Refactor MP4 to MOV conversion in premiere_to_resolve.py to ensure compatibility with DaVinci Resolve on Linux. The script now re-encodes to ProRes 422 HQ, with fallbacks to DNxHD and H.264, improving reliability and quality of output files. Update error handling for ffmpeg availability and conversion timeouts.

premiere_to_resolve.py

@@ -3,7 +3,9 @@
 Premiere to Resolve XML Converter
 
 Processes Adobe Premiere Pro XML exports to make them compatible with DaVinci Resolve on Linux.
-Updates file paths and optionally converts MP4 files to MOV format.
+Updates file paths and optionally converts MP4 files to MOV by re-encoding to Resolve-friendly
+codecs (ProRes 422 HQ, DNxHD, or H.264 in MOV). Stream copy is not used so Resolve can read
+the resulting files on Linux.
 """
 
 import os
@@ -121,11 +123,11 @@ def find_local_files(video_refs: Set[Tuple[str, str]], directory: str) -> Dict[s
 
 def convert_mp4_to_mov(input_file: str, output_file: str) -> bool:
     """
-    Convert MP4 to MOV using ffmpeg with minimal quality loss.
+    Convert MP4 to MOV by re-encoding to a codec DaVinci Resolve on Linux supports.
 
-    Strategy:
-    1. Try copy codecs first (lossless if compatible)
-    2. Fallback to high-quality encoding
+    Resolve on Linux does not reliably support H.264-in-MP4 or stream-copied
+    codecs in MOV. We always re-encode to ProRes 422 HQ (decode-only on Linux
+    but fully supported for import), with fallback to DNxHD or H.264 in MOV.
     """
     # Check if output file already exists
     if os.path.exists(output_file):
@@ -133,59 +135,93 @@ def convert_mp4_to_mov(input_file: str, output_file: str) -> bool:
         if response.lower() != 'y':
             return False
 
-    # Try copy codecs first (lossless if compatible)
-    cmd_copy = [
-        'ffmpeg', '-i', input_file,
-        '-c:v', 'copy',
-        '-c:a', 'copy',
-        '-y',  # Overwrite output file
-        output_file
-    ]
+    try:
+        subprocess.run(["ffmpeg", "-version"], capture_output=True, timeout=5)
+    except (FileNotFoundError, subprocess.TimeoutExpired):
+        print("Error: ffmpeg not found. Please install ffmpeg.", file=sys.stderr)
+        return False
 
+    # 1. Prefer ProRes 422 HQ – well supported for import in Resolve on Linux
+    cmd_prores = [
+        "ffmpeg",
+        "-i",
+        input_file,
+        "-c:v",
+        "prores",
+        "-profile:v",
+        "2",  # ProRes 422 HQ
+        "-c:a",
+        "pcm_s16le",  # Uncompressed audio, always supported
+        "-y",
+        output_file,
+    ]
     try:
         result = subprocess.run(
-            cmd_copy,
-            capture_output=True,
-            text=True,
-            timeout=3600  # 1 hour timeout
+            cmd_prores, capture_output=True, text=True, timeout=3600
         )
-        
         if result.returncode == 0:
-            print(f"  Converted (copy codecs): {os.path.basename(input_file)} -> {os.path.basename(output_file)}")
+            print(
+                f"  Converted (ProRes 422 HQ): {os.path.basename(input_file)} -> {os.path.basename(output_file)}"
+            )
             return True
     except subprocess.TimeoutExpired:
         print(f"  Timeout converting {input_file}", file=sys.stderr)
         return False
-    except FileNotFoundError:
-        print("Error: ffmpeg not found. Please install ffmpeg.", file=sys.stderr)
+
+    # 2. Fallback: DNxHD 120 (1080p-friendly, full encode/decode support on Resolve Linux)
+    print(f"  ProRes failed, trying DNxHD for {os.path.basename(input_file)}")
+    cmd_dnx = [
+        "ffmpeg",
+        "-i",
+        input_file,
+        "-c:v",
+        "dnxhd",
+        "-b:v",
+        "120M",  # DNxHD 120 Mbps (1080p)
+        "-c:a",
+        "pcm_s16le",
+        "-y",
+        output_file,
+    ]
+    try:
+        result = subprocess.run(cmd_dnx, capture_output=True, text=True, timeout=3600)
+        if result.returncode == 0:
+            print(
+                f"  Converted (DNxHD): {os.path.basename(input_file)} -> {os.path.basename(output_file)}"
+            )
+            return True
+    except subprocess.TimeoutExpired:
+        print(f"  Timeout converting {input_file}", file=sys.stderr)
         return False
 
-    # Fallback to high-quality encoding
-    print(f"  Copy codecs not compatible, using high-quality encoding for {os.path.basename(input_file)}")
-    cmd_encode = [
-        'ffmpeg', '-i', input_file,
-        '-c:v', 'libx264',
-        '-crf', '18',  # High quality (lower = better quality)
-        '-preset', 'slow',  # Better compression
-        '-c:a', 'copy',  # Copy audio
-        '-y',
-        output_file
+    # 3. Last resort: H.264 in MOV (re-encoded, not copy)
+    print(f"  DNxHD failed, using H.264 in MOV for {os.path.basename(input_file)}")
+    cmd_h264 = [
+        "ffmpeg",
+        "-i",
+        input_file,
+        "-c:v",
+        "libx264",
+        "-crf",
+        "18",
+        "-preset",
+        "slow",
+        "-pix_fmt",
+        "yuv420p",  # Maximum compatibility
+        "-c:a",
+        "pcm_s16le",
+        "-y",
+        output_file,
     ]
-    
     try:
-        result = subprocess.run(
-            cmd_encode,
-            capture_output=True,
-            text=True,
-            timeout=3600
-        )
-        
+        result = subprocess.run(cmd_h264, capture_output=True, text=True, timeout=3600)
         if result.returncode == 0:
-            print(f"  Converted (encoded): {os.path.basename(input_file)} -> {os.path.basename(output_file)}")
+            print(
+                f"  Converted (H.264 MOV): {os.path.basename(input_file)} -> {os.path.basename(output_file)}"
+            )
             return True
-        else:
-            print(f"  Error converting {input_file}: {result.stderr}", file=sys.stderr)
-            return False
+        print(f"  Error converting {input_file}: {result.stderr}", file=sys.stderr)
+        return False
     except subprocess.TimeoutExpired:
         print(f"  Timeout converting {input_file}", file=sys.stderr)
         return False