yavta notes

gistfile1.txt

// 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

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' on platform: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

Hi, any update? I have a similar issue

we actually changed driver .c file to support YUYV format which worked for us.
Thank you