[FFmpeg-user] Sliding text banner (was: Newbie questions)
nicolas.george at normalesup.org
Sat Jul 21 11:08:02 CEST 2012
Le tridi 3 thermidor, an CCXX, Orbisoft Support a écrit :
> - I need to remove the ./
I ran ffmpeg from my build tree.
> - Use ffmpeg instead of ffmpeg_g
I frequently only build ffmpeg_g to gain some time.
> - Use ascent" rather than ascent'
My bad, I must have changed the quotes inconsistently when rewrapping for
> 2) On my original command string, I did change the output file to FLV and as
> a result was able to use a frame rate of 80 frames per second which mad it
> c:\mytemp\ffmpeg -r 80 -y -f image2 -i f:\mytemp\images\image%d.png
FLV is very not a good choice, especially since you do not set any encoding
Since this is an intermediary video, you should go for lossles:
ffmpeg -i image%d.png -c copy images.mkv
It will be faster and preserve the full quality of the overlay.
You can also try lossless H.264:
-c libx264 -crf 0 -pix_fmt yuv444p
It will take more time, but hopefully produce a smaller file.
> 3) So using the method you mentioned I take it I would only need to add one
> frame in total (the black rectangle) then the text would just scroll on
> that? The blank frame is at: http://www.orbisoft.com/ffmpeg/image1.png
With drawtext, you do not need to add anything, you put the text directly on
the video where you need it.
> 4) Would you be kind enough to tell me what the command line should be in
> light of those parameters? I am hoping the file size of the resultant flv
> created using your mentioned methodolgy may somehow be less than the 110 MB
> for the full FLV I created by adding 100,000 or so png frames.
This is hard to predict.
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