Fix: Stereo-Crossfade, AudioGen use_sampling, Workflow Positionen

- MusicGenLong: Crossfade expand fuer Stereo-Audio (2 Kanäle)
- MusicGenLong: Segmentzaehler mit math.ceil statt int+1
- AudioGen: use_sampling=True hinzugefuegt
- workflow_music.json: Node-Positionen der unteren Pipeline korrigiert

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

comfyui-audio/comfyui_audiocraft/nodes.py

@@ -85,7 +85,9 @@ class MusicGenLongNode:
         from audiocraft.data.audio import audio_write
 
         torch.manual_seed(seed)
-        print(f"[MusicGenLong] Model: {model}, Ziel: {total_duration}s in {segment_duration}s Segmenten")
+        import math
+        total_segments = math.ceil(total_duration / segment_duration)
+        print(f"[MusicGenLong] Model: {model}, Ziel: {total_duration}s in {total_segments} Segmenten à {segment_duration}s")
 
         mg = MusicGen.get_pretrained(model)
         sample_rate = mg.sample_rate
@@ -94,7 +96,7 @@ class MusicGenLongNode:
         # Erstes Segment
         gen_params = dict(use_sampling=True, temperature=temperature, cfg_coef=cfg_coef, top_k=top_k, top_p=0.0)
         mg.set_generation_params(duration=segment_duration, **gen_params)
-        print(f"[MusicGenLong] Segment 1 / {int(total_duration / segment_duration) + 1}")
+        print(f"[MusicGenLong] Segment 1 / {total_segments}")
         first = mg.generate([prompt])
         segments = [first[0].cpu()]
         generated = segment_duration
@@ -114,12 +116,13 @@ class MusicGenLongNode:
             generated += next_dur
             seg_num += 1
 
-        # Crossfade und zusammenfügen
+        # Crossfade und zusammenfügen (funktioniert für Mono und Stereo)
         crossfade_samples = context_samples
         result = segments[0]
+        num_channels = result.shape[0]
         for seg in segments[1:]:
-            fade_out = torch.linspace(1.0, 0.0, crossfade_samples).unsqueeze(0)
-            fade_in  = torch.linspace(0.0, 1.0, crossfade_samples).unsqueeze(0)
+            fade_out = torch.linspace(1.0, 0.0, crossfade_samples).unsqueeze(0).expand(num_channels, -1)
+            fade_in  = torch.linspace(0.0, 1.0, crossfade_samples).unsqueeze(0).expand(num_channels, -1)
             overlap  = result[:, -crossfade_samples:] * fade_out + seg[:, :crossfade_samples] * fade_in
             result   = torch.cat([result[:, :-crossfade_samples], overlap, seg[:, crossfade_samples:]], dim=1)
 
@@ -162,6 +165,7 @@ class AudioGenNode:
         ag = AudioGen.get_pretrained("facebook/audiogen-medium")
         ag.set_generation_params(
             duration=duration,
+            use_sampling=True,
             temperature=temperature,
             cfg_coef=cfg_coef,
             top_k=top_k,

comfyui-audio/workflow_music.json

@@ -86,10 +86,10 @@
     {
       "id": 2,
       "type": "AudioUpsample",
-      "pos": [580, 100],
+      "pos": [580, 620],
       "size": {"0": 300, "1": 120},
       "flags": {},
-      "order": 1,
+      "order": 4,
       "mode": 0,
       "inputs": [
         {"name": "audio_file", "type": "AUDIO_PATH", "link": 1}
@@ -103,10 +103,10 @@
     {
       "id": 3,
       "type": "AudioPreview",
-      "pos": [930, 100],
+      "pos": [930, 620],
       "size": {"0": 250, "1": 80},
       "flags": {},
-      "order": 2,
+      "order": 5,
       "mode": 0,
       "inputs": [
         {"name": "audio_file", "type": "AUDIO_PATH", "link": 2}