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• avfilter/vf_signature : Avoid cast from function pointer to void*

  25 août 2020, par Andreas Rheinhardt

  avfilter/vf_signature : Avoid cast from function pointer to void*
  The signature filter uses qsort, but its compare function doesn't have
  
  the signature required of such a function ; therefore it casts the
  
  function pointer to void. Yet this is wrong :
  
  C90 only guarantees that one can convert a pointer to any incomplete
  
  type or object type to void* and back with the result comparing equal
  
  to the original which makes pointers to void generic pointers to
  
  incomplete or object type. Yet C90 lacks a generic function pointer
  
  type.
  
  C99 additionally guarantees that a pointer to a function of one type may
  
  be converted to a pointer to a function of another type with the result
  
  and the original comparing equal when converting back.
  
  This makes any function pointer type a generic function pointer type.
  
  Yet even this does not make pointers to void generic function pointers.
  Both GCC and Clang emit warnings for this when in pedantic mode.
  This commit fixes this by modifying the compare function to comply with
  
  the expected signature.
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavfilter/vf_signature.c

• lavu/hwcontext_d3d : Cast src pointers calling av_image_copy*().

  18 avril 2019, par Carl Eugen Hoyos

  lavu/hwcontext_d3d : Cast src pointers calling av_image_copy*().
  Silences several warnings :
  
  libavutil/hwcontext_d3d11va.c:413:49 : warning : passing argument 3 of ‘av_image_copy’ from incompatible pointer type
  
  libavutil/hwcontext_d3d11va.c:425:47 : warning : passing argument 3 of ‘av_image_copy’ from incompatible pointer type
  
  libavutil/hwcontext_dxva2.c:351:45 : warning : passing argument 3 of ‘av_image_copy’ from incompatible pointer type
  
  libavutil/hwcontext_dxva2.c:382:52 : warning : passing argument 3 of ‘av_image_copy_uc_from’ from incompatible pointer type
  

  • [DH] libavutil/hwcontext_d3d11va.c
  • [DH] libavutil/hwcontext_dxva2.c

• How can I connect drawtext to filter complex for change logo size ?

  19 novembre 2016, par parsa

  I want to have a text and a logo on video. for this I used below code.
  I want to change size of logo by scale2ref,but I don’t know how can I connect scale2ref with drawtext.

    ffmpeg -i 4k.mp4 -i http://test.ir/LogoPath/VideoLogo.png?v
  
      =C7Xfha6ri0yut2x9a5XpIA -filter_complex [0:v]drawtext=fontfile=OpenSansRegular.ttf:text=parsa:fontcolor=white:box=1:r=25:boxcolor=black@0.3:boxborderw=3:fontsize=85:x=85:y=(h-text_h-85)[text];[text][1:v]scale2ref=-1:120[0v]
  
      [logo];[logo][0v]overlay=W-w-85:85[v] -map [v] -map 0:a out1.mp4

  top code return this error :

  [libx264 @ 00000000004ea0c0] width not divisible by 2 (271x120)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  This below code works when I don’t use scale2ref and the video output has logo with defualt size and the text.

    ffmpeg -i 4k.mp4 -i http://test.ir/LogoPath/VideoLogo.png?v
  
      =C7Xfha6ri0yut2x9a5XpIA -filter_complex [0:v]drawtext=fontfile=OpenSansRegular.ttf:text=parsa:fontcolor=white:box=1:r=25:boxcolor=black@0.3:boxborderw=3:fontsize=85:x=85:y=(h-text_h-85)[text];[text][1:v]overlay=W-w-85:85[v] -map [v] -map 0:a out1.mp4

  How can I connect drawtext to filter complex for change logo size ?