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• avformat/rtsp : Set port_off to zero for low min/max port range

  4 juillet 2021, par Andriy Gelman

  avformat/rtsp : Set port_off to zero for low min/max port range
  Fixes :
  
  $ ffmpeg -min_port 32000 -max_port 32001 -i rtsp ://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov -f null -
  
  [1]    303871 floating point exception (core dumped)
  Reviewed-by : Martin Storsjö <martin@martin.st>
  
  Signed-off-by : Andriy Gelman <andriy.gelman@gmail.com>
  

  • [DH] libavformat/rtsp.c

• ffmpeg is cutting video length incorrectly

  1er mars 2018, par jameshwart lopez

  I use ffmpeg to check the length of the video and to cut video.

  I have a video with the lenght of 19.458333 seconds that’s why i want to cut it to only have 19 seconds because i don’t want the floating point.

  I check the video length using below command

  ffprobe -i "video.avi" -show_entries format=duration -v quiet -of csv="p=0"

  And I use below command to cut video the video

  ffmpeg -i  "video.avi" -ss 00:00:00 -t 00:00:19.000 -c copy out.mp4

  or

  ffmpeg -i  "video.avi" -ss 00:00:00 -t 19 -c copy output.avi

  The problem i have is when i cut the video with the above command and check the length the output file’s length is 19.018 seconds. Can someone help me with this problem ?

• Checkasm : assembly testing and benchmarking tool

  11 juillet 2015, par Henrik Gramner

  Checkasm : assembly testing and benchmarking tool
  It provides the following features :
  
   * verify correctness by comparing output to the C version.
  
   * detect failure to save and restore clobbered callee-saved registers.
  
   * detect 32-bit parameters being used as if they were 64-bit in x86-64
  
     (the upper halves are not guaranteed to be zero - but in practice
  
     they very often are, which makes those bugs hard to spot otherwise).
  
   * easy benchmarking.
  Compile by running ’make checkasm’.
  
  Execute by running ’tests/checkasm/checkasm’.
  Optional arguments are ’—bench’ to run benchmarks for all functions,
  
  ’—bench=<pattern>’ to run benchmarks for all functions that starts with
  
  <pattern>, and ’<integer>’ to seed the PRNG for reproducible results.
  Contains unit tests for most h264pred functions to get started, more tests
  
  can be added afterwards using those as a reference.
  Loosely based on code from x264. Currently only supports x86 and x86-64,
  
  but additional architectures shouldn’t be too much of an obstacle to add.
  Note that functions with floating point parameters or floating point
  
  return values are not supported. Some compiler-specific features or
  
  preprocessor hacks would likely be required to add support for that.
  Signed-off-by : Janne Grunau <janne-libav@jannau.net>
  

  • [DBH] .gitignore
  • [DBH] tests/Makefile
  • [DBH] tests/checkasm/Makefile
  • [DBH] tests/checkasm/checkasm.c
  • [DBH] tests/checkasm/checkasm.h
  • [DBH] tests/checkasm/h264pred.c
  • [DBH] tests/checkasm/x86/Makefile
  • [DBH] tests/checkasm/x86/checkasm.asm