Saturday 24 November 2018

video - ffmpeg matches no streams


I'm trying to make complex filters with fluent ffmpeg work, but getting the error:



Stream specifier 'pts' in filtergraph description [0:v]setpts=0.3333333333333333*PTS[pts];[pts]crop=out_w=3381.4186868767238:out_h=1728:x=0:y=0[left];[pts]crop=out_w=74.58131312327646:out_h=1728:x=3381.4186868767238:y=0[right];[left][right]hstack=inputs=2[orientated];[1:v]scale=3456:1728[hs1];[hs1]colorkey=0x00ff00:0.8:0.1[hs1x];[orientated][hs1x]overlay[out] matches no streams.



This is how I'm trying to build the filter


     const filter = []

let init = '[0:v]'

if(node.video.playBackRate){

filter.push({filter: 'setpts',options: 1/node.video.playBackRate+'*PTS', inputs: init, outputs: '[pts]'})
init = '[pts]'
}

if(node.scene && node.scene.cameraDefault){
const theta = JSON.parse(node.scene.cameraDefault).rotationY
const per = height * (theta/180)
const left = height + per
const right = height - per

filter.push({filter: 'crop',options: {out_w: left, out_h: height, x: 0, y: 0}, inputs: init, outputs: '[left]'})
filter.push({filter: 'crop',options: {out_w: right, out_h: height, x: left, y: 0}, inputs: init, outputs: '[right]'})

filter.push({filter: 'hstack',options: {inputs : 2}, inputs: ['[left]','[right]'], outputs: '[orientated]'})
init = '[orientated]'
}

if(node.hotspots){

const overlays = [init]

node.hotspots.forEach((hotspot, index) => {
if(hotspot.render){

const options = {}

if(hotspot.startTime)
options['-ss'] = hotspot.startTime

if(hotspot.endTime)
options['-t'] = hotspot.endTime - (hotspot.startTime || 0)

node.ffmpeg.addInput(dir + '/' + hotspot.render)//.withInputOptions(options)

filter.push({filter: 'scale', options: `${width}:${height}`, inputs: `[${index + 1}:v]`, outputs: `[hs${index+1}]`})
filter.push({filter: 'colorkey', options: '0x00ff00:0.8:0.1', inputs: `[hs${index+1}]`, outputs: `[hs${index+1}x]`})
overlays.push(`[hs${index+1}x]`)
}
})

filter.push({filter: 'overlay', inputs: overlays, outputs: '[out]'})
}

node.ffmpeg.complexFilter(filter, '[out]')

Where am I going wrong?


I assume it's the right hand crop filter.. I need to somehow run those filters with the same input..



Answer



Don't know the syntax of fluent-ffmpeg, but I can identify the issue, You can't reuse filter outputs generated within the filtergraph. The method needed is to split the output, so the initial part of the filtergraph would look like this,


[0:v]setpts=0.3333333333333333*PTS,split=2[pts1][pts2];
[pts1]crop=out_w=3381.4186868767238:out_h=1728:x=0:y=0[left];
[pts2]crop=out_w=74.58131312327646:out_h=1728:x=3381.4186868767238:y=0[right];

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