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Transparency support #2

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Transparency support #2

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5ccc1af
Updated to PNG image stream and libvpx video codec.
maxschmeling Dec 6, 2016
6ed94df
Returning Promise for FFmpeg process close from end method.
maxschmeling Dec 6, 2016
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19 changes: 11 additions & 8 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -16,11 +16,11 @@ function createMovieRecorderStream (win, options_) {
'-y',
'-f', 'image2pipe',
'-r', '' + (+fps),
// we use jpeg here because the most common version of ffmpeg (the one
// that ships with homebrew) is broken and crashes when you feed it PNG data
// https://trac.ffmpeg.org/ticket/1272
'-vcodec', 'mjpeg',
'-i', '-'
'-i', '-',
'-c:v', 'libvpx',
'-auto-alt-ref', '0',
'-pix_fmt', 'yuva420p',
'-metadata:s:v:0', 'alpha_mode="1"'
]

var outFile = options.output
Expand All @@ -38,6 +38,7 @@ function createMovieRecorderStream (win, options_) {
}

var ffmpeg = spawn(ffmpegPath, args)
var ffmpegClosePromise = new Promise(resolve => ffmpeg.on('close', resolve))

function appendFrame (next) {
// This is dumb, but sometimes electron's capture fails silently and returns
Expand All @@ -46,11 +47,12 @@ function createMovieRecorderStream (win, options_) {
function tryCapture () {
try {
win.capturePage(function (image) {
var jpeg = image.toJpeg(100)
if (jpeg.length === 0) {
var png = image.toPNG()

if (png.length === 0) {
setTimeout(tryCapture, 10)
} else {
ffmpeg.stdin.write(jpeg, function (err) {
ffmpeg.stdin.write(png, function (err) {
next(err)
})
}
Expand All @@ -64,6 +66,7 @@ function createMovieRecorderStream (win, options_) {

function endMovie () {
ffmpeg.stdin.end()
return ffmpegClosePromise
}

var result = {
Expand Down