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• Create a rolling X second webcam buffer in Linux, press button saves to file

  13 août 2016, par Grant Gibson

  I’m working on a webcam installation with an ’instant replay’ feature. The concept is basically this :

  1. Webcam captures live, 24/7
  2. When user presses a key, the last (previous) 30 seconds of video saves to a file
  3. I’ll then compress that video using something like FFMPEG and upload to a remote server

  I’m fine with step 3 and beyond, but I haven’t been able to find a solution that does the equivalent of a FIFO buffer for video streams [i.e. pretty much what the ’rewind live tv’ buffer on TiVo does].

  Does anyone know of a way to keep a rolling webcam video/audio buffer that can be exported to a file ?

  Design considerations :

  • I’m planning to use a standard webcam, but open to other suggestions
  • Recording would ideally be 1080p, 30fps
  • Recording must include sound
  • Linux hardware and OS can be specified in the answer, there are no existing pre-requisites. Raspberry Pi would be nice if that’s possible, but equally fine with a small Intel machine (e.g. NUC).
  • There’s no requirement to save the 24/7 stream, but it’s ok if that’s a by-product. So, storage permitting it can be saving to a file continuously for say 12 hours and just ’cat’ the last 30 secs to a separate file, if that’s an option ? But better would be the 30 sec rolling FIFO buffer that could potentially do the whole job in RAM.
  • The ’save instant replay’ button will eventually be a physical pushbutton rather than a keyboard key. However, I’ve got that side of things covered (if the solution is RPi I’d use the GPIO pins, if it’s an Intel box I’d probably use an Arduino in HID mode to simulate a keyboard press).

• configure : Include the armcc build number in the compiler identification

  28 juillet 2014, par Martin Storsjö

  configure : Include the armcc build number in the compiler identification
  This tries to find the most expressive part of the output of
  
  armcc —vsn to include, giving a compiler identification of
  
  "ARM Compiler 5.04 update 2 (build 82)" instead of just
  
  "ARM Compiler 5.04" for armcc 5.0.
  4.x versions of armcc output the following, for "armcc —vsn" :
  
  ARM C/C++ Compiler, RVCT4.0 [Build 925]
  
  For evaluation purposes only
  
  Software supplied by : ARM Limited
  ARM C/C++ Compiler, 4.1 [Build 894]
  
  For evaluation purposes only
  
  Software supplied by : ARM Limited
  5.0 versions output this :
  
  Product : ARM Compiler 5.04
  
  Component : ARM Compiler 5.04 update 2 (build 82)
  
  Tool : armcc [5040081]
  
  For evaluation purposes only
  
  Software supplied by : ARM Limited
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] configure

• Missing Library Error in Mac Catalyst when distributed through Testflight

  25 avril 2023, par STerrier

  The iOS version of the app is functioning correctly on TestFlight, and there are no issues when building the Mac Catalyst version of the app from Xcode. However, when distributing the app to TestFlight for Mac Catalyst, the FFmpegkit library fails to load, resulting in a crash. The crash report indicates that the library is missing and cannot be located in the designated file path.

  


  Specifically, the crash report states that the library could not be loaded from "@rpath/ffmpegkit.framework/ffmpegkit". Despite extensive efforts, I have been unable to resolve this issue.

  


  This is error message in the crash report.

  


  Termination Reason : Namespace DYLD, Code 1 Library missing&#xA;Library not loaded : @rpath/ffmpegkit.framework/ffmpegkit&#xA;Referenced from : <9162F8B0-7112-310B-8EDA-59766087927F> /Applications/MyApp.app/Contents/MacOS/MyApp&#xA;Reason : tried : '/System/Library/Frameworks/ffmpegkit.framework/ffmpegkit' (no such file, not in dyld cache), (security policy does not allow @ path expansion)&#xA;(terminated at launch ; ignore backtrace)

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  Are there any alternative solutions to resolve this problem ?

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  UPDATE

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  • I tried Eugene Dudnyk Solutions but I still received the same error

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  • I checked the package content found in Testflight and the paths are correctly matching the following /System/Library/Frameworks/ffmpegkit.framework/ffmpegkit

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  • I ran the app scheme as release within Xcode and it build and ran fine with no issues

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  • I manually loaded the signing certificates for mac catalyst and still getting the error

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  • Deleted all derived data

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  • Deleted and reinstalled Xcode and also tried previous Xcode versions.

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  • Deleted the project completely

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  I tried most of the solutions mentioned in this post with no avail.&#xA;iOS app with framework crashed on device, dyld : Library not loaded, Xcode 6 Beta

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