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• Ffmpeg Symfony5 PHP8 [duplicate]

  11 septembre 2021, par Kévin Ducrocq

  I'm a french student learning web development, and how to create websites on Symfony 5.

  


  I've got this project to create a kind of Youtube website using Ffmpeg to convert and treat videos.

  


  However, when I try to use the "composer require php-ffmpeg/php-ffmpeg" command, it doesn't work and I really don't know what to do.

  


  here's the error I've got :

  


  PS C :\Users\Dev\Documents\Dev\Symfony\Youride> composer require php-ffmpeg/php-ffmpeg
Using version ^0.18.0 for php-ffmpeg/php-ffmpeg
./composer.json has been updated
Running composer update php-ffmpeg/php-ffmpeg
Loading composer repositories with package information
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  


  Problem 1
- Root composer.json requires php-ffmpeg/php-ffmpeg ^0.18.0 -> satisfiable by php-ffmpeg/php-ffmpeg[v0.18.0].
- php-ffmpeg/php-ffmpeg v0.18.0 requires doctrine/cache ^1.0 -> found doctrine/cache[v1.0, ..., 1.12.1] but it conflicts with your root composer.json require (^2.1).

  


  Use the option —with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.

  


  Installation failed, reverting ./composer.json and ./composer.lock to their original content.
PS C :\Users\Dev\Documents\Dev\Symfony\Youride>

  


  thank you for your help, I'm a beginner... :)

  


• C++ : FFMPEG and SDL resources

  22 janvier 2013, par advs89

  I'm looking for resources (preferably books, but websites are fine too) for using FFmpeg and/or SDL with C++.

  Stuff I'd like to be able to do (eventually) :

  • Decode and play videos in realtime to a QT widget (the QT part isn't a problem)
  • Overlay text and images on the video (in realtime)
  • Loop video
  • Cross-fade from one video to another (in realtime)
  • Some kind of DVD functionality
  • LIVE sources ? (i.e. webcam, stream, etc.)

  So far I've looked at (and consider helpful) the following resources :

  • FFmpeg and SDL Tutorial by Dranger (extremely helpful)
  • Stack Overflow : ffmpeg C API documentation/tutorial (not a duplicate, btw)

  • Sample code bundled with FFMPEG libraries

    (I'll try and update this list with anything helpful below)

  Thanks for any help...

  Also : Operating System is Windows (but maybe one day cross-platform)
  Also 2 : Resources using alternatives are welcome too... i.e. DirectShow, VFW, etc.

• avcodec/smacker : Replace implicit checks for overread by explicit ones

  25 juillet 2020, par Andreas Rheinhardt

  avcodec/smacker : Replace implicit checks for overread by explicit ones
  Using explicit checks has the advantage that one can combine several
  
  checks into one and does not have to check every time. E.g. reading a
  
  16bit PCM sample involves two calls to get_vlc2(), each of which may
  
  read up to three times up to SMKTREE_BITS (= 9) bits. But given that the
  
  padding that the input packet is supposed to have is large enough, it is
  
  no problem to only check once for each sample.
  This turned out to be beneficial for performance : For GCC 9, the time for
  
  one call of smka_decode_frame() for the sample from ticket #2425 went down
  
  from 2055905 to 1804751 decicycles ; for Clang 9 it went down from 1510538
  
  to 1479680 decicycles.
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavcodec/smacker.c