camera start_recording() to process.stdout crashes on stop_recording() about picamera

[waveform80]

Okay, I can reproduce this; I'm not sure what the underlying error is yet but the lack of PiCameraError is definitely a bug which was introduced when I factored the encoder classes out into their own unit. Should be fixed shortly and it'll be included in 0.8. Many thanks for the well written bug report!

[waveform80]

Ah, looks like I'd already got this on the issue list as #28 - anyway, I should be pushing a fix shortly

[Redsandro]

Pushing a fix for both problems, or just the "PiCameraError not defined" one?
I'm trying to be clever and pipe the H264 output to some process. :)

[waveform80]

The fix is specifically for the missing PiCameraError. I can't reproduce the specific error of piping the output to another process; this is the code I used to test the process, which worked successfully (in as much as it wrote 5 seconds worth of video recording to a file, via a cat process):

#!/usr/bin/env python

import io
import time
import picamera
from subprocess import Popen, PIPE

with picamera.PiCamera() as camera:
    with io.open('foo.h264', 'wb') as output_file:
        process = Popen(['cat', '-'], stdin=PIPE, stdout=output_file)
        camera.start_preview()
        time.sleep(2)
        camera.start_recording(process.stdin, format='h264')
        camera.wait_recording(5)
        camera.stop_recording()
        process.communicate()

[waveform80]

Though, now I look at your example and my code it does occur to me that you will have to specify the format manually (the format='h264' bit in my code) - otherwise the start_recording method won't know how to configure the encoder. Admittedly at the moment, the only valid option is h264 but that's probably going to change in the near future to support MJPG streams.

[Redsandro]

Ill send my code to reproduce soon

On Dec 7, 2013 11:06 PM, "Dave Jones" [email protected] wrote:

Though, now I look at your example and my code it does occur to me that
you will have to specify the format manually (the format='h264' bit in my
code) - otherwise the start_recording method won't know how to configure
the encoder. Admittedly at the moment, the only valid option is h264 but
that's probably going to change in the near future to support MJPG streams.

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