[FFmpeg-user] MacOSX Output Question

[Richard Milewski]

OK... if I add an explicit -i ahead on input.mpr it works in both ffmpeg and ffplay: 

ffplay -i input.mp4 -vf movie=logo.png,[in]overlay 

and... 

ffmpeg -i input.mp4 -vf movie=logo.png,[in]overlay test.mp4 

Still no joy trying to make the SDL output device work on MacOSX though. 

...off to re-read the section on filter chains and filtergraphs in Frantisek Korbel's book! 

Many thanks for all the patient help for a noob! 

-- Richard 


----- Original Message -----

From: "Richard Milewski" <richard at mozilla.com> 
To: "FFmpeg user questions" <ffmpeg-user at ffmpeg.org> 
Sent: Sunday, August 17, 2014 5:20:53 PM 
Subject: Re: [FFmpeg-user] MacOSX Output Question 

Thanks for the help Carl. 

~ ffplay input.mp4 -vf movie-logo.png,[in]overlay does show overlay correctly, 

...but if I try the same line with ffmpeg: 

~ ffmpeg input.mp4 -vf movie-logo.png,[in]overlay output.mp4 

It fails in a strange way by trying to over-write the input.mp4 file? 

I clearly don't understand that syntax (Back to the docs!). 

Sadly, OSX only shows me one output device (SDL), and that fails with *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Error (1000) creating CGSWindow on line 263' whenever I try to use it with a -f. Without the -f, FFmpeg tells me sdl is an invalid argument. 

Lots to learn yet, I guess. 

-- Richard 


----- Original Message ----- 

From: "Carl Eugen Hoyos" <cehoyos at ag.or.at> 
To: ffmpeg-user at ffmpeg.org 
Sent: Sunday, August 17, 2014 4:50:33 PM 
Subject: Re: [FFmpeg-user] MacOSX Output Question 

Richard Milewski <richard <at> mozilla.com> writes: 

> ffplay -i input.mp4 -i logo.png -filter_complex overlay 

$ ffplay input.mp4 -vf movie=logo.png,[in]overlay 

Or you use one of the several video output devices 
that are listed with "ffmpeg -devices". 
(The number might be limited on osx, note that they 
are video-only, if you use an audio output device 
at the same time, you might get A/V sync problems.) 

Carl Eugen 

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