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• avfilter/af_agate : Honour query_formats API, fix segfault

  21 septembre 2021, par Andreas Rheinhardt

  avfilter/af_agate : Honour query_formats API, fix segfault
  The sidechaingate filter wants its main input and its (only) output
  
  to have the same channel layout and number of channels ; yet it does
  
  not link them in its query_formats callback. Instead it sets the
  
  outlink to only accept the first offered choice for the main input's
  
  channel layout and then sets both inputs to independently accept
  
  any channel counts. The config_output callback then overwrote the
  
  outlink's channel layout and channels properties with the main input's,
  
  even though they may differ in case the first offered choice for
  
  the main input's channel layout turns out not to be the final one.
  Consider e.g. the following filtergraph :
  
  [in]aformat=channel_layouts=mono,aformat=channel_layouts=stereo|mono[out] ;\
  
  [out][in2]sidechaingate,stereotools
  
  The two aformats ensure that the first offered channel layout (stereo)
  
  will not be chosen for the input ; yet it is the only offered channel
  
  layout for the output of sidechaingate and will therefore be chosen
  
  by the query_formats framework. Because the sidechaingate outputs
  
  interleaved doubles which stereotools expects the output of
  
  sidechaingate appears to be suitable as input for stereotools without
  
  further conversions. Yet stereotools actually only receives a mono frame
  
  and therefore overreads its input buffer which leads to segfaults ;
  
  it can also lead to heap corruption because there can be writes beyond
  
  the end of the buffer, too.
  Fix this by linking the channel layouts of the main input and the output
  
  in query_formats and remove the code overwriting it in config_output.
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavfilter/af_agate.c

• Wipe image in and out with ffmpeg / imagemagick

  29 septembre 2017, par alexschomb

  I’d like to create a wipe in/out from left to right effect with ffmpeg and/or ImageMagick that is common to most video editors. (e.g. Adobe Premiere, Final Cut Pro and even OpenShot) Some might call this a slide in/out transition effect.

  I found that ffmpeg has a lot of filters (including fades), but none seem to be the correct choice for this.

  There are also ImageMagick transitions that achieve a wipe in effect. Like in the following example (that is derived from here) :

  convert overlay.png -crop 10x1080 miff:- | convert - out.gif

  But I found it hard to control the actual speed/duration of the transition. I’d like it to last only 2.5 seconds. But I can’t make it that fast, because the -delay 1x30 option doesn’t seem to let me decrease the delay that low. There is also a library with ImageMagick transitions here that unfortuantely isn’t compatible with batch.

  I suppose there is a solution for ffmpeg that I couldn’t think of, yet. I’d really appreciate your advice !

• Evolution #3775 : Moins de cookies

  26 avril 2016, par jluc -

  Ça concerne gandi à l’origine, mais en ayant une politique pâtissière plus "générique", SPIP aura a priori plus de chance de bénéficier des varnish d’un plus grand nombre d’hébergeurs.