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Image does not display in gallery after download

I am developing a Xamarin app which retrives info from DB, take/choose photo and upload them to remote server, display this images from the remote server and the user can delete them by tap on and press a button and download the images from the remote server to the local device.
Everything works without problem, but when I download the image and after I go to the gallery for check it, the image does not appear, whereas I can see it and open in the file explorer. When I reboot the phone, the image appear in the gallery.
Below my current button download method:
private void button_download_image_Clicked(object sender, EventArgs e)
{
Uri image_url_format = new Uri(image_url);
WebClient webClient = new WebClient();
try
{
byte[] bytes_image = webClient.DownloadData(image_url_format);
Stream image_stream = new MemoryStream(bytes_image);
string dest_folder = Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryDownloads).ToString();
string file_name = System.IO.Path.GetFileName(image_url_format.LocalPath);
string dest_path = System.IO.Path.Combine(dest_folder, file_name);
using (var fileStream = new FileStream(dest_path, FileMode.Create, FileAccess.Write))
{
image_stream.CopyTo(fileStream);
}
}
catch (Exception ex)
{
DisplayAlert("Error", ex.ToString(), "OK");
}
DisplayAlert("Alert", "Download completed!", "OK");
}
I tried in another device, but I got the same behavior.
Probably there is a sort of thing which does not refresh the gallery.
Any idea how to force the gallery to refresh or something similar?

You need to refresh your gallery after inserting or deleting any pictures in storage.
You can try this.
var mediaScanIntent = new Intent(Intent.ActionMediaScannerScanFile);
mediaScanIntent.SetData(Android.Net.Uri.FromFile(new Java.IO.File(dest_path)));
Xamarin.Forms.Forms.Context.SendBroadcast(mediaScanIntent);
Add these lines below your code.
Make it like
private void button_download_image_Clicked(object sender, EventArgs e)
{
Uri image_url_format = new Uri(image_url);
WebClient webClient = new WebClient();
try
{
byte[] bytes_image = webClient.DownloadData(image_url_format);
Stream image_stream = new MemoryStream(bytes_image);
string dest_folder = Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryDownloads).ToString();
string file_name = System.IO.Path.GetFileName(image_url_format.LocalPath);
string dest_path = System.IO.Path.Combine(dest_folder, file_name);
using (var fileStream = new FileStream(dest_path, FileMode.Create, FileAccess.Write))
{
image_stream.CopyTo(fileStream);
}
var mediaScanIntent = new Intent(Intent.ActionMediaScannerScanFile);
mediaScanIntent.SetData(Android.Net.Uri.FromFile(new Java.IO.File(dest_path)));
//for old xamarin forms version
Xamarin.Forms.Forms.Context.SendBroadcast(mediaScanIntent);
//for new xamarin forms version
//Android.App.Application.SendBroadcast(mediaScanIntent);
}
catch (Exception ex)
{
DisplayAlert("Error", ex.ToString(), "OK");
return;
}
DisplayAlert("Alert", "Download completed!", "OK");
}

You need to just refresh the file you have downloaded. It's helpful.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT){
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
File f = new File("file://"+ Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES));
Uri contentUri = Uri.fromFile(f);
mediaScanIntent.setData(contentUri);
this.sendBroadcast(mediaScanIntent);
}else{
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + Environment.getExternalStorageDirectory())));
}

Make sure required permission given on both platforms.
Use in your class:
bool success = await DependencyService.Get<IPhotoLibrary>().SavePhotoAsync(data, folder, filename);
Common Interface
public interface IPhotoLibrary
{
Task<bool> SavePhotoAsync(byte[] data, string folder, string filename);
}
In Android service
public async Task<bool> SavePhotoAsync(byte[] data, string folder, string filename)
{
try
{
File picturesDirectory = Environment.GetExternalStoragePublicDirectory(Environment.DirectoryPictures);
File folderDirectory = picturesDirectory;
if (!string.IsNullOrEmpty(folder))
{
folderDirectory = new File(picturesDirectory, folder);
folderDirectory.Mkdirs();
}
using (File bitmapFile = new File(folderDirectory, filename))
{
bitmapFile.CreateNewFile();
using (FileOutputStream outputStream = new FileOutputStream(bitmapFile))
{
await outputStream.WriteAsync(data);
}
// Make sure it shows up in the Photos gallery promptly.
MediaScannerConnection.ScanFile(MainActivity.Instance,
new string[] { bitmapFile.Path },
new string[] { "image/png", "image/jpeg" }, null);
}
}
catch (System.Exception ex)
{
return false;
}
return true;
}
In iOS service:
public Task<bool> SavePhotoAsync(byte[] data, string folder, string filename)
{
NSData nsData = NSData.FromArray(data);
UIImage image = new UIImage(nsData);
TaskCompletionSource<bool> taskCompletionSource = new TaskCompletionSource<bool>();
image.SaveToPhotosAlbum((UIImage img, NSError error) =>
{
taskCompletionSource.SetResult(error == null);
});
return taskCompletionSource.Task;
}
also you can refer this one just to save an image and to reflect it in media, no need to use skiasharp for that. https://learn.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/graphics/skiasharp/bitmaps/saving
Hope this may resolve your issue.

Refer to Blu's answer,
I changed this Xamarin.Forms.Forms.Context.SendBroadcast(mediaScanIntent); to Android.App.Application.Context.SendBroadcast(mediaScanIntent); and all works.

What is the best place to declare the connection of my socket and my spot in the background?

I develop an HMI under the UWP, it needs a connection to a server and a background task to monitor whether messages are received.
At the launch of the HMI, an extended splash screen is appearing with a progress ring. To unblock the startup, you have to receive "launch_ok " from the server then we have access to the main page which allows to manage calls.
Currently I declare everything in my file: ExtendedSplash.xaml.cs
I declare my new socket with these settings, I run it and then I run my background activity.
I have also some errors : "Exception levée : 'System.NullReferenceException'"
ExtendedSplash.xaml.cs (Extract):
namespace PhoneCenter
{
partial class ExtendedSplash : Page
{
// SOCKET CONFIGURATION
private const string socketId = "SampleSocket";
private StreamSocket socket = null;
private IBackgroundTaskRegistration task = null;
private const string port = "40404";
private const string adress = "172.16.161.80";
}
public ExtendedSplash(SplashScreen splashscreen, bool loadState)
{
InitializeComponent();
Window.Current.SizeChanged += new WindowSizeChangedEventHandler(ExtendedSplash_OnResize);
splash = splashscreen;
Debug.WriteLine("Création de la tâche d'arrière plan");
StartBackgroundTask();
Debug.WriteLine("Connexion Socket ...");
StartConnexionServeurLTO();
if (splash != null)
{
splash.Dismissed += new TypedEventHandler<SplashScreen, object>(DismissedEventHandler);
splashImageRect = splash.ImageLocation;
PositionImage();
PositionRing();
PositionTextBlock();
}
rootFrame = new Frame();
RestoreState(loadState);
}
// CONNEXION SOCKET
private async void StartConnexionServeurLTO()
{
ApplicationData.Current.LocalSettings.Values["hostname"] = adress;
ApplicationData.Current.LocalSettings.Values["port"] = port;
try
{
SocketActivityInformation socketInformation;
if (!SocketActivityInformation.AllSockets.TryGetValue(socketId, out socketInformation))
{
Debug.WriteLine("Boucle");
socket = new StreamSocket();
socket.EnableTransferOwnership(task.TaskId, SocketActivityConnectedStandbyAction.Wake);
var targetServer = new HostName(adress);
await socket.ConnectAsync(targetServer, port);
DataReader reader = new DataReader(socket.InputStream);
reader.InputStreamOptions = InputStreamOptions.Partial;
var read = reader.LoadAsync(250);
read.Completed += (info, status) =>
{
};
await socket.CancelIOAsync();
socket.TransferOwnership(socketId);
socket = null;
}
}
catch
{
Debug.WriteLine("Echec dans la connexion au serveur");
}
}
// LANCEMENT TÂCHE EN ARRIERE PLAN
private void StartBackgroundTask()
{
try
{
foreach (var current in BackgroundTaskRegistration.AllTasks)
{
if (current.Value.Name == "PhonieMarthaBackground")
{
task = current.Value;
break;
}
}
if (task == null)
{
var socketTaskBuilder = new BackgroundTaskBuilder();
socketTaskBuilder.Name = "PhonieMarthaBackground";
socketTaskBuilder.TaskEntryPoint = "PhonieMarthaBackground.SocketActivityTask";
var trigger = new SocketActivityTrigger();
socketTaskBuilder.SetTrigger(trigger);
task = socketTaskBuilder.Register();
}
SocketActivityInformation socketInformation;
if (SocketActivityInformation.AllSockets.TryGetValue(socketId, out socketInformation))
{
socket = socketInformation.StreamSocket;
socket.TransferOwnership(socketId);
socket = null;
}
Debug.WriteLine("Tâche d'arrière plan démarrée");
}
catch (Exception exception)
{
Debug.WriteLine(exception.Message);
}
}
}
Wouldn't it be simpler to perform these actions in the App.xaml.cs file when launching OnLaunched? Could we call a function at the end of OnLaunched?

The issue you are facing is that in the if you are checking whether the value was not found:
if (!SocketActivityInformation.AllSockets.TryGetValue(socketId, out socketInformation))
{
// Your code
}
If this value is false, then a value for socketId was not found, therefore socketInformation (which was not initialized) will get the default value, which is null. This is the reason of the problem. You should change your if to enter to the code block if the value was found instead:
if (!SocketActivityInformation.AllSockets.TryGetValue(socketId, out socketInformation))
{
// Your code
}

Send packets through internet using Pcapdotnet

I want to use pcapdotnet to send packet to my free web site, but there are no packets received, can any one tell me where is my fault,
my web site address: www.infinitypower.somee.com
I use ping to get the ip address: 204.27.56.226
the code:
using System;
namespace ClientApplication
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
fillDevice();
}
private void btnInvoke_Click(object sender, EventArgs e)
{
// Take the selected adapter
if (lsDevice.SelectedItem != null)
{
PcapDotNet.Core.PacketDevice selectedDevice = (PcapDotNet.Core.PacketDevice)lsDevice.SelectedItem;
// Open the output device
using (PcapDotNet.Core.PacketCommunicator communicator = selectedDevice.Open(100, PcapDotNet.Core.PacketDeviceOpenAttributes.Promiscuous, 1000))
{
communicator.SendPacket(BuildEthernetPacket());
}
}
else
MessageBox.Show("Select device from the list");
}
private void fillDevice()
{
lsDevice.Items.Clear();
IList allDevices = PcapDotNet.Core.LivePacketDevice.AllLocalMachine;
if (allDevices.Count == 0)
{
lsDevice.Items.Add("No interfaces found! Make sure WinPcap is installed.");
return;
}
// Print the list
for (int i = 0; i != allDevices.Count; ++i)
{
PcapDotNet.Core.LivePacketDevice device = allDevices[i];
lsDevice.Items.Add(device);
}
}
private PcapDotNet.Packets.Packet BuildEthernetPacket()
{
PcapDotNet.Packets.Ethernet.EthernetLayer ethernetLayer = new PcapDotNet.Packets.Ethernet.EthernetLayer();
ethernetLayer.Source = new PcapDotNet.Packets.Ethernet.MacAddress("01:02:03:04:05:06");
ethernetLayer.Destination = new PcapDotNet.Packets.Ethernet.MacAddress("01:02:03:04:05:67");
ethernetLayer.EtherType = PcapDotNet.Packets.Ethernet.EthernetType.IpV4;
ipV4Layer.CurrentDestination = new PcapDotNet.Packets.IpV4.IpV4Address("204.27.56.226");
ipV4Layer.Identification = (ushort)100;
PcapDotNet.Packets.PayloadLayer payloadLayer = new PcapDotNet.Packets.PayloadLayer();
payloadLayer.Data = new PcapDotNet.Packets.Datagram(System.Text.Encoding.UTF8.GetBytes(txPrayload.Text));
PcapDotNet.Packets.PacketBuilder builder = new PcapDotNet.Packets.PacketBuilder(ethernetLayer, ipv4layer, payloadLayer);
return builder.Build(DateTime.Now);
}
}
}

Extract Frames from Video C#

I'm trying to make an app that use the camera to record a video and process the images of the video. Here is what I want. First, my app records a 10 second video with Torch. Second, I use a method to playback the video to see what I record.
I'm stuck on three things.
How can I convert my video into individual frames (images)?
Is it possible to asynchronously convert the video while it is being recorded?
When I do convert the video into individual frames, how do I work with them? Are they JPEGs? Can I simply display them as images? Etc.
Main code:
using System;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Navigation;
namespace App3
{
public sealed partial class MainPage : Page
{
DispatcherTimer D;
double basetimer = 0;
public MainPage()
{
this.InitializeComponent();
this.NavigationCacheMode = NavigationCacheMode.Required;
D = new DispatcherTimer();
D.Interval = new TimeSpan(0, 0, 1);
D.Tick += timer_Tick;
txt.Text = basetimer.ToString();
Play.IsEnabled = false;
}
public Library Library = new Library();
public object PreviewImage { get; private set; }
void timer_Tick(object sender, object e)
{
basetimer = basetimer - 1;
txt.Text = basetimer.ToString();
if (basetimer == 0)
{
D.Stop();
Preview.Source = null;
Library.Stop();
Record.IsEnabled = false;
Play.IsEnabled = true;
Clear.IsEnabled = true;
if (Library._tc.Enabled)
{
Library._tc.Enabled = false;
}
}
}
private void Record_Click(object sender, RoutedEventArgs e)
{
if (Library.Recording)
{
Preview.Source = null;
Library.Stop();
Record.Icon = new SymbolIcon(Symbol.Video);
}
else
{
basetimer = 11;
D.Start();
//D.Tick += timer_Tick;
Display.Source = null;
Library.Record(Preview);
Record.Icon = new SymbolIcon(Symbol.VideoChat);
Record.IsEnabled = false;
Play.IsEnabled = false;
}
}
private async void Play_Click(object sender, RoutedEventArgs e)
{
await Library.Play(Dispatcher, Display);
//Extract_Image_From_Video(Library.buffer);
}
private void Clear_Click(object sender, RoutedEventArgs e)
{
Display.Source = null;
Record.Icon = new SymbolIcon(Symbol.Video);
txt.Text = "0";
basetimer= 0;
Play.IsEnabled = false;
Record.IsEnabled =true;
if (Library.capture != null)
{
D.Stop();
Library.Recording = false;
Preview.Source = null;
Library.capture.Dispose();
Library.capture = null;
basetimer = 11;
}
}
}
}
Library Class:
using System;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Windows.Devices.Enumeration;
using Windows.Media.Capture;
using Windows.Media.Devices;
using Windows.Media.MediaProperties;
using Windows.Storage;
using Windows.Storage.Streams;
using Windows.UI.Core;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Media.Imaging;
using Windows.Graphics.Imaging;
using Emgu.CV.Structure;
using Emgu.CV;
using System.Collections.Generic;
public class Library
{
private const string videoFilename = "video.mp4";
private string filename;
public MediaCapture capture;
public InMemoryRandomAccessStream buffer;
public static bool Recording;
public TorchControl _tc;
public int basetimer ;
public async Task<bool> init()
{
if (buffer != null)
{
buffer.Dispose();
}
buffer = new InMemoryRandomAccessStream();
if (capture != null)
{
capture.Dispose();
}
try
{
if (capture == null)
{
var allVideoDevices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
DeviceInformation cameraDevice =
allVideoDevices.FirstOrDefault(x => x.EnclosureLocation != null &&
x.EnclosureLocation.Panel == Windows.Devices.Enumeration.Panel.Back);
capture = new MediaCapture();
var mediaInitSettings = new MediaCaptureInitializationSettings { VideoDeviceId = cameraDevice.Id };
// Initialize
try
{
await capture.InitializeAsync(mediaInitSettings);
var videoDev = capture.VideoDeviceController;
_tc = videoDev.TorchControl;
Recording = false;
_tc.Enabled = false;
}
catch (UnauthorizedAccessException)
{
Debug.WriteLine("UnauthorizedAccessExeption>>");
}
catch (Exception ex)
{
Debug.WriteLine("Exception when initializing MediaCapture with {0}: {1}", cameraDevice.Id, ex.ToString());
}
}
capture.Failed += (MediaCapture sender, MediaCaptureFailedEventArgs errorEventArgs) =>
{
Recording = false;
_tc.Enabled = false;
throw new Exception(string.Format("Code: {0}. {1}", errorEventArgs.Code, errorEventArgs.Message));
};
}
catch (Exception ex)
{
if (ex.InnerException != null && ex.InnerException.GetType() == typeof(UnauthorizedAccessException))
{
throw ex.InnerException;
}
throw;
}
return true;
}
public async void Record(CaptureElement preview)
{
await init();
preview.Source = capture;
await capture.StartPreviewAsync();
await capture.StartRecordToStreamAsync(MediaEncodingProfile.CreateMp4(VideoEncodingQuality.Auto), buffer);
if (Recording) throw new InvalidOperationException("cannot excute two records at the same time");
Recording = true;
_tc.Enabled = true;
}
public async void Stop()
{
await capture.StopRecordAsync();
Recording = false;
_tc.Enabled = false;
}
public async Task Play(CoreDispatcher dispatcher, MediaElement playback)
{
IRandomAccessStream video = buffer.CloneStream();
if (video == null) throw new ArgumentNullException("buffer");
StorageFolder storageFolder = Windows.ApplicationModel.Package.Current.InstalledLocation;
if (!string.IsNullOrEmpty(filename))
{
StorageFile original = await storageFolder.GetFileAsync(filename);
await original.DeleteAsync();
}
await dispatcher.RunAsync(CoreDispatcherPriority.Normal, async () =>
{
StorageFile storageFile = await storageFolder.CreateFileAsync(videoFilename, CreationCollisionOption.GenerateUniqueName);
filename = storageFile.Name;
using (IRandomAccessStream fileStream = await storageFile.OpenAsync(FileAccessMode.ReadWrite))
{
await RandomAccessStream.CopyAndCloseAsync(video.GetInputStreamAt(0), fileStream.GetOutputStreamAt(0));
await video.FlushAsync();
video.Dispose();
}
IRandomAccessStream stream = await storageFile.OpenAsync(FileAccessMode.Read);
playback.SetSource(stream, storageFile.FileType);
playback.Play();
});
}

I ended up using MediaToolkit to solve a similar problem after having a ton of trouble with Accord.
I needed to save an image for every second of a video:
using (var engine = new Engine())
{
var mp4 = new MediaFile { Filename = mp4FilePath };
engine.GetMetadata(mp4);
var i = 0;
while (i < mp4.Metadata.Duration.TotalSeconds)
{
var options = new ConversionOptions { Seek = TimeSpan.FromSeconds(i) };
var outputFile = new MediaFile { Filename = string.Format("{0}\\image-{1}.jpeg", outputPath, i) };
engine.GetThumbnail(mp4, outputFile, options);
i++;
}
}
Hope this helps someone some day.
UPDATE for .NET 5:
Recently, I have needed to update this code to work in .NET 5. To do so, I am using MediaToolkit.NetCore, which has been in preview for over a year. Also note: you will need to make the latest ffmpeg, including all 3 .exe files (ffmpeg, ffplay, ffprobe) available to your app.
Without further ado, here is the updated code:
// _env is the injected IWebHostEnvironment
// _tempPath is temporary file storage
var ffmpegPath = Path.Combine(_env.ContentRootPath, "<path-to-ffmpeg.exe>");
var mediaToolkitService = MediaToolkitService.CreateInstance(ffmpegPath);
var metadataTask = new FfTaskGetMetadata(_tempFile);
var metadata = await mediaToolkitService.ExecuteAsync(metadataTask);
var i = 0;
while (i < metadata.Metadata.Streams.First().DurationTs)
{
var outputFile = string.Format("{0}\\image-{1:0000}.jpeg", _imageDir, i);
var thumbTask = new FfTaskSaveThumbnail(_tempFile, outputFile, TimeSpan.FromSeconds(i));
_ = await mediaToolkitService.ExecuteAsync(thumbTask);
i++;
}

I figured this out just yesterday.
Here is full and easy to understand example with picking video file and saving snapshot in 1st second of video.
You can take parts that fits your project and change some of them (i.e. getting video resolution from camera)
1) and 3)
TimeSpan timeOfFrame = new TimeSpan(0, 0, 1);
//pick mp4 file
var picker = new Windows.Storage.Pickers.FileOpenPicker();
picker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.VideosLibrary;
picker.FileTypeFilter.Add(".mp4");
StorageFile pickedFile = await picker.PickSingleFileAsync();
if (pickedFile == null)
{
return;
}
///
//Get video resolution
List<string> encodingPropertiesToRetrieve = new List<string>();
encodingPropertiesToRetrieve.Add("System.Video.FrameHeight");
encodingPropertiesToRetrieve.Add("System.Video.FrameWidth");
IDictionary<string, object> encodingProperties = await pickedFile.Properties.RetrievePropertiesAsync(encodingPropertiesToRetrieve);
uint frameHeight = (uint)encodingProperties["System.Video.FrameHeight"];
uint frameWidth = (uint)encodingProperties["System.Video.FrameWidth"];
///
//Use Windows.Media.Editing to get ImageStream
var clip = await MediaClip.CreateFromFileAsync(pickedFile);
var composition = new MediaComposition();
composition.Clips.Add(clip);
var imageStream = await composition.GetThumbnailAsync(timeOfFrame, (int)frameWidth, (int)frameHeight, VideoFramePrecision.NearestFrame);
///
//generate bitmap
var writableBitmap = new WriteableBitmap((int)frameWidth, (int)frameHeight);
writableBitmap.SetSource(imageStream);
//generate some random name for file in PicturesLibrary
var saveAsTarget = await KnownFolders.PicturesLibrary.CreateFileAsync("IMG" + Guid.NewGuid().ToString().Substring(0, 4) + ".jpg");
//get stream from bitmap
Stream stream = writableBitmap.PixelBuffer.AsStream();
byte[] pixels = new byte[(uint)stream.Length];
await stream.ReadAsync(pixels, 0, pixels.Length);
using (var writeStream = await saveAsTarget.OpenAsync(FileAccessMode.ReadWrite))
{
var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, writeStream);
encoder.SetPixelData(
BitmapPixelFormat.Bgra8,
BitmapAlphaMode.Premultiplied,
(uint)writableBitmap.PixelWidth,
(uint)writableBitmap.PixelHeight,
96,
96,
pixels);
await encoder.FlushAsync();
using (var outputStream = writeStream.GetOutputStreamAt(0))
{
await outputStream.FlushAsync();
}
}
If you want to display frames in xaml Image, you should use imageStream
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.SetSource(imageStream);
XAMLImage.Source = bitmapImage;
If you want to extract more frames, there is also composition.GetThumbnailsAsync
2) Use your mediaCapture, when your timer is ticking
EDIT:
used includes:
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Threading;
using System.Threading.Tasks;
using Windows.Graphics.Imaging;
using Windows.Media.Editing;
using Windows.Storage;
using Windows.UI.Xaml.Media.Imaging;

Use ffmpeg and install Accord.Video.FFMPEG
using (var vFReader = new VideoFileReader())
{
vFReader.Open("video.mp4");
for (int i = 0; i < vFReader.FrameCount; i++)
{
Bitmap bmpBaseOriginal = vFReader.ReadVideoFrame();
}
vFReader.Close();
}

Another one way to get it :
I used FFMpegCore, official docker image with .net core 3.1 + ubuntu (list of available images)
Dockerfile :
FROM mcr.microsoft.com/dotnet/runtime:3.1-bionic
RUN apt-get update && apt-get install -y ffmpeg libgdiplus
COPY bin/Release/netcoreapp3.1/publish/ App/
WORKDIR /App
ENTRYPOINT ["dotnet", "YouConsoleAppNameHere.dll"]
short code version:
GlobalFFOptions.Configure(new FFOptions { BinaryFolder = "/usr/bin", TemporaryFilesFolder = "/tmp" }); //configuring ffmpeg location
string filePath = AppContext.BaseDirectory + "sample.mp4";
FFMpegArguments.FromFileInput(filePath).OutputToFile("tmp/Video/Frame%05d.png", true, Options => { Options.WithVideoCodec(VideoCodec.Png); }).ProcessSynchronously();
extended version (with some console logs):
using FFMpegCore;
using FFMpegCore.Enums;
...
GlobalFFOptions.Configure(new FFOptions { BinaryFolder = "/usr/bin", TemporaryFilesFolder = "/tmp" }); //configuring ffmpeg location
string filePath = AppContext.BaseDirectory + "sample.mp4";
Console.WriteLine(filePath) ;
Console.WriteLine(File.Exists(filePath));
var mediaInfo = FFProbe.Analyse(filePath);
Console.WriteLine("mp4 duration : " + mediaInfo.Duration);
Directory.CreateDirectory("tmp");
Directory.CreateDirectory("tmp/Video");
Console.WriteLine("started " + DateTime.Now.ToLongTimeString());
FFMpegArguments.FromFileInput(filePath).OutputToFile("tmp/Video/Frame%05d.png", true, Options => { Options.WithVideoCodec(VideoCodec.Png); }).ProcessSynchronously();
Console.WriteLine("processed " + DateTime.Now.ToLongTimeString());
Console.WriteLine(string.Join(", ", Directory.EnumerateFiles("tmp/Video/")));
As a result - png files will be extracted to tmp/Video folder. Of course, you can do the same without docker if you need.

Windows service shuts off after running first record

I have a windows service that is supposed to check for a record, email a report for that record, delete the record and then repeat for the table. It checks for the record, emails a report for the first record then shuts off. Any ideas??
Service code:
namespace ReportSender
{
public partial class EmailReportService : ServiceBase
{
private EmailReportApp _app = new EmailReportApp();
public Timer serviceTimer = new Timer();
public EmailReportService()
{
InitializeComponent();
}
protected override void OnStart(string[] args)
{
//Set interval (from App Settings) and enable timer
serviceTimer.Elapsed += new ElapsedEventHandler(ServiceTimer_OnElapsed);
//Use Conversion utility to determine next start date/time based on properties, use DateTime.Subtract() to find milliseconds difference between Now and the next start time
//serviceTimer.Interval = Date.AddInterval(Properties.Settings.Default.IntervalType, Properties.Settings.Default.Interval).Subtract(DateTime.Now).TotalMilliseconds;
serviceTimer.Interval = 600000;
serviceTimer.Enabled = true;
}
protected override void OnStop()
{
//Stop and disable timer
serviceTimer.Enabled = false;
}
private void ServiceTimer_OnElapsed(object source, ElapsedEventArgs e)
{
try
{
//Stop the timer to prevent overlapping runs
serviceTimer.Stop();
//Start service
//Run your app.Start() code
_app = new EmailReportApp();
_app.Start();
}
catch (Exception ex)
{
}
finally
{
//Re-start the timer
serviceTimer.Start();
}
}
}
}
Code the service is supposed to execute:
namespace ReportSender
{
class EmailReportApp
{
// Private fields
private Thread _thread;
private EventLog _log;
private void Execute()
{
try
{
// Check for a new record
DataClasses1DataContext dc = new DataClasses1DataContext();
foreach (var item in dc.reportsSent1s)
{
string matchedCaseNumber = item.CaseNumberKey;
(new MyReportRenderer()).RenderTest(matchedCaseNumber);
dc.reportsSent1s.DeleteOnSubmit(item);
dc.SubmitChanges();
}
}
catch (ThreadAbortException ex)
{
_log.WriteEntry(ex.StackTrace.ToString());
}
}
public void Start()
{
if (!EventLog.SourceExists("EventLoggerSource"))
EventLog.CreateEventSource("EventLoggerSource", "Event Logger");
_log = new EventLog("EventLoggerSource");
_log.Source = "EventLoggerSource";
_thread = new Thread(new ThreadStart(Execute));
_thread.Start();
}
public void Stop()
{
if (_thread != null)
{
_thread.Abort();
_thread.Join();
}
}
}
public class MyReportRenderer
{
private rs2005.ReportingService2005 rs;
private rs2005Execution.ReportExecutionService rsExec;
public void RenderTest(String matchedCaseNumber)
{
string HistoryID = null;
string deviceInfo = null;
string encoding = String.Empty;
string mimeType = String.Empty;
string extension = String.Empty;
rs2005Execution.Warning[] warnings = null;
string[] streamIDs = null;
rs = new rs2005.ReportingService2005();
rsExec = new rs2005Execution.ReportExecutionService();
rs.Credentials = System.Net.CredentialCache.DefaultCredentials;
rsExec.Credentials = System.Net.CredentialCache.DefaultCredentials;
rs.Url = "http://***.**.***.**/ReportServer_DEVELOPMENT/ReportService2005.asmx";
rsExec.Url = "http://***.**.***.**/ReportServer_DEVELOPMENT/ReportExecution2005.asmx";
try
{
// Load the selected report.
rsExec.LoadReport("/LawDept/LawDeptTIC", HistoryID);
// Set the parameters for the report needed.
rs2005Execution.ParameterValue[] parameters = new rs2005Execution.ParameterValue[1];
parameters[0] = new rs2005Execution.ParameterValue();
parameters[0].Name = "CaseNumberKey";
parameters[0].Value = matchedCaseNumber;
rsExec.SetExecutionParameters(parameters, "en-us");
// get pdf of report
Byte[] results = rsExec.Render("PDF", deviceInfo,
out extension, out encoding,
out mimeType, out warnings, out streamIDs);
//pass paramaters for email
DataClasses1DataContext db = new DataClasses1DataContext();
var matchedBRT = (from c in db.GetTable<vw_ProductClientInfo>()
where c.CaseNumberKey == matchedCaseNumber
select c.BRTNumber).SingleOrDefault();
var matchedAdd = (from c in db.GetTable<vw_ProductClientInfo>()
where c.CaseNumberKey == matchedCaseNumber
select c.Premises).SingleOrDefault();
//send email with attachment
MailMessage message = new MailMessage("234#acmetaxabstracts.com", "georr#gmail.com", "Report for BRT # " + matchedAdd, "Attached if the Tax Information Certificate for the aboved captioned BRT Number");
MailAddress copy = new MailAddress("a123s#gmail.com");
message.CC.Add(copy);
SmtpClient emailClient = new SmtpClient("***.**.***.**");
message.Attachments.Add(new Attachment(new MemoryStream(results), String.Format("{0}" + matchedBRT + ".pdf", "BRT")));
emailClient.Send(message);
}
catch (Exception ex)
{
}
}
}
}

The 'ServiceBase' is losing scope once the OnStart method is called. A 'ManualResetEvent' will keep the service open for you.
Use member:
ManualResetEvent stop = new ManualResetEvent(false);
Try this in your main Start():
do
{
try
{
_app = new EmailReportApp();
_app.Start();
}
catch(Exception e)
{
... handle error or log however you want
}
}
while(!stop.WaitOne(0, false))
in Stop(), make sure to do stop.Set()