Camogm - Revision history

Andrey.filippov: /* Starting camogm */

2021-07-11T21:39:58Z

Starting camogm

← Older revision		Revision as of 21:39, 11 July 2021
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	camogm /var/state/camogm_cmd &		camogm /var/state/camogm_cmd &
			camogm -n /var/state/camogm_cmd -p 1234 -s /mnt/sda1/test4

	=== Sending Commands to camogm ===		=== Sending Commands to camogm ===

Mikhail: /* allow_sync */

2017-06-16T18:47:26Z

allow_sync

← Older revision		Revision as of 18:47, 16 June 2017
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	This option is to force writing to storage after each recorded frame. Using a filesystem the OS will write data to buffer before writing to a real device.		This option is to force writing to storage after each recorded frame. Using a filesystem the OS will write data to buffer before writing to a real device.
	This is not a problem with a HDD or other storage media mounted directly on the camera, but with NFS mounted folder this causes trouble as the NFS driver will fill up the buffer and only send data over the network once the buffer is full - this causes a short hang on the camera and frames might be lost. (default: disabled)		This is not a problem with a HDD or other storage media mounted directly on the camera, but with NFS mounted folder this causes trouble as the NFS driver will fill up the buffer and only send data over the network once the buffer is full - this causes a short hang on the camera and frames might be lost. (default: disabled)
			===audio_volume===
			audio_volume=<volume>
			Set recording audio volume in percent.

	== camogmgui ==		== camogmgui ==

Mikhail at 19:15, 20 July 2016

2016-07-20T19:15:18Z

@@ Line 6: / Line 6: @@
 *'''jpeg''' - series of the individual JPEG files (1 file per frame)
 *'''mov''' - MJPEG video in Apple QuickTime(R) container
- As of today the last one (mov) is probably the fastest one in the camera as it uses the minimum of computational resources. Ogg is optimized for streaming and requires additional memory copying and checksum calculation for all of the recorded data, individual JPEG files grow large directories that can use system resources, while recording mov format simply merges FPGA-encoded frames (with JPEG and optional Exif headers added by the software) and the file header (with frame index) is calculated only once per file.
+As of today the last one (mov) is probably the fastest one in the camera as it uses the minimum of computational resources. Ogg is optimized for streaming and requires additional memory copying and checksum calculation for all of the recorded data, individual JPEG files grow large directories that can use system resources, while recording mov format simply merges FPGA-encoded frames (with JPEG and optional Exif headers added by the software) and the file header (with frame index) is calculated only once per file.
 This program makes use of the [[Circbuf|circbuf]] that can hold several seconds of even high resolution/high frame rate video, so switching from file to file and/or waiting for the search operations on the HDD will not cause the frame loss - that can be verified if the Exif headers are enabled - regardless of the format selected each frame will have the exact timestamp (with 1 microsecond resolution).
@@ Line 248: / Line 248: @@
 Please see [[Camogmgui]]

OneArtPlease: /* start_after_timestamp */

2011-06-03T18:33:33Z

start_after_timestamp

← Older revision		Revision as of 18:33, 3 June 2011
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	===start_after_timestamp===		===start_after_timestamp===
	start_after_timestamp=SS.UU # double (0123456789.012345)		start_after_timestamp=SS.UU # double (0123456789.012345)
	Delays recording start ~~(after the "start" command issued)~~ until a specific time-stamp has been reached.		Delays recording start until a specific time-stamp has been reached.
			This command alone does not start a recording you need to run the "start" command as well after setting start_after_timestamp.

	===prefix===		===prefix===

Oleg at 22:06, 20 August 2010

2010-08-20T22:06:10Z

← Older revision		Revision as of 22:06, 20 August 2010
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	===max_frames===		===max_frames===
	max_frames=<number_of_frames>		max_frames=<number_of_frames>
	Specify the maximal number of frames of each individual file segment. The new file will be started if this limit is exceeded. The default value is ?		Specify the maximal number of frames of each individual file segment. The new file will be started if this limit is exceeded. The default value is 16384.

	===frames_per_chunk===		===frames_per_chunk===
	frames_per_chunk=<number_of_frames_per_chunk>		frames_per_chunk=<number_of_frames_per_chunk> (default 10)
			Sets the number of chunk entries in the *.mov header (10 means there's 1 chunk entry with an absolute offset in the header for each 10 frames).

	===start_after_timestamp===		===start_after_timestamp===
	start_after_timestamp=~~<?>~~		start_after_timestamp=SS.UU # double (0123456789.012345)
	~~Automatically~~ start ~~recording~~ (~~as by using~~ the "start" command) ~~as soon as~~ a specific time-stamp has been reached.		Delays recording start (after the "start" command issued) until a specific time-stamp has been reached.

	===prefix===		===prefix===

OneArtPlease: /* length */

2010-08-20T21:35:28Z

length

← Older revision		Revision as of 21:35, 20 August 2010
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	===length===		===length===
	length=<file_size_in_bytes>		length=<file_size_in_bytes>
	Specify the maximal size of each individual file segment in bytes. The new file will be started if this limit will be exceeded. The limit is ~~100000000~~ bytes, current value is reported by status/xstatus commands.		Specify the maximal size of each individual file segment in bytes. The new file will be started if this limit will be exceeded. The limit is 2.147.483.647 bytes (~2 GB), current value is reported by status/xstatus commands.

	===max_frames===		===max_frames===
	max_frames=<number_of_frames>		max_frames=<number_of_frames>

OneArtPlease: /* prefix */

2010-08-20T20:23:06Z

prefix

← Older revision		Revision as of 20:23, 20 August 2010
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	length=<file_size_in_bytes>		length=<file_size_in_bytes>
	Specify the maximal size of each individual file segment in bytes. The new file will be started if this limit will be exceeded. The limit is 100000000 bytes, current value is reported by status/xstatus commands.		Specify the maximal size of each individual file segment in bytes. The new file will be started if this limit will be exceeded. The limit is 100000000 bytes, current value is reported by status/xstatus commands.
			===max_frames===
			max_frames=<number_of_frames>
			Specify the maximal number of frames of each individual file segment. The new file will be started if this limit is exceeded. The default value is ?

			===frames_per_chunk===
			frames_per_chunk=<number_of_frames_per_chunk>

			===start_after_timestamp===
			start_after_timestamp=<?>
			Automatically start recording (as by using the "start" command) as soon as a specific time-stamp has been reached.

	===prefix===		===prefix===
	prefix=<file_name_prefix>		prefix=<file_name_prefix>
	prefix value is used by the camogm to generate file names/paths to store video content. Full paths will be generated from the specified prefix, timestamps of the first frame in the segment and appropriate extension (".ogm",".jpeg" or ".mov"). The prefix consists of directory path (everything before the last slash "/") and the file name prefix (what remains after the last "/"). In the case of video formats (".ogm",".mov") the directory prefix should point to an existent directory on the mounted writeable media - camogm will not try to create missing directories and will just fail to start recording. In the case of individual JPEG files camogm will try to create the last level in directory structure if it does not exist and place all the frame files there.		prefix value is used by the camogm to generate file names/paths to store video content. Full paths will be generated from the specified prefix, timestamps of the first frame in the segment and appropriate extension (".ogm",".jpeg" or ".mov"). The prefix consists of directory path (everything before the last slash "/") and the file name prefix (what remains after the last "/"). In the case of video formats (".ogm",".mov") the directory prefix should point to an existent directory on the mounted writeable media - camogm will not try to create missing directories and will just fail to start recording. In the case of individual JPEG files camogm will try to create the last level in directory structure if it does not exist and place all the frame files there.

	===exif===		===exif===
	Controls generation and output of [[Exif]] headers for each JPEG-encoded frame. These headers slightly (for the large frames) increase the file sizes and add a little of computation to the CPU, but they are very useful for later processing as they provide precise timing information that does not depend on particular file format and timing calculations that involve frame rate and frame numbers.		Controls generation and output of [[Exif]] headers for each JPEG-encoded frame. These headers slightly (for the large frames) increase the file sizes and add a little of computation to the CPU, but they are very useful for later processing as they provide precise timing information that does not depend on particular file format and timing calculations that involve frame rate and frame numbers.

OneArtPlease: /* allow_sync */

2009-03-30T20:24:05Z

allow_sync

← Older revision		Revision as of 20:24, 30 March 2009
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	===allow_sync===		===allow_sync===
	allow_sync=<enable\|disable>		allow_sync=<enable\|disable>
	~~setting for sync mode -~~ to ~~use it~~ with NFS mounted ~~disk~~. By default disabled.		This option is to force writing to storage after each recorded frame. Using a filesystem the OS will write data to buffer before writing to a real device.
			This is not a problem with a HDD or other storage media mounted directly on the camera, but with NFS mounted folder this causes trouble as the NFS driver will fill up the buffer and only send data over the network once the buffer is full - this causes a short hang on the camera and frames might be lost. (default: disabled)

	== camogmgui ==		== camogmgui ==

OneArtPlease: /* kml_alt */

2009-03-26T11:38:21Z

kml_alt

← Older revision		Revision as of 11:38, 26 March 2009
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	===kml_alt===		===kml_alt===
	kml_alt=gps\|ground		kml_alt=[gps\|ground]
	Set altitude/height mode.		Set altitude/height mode.
	* gps - absolute GPS altitude		* gps - absolute GPS altitude

OneArtPlease: /* kml_alt */

2009-03-26T11:37:56Z

kml_alt

← Older revision		Revision as of 11:37, 26 March 2009
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	===kml_alt===		===kml_alt===
	kml_alt=0\|1		kml_alt=gps\|ground
	Set altitude/height mode.		Set altitude/height mode.
	* 1 - absolute		* gps - absolute GPS altitude
	* 0 - relative to ground (default)		* ground - relative to ground (default)

	===kml_height===		===kml_height===