Pushing ip camera stream to live video url with scrolling text and scrolling logo using ffmpeg

In this blog I am going to explain how to scroll the logo on top of the screen as well as text in the middle of the screen. As I have explained the input will be our live video source or ip camera stream and output also will we another live video source.

Lets see the command :

 ffmpeg -thread_queue_size 32 -rtsp_transport tcp -i rtsp://admin:[email protected]:554/h264/ch1/main/av_stream -framerate 25 -i /home/oodles/Desktop/logo.png -filter_complex "[0:v][1:v]overlay=x=(mod(3*n\,main_w+overlay_w)-overlay_w):10" -f flv pipe:1 | ffmpeg -i pipe:0 -vf "drawtext=text=oodlestechnologies :fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf: y=((h)/2):x=(mod(5*n\,w+tw)-tw): fontcolor=red: fontsize=40: shadowx=-5: shadowy=-15" -vcodec libx264 -acodec aac -f flv -muxdelay 0.1 rtmp://oodles:[email protected]:1935/live-demo/mstream
 

Explanation of command:

• -thread_queue_size -  Allow to set the thread message queue size, here 32

• -rtsp_transport -  Set RTSP transport protocols, here tcp

• -i - specifies the input file stored in local disk or live audio/video source.

• rtsp://admin:[email protected]:554/h264/ch1/main/av_stream - input live camera ip

• -framerate -  Set the framerate, here 25 fps. You can also use -r instead of -framerate

• -filter_complex - to recognize filtergraph

• [0:v][1:v]overlay=x=(mod(3*n\,main_w+overlay_w)-overlay_w):10 - [0:v] is our main input, rtsp://admin:[email protected]:554/h264/ch1/main/av_stream

  [1:v] is our overlay input, here /home/oodles/Desktop/logo.png.

  overlay=x=(mod(3*n\,main_w+overlay_w)-overlay_w):10- means we want to scrolling position of logo to the left and 10px down, originating from the top left corner.

  now,

  n is number of input frames starting from 0.

  main_w is the main input width.

  overlay_w is the second (logo) input width. here what we are doing is for each frame we are calculating x axis

• -f - output file format, here flv

• pipe:1 - it is for stdout (standard output)

• | - To connect two command together so that the output of one program becomes the input of the next program

• pipe:0 - it is for stdin(standard input).

• -vf - video filter

• -drawtext - Draw a text string or text from a specified file on top of a video

• text - text which you want to add on video

• fontfile - the font of text

• x=(mod(5*n\,w+tw)-tw):y=(h/2)

  here

  n is number of input frames starting from 0

  w is the main input width.

  tw is the rendered text width  

  h height of screen

• fontsize - the size of font

• fontcolor - color of text

• shadowx - x axis,shadow on text

• shadowy - y axis,shadow on text

• -vcodec -  Set the video codec. This is an alias for -codec:v , here libx264.

• -acodec - set the audio codec ,here audio codec is aac

• -muxdelay - Set the maximum demux-decode delay in secs. here 0.1 sec

• rtmp://oodles:[email protected]:1935/live-demo/mstream - the target url where we pushed the video. oodles:oodles is username and password of wowza.