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• /usr/include/time.h:243:29 : error : expected identifier or ‘(’ before ‘__const’ [duplicate]

  27 novembre 2019, par user12408787

  This question already has an answer here :

  • FFmpeg : building example C codes
    
    1 answer
    

  When I used gcc to compile program，I meet this error messages，and i have searched answers online，but can not find any results，so I want to ask how to fix this？

• what FFMPEG performance settings to use for processing videos for the web

  19 juin 2015, par eAbi

  I have a few questions regarding usage of ffmpeg for processing videos for the web. I’m a beginner so please bear with me (although I read some docs on the internet)

  Performance

  • First of all, given the fact that FFMPEG utilizes all cores at 100%, what is the actual parallelism efficiency ?

  Let’s assume the following scenario. I have a video (fullHD, doesn’t matter what encoders / compression format was used to obtain the video) and I want to resize (downscale) to various sizes (e.g. 240px, 480px and 720px height) using mp4 format (thus using libx264 with aac codecs).

  Using ffmpeg, I see that all of my laptop’s cores (8) are used at 100% and I was wondering what scenarios can improve the overall performance of the whole processing task. So this leads us to basically 2 scenarios : Assuming the video mentioned above as input, for obtaining the 3 output videos (@ 240px, 480px and 720px height sizes), we :

  1. Process input video and obtain 1 output video at a time, and let all the cores work at the same time at 100% ;
  2. Process the video to obtain all output videos in parallel, by bounding each output video to a single processor core which’ll work at 100% ;

  So the question is actually reduced to the parallelism efficiency of the ffmpeg program.

  This means that letting ffmpeg process the task procVideo - which takes 1 input video to produce 1 single output video (transcoding/downscaling and so on) - on N processor cores doesn’t mean it finish the task N times faster than letting it run the same task bound to a single core. So if the efficiency is smaller than 100%, it’s better to have N procVideo tasks in parallel, each bound to a single core, rather than doing the task sequentially for each output video.

  ---

  Codecs

  Other than the above performance problem, the usage of codecs bugs me. I am trying to obtain mp4 videos because of the wide implementation of the format in html5 browsers.

  So having a video as input in any format, I want to convert it to mp4. So I’m using libx264 codec with aac.

  • Use libx264, x264 or h264 for video encoding/decoding ?
  • Use libfdk_aac, libaacplus or aac for audio encoding/decoding to aac ?

  Also, I would like to know what are the licesing fees for each of the above codec, as the online resources on these are quite limited / hard to understand.

  If anyone could shed some light on those questions, I would really be grateful ! Thanks for your time !

• Looking for a Sales Development Representative (Jobs at Piwik)

  20 mai 2015, par Piwik Core Team — Jobs

  This blog post is a job offer at Piwik PRO for a Sales Development Representative. Please share this job ad if you know anyone who may be interested.

  Job description

  As a sales development rep your job will be to work with our sales team to identify and nurture sales opportunities. You will be one of the initial building blocks of our US operation, especially as we begin to scale it, so there will be plenty of opportunities for advancement within the company.

  Responsibilities

  • Generate new sales opportunities
  • Help to develop and improve sales strategies
  • Set up discussions with senior executives and evaluate their business needs
  • Manage and nurture a pipeline of prospects until a given stage
  • Use marketing & sales CRM tools

  Requirements

  • Desire to learn and succeed in sales
  • 1+ years of related experience
  • Advanced research skills
  • Ability to write professional emails
  • Native English proficiency with excellent verbal communication skills
  • Passion for technology

  Compensation

  Salary (full-time) + performance-based incentives

  Location

  Remote

  About Piwik PRO

  At Piwik and Piwik PRO we develop the leading open source web analytics platform, used by over 1.1M websites worldwide and is currently ranked the 7th most used web analytics tool in the world. Our vision is to build the best open alternative to Google Universal Analytics.

  The Piwik platform collects, stores and processes a lot of information : hundreds of millions of data points each month. We create intuitive, simple and beautiful reports that delight our users.

  Apply online

  To apply for this position, please Apply online here. We look forward to receiving your applications !