Add FFMPEG_NOTES.md detailing current ffmpeg settings

FFMPEG_NOTES.md

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+# FFmpeg Configuration Notes for Video Converter Project
+
+This document details the `ffmpeg` settings and considerations used within the Video Converter project, especially concerning DaVinci Resolve compatibility.
+
+## Current Default Conversion Settings (as of 2025-10-31)
+
+The project currently uses the following `ffmpeg` settings for converting video files to DaVinci Resolve compatible formats (Free Linux version, targeting 1080p60 and 1440p60):
+
+*   **Video Codec:** `dnxhd` (DNxHD/HR)
+    *   **Profile for 1080p (<=1080 height):** `dnxhr_hq` (DNxHR High Quality)
+    *   **Profile for 1440p (>1080 height):** `dnxhr_hqx` (DNxHR High Quality X)
+    *   **Pixel Format:** `yuv422p` (4:2:2 chroma subsampling, 8-bit) - *Note: The `dnxhr_hq` and `dnxhr_hqx` profiles inherently imply 10-bit where applicable, but `yuv422p` is a common base.*
+*   **Audio Codec:** `pcm_s16le` (Linear PCM, 16-bit signed little-endian)
+*   **Container:** `.mov` (QuickTime)
+
+### Example `ffmpeg` Command Structure (simplified):
+
+```bash
+ffmpeg -i input.mp4 -c:v dnxhd -profile:v dnxhr_hqx -pix_fmt yuv422p -c:a pcm_s16le output.mov
+```
+
+## Rationale for Choices:
+
+*   **`dnxhd` codec:** Chosen for its excellent compatibility and performance as an intermediate editing codec in DaVinci Resolve, especially on Linux. It provides high quality and is an intraframe codec.
+*   **`dnxhr_hq` / `dnxhr_hqx` profiles:** Selected to ensure high-quality output suitable for professional editing, balancing file size and visual fidelity. `dnxhr_hqx` offers even higher quality for higher resolutions.
+*   **`pcm_s16le` audio:** Used to avoid known compatibility issues with AAC audio in DaVinci Resolve on Linux, ensuring reliable audio playback. PCM is uncompressed and lossless.
+*   **`.mov` container:** Recommended for its robustness and better metadata handling with DaVinci Resolve for intermediate files.
+
+## Alternative Approaches / Future Considerations:
+
+*   **ProRes:** While `ffmpeg` can encode ProRes, its use on Linux with DaVinci Resolve Free might be limited or require specific `ffmpeg` builds/licenses. It could be an alternative if `dnxhd` proves problematic or if a user specifically requests it.
+*   **High-Quality H.264/H.265:** For scenarios where file size is a primary concern and editing performance is secondary (e.g., proxy generation or final delivery), high-bitrate H.264/H.265 could be considered. However, these are interframe codecs and generally less ideal for direct editing.
+*   **Pixel Format:** Further investigation into `yuv422p10le` (10-bit 4:2:2) might be warranted if the source is 10-bit and the target Davinci Resolve version fully supports it for `dnxhd` in the free version.
+
+---
+*Document generated by Gemini CLI Agent.*