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• Trying to install ffmpeg with brew and I keep getting errors related to "dav1d_bottle_manifest"

  13 décembre 2022, par Jonathan Doe

  I am trying to do some basic DSP in python and in order to play some of my audio files I need to install ffmpeg on my computer.

  


  I am running a 2019 macbook pro.

  


  When I run brew intsall ffmpeg -d

  


  I get this on my terminal output

  


  rm: /usr/local/Homebrew/.git/TMP_FETCH_FAILURES: is a directory
rm: /usr/local/Homebrew/.git/TMP_FETCH_FAILURES: is a directory
Running `brew update --auto-update`...


  


  This auto update just runs forever with no updates of any kind. I'm not sure if it is broken or stuck or what.

  


  I try to manually run :

  


   brew update -d


  


  and the update stalls forever on this section :

  


  + [[ -f /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/.git/FETCH_HEAD ]]
+ touch /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/.git/FETCH_HEAD
+ [[ -z '' ]]
+ [[ 200 == \3\0\4 ]]
+ [[ -n '' ]]
+ local tmp_failure_file=/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/.git/TMP_FETCH_FAILURES
+ rm -f /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/.git/TMP_FETCH_FAILURES
+ [[ -n '' ]]
+ git fetch --tags --force -q origin refs/heads/master:refs/remotes/origin/master


  


  I am having so many problems with brew any help would be appreciated.

  


• FFmpeg cannot extract correct first frame - always extract the second frame [closed]

  21 octobre 2024, par Cai Yu

  I am on macos Ventura 13.2.1, on Macbook Pro M1Max.

  


  The video is number counting animation video. From 2 to 125. The number on first frame is 2. The number on last frame is 125. The number plus one on each frame. You can download the video here.

  


  NOTE that :
First, you hit space bar to play it in Finder, you can see the first frame of the video is number 2.

  


  Second, in professional Video editing software - davinci resolve, on the timeline, you can see the first frame is number 2.

  


  Now I try to use FFmpeg to extract the first frame of the video.
First Try :

  


  ffmpeg -i /Users/chris/Downloads/2to125.mov -vframes 1 /Users/chris/Downloads/1.png


  


  The output png image is number 3. So it's actually the second frame.

  


  Second try :

  


  ffmpeg -i /Users/chris/Downloads/2to125.mov -frames:v 1 /Users/chris/Downloads/1.png


  


  The output png image is still the second frame - the number 3.

  


  Third try :

  


  ffmpeg -i /Users/chris/Downloads/2to125.mov -vf "select=eq(n\,0)" -q:v 3 /Users/chris/Downloads/1.png


  


  The output image is sitll the wrong second frame.

  


  NOTE that :

  


  first : all these three method are from internet. And a lot of people voted correct answer for this question.

  


  second : all their output on my system is the incorrect second frame, not the first frame.

  


  I cannot find what's wrong. Hope friend here help me.

  


• How to use NSProcessInfo's operatingSystemVersion property in place of gestaltSystemVersionMinor and gestaltSystemVersionBugFix

  28 octobre 2016, par Michael Whiteacre

  Newbie here, but longtime frequenter of this essential resource.

  Using :
  MacBook Pro (Retina, 13-inch, Early 2015).
  Processor : 3.1 GHz Intel Core i7
  Memory : 16 GB 1867 MHz DDR3
  Running Yosemite 10.10.5

  I’m attempting to compile my own Perian- and FFmpeg-based FFusion.component (for Quicktime), for 10.11 using Xcode 7.2.1, and in this relatively simple project, as in others, am trying to move away from Gestalt. The original FFusion-RJVB.xcodeproj I’m employing is Xcode-3.2 compatible.

  I have yet to find a clear, definitive solution to what must appear a painfully simple problem to you all. Here is the Gestalt version :
  `

  #if TARGET_OS_MAC
  
  static int GetSystemMinorVersion()
  
  {
  
      static SInt32 minorVersion = -1;
  
      if (minorVersion == -1)
  
          Gestalt(gestaltSystemVersionMinor, &minorVersion);
  
  
  
      return minorVersion;
  
  }
  
  
  
  static int GetSystemMicroVersion()
  
  {
  
      static SInt32 microVersion = -1;
  
      if (microVersion == -1)
  
          Gestalt(gestaltSystemVersionBugFix, &microVersion);
  
  
  
      return microVersion;
  
  }
  
  #endif

  `
  I’ve tried what seems like endless variations of NSProcessInfo i.e.

  ([[NSProcessInfo processInfo] respondsToSelector:@selector(operatingSystemVersion)])

  but I’m afraid I’m not formatting it correctly to achieve my ends. It just hasn’t ’clicked’ in my head yet, so Im hoping someone can give me a push when I see the difference between the gestalt version, my stumbling attempts, and the correct way.

  Many thanks.