Repeated CAP: Device select() timeout #284
Description
I have an Arducam 5MP Camera and can't seem to get it streaming reliably under ustreamer.
Device details:
$ v4l2-ctl --list-devices
Arducam 5MP Camera Module: Ardu (usb-0000:c2:00.3-1.2):
/dev/video0
/dev/video1
/dev/media0
$ v4l2-ctl --list-formats-ext
ioctl: VIDIOC_ENUM_FMT
Type: Video Capture
[0]: 'MJPG' (Motion-JPEG, compressed)
Size: Discrete 640x480
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 640x360
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 800x600
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 1024x768
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 1280x720
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 1280x960
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 1600x1200
Interval: Discrete 0.067s (15.000 fps)
Size: Discrete 2048x1536
Interval: Discrete 0.067s (15.000 fps)
Size: Discrete 2592x1944
Interval: Discrete 0.067s (15.000 fps)
Size: Discrete 1920x1080
Interval: Discrete 0.033s (30.000 fps)
[1]: 'YUYV' (YUYV 4:2:2)
Size: Discrete 640x480
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 640x360
Interval: Discrete 0.033s (30.000 fps)
Size: Discrete 800x600
Interval: Discrete 0.050s (20.000 fps)
Size: Discrete 1024x768
Interval: Discrete 0.100s (10.000 fps)
Size: Discrete 1280x720
Interval: Discrete 0.100s (10.000 fps)
Size: Discrete 1280x960
Interval: Discrete 0.133s (7.500 fps)
Size: Discrete 1600x1200
Interval: Discrete 0.133s (7.500 fps)
Size: Discrete 2048x1536
Interval: Discrete 0.500s (2.000 fps)
Size: Discrete 2592x1944
Interval: Discrete 0.500s (2.000 fps)
Size: Discrete 1920x1080
Interval: Discrete 0.200s (5.000 fps)
I can get a consistent stream from it via vlc with the following command:
$ vlc v4l2:///dev/video0:chroma=MJPEG
When trying stream through ustreamer:
$ ./ustreamer
-- INFO [543179.118 ] -- Starting PiKVM uStreamer 6.12 ...
-- INFO [543179.118 ] -- HTTP: Listening HTTP on [127.0.0.1]:8080
-- INFO [543179.118 ] -- Using V4L2 device: /dev/video0
-- INFO [543179.118 ] -- HTTP: Starting eventloop ...
-- INFO [543179.118 ] -- CAP: Using capture type: single-planar
-- INFO [543179.118 ] -- CAP: Using input channel: 0
-- INFO [543179.147 ] -- CAP: Using resolution: 640x480
-- INFO [543179.147 ] -- CAP: Using format: YUYV
-- INFO [543179.178 ] -- CAP: Using HW FPS: 0 -> 30 (coerced)
-- INFO [543179.178 ] -- CAP: Using IO method: MMAP
-- INFO [543179.179 ] -- CAP: Requested 5 device buffers, got 5
-- INFO [543179.201 ] -- CAP: Capturing started
-- INFO [543179.201 ] -- Using JPEG quality: 80%
-- INFO [543179.201 ] -- Creating pool JPEG with 4 workers ...
-- INFO [543179.201 ] -- Capturing ...
-- ERROR [543182.238 ] -- CAP: Device select() timeout
-- INFO [543182.334 ] -- Destroying workers pool JPEG ...
-- INFO [543182.336 ] -- CAP: Capturing stopped
================================================================================
-- INFO [543182.336 ] -- Using V4L2 device: /dev/video0
-- INFO [543182.336 ] -- CAP: Using capture type: single-planar
-- INFO [543182.336 ] -- CAP: Using input channel: 0
-- INFO [543184.567 ] -- CAP: Using resolution: 640x480
-- INFO [543184.567 ] -- CAP: Using format: YUYV
-- INFO [543184.597 ] -- CAP: Using HW FPS: 0 -> 30 (coerced)
-- INFO [543184.597 ] -- CAP: Using IO method: MMAP
-- INFO [543184.597 ] -- CAP: Requested 5 device buffers, got 5
-- INFO [543184.608 ] -- CAP: Capturing started
-- INFO [543184.608 ] -- Using JPEG quality: 80%
-- INFO [543184.608 ] -- Creating pool JPEG with 4 workers ...
-- INFO [543184.609 ] -- Capturing ...
-- ERROR [543187.158 ] -- CAP: Device select() timeout
-- INFO [543187.258 ] -- Destroying workers pool JPEG ...
-- INFO [543187.264 ] -- CAP: Capturing stopped
================================================================================
-- INFO [543187.265 ] -- Using V4L2 device: /dev/video0
-- INFO [543187.265 ] -- CAP: Using capture type: single-planar
-- INFO [543187.265 ] -- CAP: Using input channel: 0
-- INFO [543189.492 ] -- CAP: Using resolution: 640x480
-- INFO [543189.492 ] -- CAP: Using format: YUYV
-- INFO [543189.524 ] -- CAP: Using HW FPS: 0 -> 30 (coerced)
-- INFO [543189.524 ] -- CAP: Using IO method: MMAP
-- INFO [543189.525 ] -- CAP: Requested 5 device buffers, got 5
-- INFO [543189.536 ] -- CAP: Capturing started
-- INFO [543189.536 ] -- Using JPEG quality: 80%
-- INFO [543189.536 ] -- Creating pool JPEG with 4 workers ...
-- INFO [543189.537 ] -- Capturing ...
-- ERROR [543193.609 ] -- CAP: Device select() timeout
-- INFO [543193.658 ] -- Destroying workers pool JPEG ...
-- INFO [543193.664 ] -- CAP: Capturing stopped
================================================================================
$ ./ustreamer --format MJPEG
-- INFO [543107.002 ] -- Starting PiKVM uStreamer 6.12 ...
-- INFO [543107.002 ] -- HTTP: Listening HTTP on [127.0.0.1]:8080
-- INFO [543107.002 ] -- Using V4L2 device: /dev/video0
-- INFO [543107.002 ] -- HTTP: Starting eventloop ...
-- INFO [543107.002 ] -- CAP: Using capture type: single-planar
-- INFO [543107.002 ] -- CAP: Using input channel: 0
-- INFO [543107.031 ] -- CAP: Using resolution: 640x480
-- INFO [543107.032 ] -- CAP: Using format: MJPEG
-- INFO [543107.062 ] -- CAP: Using HW FPS: 0 -> 30 (coerced)
-- ERROR [543107.063 ] -- CAP: Device doesn't support setting of HW encoding quality parameters
-- INFO [543107.063 ] -- CAP: Using IO method: MMAP
-- INFO [543107.063 ] -- CAP: Requested 5 device buffers, got 5
-- INFO [543107.072 ] -- CAP: Capturing started
-- INFO [543107.072 ] -- Switching to HW encoder: the input is (M)JPEG ...
-- INFO [543107.072 ] -- Using JPEG quality: encoder default
-- INFO [543107.072 ] -- Creating pool JPEG with 1 workers ...
-- INFO [543107.073 ] -- Capturing ...
-- ERROR [543112.690 ] -- CAP: Device select() timeout
-- INFO [543112.785 ] -- Destroying workers pool JPEG ...
-- INFO [543112.801 ] -- CAP: Capturing stopped
================================================================================
-- INFO [543112.801 ] -- Using V4L2 device: /dev/video0
-- INFO [543112.801 ] -- CAP: Using capture type: single-planar
-- INFO [543112.801 ] -- CAP: Using input channel: 0
-- INFO [543115.028 ] -- CAP: Using resolution: 640x480
-- INFO [543115.028 ] -- CAP: Using format: MJPEG
-- INFO [543115.059 ] -- CAP: Using HW FPS: 0 -> 30 (coerced)
-- ERROR [543115.059 ] -- CAP: Device doesn't support setting of HW encoding quality parameters
-- INFO [543115.059 ] -- CAP: Using IO method: MMAP
-- INFO [543115.060 ] -- CAP: Requested 5 device buffers, got 5
-- INFO [543115.072 ] -- CAP: Capturing started
-- INFO [543115.072 ] -- Switching to HW encoder: the input is (M)JPEG ...
-- INFO [543115.072 ] -- Using JPEG quality: encoder default
-- INFO [543115.072 ] -- Creating pool JPEG with 1 workers ...
-- INFO [543115.073 ] -- Capturing ...
-- ERROR [543117.526 ] -- CAP: Device select() timeout
-- INFO [543117.627 ] -- Destroying workers pool JPEG ...
-- INFO [543117.633 ] -- CAP: Capturing stopped
================================================================================
With --debug:
$ ./ustreamer --format MJPEG --debug
-- INFO [543231.634 ] -- Starting PiKVM uStreamer 6.12 ...
-- DEBUG [543231.634 ] -- Installing SIGINT handler ...
-- DEBUG [543231.634 ] -- Installing SIGTERM handler ...
-- DEBUG [543231.634 ] -- Ignoring SIGPIPE ...
-- DEBUG [543231.634 ] -- HTTP: Binding HTTP to [127.0.0.1]:8080 ...
-- INFO [543231.634 ] -- HTTP: Listening HTTP on [127.0.0.1]:8080
-- INFO [543231.634 ] -- HTTP: Starting eventloop ...
-- DEBUG [543231.634 ] -- CAP: Opening capture device ...
-- DEBUG [543231.634 ] -- CAP: Capture device fd=8 opened
-- INFO [543231.634 ] -- Using V4L2 device: /dev/video0
-- DEBUG [543231.634 ] -- CAP: Querying device capabilities ...
-- INFO [543231.634 ] -- CAP: Using capture type: single-planar
-- INFO [543231.634 ] -- CAP: Using input channel: 0
-- DEBUG [543231.635 ] -- CAP: Using TV standard: DEFAULT
-- DEBUG [543231.635 ] -- CAP: Probing device format=MJPEG, stride=1280, resolution=640x480 ...
-- DEBUG [543231.651 ] -- HTTP: Repeating exposed ...
-- INFO [543231.665 ] -- CAP: Using resolution: 640x480
-- INFO [543231.665 ] -- CAP: Using format: MJPEG
-- DEBUG [543231.665 ] -- CAP: Querying HW FPS ...
-- INFO [543231.696 ] -- CAP: Using HW FPS: 0 -> 30 (coerced)
-- ERROR [543231.696 ] -- CAP: Device doesn't support setting of HW encoding quality parameters
-- INFO [543231.696 ] -- CAP: Using IO method: MMAP
-- DEBUG [543231.696 ] -- CAP: Requesting 5 device buffers for MMAP ...
-- INFO [543231.697 ] -- CAP: Requested 5 device buffers, got 5
-- DEBUG [543231.697 ] -- CAP: Allocating device buffers ...
-- DEBUG [543231.697 ] -- CAP: Calling us_xioctl(VIDIOC_QUERYBUF) for device buffer=0 ...
-- DEBUG [543231.697 ] -- CAP: Mapping device buffer=0 ...
-- DEBUG [543231.697 ] -- CAP: Calling us_xioctl(VIDIOC_QUERYBUF) for device buffer=1 ...
-- DEBUG [543231.697 ] -- CAP: Mapping device buffer=1 ...
-- DEBUG [543231.697 ] -- CAP: Calling us_xioctl(VIDIOC_QUERYBUF) for device buffer=2 ...
-- DEBUG [543231.697 ] -- CAP: Mapping device buffer=2 ...
-- DEBUG [543231.697 ] -- CAP: Calling us_xioctl(VIDIOC_QUERYBUF) for device buffer=3 ...
-- DEBUG [543231.697 ] -- CAP: Mapping device buffer=3 ...
-- DEBUG [543231.697 ] -- CAP: Calling us_xioctl(VIDIOC_QUERYBUF) for device buffer=4 ...
-- DEBUG [543231.697 ] -- CAP: Mapping device buffer=4 ...
-- DEBUG [543231.697 ] -- CAP: Calling us_xioctl(VIDIOC_QBUF) for buffer=0 ...
-- DEBUG [543231.697 ] -- CAP: Calling us_xioctl(VIDIOC_QBUF) for buffer=1 ...
-- DEBUG [543231.697 ] -- CAP: Calling us_xioctl(VIDIOC_QBUF) for buffer=2 ...
-- DEBUG [543231.697 ] -- CAP: Calling us_xioctl(VIDIOC_QBUF) for buffer=3 ...
-- DEBUG [543231.697 ] -- CAP: Calling us_xioctl(VIDIOC_QBUF) for buffer=4 ...
-- INFO [543231.712 ] -- CAP: Capturing started
-- INFO [543231.712 ] -- Switching to HW encoder: the input is (M)JPEG ...
-- INFO [543231.712 ] -- Using JPEG quality: encoder default
-- INFO [543231.712 ] -- Creating pool JPEG with 1 workers ...
-- DEBUG [543231.712 ] -- Hello! I am a worker jw-0 ^_^
-- DEBUG [543231.712 ] -- Worker jw-0 waiting for a new job ...
-- INFO [543231.713 ] -- Capturing ...
-- DEBUG [543231.713 ] -- CAP: Calling select() on video device ...
-- DEBUG [543232.008 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543232.008 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543232.008 ] -- CAP: Grabbed HW buffer=1: bytesused=88528, grab_ts=543231.928, latency=0.080, skipped=0
-- PERF [543232.008 ] -- FPS: STREAM-CAPTURED: 0
-- DEBUG [543232.008 ] -- CAP: Calling select() on video device ...
-- VERB [543232.008 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543232.008 ] -- CAP: Releasing HW buffer=1 ...
-- DEBUG [543232.008 ] -- CAP: HW buffer=1 released
-- DEBUG [543232.660 ] -- HTTP: Repeating exposed ...
-- DEBUG [543232.913 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543232.913 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543232.913 ] -- CAP: Grabbed HW buffer=1: bytesused=88757, grab_ts=543232.828, latency=0.085, skipped=0
-- DEBUG [543232.913 ] -- CAP: Calling select() on video device ...
-- VERB [543232.913 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543232.918 ] -- CAP: Releasing HW buffer=1 ...
-- DEBUG [543232.918 ] -- CAP: HW buffer=1 released
-- DEBUG [543233.412 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543233.412 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543233.412 ] -- CAP: Grabbed HW buffer=1: bytesused=88611, grab_ts=543233.332, latency=0.080, skipped=0
-- PERF [543233.412 ] -- FPS: STREAM-CAPTURED: 2
-- VERB [543233.412 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543233.412 ] -- CAP: Releasing HW buffer=1 ...
-- DEBUG [543233.412 ] -- CAP: HW buffer=1 released
-- DEBUG [543233.412 ] -- CAP: Calling select() on video device ...
-- DEBUG [543233.669 ] -- HTTP: Repeating exposed ...
-- DEBUG [543233.712 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543233.712 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543233.712 ] -- CAP: Grabbed HW buffer=4: bytesused=88600, grab_ts=543233.632, latency=0.080, skipped=0
-- DEBUG [543233.712 ] -- CAP: Calling select() on video device ...
-- VERB [543233.712 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543233.717 ] -- CAP: Releasing HW buffer=4 ...
-- DEBUG [543233.718 ] -- CAP: HW buffer=4 released
-- DEBUG [543234.676 ] -- HTTP: Repeating exposed ...
-- DEBUG [543234.713 ] -- CAP: Device select() --> 0; has_read=0, has_error=0
-- ERROR [543234.713 ] -- CAP: Device select() timeout
-- INFO [543234.814 ] -- Destroying workers pool JPEG ...
-- DEBUG [543234.814 ] -- Bye-bye (worker jw-0)
-- DEBUG [543234.814 ] -- CAP: Calling VIDIOC_STREAMOFF ...
-- DEBUG [543234.816 ] -- CAP: Releasing HW buffers ...
-- INFO [543234.816 ] -- CAP: Capturing stopped
================================================================================
-- DEBUG [543234.817 ] -- CAP: Opening capture device ...
-- DEBUG [543234.817 ] -- CAP: Capture device fd=8 opened
-- INFO [543234.817 ] -- Using V4L2 device: /dev/video0
-- DEBUG [543234.817 ] -- CAP: Querying device capabilities ...
-- INFO [543234.817 ] -- CAP: Using capture type: single-planar
-- INFO [543234.817 ] -- CAP: Using input channel: 0
-- DEBUG [543234.817 ] -- CAP: Using TV standard: DEFAULT
-- DEBUG [543234.817 ] -- CAP: Probing device format=MJPEG, stride=1280, resolution=640x480 ...
-- DEBUG [543235.683 ] -- HTTP: Repeating exposed ...
-- DEBUG [543236.690 ] -- HTTP: Repeating exposed ...
-- INFO [543237.045 ] -- CAP: Using resolution: 640x480
-- INFO [543237.045 ] -- CAP: Using format: MJPEG
-- DEBUG [543237.045 ] -- CAP: Querying HW FPS ...
-- INFO [543237.077 ] -- CAP: Using HW FPS: 0 -> 30 (coerced)
-- ERROR [543237.077 ] -- CAP: Device doesn't support setting of HW encoding quality parameters
-- INFO [543237.077 ] -- CAP: Using IO method: MMAP
-- DEBUG [543237.077 ] -- CAP: Requesting 5 device buffers for MMAP ...
-- INFO [543237.077 ] -- CAP: Requested 5 device buffers, got 5
-- DEBUG [543237.077 ] -- CAP: Allocating device buffers ...
-- DEBUG [543237.077 ] -- CAP: Calling us_xioctl(VIDIOC_QUERYBUF) for device buffer=0 ...
-- DEBUG [543237.077 ] -- CAP: Mapping device buffer=0 ...
-- DEBUG [543237.078 ] -- CAP: Calling us_xioctl(VIDIOC_QUERYBUF) for device buffer=1 ...
-- DEBUG [543237.078 ] -- CAP: Mapping device buffer=1 ...
-- DEBUG [543237.078 ] -- CAP: Calling us_xioctl(VIDIOC_QUERYBUF) for device buffer=2 ...
-- DEBUG [543237.078 ] -- CAP: Mapping device buffer=2 ...
-- DEBUG [543237.078 ] -- CAP: Calling us_xioctl(VIDIOC_QUERYBUF) for device buffer=3 ...
-- DEBUG [543237.078 ] -- CAP: Mapping device buffer=3 ...
-- DEBUG [543237.078 ] -- CAP: Calling us_xioctl(VIDIOC_QUERYBUF) for device buffer=4 ...
-- DEBUG [543237.078 ] -- CAP: Mapping device buffer=4 ...
-- DEBUG [543237.078 ] -- CAP: Calling us_xioctl(VIDIOC_QBUF) for buffer=0 ...
-- DEBUG [543237.078 ] -- CAP: Calling us_xioctl(VIDIOC_QBUF) for buffer=1 ...
-- DEBUG [543237.078 ] -- CAP: Calling us_xioctl(VIDIOC_QBUF) for buffer=2 ...
-- DEBUG [543237.078 ] -- CAP: Calling us_xioctl(VIDIOC_QBUF) for buffer=3 ...
-- DEBUG [543237.078 ] -- CAP: Calling us_xioctl(VIDIOC_QBUF) for buffer=4 ...
-- INFO [543237.088 ] -- CAP: Capturing started
-- INFO [543237.088 ] -- Switching to HW encoder: the input is (M)JPEG ...
-- INFO [543237.088 ] -- Using JPEG quality: encoder default
-- INFO [543237.088 ] -- Creating pool JPEG with 1 workers ...
-- DEBUG [543237.088 ] -- Hello! I am a worker jw-0 ^_^
-- DEBUG [543237.088 ] -- Worker jw-0 waiting for a new job ...
-- INFO [543237.089 ] -- Capturing ...
-- DEBUG [543237.089 ] -- CAP: Calling select() on video device ...
-- DEBUG [543237.284 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543237.284 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543237.284 ] -- CAP: Grabbed HW buffer=0: bytesused=36950, grab_ts=543237.092, latency=0.192, skipped=0
-- PERF [543237.284 ] -- FPS: STREAM-CAPTURED: 2
-- DEBUG [543237.284 ] -- CAP: Calling select() on video device ...
-- VERB [543237.284 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543237.284 ] -- CAP: Releasing HW buffer=0 ...
-- DEBUG [543237.284 ] -- CAP: HW buffer=0 released
-- DEBUG [543237.332 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543237.332 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543237.332 ] -- CAP: Grabbed HW buffer=1: bytesused=88274, grab_ts=543237.284, latency=0.048, skipped=0
-- DEBUG [543237.332 ] -- CAP: Calling select() on video device ...
-- VERB [543237.332 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543237.332 ] -- CAP: Releasing HW buffer=1 ...
-- DEBUG [543237.332 ] -- CAP: HW buffer=1 released
-- DEBUG [543237.384 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543237.384 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543237.384 ] -- CAP: Grabbed HW buffer=2: bytesused=88422, grab_ts=543237.336, latency=0.048, skipped=0
-- DEBUG [543237.384 ] -- CAP: Calling select() on video device ...
-- VERB [543237.384 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543237.389 ] -- CAP: Releasing HW buffer=2 ...
-- DEBUG [543237.389 ] -- CAP: HW buffer=2 released
-- DEBUG [543237.436 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543237.436 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543237.436 ] -- CAP: Grabbed HW buffer=3: bytesused=88320, grab_ts=543237.384, latency=0.052, skipped=0
-- DEBUG [543237.436 ] -- CAP: Calling select() on video device ...
-- VERB [543237.436 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543237.436 ] -- CAP: Releasing HW buffer=3 ...
-- DEBUG [543237.436 ] -- CAP: HW buffer=3 released
-- DEBUG [543237.484 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543237.484 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543237.484 ] -- CAP: Grabbed HW buffer=4: bytesused=88388, grab_ts=543237.436, latency=0.048, skipped=0
-- DEBUG [543237.484 ] -- CAP: Calling select() on video device ...
-- VERB [543237.484 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543237.484 ] -- CAP: Releasing HW buffer=4 ...
-- DEBUG [543237.484 ] -- CAP: HW buffer=4 released
-- DEBUG [543237.536 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543237.536 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543237.536 ] -- CAP: Grabbed HW buffer=0: bytesused=88348, grab_ts=543237.484, latency=0.052, skipped=0
-- DEBUG [543237.536 ] -- CAP: Calling select() on video device ...
-- VERB [543237.536 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543237.536 ] -- CAP: Releasing HW buffer=0 ...
-- DEBUG [543237.536 ] -- CAP: HW buffer=0 released
-- DEBUG [543237.584 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543237.584 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543237.584 ] -- CAP: Grabbed HW buffer=1: bytesused=88317, grab_ts=543237.536, latency=0.048, skipped=0
-- DEBUG [543237.584 ] -- CAP: Calling select() on video device ...
-- VERB [543237.584 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543237.584 ] -- CAP: Releasing HW buffer=1 ...
-- DEBUG [543237.584 ] -- CAP: HW buffer=1 released
-- DEBUG [543237.636 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543237.636 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543237.636 ] -- CAP: Grabbed HW buffer=2: bytesused=88459, grab_ts=543237.584, latency=0.052, skipped=0
-- DEBUG [543237.636 ] -- CAP: Calling select() on video device ...
-- VERB [543237.636 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543237.641 ] -- CAP: Releasing HW buffer=2 ...
-- DEBUG [543237.641 ] -- CAP: HW buffer=2 released
-- DEBUG [543237.684 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543237.684 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543237.684 ] -- CAP: Grabbed HW buffer=3: bytesused=88308, grab_ts=543237.636, latency=0.048, skipped=0
-- DEBUG [543237.684 ] -- CAP: Calling select() on video device ...
-- VERB [543237.684 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543237.684 ] -- CAP: Releasing HW buffer=3 ...
-- DEBUG [543237.684 ] -- CAP: HW buffer=3 released
-- DEBUG [543237.700 ] -- HTTP: Repeating exposed ...
-- DEBUG [543237.736 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543237.736 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543237.736 ] -- CAP: Grabbed HW buffer=4: bytesused=88310, grab_ts=543237.684, latency=0.052, skipped=0
-- DEBUG [543237.736 ] -- CAP: Calling select() on video device ...
-- VERB [543237.736 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543237.736 ] -- CAP: Releasing HW buffer=4 ...
-- DEBUG [543237.736 ] -- CAP: HW buffer=4 released
-- DEBUG [543237.884 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543237.884 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543237.884 ] -- CAP: Grabbed HW buffer=1: bytesused=88393, grab_ts=543237.804, latency=0.080, skipped=0
-- DEBUG [543237.884 ] -- CAP: Calling select() on video device ...
-- VERB [543237.884 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543237.889 ] -- CAP: Releasing HW buffer=1 ...
-- DEBUG [543237.889 ] -- CAP: HW buffer=1 released
-- DEBUG [543237.936 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543237.936 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543237.936 ] -- CAP: Grabbed HW buffer=2: bytesused=88439, grab_ts=543237.884, latency=0.052, skipped=0
-- DEBUG [543237.936 ] -- CAP: Calling select() on video device ...
-- VERB [543237.936 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543237.936 ] -- CAP: Releasing HW buffer=2 ...
-- DEBUG [543237.936 ] -- CAP: HW buffer=2 released
-- DEBUG [543238.236 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543238.236 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543238.236 ] -- CAP: Grabbed HW buffer=0: bytesused=88323, grab_ts=543238.156, latency=0.080, skipped=0
-- PERF [543238.236 ] -- FPS: STREAM-CAPTURED: 12
-- DEBUG [543238.236 ] -- CAP: Calling select() on video device ...
-- VERB [543238.236 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543238.236 ] -- CAP: Releasing HW buffer=0 ...
-- DEBUG [543238.236 ] -- CAP: HW buffer=0 released
-- DEBUG [543238.436 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543238.436 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543238.436 ] -- CAP: Grabbed HW buffer=2: bytesused=88409, grab_ts=543238.268, latency=0.168, skipped=0
-- DEBUG [543238.436 ] -- CAP: Calling select() on video device ...
-- VERB [543238.436 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543238.441 ] -- CAP: Releasing HW buffer=2 ...
-- DEBUG [543238.441 ] -- CAP: HW buffer=2 released
-- DEBUG [543238.488 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543238.488 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543238.488 ] -- CAP: Grabbed HW buffer=3: bytesused=88401, grab_ts=543238.436, latency=0.052, skipped=0
-- DEBUG [543238.488 ] -- CAP: Calling select() on video device ...
-- VERB [543238.488 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543238.493 ] -- CAP: Releasing HW buffer=3 ...
-- DEBUG [543238.493 ] -- CAP: HW buffer=3 released
-- DEBUG [543238.536 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543238.536 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543238.536 ] -- CAP: Grabbed HW buffer=4: bytesused=88350, grab_ts=543238.488, latency=0.048, skipped=0
-- DEBUG [543238.536 ] -- CAP: Calling select() on video device ...
-- VERB [543238.536 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543238.536 ] -- CAP: Releasing HW buffer=4 ...
-- DEBUG [543238.536 ] -- CAP: HW buffer=4 released
-- DEBUG [543238.588 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543238.588 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543238.588 ] -- CAP: Grabbed HW buffer=0: bytesused=88387, grab_ts=543238.536, latency=0.052, skipped=0
-- DEBUG [543238.588 ] -- CAP: Calling select() on video device ...
-- VERB [543238.588 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543238.588 ] -- CAP: Releasing HW buffer=0 ...
-- DEBUG [543238.588 ] -- CAP: HW buffer=0 released
-- DEBUG [543238.706 ] -- HTTP: Repeating exposed ...
-- DEBUG [543239.340 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543239.340 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543239.340 ] -- CAP: Grabbed HW buffer=2: bytesused=88683, grab_ts=543239.260, latency=0.080, skipped=0
-- PERF [543239.340 ] -- FPS: STREAM-CAPTURED: 5
-- DEBUG [543239.340 ] -- CAP: Calling select() on video device ...
-- VERB [543239.340 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543239.340 ] -- CAP: Releasing HW buffer=2 ...
-- DEBUG [543239.340 ] -- CAP: HW buffer=2 released
-- DEBUG [543239.716 ] -- HTTP: Repeating exposed ...
-- DEBUG [543239.840 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543239.840 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543239.840 ] -- CAP: Grabbed HW buffer=2: bytesused=90763, grab_ts=543239.792, latency=0.048, skipped=0
-- DEBUG [543239.840 ] -- CAP: Calling select() on video device ...
-- VERB [543239.840 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543239.840 ] -- CAP: Releasing HW buffer=2 ...
-- DEBUG [543239.840 ] -- CAP: HW buffer=2 released
-- DEBUG [543239.892 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543239.892 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543239.892 ] -- CAP: Grabbed HW buffer=3: bytesused=90779, grab_ts=543239.840, latency=0.052, skipped=0
-- DEBUG [543239.892 ] -- CAP: Calling select() on video device ...
-- VERB [543239.892 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543239.897 ] -- CAP: Releasing HW buffer=3 ...
-- DEBUG [543239.897 ] -- CAP: HW buffer=3 released
-- DEBUG [543239.940 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543239.940 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543239.940 ] -- CAP: Grabbed HW buffer=4: bytesused=90504, grab_ts=543239.892, latency=0.048, skipped=0
-- DEBUG [543239.940 ] -- CAP: Calling select() on video device ...
-- VERB [543239.940 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543239.940 ] -- CAP: Releasing HW buffer=4 ...
-- DEBUG [543239.940 ] -- CAP: HW buffer=4 released
-- DEBUG [543240.723 ] -- HTTP: Repeating exposed ...
-- DEBUG [543240.941 ] -- CAP: Device select() --> 0; has_read=0, has_error=0
-- ERROR [543240.941 ] -- CAP: Device select() timeout
-- INFO [543240.999 ] -- Destroying workers pool JPEG ...
-- DEBUG [543240.999 ] -- Bye-bye (worker jw-0)
-- DEBUG [543240.999 ] -- CAP: Calling VIDIOC_STREAMOFF ...
-- DEBUG [543241.024 ] -- CAP: Releasing HW buffers ...
-- INFO [543241.024 ] -- CAP: Capturing stopped
================================================================================
-- DEBUG [543241.024 ] -- CAP: Opening capture device ...
-- DEBUG [543241.024 ] -- CAP: Capture device fd=8 opened
-- INFO [543241.024 ] -- Using V4L2 device: /dev/video0
-- DEBUG [543241.024 ] -- CAP: Querying device capabilities ...
-- INFO [543241.024 ] -- CAP: Using capture type: single-planar
-- INFO [543241.024 ] -- CAP: Using input channel: 0
-- DEBUG [543241.024 ] -- CAP: Using TV standard: DEFAULT
-- DEBUG [543241.024 ] -- CAP: Probing device format=MJPEG, stride=1280, resolution=640x480 ...
-- DEBUG [543241.729 ] -- HTTP: Repeating exposed ...
-- DEBUG [543242.740 ] -- HTTP: Repeating exposed ...
-- INFO [543243.251 ] -- CAP: Using resolution: 640x480
-- INFO [543243.251 ] -- CAP: Using format: MJPEG
-- DEBUG [543243.251 ] -- CAP: Querying HW FPS ...
-- INFO [543243.282 ] -- CAP: Using HW FPS: 0 -> 30 (coerced)
-- ERROR [543243.282 ] -- CAP: Device doesn't support setting of HW encoding quality parameters
-- INFO [543243.282 ] -- CAP: Using IO method: MMAP
-- DEBUG [543243.282 ] -- CAP: Requesting 5 device buffers for MMAP ...
-- INFO [543243.282 ] -- CAP: Requested 5 device buffers, got 5
-- DEBUG [543243.282 ] -- CAP: Allocating device buffers ...
-- DEBUG [543243.282 ] -- CAP: Calling us_xioctl(VIDIOC_QUERYBUF) for device buffer=0 ...
-- DEBUG [543243.282 ] -- CAP: Mapping device buffer=0 ...
-- DEBUG [543243.283 ] -- CAP: Calling us_xioctl(VIDIOC_QUERYBUF) for device buffer=1 ...
-- DEBUG [543243.283 ] -- CAP: Mapping device buffer=1 ...
-- DEBUG [543243.283 ] -- CAP: Calling us_xioctl(VIDIOC_QUERYBUF) for device buffer=2 ...
-- DEBUG [543243.283 ] -- CAP: Mapping device buffer=2 ...
-- DEBUG [543243.283 ] -- CAP: Calling us_xioctl(VIDIOC_QUERYBUF) for device buffer=3 ...
-- DEBUG [543243.283 ] -- CAP: Mapping device buffer=3 ...
-- DEBUG [543243.283 ] -- CAP: Calling us_xioctl(VIDIOC_QUERYBUF) for device buffer=4 ...
-- DEBUG [543243.283 ] -- CAP: Mapping device buffer=4 ...
-- DEBUG [543243.283 ] -- CAP: Calling us_xioctl(VIDIOC_QBUF) for buffer=0 ...
-- DEBUG [543243.283 ] -- CAP: Calling us_xioctl(VIDIOC_QBUF) for buffer=1 ...
-- DEBUG [543243.283 ] -- CAP: Calling us_xioctl(VIDIOC_QBUF) for buffer=2 ...
-- DEBUG [543243.283 ] -- CAP: Calling us_xioctl(VIDIOC_QBUF) for buffer=3 ...
-- DEBUG [543243.283 ] -- CAP: Calling us_xioctl(VIDIOC_QBUF) for buffer=4 ...
-- INFO [543243.296 ] -- CAP: Capturing started
-- INFO [543243.296 ] -- Switching to HW encoder: the input is (M)JPEG ...
-- INFO [543243.296 ] -- Using JPEG quality: encoder default
-- INFO [543243.296 ] -- Creating pool JPEG with 1 workers ...
-- DEBUG [543243.296 ] -- Hello! I am a worker jw-0 ^_^
-- DEBUG [543243.297 ] -- Worker jw-0 waiting for a new job ...
-- INFO [543243.297 ] -- Capturing ...
-- DEBUG [543243.297 ] -- CAP: Calling select() on video device ...
-- DEBUG [543243.492 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543243.492 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543243.492 ] -- CAP: Grabbed HW buffer=0: bytesused=37507, grab_ts=543243.300, latency=0.192, skipped=0
-- PERF [543243.492 ] -- FPS: STREAM-CAPTURED: 4
-- DEBUG [543243.492 ] -- CAP: Calling select() on video device ...
-- VERB [543243.493 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543243.498 ] -- CAP: Releasing HW buffer=0 ...
-- DEBUG [543243.498 ] -- CAP: HW buffer=0 released
-- DEBUG [543243.544 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543243.544 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543243.544 ] -- CAP: Grabbed HW buffer=1: bytesused=88595, grab_ts=543243.492, latency=0.052, skipped=0
-- DEBUG [543243.544 ] -- CAP: Calling select() on video device ...
-- VERB [543243.544 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543243.549 ] -- CAP: Releasing HW buffer=1 ...
-- DEBUG [543243.549 ] -- CAP: HW buffer=1 released
-- DEBUG [543243.746 ] -- HTTP: Repeating exposed ...
-- DEBUG [543243.992 ] -- CAP: Device select() --> 1; has_read=1, has_error=0
-- DEBUG [543243.992 ] -- CAP: Grabbing hw buffer ...
-- DEBUG [543243.992 ] -- CAP: Grabbed HW buffer=1: bytesused=88382, grab_ts=543243.912, latency=0.080, skipped=0
-- DEBUG [543243.992 ] -- CAP: Calling select() on video device ...
-- VERB [543243.992 ] -- JPEG: Passed encoding because nobody is watching
-- DEBUG [543243.998 ] -- CAP: Releasing HW buffer=1 ...
-- DEBUG [543243.998 ] -- CAP: HW buffer=1 released
-- DEBUG [543244.756 ] -- HTTP: Repeating exposed ...
-- DEBUG [543244.994 ] -- CAP: Device select() --> 0; has_read=0, has_error=0
-- ERROR [543244.994 ] -- CAP: Device select() timeout
-- INFO [543245.094 ] -- Destroying workers pool JPEG ...
-- DEBUG [543245.094 ] -- Bye-bye (worker jw-0)
-- DEBUG [543245.094 ] -- CAP: Calling VIDIOC_STREAMOFF ...
-- DEBUG [543245.120 ] -- CAP: Releasing HW buffers ...
-- INFO [543245.120 ] -- CAP: Capturing stopped
================================================================================