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• Revision b6a3062d81 : Fix incorrect comparison of frame size The width and height stored in the refer

  28 février 2013, par John Koleszar

  Changed Paths : Modify /vp9/encoder/vp9_onyx_if.c Fix incorrect comparison of frame size The width and height stored in the reference frames are padded out to a multiple of 16. The Width and Height variables in common are the displayed size, which may be smaller. The incorrect comparison was (...)

• FFMPEG api avformat_find_stream_info does not provide width and height of stream when decoders are disabled

  9 novembre 2022, par Raghavendra Ganiga

  We are using FFMPEG library and we have disabled decoders, demuxers using following using compile time options

  


  --disable-decoders
--disable-demuxers
--enable-demuxer=mov
--enable-demuxer=matroska
--enable-demuxer=mpegts


  


  After putting above options while compilation, we are not getting width and height of video stream using avformat_find_stream_info() API

  


  we do following api sequence to get stream information

  


     avformat_open_input();

  


  then we call

  


  avformat_find_stream_info(format_context, nullptr);

  


  to get stream information, when we try to get width/height of stream we get always zero

  


  format_context->streams[0]->codecpar->width always gives zero

format_context->streams[0]->codecpar->height always gives zero


  


  Is there any other way to get width and height of the stream ?

  


• drawbox around text with dynamic height in ffmpeg

  9 mars 2018, par Anuj TBE

  I’m working on a ffmpeg script to draw text over image/video.

  The text will be wrapped inside a box with full width and dynamic height.

  I have tried two approach to achieve this.

  1. using drawbox

  ffmpeg \
  
  -loop 1 -i /path_to_file/file.jpg \
  
  -t 5 -vf
  
  "scale=320:320,\
  
  drawbox=y=0\
  
  :color=#00FF29\
  
  :width=iw\
  
  :height=72\
  
  :t=max,\
  
  drawtext=text=TBE\
  
  :fontcolor=#F71DFF\
  
  :fontsize=82:x=(w-text_w)/2\
  
  :y=text_h/2" 
  
  /path_to_file/new_file.mp4 -y

  Which renders following three examples with different value of fontsize

  

  2. using box of drawtext

  ffmpeg -i in3.png -t 5 -vf drawtext=" \
  
  text='Stack Overflow': fontcolor=white: fontsize=54: box=1: boxcolor=black@0.5: \
  
  boxborderw=10: x=(w-text_w)/2: y=(h-text_h)/2" -codec:a copy output_new.mp4

  

  Half of the requirement is being fullfiled by drawbox (full width box) and half using drawtext box (box height according to text).

  How can I achieve both (full box width with dynamic height according to height of text) in ffmpeg ?