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• Error trying to load ffmpeg library in dart

  24 juillet 2021, par Vinícius Pereira

  I'm a new programmer in de Dart world and I'm trying some stuff to learn more.
I'm trying to create a application that outputs audio from a file. I checked pub and I haven't found anything that suits my needs. So I found about dart:ffi and about ffmpeg capabilities.

  


  For the past few days I'm trying to load the ffmpeg libraries (avcodec, avformat, etc.) into my code but I haven't succeded.

  


  This is my code.

  


  var libraryPath = path.join(Directory.current.path, 'bin', 'avcodec.dll');
final dylib = ffi.DynamicLibrary.open(libraryPath);


  


  This is the error I got :

  


  Exception has occurred.
ArgumentError (Invalid argument(s): Failed to load dynamic library 'C:\Users\[MYUSER]\Documents\Code\Dart\ffmpeg\bin\avcodec.dll': 126)


  


  What I've tried so far :

  


  

  • Checked the path, it's right ;

  


  • Tried to import another library (sqlite3) with success ;

  


  • Tried to compile the DLLs myself and also tried prebuilt ones (from the links on ffmpeg site)

  


  


  My dart version Dart SDK version: 2.13.4 (stable) on "windows_x64"

  


  Whats the procedure to properly use the ffmpeg library with dart ?

  


• Tele-Arena Lives On

  25 février 2011, par Multimedia Mike — Game Hacking

  Readers know I have a peculiar interest in taking apart video games and that I would rather study a game’s inner workings than actually play it. I take an interest on others’ efforts in this same area. It’s still in my backlog to take a closer look at Clone2727’s body of work. But I wanted to highlight my friend’s work on re-implementing a game called Tele-Arena.

  
  
  

  Back In The Day
  As some of you are likely aware, there was a dark age of online communication that predated the era of widespread internet access. This was known as "The BBS Age". People dialed into these BBSes using modems that operated at abysmal transfer speeds and would communicate with other users, upload and download files, and play an occasional game.

  BBS software evolved and perhaps the ultimate (and final) evolution was Galacticomm’s MajorBBS (MBBS). There were assorted games that plugged into the MBBS, all rendered in glorious color ANSI graphics. One of the most famous of these games was Tele-Arena (TA). TA was a multiplayer fantasy-themed text adventure game. Perhaps you could think of it as World of Warcraft, only rendered as interactive fiction instead of a rich 3D landscape. (Disclaimer : I might not be qualified to make that comparison since I have never experienced WoW firsthand, though I did play TA on and off about 17 years ago).

  TA was often compared to multi-user dungeons — or MUDs — that were played by telneting into internet servers hosting games. Such comparisons were usually unfavorable as people who had experience with both TA and MUDs were sniffy elitists with internet access who thought they were sooooo much better than those filthy, BBS-dialing serfs.

  Sorry, didn’t mean to open old wounds.

  Modern Retelling of A Classic Tale
  Anyway, my friend Ron Kinney is perhaps the world’s biggest fan of TA. So much so that he has re-implemented the engine in Java under the project name Ether. He’s in a similar situation as the ScummVM project in that, while the independent, open source engine is fair game for redistribution, it would be questionable to redistribute the original data files. That’s why he created an AreaBuilder application that generates independent game data files.

  Ironically, you can also telnet into a server on which Ron hosts an instance of Tele-Arena (ironic in the sense that the internet/BBS conflict gets a little blurry).

  I hope that one day Ron will regale us with the strangest tales from the classic TA days. My personal favorite was "Wrath of a Sysop."

• ffmpeg with m3u8 : video and audio not synchronized

  3 avril 2017, par lemel

  I noticed while using ffmpeg to download m3u8 streaming playlist, I get sometimes faster video.
  If the content of the url master.m3u8 is the following :

  #EXTM3U
  
  #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=620941,RESOLUTION=640x352,CODECS="avc1.4d401f,mp4a.40.2"
  
  https://hello/world.m3u8

  If I’m not mistaken, ffmpeg should be able to decode the EXT-X-STREAM-INF information and assign the default value while downloading.
  But when I run the following command :

  ffmpeg -i "https://hello/darkness/my/old/friend/master.m3u8" -c copy "Some Video File.ts"

  I get a video that is faster than the Audio.
  If I run this command without the -c copy :

  ffmpeg -i "https://hello/darkness/my/old/friend/master.m3u8" "Some Video File.ts"

  I get a video and audio synchronized. But the video quality is worse.

  What’s the problem ?