SOLVED!! aha!! :)
https://gist.github.com/RicardoViana/5190548
It seems that both ffmpeg and avconv use the StandardError instead
of standardOutput. So i used:
out = str(proc.readAllStandardError())
and it works like a charm. Next step is to figure a way to translate
this to a progress bar..
thank you very much for the help.
cheers
Ricardo Viana
On 03/18/2013 09:30 PM, Justin Israel wrote:
Whoops, you are starting your QProcess twice:
101: self.proc.start(command)
106: QtCore.QTimer.singleShot(100, partial(self.proc.start, command))
And also you aren't making use of that partial callback...
def dataReady(self, proc):
# make sure you are first converting the QByteArray
# to a string, and then stripping the string.
out = str(proc.readAllStandardOutput())
self.log.append(out.strip())
...
def export(self):
...
# probably dont need to save it as a member
# but pass it a parent
proc = QtCore.QProcess(self)
# connect signals first
proc.started.connect(self.started)
proc.readyReadStandardOutput.connect(partial(self.dataReady, proc))
proc.finished.connect(self.finished)
# start
proc.start(command)
On Tue, Mar 19, 2013 at 9:36 AM, Ricardo Viana <[email protected]
<mailto:[email protected]>> wrote:
Thanks. i m trying Qprocess now.
i can get the started and finished feedback. but nothing in
between... :(
i even changed from avconv to ffmpeg to see if its something w the
command.
maybe its something to do with the stdout from the command line
app!?!?
here is the latest.
https://gist.github.com/RicardoViana/5190548
On 03/18/2013 07:57 PM, Justin Israel wrote:
This works fine as a test, when I change these lines:
command = 'for i in {1..5}; do echo $i; sleep 1; done'
self.proc=subprocess.Popen(command, shell=True,
stdout=subprocess.PIPE)
Also, you can just connect the button right to the slot:
saveFile = QtGui.QPushButton('Export')
saveFile.clicked.connect(self.export)
Now here is a down side of the subprocess approach. What if the
application takes a while to print a line? That means your
application will still hang on that line, then process events,
then wait on another line. I still think you should explore the
QProcess approach.
On Mar 19, 2013, at 8:06 AM, Ricardo Viana wrote:
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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