1. To achieve logo appear alternately every 10 seconds
ffmpeg -y -t 60 -i input.mp4 -i logo1.png -i logo2.png -filter_complex "overlay=x=if(lt(mod(t\,20)\,10)\,10\,NAN ):y=10,overlay=x=if(gt(mod(t\,20)\,10)\,W-w-10\,NAN ) :y=10" output.mp4
When the 60-editing video, fill out only if the video processing and output the first 60 seconds, do not fill the entire video will handle
x x coordinate of the upper left corner of the watermark
y y coordinate of the upper left corner of the watermark
input.mp4 input video files (need to be addressed a)
output.mp4 output from the video file (the processing has been completed)
IF (gt (MOD (T, 20 is), 10), 10-Ww, from NAN) the length of said second logo 10 appears, that is the watermark It will display for 10 seconds
2. To achieve Marquee
ffmpeg -i input1 -i input2 -vcodec libx264 -an -filter_complex "overlay=x='if(gte(t,2), -w+(t-2)*20, NAN)':y=0" -s 320x240 output.mp4
on the bottom of the video input1
input2 video on top of
the width and height of the output video 320x240
3. logo achieved two seconds moves from left to right
ffmpeg -i input.mp4 -vf "movie=logo.png[logo];[in][logo]overlay=x='if(gte(t\,2)\,((t-2)*80)-w\,NAN)'" output.mp4
80 from movement in pixels
4. Implement logo gif format command cycle
ffmpeg -i video.mpg -ignore_loop 0 -i loop.gif -filter_complex "[0:v][1:v]overlay=10:10:shortest=1" -vcodec mpeg2video out.mpg
5. Add captions for video
ffmpeg -i input -vf drawtext=fontfile=arial.ttf:text=welcome output
6. Implement periodic display of the input text watermark
ffmpeg -i input.mp4 -vf "drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf:text='testtest':x=w-100:y=100:enable=lt(mod(t\,3)\,1):fontsize=24:[email protected]:shadowy=2" output.mp4
7. Write code has encountered an error
Cannot create buffer sink ret = -12
修改
AVFilter *buffersrc = avfilter_get_by_name("buffer");
AVFilter *buffersink = avfilter_get_by_name("buffersink");
