Continuous capture not working about picamera

[waveform80]

Interesting - I don't get the exception at the end when I try it on my Pi, but I am able to replicate the issue with the filename generation under Python 2.

Under Python 3 it functions correctly, and it also functions correctly under Python 2 when the continuous() method is fed a unicode string, but when it's fed a bytes string it fails (because continuous() is explicity checking for str which I've aliased to unicode for compatibility with Python 2). So ... simple work-around on Python 2 for now is to make your filename template a unicode string:

for i, filename in enumerate(camera.continuous(u'image{counter:02d}.jpg')):
    print(filename)
    ...

For the next release, I'll make sure both unicode and bytes strings work with continuous() on Python 2. On Python 3 I should warn that bytes strings fed to the method will continue to fail as bytes doesn't support the format() method in Python 3 (it does in Python 2 though).

Many thanks for the well written bug report!

[mjmare]

That's quick ;-)

You're spot on. Changing the filename string to unicode fixes the problem. I'm using python 2.7.3 as you already guessed.

BTW how many fps do you get with continuous capture?

Thanks

Marcel

On 15 okt. 2013, at 22:22, Dave Jones [email protected] wrote:

Interesting - I don't get the exception at the end when I try it on my Pi, but I am able to replicate the issue with the filename generation under Python 2.

Under Python 3 it functions correctly, and it also functions correctly under Python 2 when the continuous() method is fed a unicode string, but when it's fed a bytes string it fails (because continuous() is explicity checking for str which I've aliased to unicode for compatibility with Python 2). So ... simple work-around on Python 2 for now is to make your filename template a unicode string:

for i, filename in enumerate(camera.continuous(u'image{counter:02d}.jpg')):
print(filename)
...

For the next release, I'll make sure both unicode and bytes strings work with continuous() on Python 2. On Python 3 I should warn that bytes strings fed to the method will continue to fail as bytes doesn't support the format() method in Python 3 (it does in Python 2 though).

Many thanks for the well written bug report!

—
Reply to this email directly or view it on GitHub.

[waveform80]

The fps seems to depend on several things including the resolution of the capture, the amount of ambient light, and even the overclocking of the Pi. The maximum I've managed so far is 4fps, but I'm hopeful of increasing this. There was a fascinating thread on the forums the other day where someone was experimenting with setting the video port of the camera to JPEG format (I had no idea this was possible!). I was hoping to have some time experiment with this at the weekend, but other things got in the way; it's logged as issue #2 though and I'm hoping to get some experiments with it done before the next release this weekend.

[waveform80]

I should add that's 4fps at 720p, and was without the preview running (running the preview definitely slows things down, but also prevents any frames coming back blank which does happen otherwise unless you're careful with pauses between captures).

[mjmare]

OK, I should get my hopes up then ;-)

Marcel

On 15 okt. 2013, at 23:03, Dave Jones [email protected] wrote:

The fps seems to depend on several things including the resolution of the capture, the amount of ambient light, and even the overclocking of the Pi. The maximum I've managed so far is 4fps, but I'm hopeful of increasing this. There was a fascinating thread on the forums the other day where someone was experimenting with setting the video port of the camera to JPEG format (I had no idea this was possible!). I was hoping to have some time experiment with this at the weekend, but other things got in the way; it's logged as issue #2 though and I'm hoping to get some experiments with it done before the next release this weekend.

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Reply to this email directly or view it on GitHub.