v4l2-ctl tool help content

[ShellAlbert]

zhangshaoyan@YNT5:~$ v4l2-ctl --help-all

General/Common options: --all display all information available -C, --get-ctrl=[,...] get the value of the controls [VIDIOC_G_EXT_CTRLS] -c, --set-ctrl==[,=...] set the value of the controls [VIDIOC_S_EXT_CTRLS] -D, --info show driver info [VIDIOC_QUERYCAP] -d, --device= use device instead of /dev/video0 if starts with a digit, then /dev/video is used -e, --out-device= use device for output streams instead of the default device as set with --device if starts with a digit, then /dev/video is used -h, --help display this help message --help-all all options --help-io input/output options --help-misc miscellaneous options --help-overlay overlay format options --help-sdr SDR format options --help-selection crop/selection options --help-stds standards and other video timings options --help-streaming streaming options --help-tuner tuner/modulator options --help-vbi VBI format options --help-vidcap video capture format options --help-vidout vidout output format options --help-edid edid handling options -k, --concise be more concise if possible. -l, --list-ctrls display all controls and their values [VIDIOC_QUERYCTRL] -L, --list-ctrls-menus display all controls and their menus [VIDIOC_QUERYMENU] -r, --subset=[,,]+ the subset of the N-dimensional array to get/set for control , for every dimension an (, ) tuple is given. -w, --wrapper use the libv4l2 wrapper library. --list-devices list all v4l devices --log-status log the board status in the kernel log [VIDIOC_LOG_STATUS] --get-priority query the current access priority [VIDIOC_G_PRIORITY] --set-priority= set the new access priority [VIDIOC_S_PRIORITY]

is 1 (background), 2 (interactive) or 3 (record) --silent only set the result code, do not print any messages --sleep= sleep , call QUERYCAP and close the file handle --verbose turn on verbose ioctl status reporting Tuner/Modulator options: -F, --get-freq query the frequency [VIDIOC_G_FREQUENCY] -f, --set-freq= set the frequency to MHz [VIDIOC_S_FREQUENCY] -T, --get-tuner query the tuner settings [VIDIOC_G_TUNER] -t, --set-tuner= set the audio mode of the tuner [VIDIOC_S_TUNER] Possible values: mono, stereo, lang2, lang1, bilingual --tuner-index= Use idx as tuner idx for tuner/modulator commands --list-freq-bands display all frequency bands for the tuner/modulator [VIDIOC_ENUM_FREQ_BANDS] --get-modulator query the modulator settings [VIDIOC_G_MODULATOR] --set-modulator= set the sub-carrier modulation [VIDIOC_S_MODULATOR] is one of: mono: Modulate as mono mono-rds: Modulate as mono with RDS (radio only) stereo: Modulate as stereo stereo-rds: Modulate as stereo with RDS (radio only) bilingual: Modulate as bilingual mono-sap: Modulate as mono with Second Audio Program stereo-sap: Modulate as stereo with Second Audio Program --freq-seek=dir=<0/1>,wrap=<0/1>,spacing=,low=,high= perform a hardware frequency seek [VIDIOC_S_HW_FREQ_SEEK] dir is 0 (seek downward) or 1 (seek upward) wrap is 0 (do not wrap around) or 1 (wrap around) spacing sets the seek resolution (use 0 for default) low and high set the low and high seek frequency range in MHz Input/Output options: -I, --get-input query the video input [VIDIOC_G_INPUT] -i, --set-input= set the video input to [VIDIOC_S_INPUT] -N, --list-outputs display video outputs [VIDIOC_ENUMOUTPUT] -n, --list-inputs display video inputs [VIDIOC_ENUMINPUT] -O, --get-output query the video output [VIDIOC_G_OUTPUT] -o, --set-output= set the video output to [VIDIOC_S_OUTPUT] --set-audio-output= set the audio output to [VIDIOC_S_AUDOUT] --get-audio-input query the audio input [VIDIOC_G_AUDIO] --set-audio-input= set the audio input to [VIDIOC_S_AUDIO] --get-audio-output query the audio output [VIDIOC_G_AUDOUT] --set-audio-output= set the audio output to [VIDIOC_S_AUDOUT] --list-audio-outputs display audio outputs [VIDIOC_ENUMAUDOUT] --list-audio-inputs display audio inputs [VIDIOC_ENUMAUDIO] Standards/Timings options: --list-standards display supported video standards [VIDIOC_ENUMSTD] -S, --get-standard query the video standard [VIDIOC_G_STD] -s, --set-standard= set the video standard to [VIDIOC_S_STD] a numerical v4l2_std value, or one of: pal or pal-X (X = B/G/H/N/Nc/I/D/K/M/60) (V4L2_STD_PAL) ntsc or ntsc-X (X = M/J/K) (V4L2_STD_NTSC) secam or secam-X (X = B/G/H/D/K/L/Lc) (V4L2_STD_SECAM) --get-detected-standard display detected input video standard [VIDIOC_QUERYSTD] --list-dv-timings list supp. standard dv timings [VIDIOC_ENUM_DV_TIMINGS] --set-dv-bt-timings query: use the output of VIDIOC_QUERY_DV_TIMINGS index=: use the index as provided by --list-dv-timings or specify timings using cvt/gtf options as follows: cvt/gtf,width=,height=,fps= interlaced=<0/1>,reduced-blanking=<0/1/2>,reduced-fps=<0/1> The value of reduced-blanking, if greater than 0, indicates that reduced blanking is to be used and the value indicate the version. For gtf, there is no version 2 for reduced blanking, and the value 1 or 2 will give same results. reduced-fps = 1, slows down pixel clock by factor of 1000 / 1001, allowing to support NTSC frame rates like 29.97 or 59.94. Reduced fps flag takes effect only with reduced blanking version 2 and, when refresh rate is an integer multiple of 6, say, fps = 24,30,60 etc. or update all or part of the current timings fields: width=,height=,interlaced=<0/1>, polarities=,pixelclock=, hfp=,hs=, hbp=,vfp=, vs=,vbp=, il_vfp=, il_vs=, il_vbp=. clear: start with zeroed timings instead of the current timings. set the digital video timings according to the BT 656/1120 standard [VIDIOC_S_DV_TIMINGS] --get-dv-timings get the digital video timings in use [VIDIOC_G_DV_TIMINGS] --query-dv-timings query the detected dv timings [VIDIOC_QUERY_DV_TIMINGS] --get-dv-timings-cap get the dv timings capabilities [VIDIOC_DV_TIMINGS_CAP] Video Capture Formats options: --list-formats display supported video formats [VIDIOC_ENUM_FMT] --list-formats-ext display supported video formats including frame sizes and intervals --list-framesizes= list supported framesizes for pixelformat [VIDIOC_ENUM_FRAMESIZES] pixelformat is the fourcc value as a string --list-frameintervals=width=,height=,pixelformat= list supported frame intervals for pixelformat and the given width and height [VIDIOC_ENUM_FRAMEINTERVALS] pixelformat is the fourcc value as a string --list-fields list supported fields for the current format -V, --get-fmt-video query the video capture format [VIDIOC_G_FMT] -v, --set-fmt-video --try-fmt-video=width=,height=,pixelformat=,field=,colorspace=, xfer=,ycbcr=,quantization=,premul-alpha,bytesperline= set/try the video capture format [VIDIOC_S/TRY_FMT] pixelformat is either the format index as reported by --list-formats, or the fourcc value as a string. The bytesperline option can be used multiple times, once for each plane. premul-alpha sets V4L2_PIX_FMT_FLAG_PREMUL_ALPHA. can be one of the following field layouts: any, none, top, bottom, interlaced, seq_tb, seq_bt, alternate, interlaced_tb, interlaced_bt can be one of the following colorspaces: smpte170m, smpte240m, rec709, 470m, 470bg, jpeg, srgb, adobergb, bt2020, dcip3 can be one of the following transfer functions: default, 709, srgb, adobergb, smpte240m, smpte2084, dcip3, none can be one of the following Y'CbCr encodings: default, 601, 709, xv601, xv709, bt2020, bt2020c, smpte240m can be one of the following quantization methods: default, full-range, lim-range Video Output Formats options: --list-formats-out display supported video output formats [VIDIOC_ENUM_FMT] --list-fields-out list supported fields for the current output format --get-fmt-video-out query the video output format [VIDIOC_G_FMT] --set-fmt-video-out --try-fmt-video-out=width=,height=,pixelformat=,field=,colorspace=, xfer=,ycbcr=,quantization=,premul-alpha,bytesperline= set/try the video output format [VIDIOC_S/TRY_FMT] pixelformat is either the format index as reported by --list-formats-out, or the fourcc value as a string. premul-alpha sets V4L2_PIX_FMT_FLAG_PREMUL_ALPHA. The bytesperline option can be used multiple times, once for each plane. can be one of the following field layouts: any, none, top, bottom, interlaced, seq_tb, seq_bt, alternate, interlaced_tb, interlaced_bt can be one of the following colorspaces: smpte170m, smpte240m, rec709, 470m, 470bg, jpeg, srgb, adobergb, bt2020, dcip3 can be one of the following transfer functions: default, 709, srgb, adobergb, smpte240m, smpte2084, dcip3, none can be one of the following Y'CbCr encodings: default, 601, 709, xv601, xv709, bt2020, bt2020c, smpte240m can be one of the following quantization methods: default, full-range, lim-range Video Overlay options: --list-formats-overlay display supported overlay formats [VIDIOC_ENUM_FMT] --find-fb find the fb device corresponding with the overlay --overlay= turn overlay on (1) or off (0) (VIDIOC_OVERLAY) --get-fmt-overlay query the video or video output overlay format [VIDIOC_G_FMT] --set-fmt-overlay --try-fmt-overlay=chromakey=,global_alpha=, top=,left=,width=,height=,field= set/try the video or video output overlay format [VIDIOC_TRY/S_FMT] can be one of: any, none, top, bottom, interlaced, seq_tb, seq_bt, alternate, interlaced_tb, interlaced_bt If the width or height changed then the old clip list and bitmap will be invalidated. --clear-clips clear any old clips, to be used in combination with --try/set-fmt-overlay --clear-bitmap clear any old bitmap, to be used in combination with --try/set-fmt-overlay --add-clip=top=,left=,width=,height= Add an entry to the clip list. May be used multiple times. This clip list will be passed to --try/set-fmt-overlay --add-bitmap=top=,left=,width=,height= Set the bits in the given rectangle in the bitmap to 1. May be used multiple times. The bitmap will be passed to --try/set-fmt-overlay --get-fbuf query the overlay framebuffer data [VIDIOC_G_FBUF] --set-fbuf=chromakey=,src_chromakey=,global_alpha=,local_alpha=,local_inv_alpha=,fb= set the overlay framebuffer [VIDIOC_S_FBUF] is 0 or 1 is the framebuffer device (/dev/fbX) if starts with a digit, then /dev/fb is used VBI Formats options: --get-sliced-vbi-cap query the sliced VBI capture capabilities [VIDIOC_G_SLICED_VBI_CAP] --get-sliced-vbi-out-cap query the sliced VBI output capabilities [VIDIOC_G_SLICED_VBI_CAP] -B, --get-fmt-sliced-vbi query the sliced VBI capture format [VIDIOC_G_FMT] --get-fmt-sliced-vbi-out query the sliced VBI output format [VIDIOC_G_FMT] -b, --set-fmt-sliced-vbi --try-fmt-sliced-vbi --set-fmt-sliced-vbi-out --try-fmt-sliced-vbi-out= set/try the sliced VBI capture/output format to [VIDIOC_S/TRY_FMT], is a comma separated list of: off: turn off sliced VBI (cannot be combined with other modes) teletext: teletext (PAL/SECAM) cc: closed caption (NTSC) wss: widescreen signal (PAL/SECAM) vps: VPS (PAL/SECAM) --get-fmt-vbi query the VBI capture format [VIDIOC_G_FMT] --get-fmt-vbi-out query the VBI output format [VIDIOC_G_FMT] --set-fmt-vbi --try-fmt-vbi --set-fmt-vbi-out --try-fmt-vbi-out=samplingrate=,offset=,samplesperline=, start0=,count0=,start1=,count1= set/try the raw VBI capture/output format [VIDIOC_S/TRY_FMT] samplingrate: samples per second offset: horizontal offset in samples samplesperline: samples per line start0: start line number of the first field count0: number of lines in the first field start1: start line number of the second field count1: number of lines in the second field SDR Formats options: --list-formats-sdr display supported SDR capture formats [VIDIOC_ENUM_FMT] --get-fmt-sdr query the SDR capture format [VIDIOC_G_FMT] --set-fmt-sdr= set the SDR capture format [VIDIOC_S_FMT] parameter is either the format index as reported by --list-formats-sdr-cap, or the fourcc value as a string --try-fmt-sdr= try the SDR capture format [VIDIOC_TRY_FMT] parameter is either the format index as reported by --list-formats-sdr-cap, or the fourcc value as a string --list-formats-sdr-out display supported SDR output formats [VIDIOC_ENUM_FMT] --get-fmt-sdr-out query the SDR output format [VIDIOC_G_FMT] --set-fmt-sdr-out= set the SDR output format [VIDIOC_S_FMT] parameter is either the format index as reported by --list-formats-sdr-out, or the fourcc value as a string --try-fmt-sdr-out= try the SDR output format [VIDIOC_TRY_FMT] parameter is either the format index as reported by --list-formats-sdr-out, or the fourcc value as a string Metadata Formats options: --list-formats-meta display supported metadata capture formats [VIDIOC_ENUM_FMT] --get-fmt-meta query the metadata capture format [VIDIOC_G_FMT] --set-fmt-meta= set the metadata capture format [VIDIOC_S_FMT] parameter is either the format index as reported by --list-formats-meta-cap, or the fourcc value as a string --try-fmt-meta= try the metadata capture format [VIDIOC_TRY_FMT] parameter is either the format index as reported by --list-formats-meta-cap, or the fourcc value as a string --list-formats-meta-out display supported metadata output formats [VIDIOC_ENUM_FMT] --get-fmt-meta-out query the metadata output format [VIDIOC_G_FMT] --set-fmt-meta-out= set the metadata output format [VIDIOC_S_FMT] parameter is either the format index as reported by --list-formats-meta-out, or the fourcc value as a string --try-fmt-meta-out= try the metadata output format [VIDIOC_TRY_FMT] parameter is either the format index as reported by --list-formats-meta-out, or the fourcc value as a string Selection/Cropping options: --get-cropcap query the crop capabilities [VIDIOC_CROPCAP] --get-crop query the video capture crop window [VIDIOC_G_CROP] --set-crop=top=,left=,width=,height= set the video capture crop window [VIDIOC_S_CROP] --get-cropcap-output query crop capabilities for video output [VIDIOC_CROPCAP] --get-crop-output query the video output crop window [VIDIOC_G_CROP] --set-crop-output=top=,left=,width=,height= set the video output crop window [VIDIOC_S_CROP] --get-cropcap-overlay query crop capabilities for video overlay [VIDIOC_CROPCAP] --get-crop-overlay query the video overlay crop window [VIDIOC_G_CROP] --set-crop-overlay=top=,left=,width=,height= set the video overlay crop window [VIDIOC_S_CROP] --get-cropcap-output-overlay query the crop capabilities for video output overlays [VIDIOC_CROPCAP] --get-crop-output-overlay query the video output overlay crop window [VIDIOC_G_CROP] --set-crop-output-overlay=top=,left=,width=,height= set the video output overlay crop window [VIDIOC_S_CROP] --get-selection=target= query the video capture selection rectangle [VIDIOC_G_SELECTION] See --set-selection command for the valid values. --set-selection=target=,flags=,top=,left=,width=,height= set the video capture selection rectangle [VIDIOC_S_SELECTION] target=crop|crop_bounds|crop_default|compose|compose_bounds| compose_default|compose_padded|native_size flags=le|ge --get-selection-output=target= query the video output selection rectangle [VIDIOC_G_SELECTION] See --set-selection command for the valid values. --set-selection-output=target=,flags=,top=,left=,width=,height= set the video output selection rectangle [VIDIOC_S_SELECTION] See --set-selection command for the arguments. Miscellaneous options: --wait-for-event= wait for an event [VIDIOC_DQEVENT] is the event number or one of: eos, vsync, ctrl=, frame_sync, source_change=, motion_det where is the name of the control and where is the index of the pad or input --poll-for-event= poll for an event [VIDIOC_DQEVENT] see --wait-for-event for possible events -P, --get-parm display video parameters [VIDIOC_G_PARM] -p, --set-parm= set video framerate in [VIDIOC_S_PARM] --get-output-parm display output video parameters [VIDIOC_G_PARM] --set-output-parm= set output video framerate in [VIDIOC_S_PARM] --get-jpeg-comp query the JPEG compression [VIDIOC_G_JPEGCOMP] --set-jpeg-comp=quality=,markers=,comment=,app= set the JPEG compression [VIDIOC_S_JPEGCOMP] is the app segment: 0-9/a-f, is the actual string. is a colon separated list of: dht: Define Huffman Tables dqt: Define Quantization Tables dri: Define Restart Interval --encoder-cmd=cmd=,flags= Send a command to the encoder [VIDIOC_ENCODER_CMD] cmd=start|stop|pause|resume flags=stop_at_gop_end --try-encoder-cmd=cmd=,flags= Try an encoder command [VIDIOC_TRY_ENCODER_CMD] See --encoder-cmd for the arguments. --decoder-cmd=cmd=,flags=,stop_pts=,start_speed=, start_format= Send a command to the decoder [VIDIOC_DECODER_CMD] cmd=start|stop|pause|resume flags=start_mute_audio|pause_to_black|stop_to_black| stop_immediately --try-decoder-cmd=cmd=,flags= Try a decoder command [VIDIOC_TRY_DECODER_CMD] See --decoder-cmd for the arguments. Video Streaming options: --stream-count= stream buffers. The default is to keep streaming forever. This count does not include the number of initial skipped buffers as is passed by --stream-skip. --stream-skip= skip the first buffers. The default is 0. --stream-sleep= sleep for 1 second every buffers. If is 0, then sleep forever right after streaming starts. The default is -1 (never sleep). --stream-to= stream to this file. The default is to discard the data. If is '-', then the data is written to stdout and the --silent option is turned on automatically. --stream-to-host= stream to this host. The default port is 8362. --stream-poll use non-blocking mode and select() to stream. --stream-mmap= capture video using mmap() [VIDIOC_(D)QBUF] count: the number of buffers to allocate. The default is 3. --stream-user= capture video using user pointers [VIDIOC_(D)QBUF] count: the number of buffers to allocate. The default is 3. --stream-dmabuf capture video using dmabuf [VIDIOC_(D)QBUF] Requires a corresponding --stream-out-mmap option. --stream-from= stream from this file. The default is to generate a pattern. If is '-', then the data is read from stdin. --stream-from-host= stream from this host. The default port is 8362. --stream-no-query Do not query and set the DV timings or standard before streaming. --stream-loop loop when the end of the file we are streaming from is reached. The default is to stop. --stream-out-pattern= choose output test pattern. The default is 0. --stream-out-square show a square in the middle of the output test pattern. --stream-out-border show a border around the pillar/letterboxed video. --stream-out-sav insert an SAV code in every line. --stream-out-eav insert an EAV code in every line. --stream-out-pixel-aspect= can be one of: square, ntsc, pal --stream-out-video-aspect= can be one of: 4x3, 14x9, 16x9, anamorphic --stream-out-alpha= value to use for the alpha component, range 0-255. The default is 0. --stream-out-alpha-red-only only use the --stream-out-alpha value for the red colors, for all others use 0. --stream-out-rgb-lim-range Encode RGB values as limited [16-235] instead of full range. --stream-out-hor-speed= choose speed for horizontal movement. The default is 0, and the range is [-3...3]. --stream-out-vert-speed= choose speed for vertical movement. The default is 0, and the range is [-3...3]. --stream-out-perc-fill= percentage of the frame to actually fill. The default is 100%. --stream-out-mmap= output video using mmap() [VIDIOC_(D)QBUF] count: the number of buffers to allocate. The default is 4. --stream-out-user= output video using user pointers [VIDIOC_(D)QBUF] count: the number of buffers to allocate. The default is 4. --stream-out-dmabuf output video using dmabuf [VIDIOC_(D)QBUF] Requires a corresponding --stream-mmap option. --list-patterns list available patterns for use with --stream-pattern. --list-buffers list all video buffers [VIDIOC_QUERYBUF] --list-buffers-out list all video output buffers [VIDIOC_QUERYBUF] --list-buffers-vbi list all VBI buffers [VIDIOC_QUERYBUF] --list-buffers-vbi-out list all VBI output buffers [VIDIOC_QUERYBUF] --list-buffers-sliced-vbi list all sliced VBI buffers [VIDIOC_QUERYBUF] --list-buffers-sliced-vbi-out list all sliced VBI output buffers [VIDIOC_QUERYBUF] --list-buffers-sdr list all SDR RX buffers [VIDIOC_QUERYBUF] --list-buffers-sdr-out list all SDR TX buffers [VIDIOC_QUERYBUF] --list-buffers-meta list all Meta RX buffers [VIDIOC_QUERYBUF] EDID options: --set-edid=pad=[,type=|file=][,format=][modifiers] is the input or output index for which to set the EDID. can be 'hdmi', 'hdmi-4k-170mhz', 'hdmi-4k-300mhz', 'hdmi-4k-600mhz', 'dvid' or 'vga'. A predefined EDID suitable for that connector type will be set. It has a 1920x1080p60 native resolution for the non-4k variants and a 3840x2160 resolution for the 4k variants (4kp30 YCbCr 4:2:0 for 170mhz, 4kp30 for 300 mhz and 4kp60 for 600 mhz). If is '-', then the data is read from stdin, otherwise it is read from the given file. The file format must be in hex as in get-edid. The 'type' or 'file' arguments are mutually exclusive. One of the two must be specified. is one of: hex: hex numbers in ascii text (default) raw: raw binary EDID content [modifiers] is a comma-separate list of EDID modifiers: CTA-861 Header modifiers: underscan: toggle the underscan bit. audio: toggle the audio bit. ycbcr444: toggle the YCbCr 4:4:4 bit. ycbcr422: toggle the YCbCr 4:2:2 bit. Speaker Allocation Data Block modifiers: fl-fr: Front Left/Right. lfe: Low Frequency Effects. fc: Front Center. bl-br: Back Left/Right. bc: Back Center. rlc-frc: Front Left/Right of Center. rlc-rrc: Rear Left/Right of Center. flw-frw: Front Left/Right Wide. tpfl-tpfr: Top Front Left/Right. tpc: Top Center. tpfc: Top Front Center. ls-rs: Left/Right Surround. lfe2: Low Frequency Effects 2. tpbc: Top Back Center. sil-sir: Side Left/Right tpsil-tpsir: Top Side Left/Right. tpbl-tpbr: Top Back Left/Right. btfc: Bottom Front Center. btfl-btbr: Bottom Front Left/Right. tpls-tprs: Top Left/Right Surround. HDMI Vendor-Specific Data Block modifiers: pa=: change the physical address. y444: toggle the YCbCr 4:4:4 Deep Color bit. 30-bit: toggle the 30 bits/pixel bit. 36-bit: toggle the 36 bits/pixel bit. 48-bit: toggle the 48 bits/pixel bit. graphics: toggle the Graphics Content Type bit. photo: toggle the Photo Content Type bit. cinema: toggle the Cinema Content Type bit. game: toggle the Game Content Type bit. HDMI Forum Vendor-Specific Data Block modifiers: scdc: toggle the SCDC Present bit. CTA-861 Video Capability Descriptor modifiers: qy: toggle the QY YCC Quantization Range bit. qs: toggle the QS RGB Quantization Range bit. s-pt=<0-3>: set the PT Preferred Format Over/underscan bits. s-it=<0-3>: set the IT Over/underscan bits. s-ce=<0-3>: set the CE Over/underscan bits. CTA-861 Colorimetry Data Block modifiers: xvycc-601: toggle the xvYCC 601 bit. xvycc-709: toggle the xvYCC 709 bit. sycc: toggle the sYCC 601 bit. adobe-ycc: toggle the Adobe YCC 601 bit. adobe-rgb: toggle the Adobe RGB bit. bt2020-rgb: toggle the BT2020 RGB bit. bt2020-ycc: toggle the BT2020 YCC bit. bt2020-cycc: toggle the BT2020 cYCC bit. dci-p3: toggle the DCI-P3 bit. CTA-861 HDR Static Metadata Data Block modifiers: sdr: toggle the Traditional gamma SDR bit. hdr: toggle the Traditional gamma HDR bit. smpte2084: toggle the SMPTE ST 2084 bit. hlg: toggle the Hybrid Log-Gamma bit. --clear-edid= is the input or output index for which to clear the EDID. --info-edid= print the current EDID's modifiers is the input or output index for which to get the EDID. --get-edid=pad=,startblock=,blocks=,format=,file= is the input or output index for which to get the EDID. is the first block number you want to read. Default 0. is the number of blocks you want to read. Default is all blocks. is one of: hex: hex numbers in ascii text (default) raw: can be piped directly into the edid-decode tool carray: c-program struct If is '-' or not the 'file' argument is not supplied, then the data is written to stdout. --fix-edid-checksums If specified then any checksum errors will be fixed silently. zhangshaoyan@YNT5:~$