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• BisonCam NB Pro not working correctly in VMware Xubuntu 16.04

  29 août 2016, par bot1131357

  I am trying to access my webcam (BisonCam, NB Pro) on a VMWare Xubuntu 16.04 virtual machine using ffmpeg, but it’s not working. Here’s what I did :

  $ ./ffmpeg -f v4l2 -i /dev/video0 ~/Dev/out.avi
  
  ffmpeg version N-81392-ga453bbb Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.2) 20160609
  
    configuration: --pkg-config-flags=--static --enable-shared --enable-pic --enable-libvpx --prefix=/home/ytan/Dev/build-x64
  
    libavutil      55. 29.100 / 55. 29.100
  
    libavcodec     57. 54.100 / 57. 54.100
  
    libavformat    57. 47.101 / 57. 47.101
  
    libavdevice    57.  0.102 / 57.  0.102
  
    libavfilter     6. 52.100 /  6. 52.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100

  The webcam LED turned on, but the console remained like that for as long as I let it. When I press ’Ctrl + c’, the following message is returned :

  Input #0, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, bitrate: 88473 kb/s
  
      Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720, 88473 kb/s, 6 fps, 6 tbr, 1000k tbn, 1000k tbc
  
  File '/home/ytan/Dev/out.avi' already exists. Overwrite ? [y/N] y
  
  [avi @ 0x1f4a680] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
  Output #0, avi, to '/home/ytan/Dev/out.avi':
  
    Metadata:
  
      ISFT            : Lavf57.47.101
  
      Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1280x720, q=2-31, 200 kb/s, 6 fps, 6 tbn, 6 tbc
  
      Metadata:
  
        encoder         : Lavc57.54.100 mpeg4
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
  
  Could not write header for output file #0 (incorrect codec parameters ?): Immediate exit requested
  
  Exiting normally, received signal 2.

  At this point I figured that somehow ffmpeg isn’t able to read the frames from the webcam. Just to double-check, I tried running cheese to see if the issue is not exclusive to ffmpeg, and I was right. Here is a screenshot.

  Can someone help me with this ?

• brew install ffmpeg installs python 3.9

  13 novembre 2020, par mrgloom

  For some reason brew install ffmpeg downloads python 3.9 as dependence

  


  ==> Installing dependencies for ffmpeg: gnutls, python@3.9, glib, cairo, gobject-introspection, harfbuzz, libass and libvpx


  


  As I can see here https://formulae.brew.sh/formula/ffmpeg there is no dependence on python 3.9

  


  How can I install ffmpeg for my current python Python 3.7.7 ?

  


  Update :

  


  Maybe something is broken in my python installation ?

  


  brew info python&#xA;&#xA;python@3.9: stable 3.9.0 (bottled)&#xA;Interpreted, interactive, object-oriented programming language&#xA;https://www.python.org/&#xA;/usr/local/Cellar/python/3.7.7 (4,165 files, 64.0MB) *&#xA;  Poured from bottle on 2020-04-03 at 20:11:58&#xA;From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/python@3.9.rb&#xA;License: Python-2.0&#xA;==> Dependencies&#xA;Build: pkg-config ✔&#xA;Required: gdbm ✔, openssl@1.1 ✔, readline ✔, sqlite ✔, xz ✔&#xA;==> Caveats&#xA;Python has been installed as&#xA;  /usr/local/bin/python3&#xA;&#xA;Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to&#xA;`python3`, `python3-config`, `pip3` etc., respectively, have been installed into&#xA;  /usr/local/opt/python@3.9/libexec/bin&#xA;&#xA;You can install Python packages with&#xA;  pip3 install <package>&#xA;They will install into the site-package directory&#xA;  /usr/local/lib/python3.9/site-packages&#xA;&#xA;See: https://docs.brew.sh/Homebrew-and-Python&#xA;==> Analytics&#xA;install: 588,344 (30 days), 666,372 (90 days), 666,373 (365 days)&#xA;install-on-request: 104,126 (30 days), 105,703 (90 days), 105,705 (365 days)&#xA;build-error: 0 (30 days)&#xA;</package>

  


  brew info shows python@3.9 but actually it's 3.7.7 :

  


  /usr/local/bin/python3 -V
Python 3.7.7


  


• R "only" substitute of the av package to split and convert an mp4 into multiple mp3 [closed]

  9 février 2024, par Bakaburg

  I am developing an R package that requires splitting an mp4 file into multiple segments and converting these segments into mp3 format. Currently, I use the av package for this task. However, av depends on the external ffmpeg tool, necessitating separate installation. This dependency complicates the setup for non-expert users of my package.

  


  I am seeking an alternative approach that either uses only R or incorporates a low-level solution directly within the package, eliminating the need for external tool installations. The goal is to streamline the user experience by minimizing setup complexity.

  


  Does anyone know of such a solution or approach that can substitute the functionality provided by av without external dependencies ?