feat: initialise project structure with core encoding queue, database models, and web management API

internal/encoder/video.go

@@ -0,0 +1,75 @@
+package encoder
+
+import (
+	"fmt"
+	"os/exec"
+	"strconv"
+	"strings"
+)
+
+func (m *FFmpegManager) BuildVideoCmd(inputPath, outputPath, targetResolution, ffmpegFlags string, originalWidth, originalHeight int) (*exec.Cmd, error) {
+	args := []string{"-i", inputPath}
+
+	if targetResolution != "" {
+		targetHeightStr := strings.TrimRight(strings.ToLower(targetResolution), "p")
+		targetHeight, err := strconv.Atoi(targetHeightStr)
+		if err == nil && targetHeight > 0 && originalHeight > targetHeight {
+			scaleWidth := int((float64(originalWidth) / float64(originalHeight)) * float64(targetHeight))
+			if scaleWidth%2 != 0 {
+				scaleWidth--
+			}
+			args = append(args, "-vf", fmt.Sprintf("scale=%d:%d", scaleWidth, targetHeight))
+		}
+	}
+
+	args = append(args, "-c:v", "libx265", "-c:a", "copy", "-preset", "medium", "-crf", "22", "-f", "matroska")
+
+	if ffmpegFlags != "" {
+		userArgs := ShlexSplit(ffmpegFlags)
+		args = append(args, userArgs...)
+	}
+
+	args = append(args, outputPath, "-y")
+
+	return exec.Command(m.BinaryPath, args...), nil
+}
+
+func (m *FFmpegManager) ShouldSkipVideo(inputPath, targetResolution string) bool {
+	// Probe the codec
+	cmd := exec.Command("ffprobe", "-v", "quiet", "-select_streams", "v:0",
+		"-show_entries", "stream=codec_name", "-of", "csv=p=0", inputPath)
+	out, err := cmd.Output()
+	if err != nil {
+		return false
+	}
+	codec := strings.TrimSpace(string(out))
+
+	// Probe the height
+	cmdHeight := exec.Command("ffprobe", "-v", "quiet", "-select_streams", "v:0",
+		"-show_entries", "stream=height", "-of", "csv=p=0", inputPath)
+	outHeight, err := cmdHeight.Output()
+	if err != nil {
+		return false
+	}
+	
+	// If it's not H.264 or H.265, do not skip (encode it)
+	if codec != "h264" && codec != "hevc" {
+		return false
+	}
+	
+	// If it's H.265 and no target resolution is set, it's already in the target codec
+	if codec == "hevc" && targetResolution == "" {
+		return true
+	}
+	
+	// If it's H.265 and target resolution is set, only skip if current height is <= target height
+	if codec == "hevc" && targetResolution != "" {
+		currentHeight, _ := strconv.Atoi(strings.TrimSpace(string(outHeight)))
+		targetHeight, _ := strconv.Atoi(strings.TrimRight(strings.ToLower(targetResolution), "p"))
+		if currentHeight > 0 && targetHeight > 0 && currentHeight <= targetHeight {
+			return true
+		}
+	}
+	
+	return false
+}