Bug: The AVPixelFormat field lacks the common MJPG pixel format. #349

Describe the Bug

MJPG is a common format for USB cameras. Logically speaking, the AVPixelFormat field should not return NONE.

To Reproduce

exp:

1. v4l2-ctl --device=/dev/video20 --list-formats-ext
   ioctl: VIDIOC_ENUM_FMT
   Type: Video Capture

    [0]: 'MJPG' (Motion-JPEG, compressed)
            Size: Discrete 1920x1080
                    Interval: Discrete 0.033s (30.000 fps)
                    Interval: Discrete 0.040s (25.000 fps)
                    Interval: Discrete 0.050s (20.000 fps)
                    Interval: Discrete 0.067s (15.000 fps)
                    Interval: Discrete 0.200s (5.000 fps)
    [1]: 'YUYV' (YUYV 4:2:2)
            Size: Discrete 640x480
                    Interval: Discrete 0.033s (30.000 fps)
                    Interval: Discrete 0.040s (25.000 fps)
                    Interval: Discrete 0.050s (20.000 fps)
                    Interval: Discrete 0.067s (15.000 fps)
   

2. const modes = await DeviceAPI.modes('/dev/video20')
   const List = modes.map(m=>({width: m.width, height: m.height, fps: m.maxFrameRate, inputFormat: avGetPixFmtName(m.pixelFormat)}))
   log:
   { width: 1920, height: 1080, fps: 30, inputFormat: null },
   { width: 1280, height: 720, fps: 30, inputFormat: null },
   { width: 640, height: 480, fps: 30, inputFormat: null },
   { width: 640, height: 480, fps: 30, inputFormat: 'yuyv422' },
   { width: 352, height: 288, fps: 30, inputFormat: null },
   { width: 320, height: 240, fps: 30, inputFormat: null },
   { width: 320, height: 240, fps: 30, inputFormat: 'yuyv422' },
   { width: 176, height: 144, fps: 30, inputFormat: null },
   { width: 160, height: 120, fps: 30, inputFormat: null }

Expected Behavior

Expected normal output: mjpeg

Code Sample

Relevant Log Output / Error Messages

no

Node.js Version

24.10.0

NodeAV Version

6.2.0-beta.12

Operating System

Armbian Linux 6.1.115-vendor-rk35xx

Installation Method

npm install

API Used

High-Level API

Hardware Acceleration

None

Additional Context

No response