[gnome-getting-started-docs] refactor render scripts slightly

[Jakub Steiner <jimmac src gnome org>]

commit 842b99fa45b8f6dfdc8902447a3cef5057c65686
Author: Jakub Steiner <jimmac gmail com>
Date:   Mon May 6 15:27:11 2013 +0200

    refactor render scripts slightly
    
    - use a common module
    - temporarily use ffmpeg before gstreamer gets fixed

 animation/gnome-change-wallpaper.py       |   44 ++---------------------------
 animation/gnome-launching-applications.py |   44 ++---------------------------
 animation/gnome-responding-to-messages.py |   44 ++---------------------------
 animation/gnome-task-switching.py         |   44 ++---------------------------
 animation/gnome-timezone.py               |   44 ++---------------------------
 animation/gnome-windows-and-workspaces.py |   44 ++---------------------------
 animation/gnome-yelp-intro.py             |   43 ++--------------------------
 animation/gnomerender.py                  |   41 +++++++++++++++++++++++++++
 8 files changed, 62 insertions(+), 286 deletions(-)
---
diff --git a/animation/gnome-change-wallpaper.py b/animation/gnome-change-wallpaper.py
index db0f5c5..b450bcb 100644
--- a/animation/gnome-change-wallpaper.py
+++ b/animation/gnome-change-wallpaper.py
@@ -1,44 +1,6 @@
-import bpy,os,re
+import bpy,os,re,gnomerender
 from xml.etree import ElementTree as ET
 
- 
-def render(lang):
-  global renderpath,renderpathabs,sndfile
-  
-  #bpy.context.scene.render.resolution_percentage =
-  #bpy.context.scene.render.use_compositing = 0
-  bpy.context.scene.render.use_sequencer = 1
-  renderpath = '//sequence/'+lang
-  
-  regexobj = re.search(r"^(.*\/)*(.*)(\.blend)$", bpy.data.filepath)
-  bpy.context.scene.render.filepath = "%s/%s/" % (renderpath,regexobj.group(2))
-  renderpathabs = "%ssequence/%s/%s" % (regexobj.group(1),lang,regexobj.group(2))
-  sndpath = "%s/snd" % (renderpathabs)
-  sndfile = "%s/snd.flac" % (sndpath)
-  if (not os.path.isdir(renderpathabs)):
-    bpy.ops.render.render(animation=True)
-  if (not os.path.isdir(sndpath)):
-    os.mkdir(sndpath)
-    bpy.ops.sound.mixdown(filepath=sndfile)
-  else:
-    print('already rendered',bpy.context.scene.render.frame_path())
-
-def transcode(lang):
-  global renderpath,renderpathabs,sndfile
-
-  regexobj = re.search(r"^(.*\/)*(.*)(\.blend)$", bpy.data.filepath)
-  framepath = renderpathabs
-  webmfile = "%s.webm" % (regexobj.group(2))
-  transcodepath = "../gnome-help/%s/figures/" % (lang)
-  
-  #print(transcodepath,webmfile,sndfile,framepath)
-  transcodecmd = "gst-launch-1.0 webmmux name=mux ! filesink location=\"%s/%s\"    file://%s ! decodebin ! 
audioconvert ! vorbisenc bitrate=96000 ! mux.     multifilesrc location=\"%s/%%04d.png\" index=1 
caps=\"image/png,framerate=\(fraction\)24/1\" ! pngdec ! videoconvert ! videoscale ! video/x-raw, 
width=854,height=480 ! videorate ! vp8enc threads=12 target-bitrate=200000 ! mux." % 
(transcodepath,webmfile,sndfile,framepath)
-  if (not os.path.isfile(transcodepath+webmfile)):
-    os.system(transcodecmd)
-  else:
-    print('already transcoded',transcodepath + webmfile)  
-  
-#translates strings and calls render
 def main():
   
   t = {}
@@ -54,8 +16,8 @@ def main():
       if textobj.get('id') in bpy.data.objects: #prelozit jestli existuje jako index
         bpy.data.objects[textobj.get('id')].data.body = textobj.text
     bpy.data.objects['usermenuuser'].data.body = bpy.data.objects['user'].data.body #due to different 
alignment
-    render(lang)
-    transcode(lang)
+    gnomerender.render(lang)
+    gnomerender.transcode(lang)
     
 if __name__ == '__main__':
     main()
diff --git a/animation/gnome-launching-applications.py b/animation/gnome-launching-applications.py
index 4f88855..2202e37 100644
--- a/animation/gnome-launching-applications.py
+++ b/animation/gnome-launching-applications.py
@@ -1,44 +1,6 @@
-import bpy,os,re
+import bpy,os,re,gnomerender
 from xml.etree import ElementTree as ET
 
-def render(lang):
-  global renderpath,renderpathabs,sndfile
-  
-  #bpy.context.scene.render.resolution_percentage =
-  #bpy.context.scene.render.use_compositing = 0
-  bpy.context.scene.render.use_sequencer = 1
-  renderpath = '//sequence/'+lang
-  
-  regexobj = re.search(r"^(.*\/)*(.*)(\.blend)$", bpy.data.filepath)
-  bpy.context.scene.render.filepath = "%s/%s/" % (renderpath,regexobj.group(2))
-  renderpathabs = "%ssequence/%s/%s" % (regexobj.group(1),lang,regexobj.group(2))
-  sndpath = "%s/snd" % (renderpathabs)
-  sndfile = "%s/snd.flac" % (sndpath)
-  if (not os.path.isdir(renderpathabs)):
-    bpy.ops.render.render(animation=True)
-  if (not os.path.isdir(sndpath)):
-    os.mkdir(sndpath)
-    bpy.ops.sound.mixdown(filepath=sndfile)
-  else:
-    print('already rendered',bpy.context.scene.render.frame_path())
-
-def transcode(lang):
-  global renderpath,renderpathabs,sndfile
-
-  regexobj = re.search(r"^(.*\/)*(.*)(\.blend)$", bpy.data.filepath)
-  framepath = renderpathabs
-  webmfile = "%s.webm" % (regexobj.group(2))
-  transcodepath = "../gnome-help/%s/figures/" % (lang)
-  
-  #print(transcodepath,webmfile,sndfile,framepath)
-  transcodecmd = "gst-launch-1.0 webmmux name=mux ! filesink location=\"%s/%s\"    file://%s ! decodebin ! 
audioconvert ! vorbisenc bitrate=96000 ! mux.     multifilesrc location=\"%s/%%04d.png\" index=1 
caps=\"image/png,framerate=\(fraction\)24/1\" ! pngdec ! videoconvert ! videoscale ! video/x-raw, 
width=854,height=480 ! videorate ! vp8enc threads=12 target-bitrate=200000 ! mux." % 
(transcodepath,webmfile,sndfile,framepath)
-  if (not os.path.isfile(transcodepath+webmfile)):
-    os.system(transcodecmd)
-  else:
-    print('already transcoded',transcodepath + webmfile)
-
-  
-#translates strings and calls render
 def main():
   global typewrite
   
@@ -54,8 +16,8 @@ def main():
       if textobj.get('id') in bpy.data.objects: #prelozit jestli existuje jako index
         bpy.data.objects[textobj.get('id')].data.body = textobj.text
     bpy.data.objects['typewriter'].data.body = t[lang].find('t[ id="search"]').text
-    render(lang)
-    transcode(lang)
+    gnomerender.render(lang)
+    gnomerender.transcode(lang)
     
 if __name__ == '__main__':
     main()
diff --git a/animation/gnome-responding-to-messages.py b/animation/gnome-responding-to-messages.py
index 53287bb..cccc77f 100644
--- a/animation/gnome-responding-to-messages.py
+++ b/animation/gnome-responding-to-messages.py
@@ -1,44 +1,6 @@
-import bpy,os,re
+import bpy,os,re,gnomerender
 from xml.etree import ElementTree as ET
 
-def render(lang):
-  global renderpath,renderpathabs,sndfile
-  
-  #bpy.context.scene.render.resolution_percentage =
-  #bpy.context.scene.render.use_compositing = 0
-  bpy.context.scene.render.use_sequencer = 1
-  renderpath = '//sequence/'+lang
-  
-  regexobj = re.search(r"^(.*\/)*(.*)(\.blend)$", bpy.data.filepath)
-  bpy.context.scene.render.filepath = "%s/%s/" % (renderpath,regexobj.group(2))
-  renderpathabs = "%ssequence/%s/%s" % (regexobj.group(1),lang,regexobj.group(2))
-  sndpath = "%s/snd" % (renderpathabs)
-  sndfile = "%s/snd.flac" % (sndpath)
-  if (not os.path.isdir(renderpathabs)):
-    bpy.ops.render.render(animation=True)
-  if (not os.path.isdir(sndpath)):
-    os.mkdir(sndpath)
-    bpy.ops.sound.mixdown(filepath=sndfile)
-  else:
-    print('already rendered',bpy.context.scene.render.frame_path())
-
-def transcode(lang):
-  global renderpath,renderpathabs,sndfile
-
-  regexobj = re.search(r"^(.*\/)*(.*)(\.blend)$", bpy.data.filepath)
-  framepath = renderpathabs
-  webmfile = "%s.webm" % (regexobj.group(2))
-  transcodepath = "../gnome-help/%s/figures/" % (lang)
-  
-  #print(transcodepath,webmfile,sndfile,framepath)
-  transcodecmd = "gst-launch-1.0 webmmux name=mux ! filesink location=\"%s/%s\"    file://%s ! decodebin ! 
audioconvert ! vorbisenc bitrate=96000 ! mux.     multifilesrc location=\"%s/%%04d.png\" index=1 
caps=\"image/png,framerate=\(fraction\)24/1\" ! pngdec ! videoconvert ! videoscale ! video/x-raw, 
width=854,height=480 ! videorate ! vp8enc threads=12 target-bitrate=200000 ! mux." % 
(transcodepath,webmfile,sndfile,framepath)
-  if (not os.path.isfile(transcodepath+webmfile)):
-    os.system(transcodecmd)
-  else:
-    print('already transcoded',transcodepath + webmfile)
-
-      
-#translates strings and calls render
 def main():
   
   t = {}
@@ -55,8 +17,8 @@ def main():
     bpy.data.objects['typewriter2'].data.body = t[lang].find('t[ id="bubble.response2"]').text
     bpy.data.objects['typewriter3'].data.body = t[lang].find('t[ id="bubble.response3"]').text
     bpy.data.objects['user.mt.bubble'].data.body = bpy.data.objects['user'].data.body #needs to be left 
aligned :/
-    render(lang)
-    transcode(lang)
+    gnomerender.render(lang)
+    gnomerender.transcode(lang)
     
 if __name__ == '__main__':
     main()
diff --git a/animation/gnome-task-switching.py b/animation/gnome-task-switching.py
index a7ddb0d..05f2fcb 100644
--- a/animation/gnome-task-switching.py
+++ b/animation/gnome-task-switching.py
@@ -1,44 +1,6 @@
-import bpy,os,re
+import bpy,os,re,gnomerender
 from xml.etree import ElementTree as ET
 
-def render(lang):
-  global renderpath,renderpathabs,sndfile
-  
-  #bpy.context.scene.render.resolution_percentage =
-  #bpy.context.scene.render.use_compositing = 0
-  bpy.context.scene.render.use_sequencer = 1
-  renderpath = '//sequence/'+lang
-  
-  regexobj = re.search(r"^(.*\/)*(.*)(\.blend)$", bpy.data.filepath)
-  bpy.context.scene.render.filepath = "%s/%s/" % (renderpath,regexobj.group(2))
-  renderpathabs = "%ssequence/%s/%s" % (regexobj.group(1),lang,regexobj.group(2))
-  sndpath = "%s/snd" % (renderpathabs)
-  sndfile = "%s/snd.flac" % (sndpath)
-  if (not os.path.isdir(renderpathabs)):
-    bpy.ops.render.render(animation=True)
-  if (not os.path.isdir(sndpath)):
-    os.mkdir(sndpath)
-    bpy.ops.sound.mixdown(filepath=sndfile)
-  else:
-    print('already rendered',bpy.context.scene.render.frame_path())
-
-def transcode(lang):
-  global renderpath,renderpathabs,sndfile
-
-  regexobj = re.search(r"^(.*\/)*(.*)(\.blend)$", bpy.data.filepath)
-  framepath = renderpathabs
-  webmfile = "%s.webm" % (regexobj.group(2))
-  transcodepath = "../gnome-help/%s/figures/" % (lang)
-  
-  #print(transcodepath,webmfile,sndfile,framepath)
-  transcodecmd = "gst-launch-1.0 webmmux name=mux ! filesink location=\"%s/%s\"    file://%s ! decodebin ! 
audioconvert ! vorbisenc bitrate=96000 ! mux.     multifilesrc location=\"%s/%%04d.png\" index=1 
caps=\"image/png,framerate=\(fraction\)24/1\" ! pngdec ! videoconvert ! videoscale ! video/x-raw, 
width=854,height=480 ! videorate ! vp8enc threads=12 target-bitrate=200000 ! mux." % 
(transcodepath,webmfile,sndfile,framepath)
-  if (not os.path.isfile(transcodepath+webmfile)):
-    os.system(transcodecmd)
-  else:
-    print('already transcoded',transcodepath + webmfile)
-
-
-#translates strings and calls render
 def main():
   
   t = {}
@@ -52,8 +14,8 @@ def main():
       if textobj.get('id') in bpy.data.objects: #prelozit jestli existuje jako index
         bpy.data.objects[textobj.get('id')].data.body = textobj.text
     bpy.data.objects['typewriter'].data.body = t[lang].find('t[ id="search2"]').text
-    render(lang)
-    transcode(lang)
+    gnomerender.render(lang)
+    gnomerender.transcode(lang)
     
 if __name__ == '__main__':
     main()
diff --git a/animation/gnome-timezone.py b/animation/gnome-timezone.py
index 2a18771..06a53eb 100644
--- a/animation/gnome-timezone.py
+++ b/animation/gnome-timezone.py
@@ -1,44 +1,6 @@
-import bpy,os,re
+import bpy,os,re,gnomerender
 from xml.etree import ElementTree as ET
-
  
-def render(lang):
-  global renderpath,renderpathabs,sndfile
-  
-  #bpy.context.scene.render.resolution_percentage =
-  #bpy.context.scene.render.use_compositing = 0
-  bpy.context.scene.render.use_sequencer = 1
-  renderpath = '//sequence/'+lang
-  
-  regexobj = re.search(r"^(.*\/)*(.*)(\.blend)$", bpy.data.filepath)
-  bpy.context.scene.render.filepath = "%s/%s/" % (renderpath,regexobj.group(2))
-  renderpathabs = "%ssequence/%s/%s" % (regexobj.group(1),lang,regexobj.group(2))
-  sndpath = "%s/snd" % (renderpathabs)
-  sndfile = "%s/snd.flac" % (sndpath)
-  if (not os.path.isdir(renderpathabs)):
-    bpy.ops.render.render(animation=True)
-  if (not os.path.isdir(sndpath)):
-    os.mkdir(sndpath)
-    bpy.ops.sound.mixdown(filepath=sndfile)
-  else:
-    print('already rendered',bpy.context.scene.render.frame_path())
-
-def transcode(lang):
-  global renderpath,renderpathabs,sndfile
-
-  regexobj = re.search(r"^(.*\/)*(.*)(\.blend)$", bpy.data.filepath)
-  framepath = renderpathabs
-  webmfile = "%s.webm" % (regexobj.group(2))
-  transcodepath = "../gnome-help/%s/figures/" % (lang)
-  
-  #print(transcodepath,webmfile,sndfile,framepath)
-  transcodecmd = "gst-launch-1.0 webmmux name=mux ! filesink location=\"%s/%s\"    file://%s ! decodebin ! 
audioconvert ! vorbisenc bitrate=96000 ! mux.     multifilesrc location=\"%s/%%04d.png\" index=1 
caps=\"image/png,framerate=\(fraction\)24/1\" ! pngdec ! videoconvert ! videoscale ! video/x-raw, 
width=854,height=480 ! videorate ! vp8enc threads=12 target-bitrate=200000 ! mux." % 
(transcodepath,webmfile,sndfile,framepath)
-  if (not os.path.isfile(transcodepath+webmfile)):
-    os.system(transcodecmd)
-  else:
-    print('already transcoded',transcodepath + webmfile)  
-  
-#translates strings and calls render
 def main():
   
   t = {}
@@ -53,8 +15,8 @@ def main():
     for textobj in t[lang].findall('t'):
       if textobj.get('id') in bpy.data.objects: #prelozit jestli existuje jako index
         bpy.data.objects[textobj.get('id')].data.body = textobj.text
-    render(lang)
-    transcode(lang)
+    gnomerender.render(lang)
+    gnomerender.transcode(lang)
     
 if __name__ == '__main__':
     main()
diff --git a/animation/gnome-windows-and-workspaces.py b/animation/gnome-windows-and-workspaces.py
index 2395691..235a221 100644
--- a/animation/gnome-windows-and-workspaces.py
+++ b/animation/gnome-windows-and-workspaces.py
@@ -1,44 +1,6 @@
-import bpy,os,re
+import bpy,os,re,gnomerender
 from xml.etree import ElementTree as ET
 
-def render(lang):
-  global renderpath,renderpathabs,sndfile
-  
-  #bpy.context.scene.render.resolution_percentage =
-  #bpy.context.scene.render.use_compositing = 0
-  bpy.context.scene.render.use_sequencer = 1
-  renderpath = '//sequence/'+lang
-  
-  regexobj = re.search(r"^(.*\/)*(.*)(\.blend)$", bpy.data.filepath)
-  bpy.context.scene.render.filepath = "%s/%s/" % (renderpath,regexobj.group(2))
-  renderpathabs = "%ssequence/%s/%s" % (regexobj.group(1),lang,regexobj.group(2))
-  sndpath = "%s/snd" % (renderpathabs)
-  sndfile = "%s/snd.flac" % (sndpath)
-  #bpy.ops.render.render(animation=True)
-  if (not os.path.isdir(renderpathabs)):
-    bpy.ops.render.render(animation=True)
-  if (not os.path.isdir(sndpath)):
-    os.mkdir(sndpath)
-    bpy.ops.sound.mixdown(filepath=sndfile)
-  else:
-    print('already rendered',renderpathabs)
-
-def transcode(lang):
-  global renderpath,renderpathabs,sndfile
-
-  regexobj = re.search(r"^(.*\/)*(.*)(\.blend)$", bpy.data.filepath)
-  framepath = renderpathabs
-  webmfile = "%s.webm" % (regexobj.group(2))
-  transcodepath = "../gnome-help/%s/figures/" % (lang)
-  
-  #print(transcodepath,webmfile,sndfile,framepath)
-  transcodecmd = "gst-launch-1.0 webmmux name=mux ! filesink location=\"%s/%s\"    file://%s ! decodebin ! 
audioconvert ! vorbisenc bitrate=96000 ! mux.     multifilesrc location=\"%s/%%04d.png\" index=1 
caps=\"image/png,framerate=\(fraction\)24/1\" ! pngdec ! videoconvert ! videoscale ! video/x-raw, 
width=854,height=480 ! videorate ! vp8enc threads=12 target-bitrate=200000 ! mux." % 
(transcodepath,webmfile,sndfile,framepath)
-  if (not os.path.isfile(transcodepath+webmfile)):
-    os.system(transcodecmd)
-  else:
-    print('already transcoded',transcodepath + webmfile)  
-
-
 #translates strings and calls render
 def main():
   global typewrite
@@ -53,8 +15,8 @@ def main():
     for textobj in t[lang].findall('t'):
       if textobj.get('id') in bpy.data.objects: #prelozit jestli existuje jako index
         bpy.data.objects[textobj.get('id')].data.body = textobj.text
-    render(lang)
-    transcode(lang)
+    gnomerender.render(lang)
+    gnomerender.transcode(lang)
     
 if __name__ == '__main__':
     main()
diff --git a/animation/gnome-yelp-intro.py b/animation/gnome-yelp-intro.py
index 6e8e7a3..abfc9e8 100644
--- a/animation/gnome-yelp-intro.py
+++ b/animation/gnome-yelp-intro.py
@@ -1,43 +1,6 @@
-import bpy,os,re
+import bpy,os,re,gnomerender
 from xml.etree import ElementTree as ET
 
-def render(lang):
-  global renderpath,renderpathabs,sndfile
-  
-  #bpy.context.scene.render.resolution_percentage =
-  #bpy.context.scene.render.use_compositing = 0
-  bpy.context.scene.render.use_sequencer = 1
-  renderpath = '//sequence/'+lang
-  
-  regexobj = re.search(r"^(.*\/)*(.*)(\.blend)$", bpy.data.filepath)
-  bpy.context.scene.render.filepath = "%s/%s/" % (renderpath,regexobj.group(2))
-  renderpathabs = "%ssequence/%s/%s" % (regexobj.group(1),lang,regexobj.group(2))
-  sndpath = "%s/snd" % (renderpathabs)
-  sndfile = "%s/snd.flac" % (sndpath)
-  if (not os.path.isdir(renderpathabs)):
-    bpy.ops.render.render(animation=True)
-  if (not os.path.isdir(sndpath)):
-    os.mkdir(sndpath)
-    bpy.ops.sound.mixdown(filepath=sndfile)
-  else:
-    print('already rendered',bpy.context.scene.render.frame_path())
-
-def transcode(lang):
-  global renderpath,renderpathabs,sndfile
-
-  regexobj = re.search(r"^(.*\/)*(.*)(\.blend)$", bpy.data.filepath)
-  framepath = renderpathabs
-  webmfile = "%s.webm" % (regexobj.group(2))
-  transcodepath = "../gnome-help/%s/figures/" % (lang)
-  
-  #print(transcodepath,webmfile,sndfile,framepath)
-  transcodecmd = "gst-launch-1.0 webmmux name=mux ! filesink location=\"%s/%s\"    file://%s ! decodebin ! 
audioconvert ! vorbisenc bitrate=128000 ! mux.     multifilesrc location=\"%s/%%04d.png\" index=1 
caps=\"image/png,framerate=\(fraction\)24/1\" ! pngdec ! videoconvert ! videoscale ! videorate ! vp8enc 
threads=12 ! mux." % (transcodepath,webmfile,sndfile,framepath)
-  if (not os.path.isfile(transcodepath+webmfile)):
-    os.system(transcodecmd)
-  else:
-    print('already transcoded',transcodepath + webmfile)          
-
-#translates strings and calls render
 def main():
   
   t = {}
@@ -51,8 +14,8 @@ def main():
       if textobj.get('id') in bpy.data.objects: #prelozit jestli existuje jako index
         bpy.data.objects[textobj.get('id')].data.body = textobj.text
     bpy.data.objects['typewriter'].data.body = t[lang].find('t[ id="search"]').text
-    render(lang)
-    transcode(lang)
+    gnomerender.render(lang)
+    gnomerender.transcode(lang)
 
 if __name__ == '__main__':
     main()
diff --git a/animation/gnomerender.py b/animation/gnomerender.py
new file mode 100644
index 0000000..0701ac7
--- /dev/null
+++ b/animation/gnomerender.py
@@ -0,0 +1,41 @@
+import bpy,os,re
+
+def render(lang):
+  global renderpath,renderpathabs,sndfile
+  
+  #bpy.context.scene.render.resolution_percentage =
+  #bpy.context.scene.render.use_compositing = 0
+  bpy.context.scene.render.use_sequencer = 1
+  renderpath = '//sequence/'+lang
+  
+  regexobj = re.search(r"^(.*\/)*(.*)(\.blend)$", bpy.data.filepath)
+  bpy.context.scene.render.filepath = "%s/%s/" % (renderpath,regexobj.group(2))
+  renderpathabs = "%ssequence/%s/%s" % (regexobj.group(1),lang,regexobj.group(2))
+  sndpath = "%s/snd" % (renderpathabs)
+  sndfile = "%s/snd.flac" % (sndpath)
+  if (not os.path.isdir(renderpathabs)):
+    bpy.ops.render.render(animation=True)
+  if (not os.path.isdir(sndpath)):
+    os.mkdir(sndpath)
+    bpy.ops.sound.mixdown(filepath=sndfile)
+  else:
+    print('already rendered',bpy.context.scene.render.frame_path())
+
+def transcode(lang):
+  global renderpath,renderpathabs,sndfile
+
+  regexobj = re.search(r"^(.*\/)*(.*)(\.blend)$", bpy.data.filepath)
+  framepath = renderpathabs
+  webmfile = "%s.webm" % (regexobj.group(2))
+  transcodepath = "../gnome-help/%s/figures/" % (lang)
+  x = 854 #output width
+  y = round(x/(1280/720))
+  
+  #print(transcodepath,webmfile,sndfile,framepath)
+  transcodecmd = "ffmpeg -r 24 -f image2 -i %s/%%04d.png -i %s -vf scale=%s:%s -b 300k %s/%s" % 
(framepath,sndfile,x,y,transcodepath,webmfile)
+  #transcodecmd = "gst-launch-1.0 webmmux name=mux ! filesink location=\"%s/%s\"    file://%s ! decodebin ! 
audioconvert ! vorbisenc bitrate=96000 ! mux.     multifilesrc location=\"%s/%%04d.png\" index=1 
caps=\"image/png,framerate=\(fraction\)24/1\" ! pngdec ! videoconvert ! videoscale ! video/x-raw, 
width=%s,height=%s ! videorate ! vp8enc threads=12 target-bitrate=300000 ! mux." % 
(transcodepath,webmfile,sndfile,framepath,x,y)
+  if (not os.path.isfile(transcodepath+webmfile)):
+    os.system(transcodecmd)
+  else:
+    print('already transcoded',transcodepath + webmfile)
+