SigSegv upon calling encode() about beamcoder HOT 6 CLOSED

Great.
FFmpeg has deprecated yuvj422p format apparently - you will probably be seeing a warning about this. In my example I have used the yuv422p format and used a colorspace filter to set the jpeg output range.

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SigSev issue is too deep inside FFmpeg to defend against. Ideally the MJPEG encoder could be at little nicer.

Closing as main issue is resolved.

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I think the issue is that the mjpeg encoder only accepts the following planar pixel formats:

[ 'yuvj420p', 'yuvj422p', 'yuvj444p' ]

You can see this with the following:

beamcoder.encoders()['mjpeg'].pix_fmts

You would need to convert the interleaved data from macadam into the planar form (data[0] for Y, data[1] for U and data[2] for V) before encoding.

However, I wish you had not got a segfault ... I'll see if I can turn this into a more friendly error before closing this issue.

from beamcoder.

I have added an example app that has a filtering implementation that with small modifications should help you avoid this problem. Take a look at examples/jpeg_filter_app.js.

from beamcoder.

Something like the following just before calling encode:

  let filt = await beamcoder.filterer({
    filterType: 'video',
    inputParams: [{
      width: f.video.width,
      height: f.video.height,
      pixelFormat: 'uyvy422',
      timeBase: [ 1, 25 ],
      pixelAspect: [ 1, 1 ] }],
    outputParams: [{ pixelFormat: 'yuv422p' }],
    filterSpec: 'scale=640:360, colorspace=range=jpeg:all=bt709' })

  let filtResult = await filt.filter([{ frames: [ f ] }]);
  let filtFrame = filtResult[0].frames[0]
    
  let jpg = await enc.encode(filtFrame)
  ...

I haven't tested this as I don't have any BMD hardware at the moment - but I hope it helps!

from beamcoder.

Yup, that's pretty much what I did:

filterer = await beamcoder.filterer({
    filterType: 'video',
    inputParams: [
        {
            width: 1280,
            height: 720,
            pixelFormat: 'uyvy422',
            pixelAspect: [1, 1],
            timeBase: [1, 1]
        }
    ],
    outputParams: [
        {
            pixelFormat: 'yuvj422p'
        }
    ],
    filterSpec: 'format=pix_fmts=yuvj422p'
})

let filtFrames = await filterer.filter([{ frames: { frames: [ frame ] } }])
let jpg = await enc.encode(filtFrames[0].frames[0])

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