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• avcodec/mpeg4videodec : Fix runtime error : signed integer overflow : 134527392 * 16...

  3 mars 2017, par Michael Niedermayer

  avcodec/mpeg4videodec : Fix runtime error : signed integer overflow : 134527392 * 16 cannot be represented in type ’int’
  This checks the sprite delta intermediates for overflow
  
  Fixes : 716/clusterfuzz-testcase-4890287480504320
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/mpeg4videodec.c

• How to add custom external video filter to ffmpeg at runtime ?

  9 décembre 2019, par alex

  Trying to build ffplay app that uses ffmpeg LGPL build with custom filter that I want to plug in during runtime. Differently from adding custom filter during compilation described scenario is not documented, thus tried to experiment. Tried executing avfilter_register and avfilter_graph_alloc_filter functions before avfilter_graph_parse_ptr with avfilter_graph_parse_ptr resulting in -22 return value (Invalid argument).

  Filter graph string : [in] split [T1], fifo, [T2] overlay=0:H/2 [out]; [T1] fifo, crop=iw:ih/2:0:ih/2, my_edgedetect=low=0.1:high=0.4 [T2]

  Lines added to configure_filtergraph function in ffplay.c :

          if ((ret = avfilter_register(&ff_vf_edgedetect)) < 0)
  
              goto fail;
  
          if ((ret = avfilter_graph_alloc_filter(graph, &ff_vf_edgedetect, ff_vf_edgedetect.name)) < 0)
  
              goto fail;

  Custom edge detect filter name (AVFilter.name) changed to my_edgedetect.

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  What is the proper way to register custom filter during runtime ?

  ---

  P.S.
  Same question on Zeranoa forum

• avcodec/mpegaudiodec_template : Fix runtime error : signed integer overflow : 2053224902...

  1er mars 2017, par Michael Niedermayer

  avcodec/mpegaudiodec_template : Fix runtime error : signed integer overflow : 2053224902 + 2053224902 cannot be represented in type ’int’
  Fixes : 696/clusterfuzz-testcase-5853632270434304
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/mpegaudiodec_template.c