[FFmpeg-user] momentary overlay using ffmpeg
stefasab at gmail.com
Mon May 19 10:37:59 CEST 2014
On date Monday 2014-05-19 13:54:07 +0530, tarun singhal wrote:
> On Mon, May 19, 2014 at 1:32 PM, tarun singhal <tsinghal18 at gmail.com> wrote:
> > Hi Group,
> > When using overlay or drawtext filter, I see that it applies overlay/text
> > over complete length of video.
> > I have a requirement where I want to put an overlay or draw text on source
> > video, but the overlay should appear only from lets says start time code:
> > 00:02:00 and should remain there till 00:02:10
> > So, basically having overlay only for 10 seconds in the source video?
> > Is this possible to do with ffmpeg?
> > I was able to figure out the command to do Draw text for momentarily-
> Below is the sample command might come handly. Working to get Overlay
> working like this
> ffmpeg -i output.mpg -s 640x360 -filter_complex
> -acodec copy -r 30 check.mpg
There is the timeline feature which is supposed to do exactly that:
you enable it with something like enable=between(t, 120, 130).
Check the output of ffmpeg -filters to see which filters support
Supporting smooth alpha transitions is not possible at the moment (at
least not without some creative filter chaining).
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