Thanks for the help man. Learning quite a lot of python just by joining
this group.
here is the link:
https://gist.github.com/RicardoViana/5189872
cheers
Ricardo Viana
On 03/18/2013 06:53 PM, Justin Israel wrote:
Can you post a full example on pastsbin or gist? It sounds like
something is happening before the event loop.
Also for subprocess, you should pass the command as a list so you
don't need shell=True
command=["avconv", "-i", self.inputFile, "-b",
self.bitRatesList[self.bitRate.currentIndex()], "-s",
self.sizeList[self.sizeSel.cur rentIndex()], self.outputFile]
Generally though, I think the QProcess approach is more robust as it
plays nicely with the event loop.
With the qtimer then reason I was using it plus a 100 ms timeout was
to have the callback placed into the event loop and run after the app
had fully started and signals would work. In a real case, the process
would probably get started by some action in your running app. Like a
button press or a response to some signal.
On Mar 18, 2013 11:00 PM, "Ricardo Viana" <[email protected]
<mailto:[email protected]>> wrote:
Thank you very much for the help Justin.
i followed your code on gist.
here is what i have now:
-----code----
def timer(self):
QtCore.QTimer.singleShot(100,self.export)
def export(self):
self.log.append("started")
self.proc=subprocess.Popen("avconv -i %s -b %s -s %s %s"
%(self.inputFile,self.bitRatesList[self.bitRate.currentIndex()],
self.sizeList[self.sizeSel.currentIndex()],self.outputFile),shell=True,stdout=subprocess.PIPE)
while True:
output=self.proc.stdout.readline()
if not output:
break
QtGui.qApp.processEvents()
self.log.append(output.strip())
-----code----
what is happening is the following. The self.log.append("started")
only shows when the subprocess terminates and it should be the
other way around. Also i can't append the output.strip to the
QTextBrowser(self.log) i have. it shows nicely on the terminal but
not in the GUI.
Another thing i can't figure is why i have to say to subprocess ->
Shell=True. In your code you don't have it. but if i run it that way
i get an error :
File "/usr/lib/python2.7/subprocess.py", line 1249, in _execute_child
raise child_exception
OSError: [Errno 2] No such file or directory
On 03/16/2013 03:29 AM, Justin Israel wrote:
QProcess has signals that indicate when new data is ready to
read from your process, allowing to to get line updates. Also,
in your example, you are going to be blocking the event loop
with your for loop.
I put together an example of each of those for you here:
https://gist.github.com/justinfx/5174795
The first example shows how to monitor the QProcess for new output
The second shows how to use subprocess in a way that you can
loop over the output, but still pump the event loop. If your
lines are being emitted quickly you probably don't need to
make the call for every loop, but rather you could call on on
every 10 lines...or 100 lines.. or whatever is appropriate to
give your main gui thread a chance to process the pending events:
i.e.
i = 0
while True:
line = process.stdout.readline()
if not line:
break
# process line
# process event loop every 10 lines
if i % 10 == 0:
QtGui.qApp.processEvents()
i +=1
-- justin
On Thursday, March 7, 2013 5:22:19 AM UTC+13, olheiros wrote:
Hi Fellas!
i'm trying to build my own video converter gui on a Linux.
Using Pyqt4.
I'm using avconv command line converter.
I have setup all parameters and it is working fine.
The thing is i would like to have some kind of progress
feedback.
Does anyone know how to retrieve the command line feedback so
i can hook it to some kind of expression to drive the
QProgressBar?
thank you very much
--
////////////////////////////////////
Ricardo Viana
VFX Generalist
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VFX Generalist
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