feat: trying to create clips...probs a waste of time grrrrrrr

src/StreamShorts.Library/Media/FFMpegService.cs

@@ -1,3 +1,4 @@
+
 using FFMpegCore;
 using FFMpegCore.Enums;
 using FFMpegCore.Pipes;
@@ -21,4 +22,20 @@ internal sealed class FFMpegService : IVideoService
       .ProcessAsynchronously()
       .ConfigureAwait(false);
   }
+
+  public async Task<Stream> ExtractClipFromVideoAsync(Stream video, TimeSpan start, TimeSpan end, TimeSpan? buffer = null)
+  {
+    var startTime = start - (buffer ?? TimeSpan.Zero);
+    var endTime = end + (buffer ?? TimeSpan.Zero);
+    var outputStream = new MemoryStream();
+
+    await FFMpegArguments
+      .FromPipeInput(new StreamPipeSource(video), o => o.Seek(startTime).EndSeek(endTime))
+      .OutputToPipe(new StreamPipeSink(outputStream), o => o.CopyChannel().ForceFormat("webm"))
+      .ProcessAsynchronously()
+      .ConfigureAwait(false);
+
+    outputStream.Position = 0;
+    return outputStream;
+  }
 }

src/StreamShorts.Library/Media/IAudioService.cs

@@ -18,7 +18,7 @@ internal interface IAudioService
   /// <summary>
   /// Gets the number of segments in a WAV stream based on the specified segment duration.
   /// </summary>
-  /// param name="wavStream">The input WAV stream.</param>
+  /// <param name="wavStream">The input WAV stream.</param>
   /// <param name="segmentDuration">The duration of each segment.</param>
   /// <returns>The number of segments.</returns>
   /// <exception cref="ArgumentNullException">Thrown when the WAV stream is null.</exception>
@@ -29,7 +29,7 @@ internal interface IAudioService
   /// <summary>
   /// Gets a segment of a WAV stream based on the specified segment number and duration.
   /// </summary>
-  /// param name="wavStream">The input WAV stream.</param>
+  /// <param name="wavStream">The input WAV stream.</param>
   /// <param name="segmentNumber">The segment number to retrieve.</param>
   /// <param name="segmentDuration">The duration of each segment.</param>
   /// <returns>The segment stream.</returns>

src/StreamShorts.Library/Media/IVideoService.cs

@@ -12,4 +12,14 @@ internal interface IVideoService
   /// <param name="audio">The output audio stream.</param>
   /// <returns>A task that represents the asynchronous operation. The task result indicates whether the extraction was successful.</returns>
   Task<bool> ExtractAudioFromVideoAsync(Stream video, Stream audio);
+
+  /// <summary>
+  /// Extracts a clip from a video stream.
+  /// </summary>
+  /// <param name="video">The input video stream.</param>
+  /// <param name="start">The start time of the clip.</param>
+  /// <param name="end">The end time of the clip.</param>
+  /// <param name="buffer">The duration of the buffer to include before the start time and after the end time.</param>
+  /// <returns>A task that represents the asynchronous operation. The task result contains the extracted clip as a stream.</returns>
+  Task<Stream> ExtractClipFromVideoAsync(Stream video, TimeSpan start, TimeSpan end, TimeSpan? buffer = null);
 }

src/StreamShorts.Library/Media/Video/IShortsCreator.cs

@@ -1,5 +1,20 @@
+using StreamShorts.Library.Analysis;
+
 namespace StreamShorts.Library.Media.Video;
 
+/// <summary>
+/// Represents a service that creates video shorts.
+/// </summary>
 public interface IShortsCreator
 {
+  /// <summary>
+  /// Creates video shorts from the provided transcript analysis and video stream.
+  /// </summary>
+  /// <param name="analysis">The transcript analysis.</param>
+  /// <param name="video">The video stream.</param>
+  /// <param name="buffer">An optional buffer duration to include before the start time and after the end time of each short.</param>
+  /// <returns>An asynchronous enumerable of <see cref="ShortClip"/>.</returns>
+  /// <exception cref="ArgumentNullException">Thrown when <paramref name="analysis"/> is null.</exception>
+  /// <exception cref="ArgumentNullException">Thrown when <paramref name="video"/> is null.</exception>
+  public IAsyncEnumerable<ShortClip> CreateShortsAsync(TranscriptAnalysis analysis, Stream video, TimeSpan? buffer = null);
 }

src/StreamShorts.Library/Media/Video/ShortClip.cs

@@ -0,0 +1,11 @@
+using StreamShorts.Library.Analysis;
+
+namespace StreamShorts.Library.Media.Video;
+
+/// <summary>
+/// Represents a short video clip.
+/// </summary>
+public record ShortClip(
+  ShortCandidate Candidate,
+  Stream Segment
+);

src/StreamShorts.Library/Media/Video/ShortsCreator.cs

@@ -1,5 +1,45 @@
+using StreamShorts.Library.Analysis;
+
 namespace StreamShorts.Library.Media.Video;
 
+/// <summary>
+/// Represents a service that creates video shorts.
+/// </summary>
+/// <inheritdoc/>
 public class ShortsCreator : IShortsCreator
 {
-}
+  private readonly IVideoService _videoService = new FFMpegService();
+
+  public ShortsCreator()
+  {
+  }
+
+  internal ShortsCreator(IVideoService videoService)
+  {
+    _videoService = videoService ?? throw new ArgumentNullException(nameof(videoService), $"{nameof(videoService)} cannot be null");
+  }
+
+  public async IAsyncEnumerable<ShortClip> CreateShortsAsync(TranscriptAnalysis analysis, Stream video, TimeSpan? buffer = null)
+  {
+    if (analysis is null)
+    {
+      throw new ArgumentNullException(nameof(analysis), $"{nameof(analysis)} cannot be null");
+    }
+
+    if (video is null)
+    {
+      throw new ArgumentNullException(nameof(video), $"{nameof(video)} cannot be null");
+    }
+
+    foreach (var candidate in analysis.Candidates)
+    {
+      var clip = await _videoService.ExtractClipFromVideoAsync(video, candidate.StartTime, candidate.EndTime, buffer)
+        .ConfigureAwait(false);
+
+      yield return new ShortClip(
+        candidate,
+        clip
+      );
+    }
+  }
+}