chore: Add ffmpeg binaries to .gitignore (too large for GitHub)

- FFmpeg executables exceed GitHub's 100MB file size limit
- Added ffmpeg/bin/*.exe and *.dll to .gitignore
- Removed from git tracking
- Users should download FFmpeg separately from ffmpeg.org
- Also added test output files to .gitignore

Author: michshat

.gitignore

@@ -61,3 +61,13 @@ outputs/*/frames/
 demo_reel/*/prep_data.json
 demo_reel/*/*.mp4
 demo_reel/*/*.avi
+
+# FFmpeg binaries (too large for GitHub - download separately)
+ffmpeg/ffmpeg-master-latest-win64-gpl/bin/*.exe
+ffmpeg/ffmpeg-master-latest-win64-gpl/bin/*.dll
+
+# Test output files
+*.log
+pil_test_output.txt
+rigged_*.log
+test_output.log