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Snapshot improvements

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completely in-memory is now possible
This commit is contained in:
Malte Rosenbjerg 2020-05-12 22:48:20 +02:00
parent 59f2afd2ca
commit ca89cac2f0
2 changed files with 61 additions and 42 deletions
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10
FFMpegCore.Test/VideoTest.cs
View file

@ -3,6 +3,7 @@
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
@ -427,7 +428,7 @@ public void Video_ToOGV_MultiThread()
}
[TestMethod]
public void Video_Snapshot()
public void Video_Snapshot_InMemory()
{
var output = Input.OutputLocation(ImageType.Png);
@ -435,7 +436,7 @@ public void Video_Snapshot()
{
var input = FFProbe.Analyse(Input.FullName);
using var bitmap = FFMpeg.Snapshot(input, output);
using var bitmap = FFMpeg.Snapshot(input);
Assert.AreEqual(input.PrimaryVideoStream.Width, bitmap.Width);
Assert.AreEqual(input.PrimaryVideoStream.Height, bitmap.Height);
Assert.AreEqual(bitmap.RawFormat, ImageFormat.Png);
@ -455,11 +456,12 @@ public void Video_Snapshot_PersistSnapshot()
{
var input = FFProbe.Analyse(Input.FullName);
using var bitmap = FFMpeg.Snapshot(input, output, persistSnapshotOnFileSystem: true);
FFMpeg.Snapshot(input, output);
var bitmap = Image.FromFile(output);
Assert.AreEqual(input.PrimaryVideoStream.Width, bitmap.Width);
Assert.AreEqual(input.PrimaryVideoStream.Height, bitmap.Height);
Assert.AreEqual(bitmap.RawFormat, ImageFormat.Png);
Assert.IsTrue(File.Exists(output));
}
finally
{

89
FFMpegCore/FFMpeg/FFMpeg.cs
View file

@ -7,29 +7,68 @@
using FFMpegCore.Enums;
using FFMpegCore.Exceptions;
using FFMpegCore.Helpers;
using FFMpegCore.Pipes;
namespace FFMpegCore
{
public static class FFMpeg
{
/// <summary>
/// Saves a 'png' thumbnail from the input video.
/// Saves a 'png' thumbnail from the input video to drive
/// </summary>
/// <param name="source">Source video file.</param>
/// <param name="output">Output video file</param>
/// <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>
/// <param name="persistSnapshotOnFileSystem">By default, it deletes the created image on disk. If set to true, it won't delete the image</param>
/// <returns>Bitmap with the requested snapshot.</returns>
public static Bitmap Snapshot(MediaAnalysis source, string output, Size? size = null, TimeSpan? captureTime = null,
bool persistSnapshotOnFileSystem = false)
public static bool Snapshot(MediaAnalysis source, string output, Size? size = null, TimeSpan? captureTime = null)
{
if (captureTime == null)
captureTime = TimeSpan.FromSeconds(source.Duration.TotalSeconds / 3);
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>
/// 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 StreamPipeDataReader(ms))
.ProcessSynchronously();
ms.Position = 0;
return new Bitmap(ms);
}
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);
@ -39,42 +78,20 @@ public static Bitmap Snapshot(MediaAnalysis source, string output, Size? size =
{
var ratio = source.PrimaryVideoStream.Width / (double) size.Value.Width;
size = new Size((int)(source.PrimaryVideoStream.Width * ratio), (int)(source.PrimaryVideoStream.Height * ratio));
size = new Size((int) (source.PrimaryVideoStream.Width * ratio),
(int) (source.PrimaryVideoStream.Height * ratio));
}
if (size.Value.Height == 0)
{
var ratio = source.PrimaryVideoStream.Height / (double) size.Value.Height;
size = new Size((int)(source.PrimaryVideoStream.Width * ratio), (int)(source.PrimaryVideoStream.Height * ratio));
size = new Size((int) (source.PrimaryVideoStream.Width * ratio),
(int) (source.PrimaryVideoStream.Height * ratio));
}
}
var success = FFMpegArguments
.FromInputFiles(true, source.Path)
.WithVideoCodec(VideoCodec.Png)
.WithFrameOutputCount(1)
.Resize(size)
.Seek(captureTime)
.OutputToFile(output)
.ProcessSynchronously();
if (!success)
throw new OperationCanceledException("Could not take snapshot!");
Bitmap result;
using (var bmp = (Bitmap)Image.FromFile(output))
{
using var ms = new MemoryStream();
bmp.Save(ms, ImageFormat.Png);
result = new Bitmap(ms);
}
if (File.Exists(output) && !persistSnapshotOnFileSystem)
File.Delete(output);
return result;
return size;
}
/// <summary>
@ -489,7 +506,7 @@ public static bool TryGetContainerFormat(string name, out ContainerFormat fmt)
return FFMpegCache.ContainerFormats.TryGetValue(name, out fmt);
}
public static ContainerFormat GetContinerFormat(string name)
public static ContainerFormat GetContainerFormat(string name)
{
if (TryGetContainerFormat(name, out var fmt))
return fmt;