feat: add CLI options to control XMP metadata clearing

- Add --clear-xmp/--keep-xmp options to control whether to clear previous XMP metadata
- Default behavior remains to clear XMP metadata to avoid conflicts (preserves current behavior)
- Users can now use --keep-xmp to preserve previous XMP metadata if needed
- Available in both specific mode (live-photo-make) and generic mode (live-photo-conv --make)

Signed-off-by: Zhou Qiankang <wszqkzqk@qq.com>

Author: wszqkzqk

src/livemaker.vala

@@ -45,6 +45,11 @@ public abstract class LivePhotoConv.LiveMaker : Object {
         set;
         default = true;
     }
+    public bool clear_xmp_metadata {
+        get;
+        set;
+        default = true;
+    }
 
     /**
      * Creates a new LiveMaker instance.
@@ -175,7 +180,9 @@ public abstract class LivePhotoConv.LiveMaker : Object {
         }
 
         // Clear previous XMP metadata to avoid conflicts
-        this.metadata.clear_xmp ();
+        if (this.clear_xmp_metadata) {
+            this.metadata.clear_xmp ();
+        }
 
         // Create the live photo file from the main image and then append the video
         var live_file = this.export_main_image ();

src/livemakerffmpeg.vala

@@ -56,7 +56,9 @@ public class LivePhotoConv.LiveMakerFFmpeg : LivePhotoConv.LiveMaker {
         }
 
         // Clear previous XMP metadata to avoid conflicts
-        this.metadata.clear_xmp ();
+        if (this.clear_xmp_metadata) {
+            this.metadata.clear_xmp ();
+        }
 
         var live_file = File.new_for_commandline_arg  (this.dest);
         var video_file = File.new_for_commandline_arg  (this.video_path);

src/livemakergst.vala

@@ -46,7 +46,9 @@ public class LivePhotoConv.LiveMakerGst : LivePhotoConv.LiveMaker {
         }
 
         // Clear previous XMP metadata to avoid conflicts
-        this.metadata.clear_xmp ();
+        if (this.clear_xmp_metadata) {
+            this.metadata.clear_xmp ();
+        }
 
         var live_file = File.new_for_commandline_arg  (this.dest);
         var video_file = File.new_for_commandline_arg  (this.video_path);

src/main.vala

@@ -37,6 +37,7 @@ class LivePhotoConv.Main {
     static bool export_metadata = true;
     static bool frame_to_photo = false;
     static bool minimal_export = false;
+    static bool clear_xmp_metadata = true;
     static int threads = 0;
 #if ENABLE_GST
     static bool use_ffmpeg = false;
@@ -51,6 +52,8 @@ class LivePhotoConv.Main {
         { "output", 'o', OptionFlags.NONE, OptionArg.FILENAME, ref live_photo_path, "The output live photo file path", "PATH" },
         { "export-metadata", '\0', OptionFlags.NONE, OptionArg.NONE, ref export_metadata, "Export metadata (default)", null },
         { "drop-metadata", '\0', OptionFlags.REVERSE, OptionArg.NONE, ref export_metadata, "Do not export metadata", null },
+        { "clear-xmp", '\0', OptionFlags.NONE, OptionArg.NONE, ref clear_xmp_metadata, "Clear previous XMP metadata to avoid conflicts (default)", null },
+        { "keep-xmp", '\0', OptionFlags.REVERSE, OptionArg.NONE, ref clear_xmp_metadata, "Keep previous XMP metadata", null },
 #if ENABLE_GST
         { "use-ffmpeg", '\0', OptionFlags.NONE, OptionArg.NONE, ref use_ffmpeg, "Use FFmpeg to extract instead of GStreamer", null },
         { "use-gst", '\0', OptionFlags.REVERSE, OptionArg.NONE, ref use_ffmpeg, "Use GStreamer to extract instead of FFmpeg (default)", null },
@@ -103,6 +106,8 @@ class LivePhotoConv.Main {
         { "dest-dir", 'd', OptionFlags.NONE, OptionArg.FILENAME, ref dest_dir, "The destination directory to export", "PATH" },
         { "export-metadata", '\0', OptionFlags.NONE, OptionArg.NONE, ref export_metadata, "Export metadata (default)", null },
         { "drop-metadata", '\0', OptionFlags.REVERSE, OptionArg.NONE, ref export_metadata, "Do not export metadata", null },
+        { "clear-xmp", '\0', OptionFlags.NONE, OptionArg.NONE, ref clear_xmp_metadata, "Clear previous XMP metadata to avoid conflicts (default)", null },
+        { "keep-xmp", '\0', OptionFlags.REVERSE, OptionArg.NONE, ref clear_xmp_metadata, "Keep previous XMP metadata", null },
         { "frame-to-photos", '\0', OptionFlags.NONE, OptionArg.NONE, ref frame_to_photo, "Export every frame of a live photo's video as a photo", null },
         { "img-format", 'f', OptionFlags.NONE, OptionArg.STRING, ref img_format, "The format of the image exported from video", "FORMAT" },
         { "minimal", '\0', OptionFlags.NONE, OptionArg.NONE, ref minimal_export, "Minimal metadata export, ignore unspecified exports", null },
@@ -253,15 +258,18 @@ class LivePhotoConv.Main {
         if (use_ffmpeg) {
             live_maker = new LiveMakerFFmpeg (video_path, main_image_path, live_photo_path)  {
                 export_original_metadata = export_metadata,
+                clear_xmp_metadata = clear_xmp_metadata,
             };
         } else {
             live_maker = new LiveMakerGst (video_path, main_image_path, live_photo_path)  {
                 export_original_metadata = export_metadata,
+                clear_xmp_metadata = clear_xmp_metadata,
             };
         }
 #else
         LiveMaker live_maker = new LiveMakerFFmpeg (video_path, main_image_path, live_photo_path)  {
             export_original_metadata = export_metadata,
+            clear_xmp_metadata = clear_xmp_metadata,
         };
 #endif
         live_maker.export ();