[FFmpeg-user] multiple drawtext parameters
mikeromey at gmail.com
Sat May 28 15:59:04 CEST 2011
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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