generic preview sound for waveform component

with secret preference to use the audio file again

src/component.py

@@ -427,7 +427,7 @@ class ComponentError(RuntimeError):
         ComponentError.prevErrors.insert(0, name)
         curTime = time.time()
         if name in ComponentError.prevErrors[1:] \
-                and curTime - ComponentError.lastTime < 0.2:
+                and curTime - ComponentError.lastTime < 1.0:
             # Don't create multiple windows for quickly repeated messages
             return
         ComponentError.lastTime = time.time()

src/components/waveform.py

@@ -90,7 +90,7 @@ class Component(Component):
             width=w, height=h,
             chunkSize=self.chunkSize,
             frameRate=int(self.settings.value("outputFrameRate")),
-            parent=self.parent, component=self,
+            parent=self.parent, component=self, debug=True,
         )
 
     def frameRender(self, frameNo):
@@ -102,20 +102,25 @@ class Component(Component):
         closePipe(self.video.pipe)
 
     def getPreviewFrame(self, width, height):
-        inputFile = self.parent.window.lineEdit_audioFile.text()
-        if not inputFile or not os.path.exists(inputFile):
-            return
-        duration = getAudioDuration(inputFile)
-        if not duration:
-            return
-        startPt = duration / 3
+        genericPreview = self.settings.value("pref_genericPreview")
+        startPt = 0
+        if not genericPreview:
+            inputFile = self.parent.window.lineEdit_audioFile.text()
+            if not inputFile or not os.path.exists(inputFile):
+                return
+            duration = getAudioDuration(inputFile)
+            if not duration:
+                return
+            startPt = duration / 3
 
         command = [
             self.core.FFMPEG_BIN,
             '-thread_queue_size', '512',
             '-r', self.settings.value("outputFrameRate"),
             '-ss', "{0:.3f}".format(startPt),
-            '-i', inputFile,
+            '-i',
+            os.path.join(self.core.wd, 'background.png')
+            if genericPreview else inputFile,
             '-f', 'image2pipe',
             '-pix_fmt', 'rgba',
         ]
@@ -148,13 +153,19 @@ class Component(Component):
             amplitude = 'cbrt'
         hexcolor = QColor(*self.color).name()
         opacity = "{0:.1f}".format(self.opacity / 100)
+        genericPreview = self.settings.value("pref_genericPreview")
 
         return [
             '-filter_complex',
-            '[0:a] %s%s'
+            '%s%s%s'
             'showwaves=r=30:s=%sx%s:mode=%s:colors=%s@%s:scale=%s%s%s [v1]; '
-            '[v1] scale=%s:%s%s [v]' % (
-                'compand=gain=2,' if self.compress else '',
+            '[v1] scale=%s:%s%s,setpts=2.0*PTS [v]' % (
+                'aevalsrc=sin(1*2*PI*t)*sin(880*2*PI*t),'
+                if preview and genericPreview else '[0:a] ',
+                'compand=.3|.3:1|1:-90/-60|-60/-40|-40/-30|-20/-20:6:0:-90:0.2'
+                ',' if self.compress and not preview else (
+                    'compand=gain=5,' if self.compress else ''
+                ),
                 'aformat=channel_layouts=mono,' if self.mono else '',
                 self.settings.value("outputWidth"),
                 self.settings.value("outputHeight"),
@@ -165,7 +176,8 @@ class Component(Component):
                 ) if self.mode < 2 else '',
                 ', hflip' if self.mirror else'',
                 w, h,
-                ', trim=duration=%s' % "{0:.3f}".format(startPt + 1) if preview else '',
+                ', trim=duration=%s' % "{0:.3f}".format(startPt + 1)
+                if preview else '',
             ),
             '-map', '[v]',
         ]

src/core.py

@@ -506,6 +506,7 @@ class Core:
             "outputContainer": "MP4",
             "projectDir": os.path.join(cls.dataDir, 'projects'),
             "pref_insertCompAtTop": True,
+            "pref_genericPreview": True,
         }
 
         for parm, value in defaultSettings.items():

src/mainwindow.py

@@ -791,6 +791,8 @@ class MainWindow(QtWidgets.QMainWindow):
             field.blockSignals(True)
             field.setText('')
             field.blockSignals(False)
+        self.progressBarUpdated(0)
+        self.progressBarSetText('')
 
     @disableWhenEncoding
     def createNewProject(self, prompt=True):

src/toolkit/ffmpeg.py

@@ -37,6 +37,7 @@ class FfmpegVideo:
         self.frameNo = -1
         self.currentFrame = 'None'
         self.map_ = None
+        self.debug = False
 
         if 'loopVideo' in kwargs and kwargs['loopVideo']:
             self.loopValue = '-1'
@@ -47,6 +48,8 @@ class FfmpegVideo:
                 kwargs['filter_'].insert(0, '-filter_complex')
         else:
             kwargs['filter_'] = None
+        if 'debug' in kwargs:
+            self.debug = True
 
         self.command = [
             core.Core.FFMPEG_BIN,
@@ -62,7 +65,6 @@ class FfmpegVideo:
                 kwargs['filter_']
             )
         self.command.extend([
-            '-s:v', '%sx%s' % (self.width, self.height),
             '-codec:v', 'rawvideo', '-',
         ])
 
@@ -88,11 +90,15 @@ class FfmpegVideo:
             self.frameBuffer.task_done()
 
     def fillBuffer(self):
-        import sys
-        print(self.command)
+        if self.debug:
+            print(" ".join([word for word in self.command]))
+            err = sys.__stdout__
+        else:
+            err = subprocess.DEVNULL
+
         self.pipe = openPipe(
             self.command, stdin=subprocess.DEVNULL, stdout=subprocess.PIPE,
-            stderr=sys.__stdout__, bufsize=10**8
+            stderr=err, bufsize=10**8
         )
         while True:
             if self.parent.canceled: