don't crash just skip adjustment if player is still loading

player/player.py

@@ -142,7 +142,10 @@ class Sync(Thread):
 
     def adjust_position(self):
         if self.mpv.time_pos is not None:
-            deviation = self.main.time_pos - self.mpv.time_pos
+            try:
+                deviation = self.main.time_pos - self.mpv.time_pos
+            except:
+                return
             self.deviations.append(deviation)
             median_deviation = self.median(list(self.deviations))
             frames = deviation / 0.04
@@ -163,7 +166,7 @@ class Sync(Thread):
         if self.main.playlist_current_pos != self.mpv.playlist_current_pos:
             self.mpv.playlist_play_index(self.main.playlist_current_pos)
             self.mpv.pause = False
-            time.sleep(0.1)
+            self.mpv.wait_until_playing()
         self.mpv.pause = True
         pos = self.main.time_pos + SYNC_JUMP_AHEAD
         #print(pos, self.mpv.playlist_current_pos, self.mpv.time_pos)

sax.py

@@ -0,0 +1,78 @@
+#!/usr/bin/python3
+import os
+from render_kdenlive import KDEnliveProject, _CACHE
+import subprocess
+
+def generate_sax_mix(root):
+    os.chdir(root)
+
+
+root = os.path.abspath(".")
+project = KDEnliveProject(root)
+
+long_wav = "Soon_Kim_Long_Reverb_Only2.wav"
+nois_wav = "Soon_Kim_Noise.wav"
+reverb_wav = "Soon_Kim_Short_Reverb_Mix2.wav"
+
+
+long = {
+    "src": long_wav,
+    "duration": 3600.0,
+    "filter": {
+        "volume": "-3"
+    },
+}
+noise = {
+    "src": nois_wav,
+    "duration": 3600.0,
+    "filter": {
+        "volume": "-1"
+    },
+}
+project.append_clip('A1', long)
+project.append_clip('A2', noise)
+path = os.path.join(root, "sax-mix.kdenlive")
+with open(path, 'w') as fd:
+    fd.write(project.to_xml())
+
+cmds = []
+cmds.append([
+    "melt", "sax-mix.kdenlive", '-quiet', '-consumer', 'avformat:sax-mix.wav'
+])
+cmds.append([
+    "ffmpeg", "-y",
+    "-nostats", "-loglevel", "error",
+    "-f", "lavfi", "-i", "anullsrc=r=48000:cl=mono", "-t", "3600", "silence.wav"
+])
+
+for src, out1, out2 in (
+    (reverb_wav, "fl.wav", "fr.wav"),
+    ("sax-mix.wav", "bl.wav", "br.wav"),
+):
+    cmds.append([
+        "ffmpeg", "-y",
+        "-nostats", "-loglevel", "error",
+        "-i", src,
+        "-filter_complex",
+        "[0:0]pan=1|c0=c0[left]; [0:0]pan=1|c0=c1[right]",
+        "-map", "[left]", out1,
+        "-map", "[right]", out2,
+    ])
+
+cmds.append([
+    "ffmpeg", "-y",
+    "-nostats", "-loglevel", "error",
+    "-i", "fl.wav",
+    "-i", "fr.wav",
+    "-i", "silence.wav",
+    "-i", "silence.wav",
+    "-i", "bl.wav",
+    "-i", "br.wav",
+    "-filter_complex", "[0:a][1:a][2:a][3:a][4:a][5:a]amerge=inputs=6[a]",
+    "-map", "[a]",
+    "-ar", "48000",
+    "-c:a", "aac", "Saxophone-5.1.mp4"
+])
+for cmd in cmds:
+    print(" ".join([str(x) for x in cmd]))
+    subprocess.call(cmd)