[FFmpeg-user] insert a logo with transparency
Carl Eugen Hoyos
cehoyos at ag.or.at
Thu Jun 21 09:40:52 CEST 2012
Rossana Guerra <guerra.rossana <at> gmail.com> writes:
> Carl, first of all, I didn't cut/hide anything
So what you are saying is that the ffmpeg version on Ubuntu
does not show any header at all? No program name, no
copyright notice, no version information, instead output
starts with a warning ("Seems stream 0 codec frame rate ...")?
In this case, I am very sorry, I didn't use Ubuntu for a long
time and I could not imagine they would change the default
output so much.
Note that in this post, your output looked different:
> , it has no sense (and it would be foolish) if I want to
> solve this problem or doing it in the correct manner.
> I have been polite in my posts.
> Maybe is the version of FFMpeg running on Ubuntu 12,
> it wasn't intentional at all.
You are misunderstanding:
I did not want to imply that you intentionally installed a
broken version of FFmpeg, I wanted to explain that Ubuntu
tries to force you (intentionally) to use a severely broken
version of FFmpeg that - among hundreds of other bugs -
contains some bugs that look security relevant (iow: a
version that may have several security issues).
For that reason, Jon Severinsson kindly provides working
FFmpeg binaries for Ubuntu, you will find the link on
> (If you want I can attach an image of the console output).
> Apart of the FFmpeg version, is this the correct command?
I don't think so, because as explained, FFmpeg currently
installed on your computer does not support alpha in bmp.
If it works for png, there is absolutely no reason to
assume it wouldn't work for bmp, if it doesn't, there may
be a bug. Allow me to repeat that one could argue bmp
never contains alpha information but since both Gimp and
ImageMagick support it, I believe it makes sense that
FFmpeg also assumes alpha in bmp.
You should be able to convert your png (with alpha) to a
bmp with alpha with
$ convert alpha.png alpha.bmp
$ ffmpeg -i alpha.png alpha.bmp
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