How do I use ffmpeg's -filter_complex

Question

I have two promises:

getToken() //:get a CSFR cookie from the server

and

getUseraData() //:get user data, but it need the cookie get from getToknen() otherwise server respond with an error.

So, I know that I can do this in my controller:

getToken().then(function (result) {
    getUserData(result);
});

But I know that it is not so good to run a promise inside a promise.

So: how can I exec the getUserData() promise only after that getToken is terminard and a value is returned?

Solution

Too old

Your version is way too old, and in fact I don't think it even supports any filters if I recall correctly. You can check with ffmpeg -filters.

Get a new ffmpeg

To get a recent version you can compile ffmpeg or simply download a static build. Users of Ubuntu 15.04 or newer can just install ffmpeg from the repository.

Example command

This example will:

1. Place video1.mp4 20 pixels down and 40 pixels over.
2. Place video2.mp4 in the middle.

3. Combine audio from video1.mp4 and video2.mp4.

   ffmpeg -i bg.mp4 -i video1.mp4 -i video2.mp4 -filter_complex \
   "[0:v][1:v]setpts=PTS-STARTPTS,overlay=20:40[bg]; \
    [bg][2:v]setpts=PTS-STARTPTS,overlay=(W-w)/2:(H-h)/2[v]; \
    [1:a][2:a]amerge=inputs=2[a]" \
   -map "[v]" -map "[a]" -ac 2 output.mp4
   

Also see

• overlay filter documentation
• Superimposing two videos onto a static image? for detailed descriptions for each overlay option

Comments

[Phil]

"But I know that it is not so good to run a promise inside a promise" ~ got a reference to this?

[rtucker88]

If you don't want to nest the anonymous function you can do getToken().then(getUserData); I'm not too sure what you're asking about though.

[dlock]

why dont you use chained promises like promise.then().then()

[llogan]

You must be using a super old ffmpeg. Your solution should be a last resort if you are unable to upgrade.

[Admin]

@llogan No I should