feat: add ffmpeg support for video analysis and screenshots

src/CasaBot/CasaBotApp/FFMPEGWrapper.cs

@@ -0,0 +1,87 @@
+using Microsoft.Extensions.Logging;
+using System.Diagnostics;
+
+namespace CasaBotApp;
+
+public class FfmpegWrapper
+{
+    private readonly ILogger<FfmpegWrapper> _logger;
+
+    public FfmpegWrapper(ILogger<FfmpegWrapper> logger)
+    {
+        _logger = logger;
+    }
+
+    private const string FFMPEG_PATH = @".\dvr-scanner\ffmpeg.exe";
+    //Include method for get duration of a video, extract the frame at a specific time
+    
+    public async Task<TimeSpan> GetVideoDuration(string videoPath)
+    {
+        try
+        {
+            _logger.LogDebug("Getting video duration...");
+            var ffmpegProcess = new Process
+            {
+                StartInfo = new ProcessStartInfo
+                {
+                    FileName = FFMPEG_PATH,
+                    Arguments = $"-i {videoPath}",
+                    RedirectStandardOutput = false,
+                    UseShellExecute = false,
+                    CreateNoWindow = true,
+                    RedirectStandardError = true
+                }
+            };
+            ffmpegProcess.Start();
+            
+            var standardError = await ffmpegProcess.StandardError.ReadToEndAsync();
+            await ffmpegProcess.WaitForExitAsync();
+            
+            // Parse the duration from the ffmpeg output
+            var durationString = System.Text.RegularExpressions.Regex.Match(standardError, @"Duration: (\d{2}):(\d{2}):(\d{2})\.(\d{2})").Groups;
+            var ts = new TimeSpan(0,
+                int.Parse(durationString[1].Value),
+                int.Parse(durationString[2].Value),
+                int.Parse(durationString[3].Value),
+                int.Parse(durationString[4].Value) * 10
+            );
+            return ts;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "An error occurred while getting the video duration");
+            throw new Exception("There was an error getting the video duration", ex);
+        }
+    }
+    
+    public async Task ExtractFrame(string videoPath, string outputPath, TimeSpan time)
+    {
+        try
+        {
+            var timeParam = $"{time.Minutes:D2}:{time.Seconds:D2}.{time.Milliseconds:D2}";
+            _logger.LogDebug("Extracting frame: {videoPath} at {time} to {outputPath}", videoPath, timeParam, outputPath);
+            var ffmpegProcess = new Process
+            {
+                StartInfo = new ProcessStartInfo
+                {
+                    FileName = FFMPEG_PATH,
+                    Arguments = $"-y -i {videoPath} -ss {timeParam} -vframes 1 {outputPath}",
+                    RedirectStandardOutput = false,
+                    UseShellExecute = false,
+                    CreateNoWindow = true,
+                    RedirectStandardError = false
+                }
+            };
+            ffmpegProcess.Start();
+            _logger.LogDebug("Waiting for frame extraction... process ID: {Id}", ffmpegProcess.Id);
+            await ffmpegProcess.WaitForExitAsync();
+            _logger.LogInformation("Frame extracted successfully!");
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "An error occurred while extracting the frame");
+            throw new Exception("There was an error extracting the frame", ex);
+        }
+    }
+    
+}