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• PHP large video upload converting to mp3 by ffmpeg

  27 mai 2017, par SuperBerry

  I am working on a project on Linux VPS (Apache + PHP5, 4G RAM / 2 CPU Cores) which allows users to upload videos (200M max) and convert to MP3 audio files by FFMPEG. I have few questions about the concurrency and the processing because I am a newbie on PHP :

  1. If there are 10 visitors uploading (1 visitor uploads one 200M MP4 file), will it cost 2,000M memory of the server ? Will the chunk upload method could solve this memeory issue while more visitors uploading videos at the same time ?

  2. I am going to use Redis to manage the ffmpeg processing queue, and set the crontab. Should I use the shell_exec() to call the ffmpeg to process the conversion at background, then convert the uploaded videos one by one ?

  The uploading and conversion is the most cost for the server I think... Maybe my idea is extremely crazy...I am new to this type of service.. I didn’t make online projects before, just desktop apps...

  Thanks a lot for your help..

• Unable to overwrite ffmpeg metadata

  11 décembre 2019, par underscore

  I am having some issues overwriting the metadata on video files using FFmpeg that already has metadata added to it previously(previous metadata also added by FFmpeg).

  So I am using ffmpeg -i path/to/video file -i /path/to/metadata -map_metadata 1 -codec copy path/to/output file to merge the metadata file with the video file but if the video file has already been through this command once the new metadata won’t stick, only the old ones remain. Is there a way of forcing the metadata to be overwritten by the new metadata file ?

  Most of what I have tried so far have only been making a metadata text file from scratch to see if there were some issues with the metadata I was extracting from the video file using ffmpeg -i path/to/video file -f ffmetadata path/to/metadata.
  So far I haven’t been able to find a lot about this online other than variations on this command, however, I think that is mostly due to the fact that I am not entirely sure what keywords I should search for.

  Thanks for the read

• Trolls in trouble

  6 juin 2013, par Mans — Law and liberty

  Life as a patent troll is hopefully set to get more difficult. In a memo describing patent trolls as a “drain on the American economy,” the White House this week outlined a number of steps it is taking to stem this evil tide. Chiming in, the Chief Judge of the Court of Appeals for the Federal Circuit (where patent cases are heard) in a New York Times op-ed laments the toll patent trolling is taking on the industry, and urges judges to use powers already at their disposal to make the practice less attractive. However, while certainly a step in the right direction, these measures all fail to address the more fundamental properties of the patent system allowing trolls to exist in the first place.

  System and method for patent trolling

  Most patent trolling operations comprise the same basic elements :

  1. One or more patents with broad claims.
  2. The patents of (1) acquired by an otherwise non-practising entity (troll).
  3. The entity of (2) filing numerous lawsuits alleging infringement of the patents of (1).
  4. The lawsuits of (3) targeting end users or retailers.
  5. The lawsuits of (3) listing as plaintiffs difficult to trace shell companies.

  The recent legislative actions all take aim at the latter entries in this list. In so doing, they will no doubt cripple the trolls, but the trolls will remain alive, ready to resume their wicked ways once a new loophole is found in the system.

  To kill a patent troll

  As Judge Rader and his co-authors point out in the New York Times, “the problem stems largely from the fact that, [...] trolls have an important strategic advantage over their adversaries : they don’t make anything.” This is the heart of the troll, and this is where the blow should be struck. Our weapon shall be the mightiest judicial sword of all, the Constitution.

  The United States Constitution contains (in Article I, Section 8) the foundation for the patent system (emphasis mine) :

  The Congress shall have Power [...] To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries.

  Patent trolls are typically not inventors. They are merely hoarders of other people’s discarded inventions, and that allowing others to reap the benefits of an inventor’s work would somehow promote progress should be a tough argument. Indeed, it is the dissociation between investment and reward which has allowed the patent trolls to rise and prosper.

  In light of the above, the solution to the troll menace is actually strikingly simple : make patents non-transferable.

  Having the inventor retain the rights to his or her inventions (works for hire still being recognised), would render the establishment of non-practising entities, which most trolls are, virtually impossible. The original purpose of patents, to protect the investment of inventors, would remain unaffected, if not strengthened, by such a change.

  Links

  • Taking on Patent Trolls to Protect American Innovation
  • Fact Sheet : White House Task Force on High-Tech Patent Issues
  • Make Patent Trolls Pay in Court
  • Constitution of the United States