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• avfilter/vf_alphamerge : Fix double-free of AVFilterFormats on error

  7 août 2020, par Andreas Rheinhardt

  avfilter/vf_alphamerge : Fix double-free of AVFilterFormats on error
  The query_formats function of the alphamerge filter tries to allocate
  
  two lists of formats which on success are attached to more permanent
  
  objects (AVFilterLinks) for storage afterwards. If attaching a list
  
  to an AVFilterLink succeeds, the link becomes one of the owners of
  
  the list. Yet if attaching a list to one of its links succeeds and
  
  an error happens lateron, both lists were manually freed, which is wrong
  
  if the list is already owned by one or more links ; these links' pointers
  
  to their lists will become dangling and there will be a double-free/use-
  
  after-free when these links are cleaned up automatically.
  This commit fixes this by removing the custom freeing code ; this will
  
  temporarily add a leaking codepath (if attaching a list not already
  
  owned by a link to a link fails, the list will leak), but this will
  
  be fixed soon by making sure that an AVFilterFormats without owner will
  
  be automatically freed when attaching it to an AVFilterLink fails.
  
  At most one list leaks because as of this commit a new list is only
  
  allocated after the old list has been successfully attached to a link.
  Reviewed-by : Nicolas George <george@nsup.org>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavfilter/vf_alphamerge.c

• avcodec/jpeg2000dec : Free packed_headers

  13 mai 2020, par Michael Niedermayer

  avcodec/jpeg2000dec : Free packed_headers
  Fixes : memleak
  
  Fixes : 21784/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-565256551058636
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Reviewed-by : Gautam Ramakrishnan <gautamramk@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/jpeg2000dec.c

• Assistance required with filter graph construction(fast motion between times)

  6 janvier 2023, par D-MAN

  I am trying to re-create the following video, using ffmpeg.
https://youtu.be/eVQ9ysp0Pj0. "please check 0.19 minute for examples"
I have the following line of code which has most of the elements, except the part where is applies fast motion for 1s at certain outputs([vfr1][vfr2][vfr3])/times. currently it is only setpts=0.5*PTS[vboom] for the entire length of the video.

  


  exe = "-i " + file + " -i " + frame + " -i " + framestart + " -i " + frameEnd + " -i " + audioOverlay + " -filter_complex \"[0:v]pad="+mVideoWidth+":"+mVideoHeight+":576:0[vpad]; [vpad][1]overlay[vframed]; [vframed]split=3[vfr1][vfr2][vfr3]; [vfr1]reverse[vrev]; [vfr2][vrev][vfr3]concat=n=3,setpts=0.5*PTS[vboom]; [vboom][2]overlay=enable='lte(t,2)'[vpreout]; [vpreout][3]overlay=enable='gte(t,"+msec+"*3*0.5-2)' \" -map 4:a -b:v 8000k -shortest -preset ultrafast -crf 23 " + file2.getAbsolutePath();

  


  i have tried the following code snippets in various sections of the filter graph, with no luck !

  


  //[0:v]trim=0:2,setpts=PTS-STARTPTS[v1] ;[0:v]trim=2:5,setpts=2*(PTS-STARTPTS)[v2] ;[0:v]trim=5,setpts=PTS-STARTPTS[v3] ;
//[0:v]trim=0:10,setpts=PTS-STARTPTS[vfr1] ;[0:v]trim=10:30,setpts=PTS-STARTPTS[vfr2] ;[0:v]trim=start=30,setpts=PTS-STARTPTS[vfr3] ;
//[0:v]trim=2:3,setpts=0.75*(PTS-STARTPTS) ; [0:v]trim=4:5,setpts=0.75*(PTS-STARTPTS) ; [0:v]trim=7:8,setpts=0.75*(PTS-STARTPTS) ;
//[0:v]select='between(t,1,4)+between(t,4,6)',setpts=0.87*PTS ;