Add Linux/Windows support

utils/interpolate.py

@@ -40,20 +40,43 @@ def _interpolate(
     vapoursynth_file: str,
     interpolate_output: str,
 ):
-    cmd = [
-        "vspipe", 
-        "-c", "y4m",
-        vapoursynth_file,
-        "-", "|",
-        "ffmpeg", "-v", "quiet", "-stats",
-        "-i", "-",
-        "-c:v", "hevc_nvenc",
-        "-qp", "5",
-        interpolate_output
-    ]
+    print('Started Interpolation')
 
     try:
-        subprocess.run(cmd, shell=True, check=True)
+        # First process (vspipe)
+        vspipe = subprocess.Popen(
+            [
+                "vspipe",
+                "-c", "y4m",
+                vapoursynth_file,
+                "-"
+            ],
+            stdout=subprocess.PIPE
+        )
+
+        # Second process (ffmpeg), reading from vspipe
+        ffmpeg = subprocess.Popen(
+            [
+                "ffmpeg",
+                "-v", "quiet", "-stats",
+                "-f", "yuv4mpegpipe",
+                "-i", "-",
+                "-c:v", "hevc_nvenc",
+                "-qp", "5",
+                interpolate_output
+            ],
+            stdin=vspipe.stdout
+        )
+
+        # Important: allow vspipe to receive SIGPIPE if ffmpeg exits
+        vspipe.stdout.close()
+
+        ffmpeg.wait()
+        vspipe.wait()
+
+        if ffmpeg.returncode != 0:
+            raise subprocess.CalledProcessError(ffmpeg.returncode, "ffmpeg")
+    
     except subprocess.CalledProcessError as e:
         print(f"\nffmpeg failed with error code {e.returncode}", file=sys.stderr)
         sys.exit(e.returncode)