Image sequence to video stream?

问题

Like many people already seem to have (there are several threads on this subject here) I am looking for ways to create video from a sequence of images.

I want to implement my functionality in C#!

Here is what I wan't to do:

/*Pseudo code*/
void CreateVideo(List<Image> imageSequence, long durationOfEachImageMs, string outputVideoFileName, string outputFormat)
{
    // Info: imageSequence.Count will be > 30 000 images
    // Info: durationOfEachImageMs will be < 300 ms

    if (outputFormat = "mpeg")
    {
    }
    else if (outputFormat = "avi")
    {      
    }
    else
    {
    }

    //Save video file do disk
}

I know there's a project called Splicer (http://splicer.codeplex.com/) but I can't find suitable documentation or clear examples that I can follow (these are the examples that I found).

The closest I want to do, which I find here on CodePlex is this: How can I create a video from a directory of images in C#?

I have also read a few threads about ffmpeg (for example this: C# and FFmpeg preferably without shell commands? and this: convert image sequence using ffmpeg) but I find no one to help me with my problem and I don't think ffmpeg-command-line-style is the best solution for me (because of the amount of images).

I believe that I can use the Splicer-project in some way (?).

In my case, it is about about > 30 000 images where each image should be displayed for about 200 ms (in the videostream that I want to create).

(What the video is about? Plants growing ...)

Can anyone help me complete my function?

回答1:

Well, this answer comes a bit late, but since I have noticed some activity with my original question lately (and the fact that there was not provided a working solution) I would like to give you what finally worked for me.

I'll split my answer into three parts:

Background
Problem
Solution

Background

(this section is not important for the solution)

My original problem was that I had a lot of images (i.e. a huge amount), images that were individually stored in a database as byte arrays. I wanted to make a video sequence with all these images.

My equipment setup was something like this general drawing:

The images depicted growing tomato plants in different states. All images were taken every 1 minute under daytime.

/*pseudo code for taking and storing images*/
while (true)
{
    if (daylight)
    {
        //get an image from the camera
        //store the image as byte array to db
    }
    //wait 1 min
}

I had a very simple db for storing images, there were only one table (the table ImageSet) in it:

Problem

I had read many articles about ffmpeg (please see my original question) but I couldn't find any on how to go from a collection of images to a video.

Solution

Finally, I got a working solution! The main part of it comes from the open source project AForge.NET. In short, you could say that AForge.NET is a computer vision and artificial intelligence library in C#. (If you want a copy of the framework, just grab it from http://www.aforgenet.com/)

In AForge.NET, there is this VideoFileWriter class (a class for writing videofiles with help of ffmpeg). This did almost all of the work. (There is also a very good example here)

This is the final class (reduced) which I used to fetch and convert image data into a video from my image database:

public class MovieMaker
{

    public void Start()
    {
        var startDate = DateTime.Parse("12 Mar 2012");
        var endDate = DateTime.Parse("13 Aug 2012");

        CreateMovie(startDate, endDate);
    }    


    /*THIS CODE BLOCK IS COPIED*/

    public Bitmap ToBitmap(byte[] byteArrayIn)
    {
        var ms = new System.IO.MemoryStream(byteArrayIn);
        var returnImage = System.Drawing.Image.FromStream(ms);
        var bitmap = new System.Drawing.Bitmap(returnImage);

        return bitmap;
    }

    public Bitmap ReduceBitmap(Bitmap original, int reducedWidth, int reducedHeight)
    {
        var reduced = new Bitmap(reducedWidth, reducedHeight);
        using (var dc = Graphics.FromImage(reduced))
        {
            // you might want to change properties like
            dc.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            dc.DrawImage(original, new Rectangle(0, 0, reducedWidth, reducedHeight), new Rectangle(0, 0, original.Width, original.Height), GraphicsUnit.Pixel);
        }

        return reduced;
    }

    /*END OF COPIED CODE BLOCK*/


    private void CreateMovie(DateTime startDate, DateTime endDate)
    {
        int width = 320;
        int height = 240;
        var framRate = 200;

        using (var container = new ImageEntitiesContainer())
        {
            //a LINQ-query for getting the desired images
            var query = from d in container.ImageSet
                        where d.Date >= startDate && d.Date <= endDate
                        select d;

            // create instance of video writer
            using (var vFWriter = new VideoFileWriter())
            {
                // create new video file
                vFWriter.Open("nameOfMyVideoFile.avi", width, height, framRate, VideoCodec.Raw);

                var imageEntities = query.ToList();

                //loop throught all images in the collection
                foreach (var imageEntity in imageEntities)
                {
                    //what's the current image data?
                    var imageByteArray = imageEntity.Data;
                    var bmp = ToBitmap(imageByteArray);
                    var bmpReduced = ReduceBitmap(bmp, width, height);

                    vFWriter.WriteVideoFrame(bmpReduced);
                }
                vFWriter.Close();
            }
        }

    }
}

Update 2013-11-29 (how to) (Hope this is what you asked for @Kiquenet?)

Download AForge.NET Framework from the downloads page (Download full ZIP archive and you will find many interesting Visual Studio solutions with projects, like Video, in the AForge.NET Framework-2.2.5\Samples folder...)
Namespace: AForge.Video.FFMPEG (from the documentation)
Assembly: AForge.Video.FFMPEG (in AForge.Video.FFMPEG.dll) (from the documentation) (you can find this AForge.Video.FFMPEG.dll in the AForge.NET Framework-2.2.5\Release folder)

If you want to create your own solution, make sure you have a reference to AForge.Video.FFMPEG.dll in your project. Then it should be easy to use the VideoFileWriter class. If you follow the link to the class you will find a very good (and simple example). In the code, they are feeding the VideoFileWriter with Bitmap image in a for-loop

回答2:

I found this code in the slicer samples, looks pretty close to to what you want:

string outputFile = "FadeBetweenImages.wmv";
using (ITimeline timeline = new DefaultTimeline())
{
    IGroup group = timeline.AddVideoGroup(32, 160, 100);
    ITrack videoTrack = group.AddTrack();
    IClip clip1 = videoTrack.AddImage("image1.jpg", 0, 2); // play first image for a little while
    IClip clip2 = videoTrack.AddImage("image2.jpg", 0, 2); // and the next
    IClip clip3 = videoTrack.AddImage("image3.jpg", 0, 2); // and finally the last
    IClip clip4 = videoTrack.AddImage("image4.jpg", 0, 2); // and finally the last
}

  double halfDuration = 0.5;

  // fade out and back in
  group.AddTransition(clip2.Offset - halfDuration, halfDuration, StandardTransitions.CreateFade(), true);
  group.AddTransition(clip2.Offset, halfDuration, StandardTransitions.CreateFade(), false);

  // again
  group.AddTransition(clip3.Offset - halfDuration, halfDuration, StandardTransitions.CreateFade(), true);
  group.AddTransition(clip3.Offset, halfDuration, StandardTransitions.CreateFade(), false);

  // and again
  group.AddTransition(clip4.Offset - halfDuration, halfDuration, StandardTransitions.CreateFade(), true);
  group.AddTransition(clip4.Offset, halfDuration, StandardTransitions.CreateFade(), false);

  // add some audio
  ITrack audioTrack = timeline.AddAudioGroup().AddTrack();

  IClip audio =
     audioTrack.AddAudio("testinput.wav", 0, videoTrack.Duration);

  // create an audio envelope effect, this will:
  // fade the audio from 0% to 100% in 1 second.
  // play at full volume until 1 second before the end of the track
  // fade back out to 0% volume
  audioTrack.AddEffect(0, audio.Duration,
                 StandardEffects.CreateAudioEnvelope(1.0, 1.0, 1.0, audio.Duration));

  // render our slideshow out to a windows media file
  using (
     IRenderer renderer =
        new WindowsMediaRenderer(timeline, outputFile, WindowsMediaProfiles.HighQualityVideo))
  {
     renderer.Render();
  }
}

回答3:

I could not manage to get the above example to work. However I did find another library that works amazingly well once. Try via NuGet "accord.extensions.imaging.io", then I wrote the following little function:

    private void makeAvi(string imageInputfolderName, string outVideoFileName, float fps = 12.0f, string imgSearchPattern = "*.png")
    {   // reads all images in folder 
        VideoWriter w = new VideoWriter(outVideoFileName, 
            new Accord.Extensions.Size(480, 640), fps, true);
        Accord.Extensions.Imaging.ImageDirectoryReader ir = 
            new ImageDirectoryReader(imageInputfolderName, imgSearchPattern);
        while (ir.Position < ir.Length)
        {
            IImage i = ir.Read();
            w.Write(i);
        }
        w.Close();
    }

It reads all images from a folder and makes a video out of them.

If you want to make it nicer you could probably read the image dimensions instead of hard coding, but you got the point.

回答4:

This function is based on Splicer.Net library.Took me ages to understand how that library works. Make sure that your fps(frame per second )is correct. By the way standard 24 f/s.

In my case I have 15 images and I now that I need 7 seconds video-> so fps =2. Fps may vary according to platform...or developer usage.

public bool CreateVideo(List<Bitmap> bitmaps, string outputFile, double fps)
        {
            int width = 640;
            int height = 480;
            if (bitmaps == null || bitmaps.Count == 0) return false;
            try
            {
                using (ITimeline timeline = new DefaultTimeline(fps))
                {
                    IGroup group = timeline.AddVideoGroup(32, width, height);
                    ITrack videoTrack = group.AddTrack();

                    int i = 0;
                    double miniDuration = 1.0 / fps;
                    foreach (var bmp in bitmaps)
                    {
                        IClip clip = videoTrack.AddImage(bmp, 0, i * miniDuration, (i + 1) * miniDuration);
                        System.Diagnostics.Debug.WriteLine(++i);

                    }
                    timeline.AddAudioGroup();
                    IRenderer renderer = new WindowsMediaRenderer(timeline, outputFile, WindowsMediaProfiles.HighQualityVideo);
                    renderer.Render();
                }
            }
            catch { return false; }
            return true;
        }

Hope this helps.

回答5:

This is a solution for creating a video from an image sequence using Visual Studio using C#.

My starting point was "Hauns TM"'s answer below but my requirements were more basic than theirs so this solution might be more appropriated for less advanced users ( like myself )

Libraries:

using System;
using System.IO;
using System.Drawing;
using Accord.Video.FFMPEG;

You can get the FFMPEG libarary by searching for FFMPEG in "Tools -> NuGet Package Manager -> Manage NuGet Packages for a Solution..."

The variables that I passed into the function are:

outputFileName = "C://outputFolder//outputMovie.avi"
inputImageSequence = ["C://inputFolder//image_001.avi", "C://inputFolder//image_002.avi", "C://inputFolder//image_003.avi", "C://inputFolder//image_004.avi"]

Function:

private void videoMaker( string outputFileName , string[] inputImageSequence)
{
  int width = 1920;
  int height = 1080;
  var framRate = 25;

  using (var vFWriter = new VideoFileWriter())
  {
    // create new video file
    vFWriter.Open(outputFileName, width, height, framRate, VideoCodec.Raw);

    foreach (var imageLocation in inputImageSequence)
    {
      Bitmap imageFrame = System.Drawing.Image.FromFile(imageLocation) as Bitmap;
      vFWriter.WriteVideoFrame(imageFrame);
    }
    vFWriter.Close();
  }
}

来源：https://stackoverflow.com/questions/9744026/image-sequence-to-video-stream

标签

image

video

ffmpeg

aforge