jensstigaard
commented
4 years ago Hi Jonas
Have you made sure you have set the colorspace of the receiver to use RGB? I would assume that if you use UYUV color, it could be the cause of only 2 bytes per pixel is received, e.g. on 4:2:2 color.
Venlig hilsen/Best regards
Jens Grønhøj Stigaard +45 2172 1600 jens@stigaard.info
jonas-db skrev den 2020-04-25 11:26:
Hello
First of all: thank you, this library is pure gold!
Secondly: i'm trying to write the video frame to an image. I've tried the following code which seems to almost do what I need. However, the output is a bit strange and I can't figure out what mistake i'm making. I'm sure this will be helpful for other people as well. Any ideas? @jensstigaard [1]
{ type: 'video', xres: 1280, yres: 720, frameRateN: 60000, frameRateD: 1000, pictureAspectRatio: 1.7777777910232544, timestamp: [ 1587804321, 141302900 ], frameFormatType: 1, timecode: [ 8, 160623700 ], lineStrideBytes: 2560, data: <Buffer 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 80 10 ... > }
length of buffer is 1843200 (which makes me think this is 16bit and not 8bit as mentioned in the docs)
const width = dataFrame.xres // 1280 const height = dataFrame.yres // 720 const data = dataFrame.data
const Jimp = require('jimp');
const toImage = (data, width, height,i) => { new Jimp(width, height, (err, image) => {
let buffer = image.bitmap.data for (var x = 0; x < width; x++) { for (var y = 0; y < height; y++) { const offset = (y height + x) 4 // RGBA = 4 bytes
buffer[offset ] = data[offset] // R buffer[offset + 1] = data[offset+1] // G buffer[offset + 2] = data[offset+2] // B buffer[offset + 3] = data[offset+3] // Alpha } } image.write('./out/image'+i+'.jpg'); }); }
This gives me the following output (notice the strange duplication + it seems there are "4 blocks" in this image, of which 2 blocks are white)
[2]
while the original image is this: (transparant image) [3]
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[1] https://github.com/jensstigaard [2] https://user-images.githubusercontent.com/2538260/80275503-e8387880-86e1-11ea-846c-3e9daecdc25d.png [3] https://user-images.githubusercontent.com/2538260/80275509-f1c1e080-86e1-11ea-8fbc-084e14e751da.png [4] https://github.com/Streampunk/grandiose/issues/9 [5] https://github.com/notifications/unsubscribe-auth/AAO3ZMFG3ZZHXYIRDHABSLDROKUEVANCNFSM4MQU6LRQ
jonas-db
yatsenkoleg
solved