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• How to use ffmpeg make a video from one still image with height from 0 to 100% animation

  28 août 2021, par Xiang Chen

  I want use a still image to make a transparent webm video, this video needs to have the following style :

  


  

  1. the image height auto increase from 0 to 100% in specific time.

  


  2. I don't want scroll effect , what i want is just like the image spread from top to bottom

  


  


  below is my demo image

  


  Please help me , thanks a lot

  


• ffmpeg live streaming for twitch has audio delay

  8 avril 2019, par ILoveCake

  I am relatively new to ffmpeg and live streaming.
  Trying to overlay some videos and an audio stream.
  One of the audio streams is delayed for about 2 seconds.

  Here are the details :

  stream 0 : video : a static background image

  stream 1 : video : an area of the screen recorded

  stream 2 : video : webcam video

  stream 3 : audio : webcam audio

  AREA_X=1024; AREA_Y=576; OFFSET_X=110; OFFSET_Y=145
  
  
  
  ffmpeg \
  
    -async 1 -vsync 1 \ 
  
    -loop 1 -i /home/helmi/Documents/Streaming.Chess.png \
  
    -thread_queue_size 512 -f x11grab -s ${AREA_X}x${AREA_Y} -framerate 25 -async 1 -vsync 1 -i :0.0+${OFFSET_X},${OFFSET_Y} \
  
    -thread_queue_size 512 -f v4l2 -framerate 25 -video_size 160x120 -i /dev/video0 \
  
    -thread_queue_size 512 -f pulse -ac 2 -ar 48000 -i default \
  
    -filter_complex \
  
    "color=0x336699cc:1024x64, drawtext=textfile=/home/helmi/Documents/Streaming.Chess.txt:fontfile=/home/helmi/.fonts/PersonalUse_Clipper_Script_fat.ttf:x=10:y=16:fontsize=40:fontcolor=white [bottom]; \
  
     [1:v]scale=960:-1,setpts=PTS-STARTPTS [a]; \
  
     [0:v]setpts=PTS-STARTPTS [0v]; \
  
     [0v][a]overlay=15:15 [b]; \
  
     [b][2:v]overlay=(W-w):0 [c]; \
  
     [c][bottom]overlay=0:H-64 [video]" \
  
     -map "[video]" -map "3:a" \
  
      -async 1 -vsync 1 \ 
  
      -c:v libx264 -b:v 500k -maxrate 500k -bufsize 1000k -framerate 25 -crf 17 -preset superfast -pix_fmt yuv420p -tune zerolatency \
  
        -force_key_frames "expr:gte(t,n_forced*2)" \
  
      -c:a aac -b:a 256k -ac 2 -af "aresample=async=1" \
  
    -f flv rtmp://live-vie.twitch.tv/app/...

  Am I missing something here ? Any help is appreciated.

• ffmpeg - recode to lower bitrate + remove audio + watermark

  26 avril 2014, par Ove Sundberg

  I’m a complete noob to ffmpeg and I’m trying to do a couple of things in the same call :

  1) recode a video to a lower bitrate

  2) remove audio

  3) add a watermark center bottom

  4) save output as .webm

  With a bit of RTFM and scouring for examples I have managed to achieve of 1, 2 and 4 with :

  ffmpeg -i hires.mp4 -c:v libvpx -crf 10 -b:v 128k -r 24 -an -c:a libvorbis output-file.webm

  This call adds a watermark center bottom :

  ffmpeg -i hires.mp4 -i watermark.png -filter_complex "overlay=main_w/2-overlay_w/2:main_h-overlay_h-10" output-file.webm

  Now I struggle to combine the two. The second -i option is the watermark. Therefore I would have thought that

  ffmpeg -i hires.mp4 -c:v libvpx -crf 10 -b:v 128k -r 24 -an -c:a libvorbis -i watermark.png -filter_complex "overlay=main_w/2-overlay_w/2:main_h-overlay_h-10"  output-file.webm

  would do the trick. It does not off course, the error I get is

  Option b:v (video bitrate (please use -b:v)) cannot be applied to input file watermark.png -- you are trying to apply an input option to an output file or vice versa. Move this option before the file it belongs to. Error parsing options for input file watermark.png. Error opening input files: Error number -22 occurred

  So I have the options all messed up. I’ve tried moving the options around but with no luck. I’d really appreciate some help here.