fix sync bug in ffmpeg command

Author: darsnack

packages/cheese3d/cheese3d/synchronize/core.py

@@ -237,7 +237,7 @@ def synchronize_videos(pipeline_cfg: SyncConfig,
                                  threshold=pipeline_cfg.led_threshold,
                                  peak_algorithm=pipeline_cfg.led_peak_algorithm,
                                  crop=ref_crop)
-    align_params = {"ref": (ref_video, 0, fps)}
+    align_params = {}
     for view, (video, crop) in videos.items():
         target_reader = VideoSyncReader(source=video,
                                         sample_rate=fps,

packages/cheese3d/cheese3d/utils.py

@@ -139,9 +139,9 @@ def dlc_folder_to_components(folder: str | Path):
 def synchronize_video_ffmpeg(videos, start_offset = 0, fps = None):
     for video in videos:
         if start_offset > 0:
-            filter_args = f"[0:v]select='gt(n\,{start_offset})'[trim];[trim]"
+            filter_args = f"[0:v]select='gt(n\,{start_offset})'[out]"
         else:
-            filter_args = "[0:v]"
+            filter_args = "[0:v]null[out]"
         if fps is not None:
             input_fps = ["-r", f"{100 * fps/100}/1"]
             output_fps = ["-r", "100/1"]
@@ -165,7 +165,7 @@ def synchronize_video_ffmpeg(videos, start_offset = 0, fps = None):
             video
         ])
         if cmd.returncode:
-            raise RuntimeError("Failed to get video resolution "
+            raise RuntimeError("Failed to run ffmpeg sync "
                                f"(return code = {cmd.returncode}, "
                                f"args = {cmd.args})")