Pass ffmpeg’s stdout and stderr to ffmpegerror event

[dtinth]

playwright-video/src/VideoWriter.ts

Lines 48 to 61 in 5803769

	.on('error', (e) => {
	this.emit('ffmpegerror', e.message);
	// do not reject as a result of not having frames
	if (
	!this._receivedFrame &&
	e.message.includes('pipe:0: End of file')
	) {
	resolve();
	return;
	}
	reject(`pw-video: error capturing video: ${e.message}`);
	})

fluent-ffmpeg sends the stdout and stderr, so our error handler can accept this:

-        .on('error', (e) => {
+        .on('error', (e, stdout, stderr) => {

This helps with some obscure edge cases like this:

[libx264 @ 0x648b540] width not divisible by 2 (1045x730)
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!

The first line which shows the culprit isn’t present in any output generated by playwright-video and DEBUG='pw-video:*'. I had to dig in and make it print the stderr so I can see the real reason.