[FFmpeg-user] multiple drawtext parameters

mromey mikeromey at gmail.com
Sat May 28 15:59:04 CEST 2011

Hi Stefano,

Thanks for the great direction.

I am pretty sure I attempted to do multiple drawtext filters the way you outlined without much luck.  I will try again.  Could be that I need a newer build of ffmpeg.  Will check it out. 

As for the frame counter variable.  One suggestion would be to adopt a variable commonly used in compositing  packages.  They use %04d.  This designates a padded number with 4 digits.

Would love to contribute to ffmpeg.  At this point I have only been using pre compiled builds of ffmpeg.  I don't do all that much C++ coding.  Really focus my development on python.  I will investigate the source and see how approachable the code is.  Otherwise where would I make a request to consider future concatenation filters additions?

Thanks again for the direction.


Sent from my iPhone

On May 27, 2011, at 3:26 PM, "Stefano Sabatini [via FFmpeg-users]"<ml-node+3556543-1415366951-240817 at n4.nabble.com> wrote:

> On date Friday 2011-05-27 06:14:20 -0700, mromey encoded:
> > Want to use ffmpeg to publish quickTimes and thumbnails for our asset 
> > management system.  Evaluating how viable ffmpeg would be as a replacement 
> > to our current system.  In the past I have done it lots of different ways. 
> > I have used After Effects, Nuke, RVIO, python and pil.  Thus far I am 
> > impressed with ffmpeg but having some difficulty with some parameters.   
> > Exploring the drawtext filter.  I have the following example. 
> > 
> > ffmpeg.exe -i C:/temp/input.mov -vf drawtext="arial.ttf=':text='TEST'" 
> > C:/temp/output.mov 
> > 
> > Have a few questions: 
> > 
> > 1.  Is it possible to process multiple drawtext in the same IO stream.  I 
> > would rather load the movie or image sequence once into memory once then 
> > apply each drawtext overlay rather than process the addition of each 
> > drawtext and load the file each time.  If this is possible can somebody help 
> > by showing me the syntax.
> You can put different drawtext filter in sequence: 
> -vf drawtext=text="text1",drawtext=text="text2",... 
> > 2.  One of the drawtext burn ins needs to be a frame counter.  Is it 
> > possible to send some type of internal variable/flag to the value of text 
> > that would use the frame number in lieu of static text? 
> It is possible but we have yet to find a syntax for doing it in an 
> extensible way. 
> > 3.  Was hoping to get some direction as to how I would take a single frame 
> > slate file and append it to a quicktime via ffmpeg. 
> That would be a concatenation filter, yet to be 
> implemented/integrated, patches are welcome, in alternative file a 
> feature requests (and sponsorships are welcome as well). 
> > Thanks for the help in advanced. 
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