed)
.WithAudioCodec(AudioCodec.Aac)
.WithAudioBitrate(audioQuality)
.OutputToFile(output)
.ProcessSynchronously(),
"ogv" => FFMpegArguments
.FromInputFiles(true, source.Path)
.UsingMultithreading(multithreaded)
.WithVideoCodec(VideoCodec.LibTheora)
.WithVideoBitrate(2400)
.Scale(outputSize)
.WithSpeedPreset(speed)
.WithAudioCodec(AudioCodec.LibVorbis)
.WithAudioBitrate(audioQuality)
.OutputToFile(output)
.ProcessSynchronously(),
"mpegts" => FFMpegArguments
.FromInputFiles(true, source.Path)
.CopyChannel()
.WithBitStreamFilter(Channel.Video, Filter.H264_Mp4ToAnnexB)
.ForceFormat(VideoType.Ts)
.OutputToFile(output)
.ProcessSynchronously(),
"webm" => FFMpegArguments
.FromInputFiles(true, source.Path)
.UsingMultithreading(multithreaded)
.WithVideoCodec(VideoCodec.LibVpx)
.WithVideoBitrate(2400)
.Scale(outputSize)
.WithSpeedPreset(speed)
.WithAudioCodec(AudioCodec.LibVorbis)
.WithAudioBitrate(audioQuality)
.OutputToFile(output)
.ProcessSynchronously(),
_ => throw new ArgumentOutOfRangeException(nameof(format))
});
