Created
October 25, 2012 16:02
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| // I'm using a virtual video capture device via the vivi kernel module | |
| # modprobe vivi | |
| // This creates /dev/video0 if no other devices have yet been enumerated. | |
| // Display available formats for the video device | |
| # yavta --enum-formats /dev/video0 | |
| Device /dev/video0 opened. | |
| Device `vivi' on `vivi-000' is a video capture device. | |
| - Available formats: | |
| Format 0: YUYV (56595559) | |
| Type: Video capture (1) | |
| Name: 4:2:2, packed, YUYV | |
| Format 1: UYVY (59565955) | |
| Type: Video capture (1) | |
| Name: 4:2:2, packed, UYVY | |
| Format 2: RGB565 (50424752) | |
| Type: Video capture (1) | |
| Name: RGB565 (LE) | |
| Format 3: RGB565X (52424752) | |
| Type: Video capture (1) | |
| Name: RGB565 (BE) | |
| Format 4: RGB555 (4f424752) | |
| Type: Video capture (1) | |
| Name: RGB555 (LE) | |
| Format 5: RGB555X (51424752) | |
| Type: Video capture (1) | |
| Name: RGB555 (BE) | |
| Video format: RGB565 (50424752) 640x480 (stride 1280) buffer size 614400 | |
| // Choose a format and dimensions, then use yavta to capture and dump some frames | |
| # yavta -f RGB565 -s 640x480 -n 4 --capture=5 -F /dev/video0 | |
| // This command will capture 5 frames (--capture=5) using 4 buffers (-n 4) with a | |
| // size of 640x480 (-s 640x480) in the rgb565 little endian format (-f RGB565), | |
| // then it will dump them to files (-F) named frame-00000x.bin | |
| // Change the file extensions to indicate the format (required for conversion by ffmpeg) | |
| # mv frame-000001.{bin,rgb} | |
| // To display the raw 16-bit rgb files, I convert them to the png format using ffmpeg | |
| # ffmpeg -s 640x480 -pix_fmt rgb565le -i frame-000001.rgb -f image2 -pix_fmt rgb24 frame1.png |
Hi, any update? I have a similar issue
we actually changed driver .c file to support YUYV format which worked for us.
Thank you
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after running yavta commnd by killing windows manager i got a information of
root@am437x-evm:/# yavta -c10 -fUYVY -s720x576 -n4 --capture=5 -F /dev/video0
Device /dev/video0 opened.
Device
TI AM437x VPFE' onplatform:vpfe 48328000.vpfe' is a video output (without mplanes) device.Video format set: UYVY (59565955) 720x480 (stride 1440) field interlaced buffer size 691200
Video format: UYVY (59565955) 720x480 (stride 1440) field interlaced buffer size 691200
4 buffers requested.
length: 691200 offset: 0 timestamp type/source: mono/EoF
Buffer 0/0 mapped at address 0xb6d53000.
length: 691200 offset: 692224 timestamp type/source: mono/EoF
Buffer 1/0 mapped at address 0xb6caa000.
length: 691200 offset: 1384448 timestamp type/source: mono/EoF
Buffer 2/0 mapped at address 0xb6c01000.
length: 691200 offset: 2076672 timestamp type/source: mono/EoF
Buffer 3/0 mapped at address 0xb6b58000.
but it is hanging like that only why
so i am not understanding what to do there after i waited for a while and pressed ctrl + c to stop
next i am not getting what to do