Update app.py

app.py

@@ -73,9 +73,10 @@ def subliminal_insert(
             v = ffmpeg.filter(
                 [input_video, input_image],
                 'overlay',
-                enable=
-                f'if(lt(mod(n,{interval_frames}),{duration_frames}),1,0)',
-                alpha=alpha)
+                enable=f'if(lt(mod(n,{interval_frames}),{duration_frames}),1,0)',
+                format='yuva444p',  # 确保支持alpha通道
+                alpha=f"if(lt(mod(n,{interval_frames}),{duration_frames}),{alpha},0)"  # 动态设置alpha值
+            )
 
             # 检查输入视频是否有音频流
             has_audio = any(s['codec_type'] == 'audio'
@@ -84,20 +85,22 @@ def subliminal_insert(
             # 构建输出
             if has_audio:
                 stream = ffmpeg.output(v,
-                                       input_video.audio,
-                                       temp_output,
-                                       acodec='copy',
-                                       vcodec='libx264',
-                                       preset='ultrafast',
-                                       crf=23,
-                                       movflags='+faststart')
+                                    input_video.audio,
+                                    temp_output,
+                                    acodec='copy',
+                                    vcodec='libx264',
+                                    pix_fmt='yuv420p',  # 确保输出格式兼容
+                                    preset='ultrafast',
+                                    crf=23,
+                                    movflags='+faststart')
             else:
                 stream = ffmpeg.output(v,
-                                       temp_output,
-                                       vcodec='libx264',
-                                       preset='ultrafast',
-                                       crf=23,
-                                       movflags='+faststart')
+                                    temp_output,
+                                    vcodec='libx264',
+                                    pix_fmt='yuv420p',  # 确保输出格式兼容
+                                    preset='ultrafast',
+                                    crf=23,
+                                    movflags='+faststart')
 
             # 打印完整命令
             cmd = " ".join(stream.compile())