ffmpeg.js to create mp4 from Canavas frames and transcode it

Question

I am looking to use ffmpeg or ffmpeg.wasm inside a Vue serverless SPA which at the moment uses GIF.js. The app creates HTMLCanvasElement dynamically and adds them as frames to the GIF object which is then made available for download and in the case of ffmpeg the option to transcode it to another format, say .gif. Ideally I want to do the same with ffmpeg. My question is more how to integrate ffmpeg in my context and how to replace my gif.addFrame(composedCnv, { delay: delayInput }); with a await ffmpeg.run( ... );command?

async createGIFHandler ( layer , addAllTitles , quality , delay , range ) {
    ...
    var tempGIF = new GIF({
        workers: 4,
        quality: quality,
        height: this.mapHeight + this.infoCanvas.height,
        width: this.mapWidth,
        workerScript: 'gif.worker.js'
    });
    let progressCounter = 1;
    for ( let i = range[0] ; i < range[1] ; i++, progressCounter++ ) {
        this.setDateTime( driver , driverDA[i] );
        for ( let j = 0 ; j < visibleLayers.length ; j++ ) {
            if ( visibleLayers[j].get('layerName') !== layer.Name  ) {
                var tempDA = visibleLayers[j].get('layerDateArray');
                for ( let k = 0 ; k < tempDA.length ; k++ ) {
                    if ( driverDA[i].getTime() === tempDA[k].getTime() ) {
                        this.setDateTime( visibleLayers[j] , tempDA[k] );
                    }
                }
            }
        }
        await new Promise(resolve => this.map.once('rendercomplete', resolve));
        await this.composeCanvas( tempGIF , driverDA[i] , visibleLayers , delay , widths )
        this.$store.dispatch('Layers/setGIFPercent', Math.round(((progressCounter / gifLength) * 100)))
    }

    tempGIF.on('finished', (blob) => {
        const tempURL = URL.createObjectURL( blob )
        this.$store.dispatch( 'Layers/setGIFURL' , tempURL )
        console.log('GIF Finished');
    });
    tempGIF.render();
},
async composeCanvas( gif , timeStep , visibleLayers , delayInput , widths ) {
    const mapCnv = this.getMapCanvas();
    await this.updateInfoCanvas( timeStep , widths )
    const composedCnv = await this.stitchCanvases( mapCnv , visibleLayers.length );
    await new Promise((resolve) => {
        gif.addFrame(composedCnv, { delay: delayInput });
        resolve();
    })
},