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• calling pre-compiled executables

  20 juillet 2015, par Steven Mattu

  I am working on a project that makes use of the ffmpeg library within the framework of Qt on an Intel Windows 8.1 machine. My application uses a QProcess to call the ffmpeg.exe with a list of list of arguments that works perfectly. I was just wondering if it would be more efficient to use the ffmpeg source with the C++ code and call functions directly using using libav.h ?

  When i use the QProcess it creates a separate thread so the rest of my program is unaffected by the process. If i was to use the functions directly from libav.h i would need to create my own QThread and run the function in that.

  Any advice would be helpful.

  Steve

• Kivy Crashes when Loading Multiple Audio Files

  26 mars 2022, par Omid Ketabollahi

  I have a music folder and in it I have a script that loads all the files using SoundLoader and assigns them to a variable. I have 9 audio files that I load in the script but it seems like that kivy cannot handle loading many audio files ? When I run my main script I get this error and the program crashes :

  


  Assertion 'pa_atomic_load(&(c)->_ref) >= 1' failed at pulse/context.c:1056, function pa_context_disconnect(). Aborting.


  


  I don't think that this is an issue with the audio files ( I may be wrong ) because I tried loading other files instead of the original ones that I used and I still got this error.

  


  In case you are wondering, this is the code :

  


  import os.path
from typing import Final
from constants import MUSIC_DIRECTORY
from kivy.core.audio import SoundLoader

__all__ = (
    "A_DARK_TIME",
    "BLOOD_PUMPING",
    "BROKEN_VILLAGE",
    "DRUM_COMMERCIAL_B",
    "SUPER_SUSPENSE",
    "THE_HERO_WE_NEED",
    "TROUBLE_IS_BREWING",
    "VIKING_FEAST",
    "WARRIOR_GODS",
)


A_DARK_TIME: Final = SoundLoader.load(
    os.path.join(MUSIC_DIRECTORY, "A-Dark-Time-David-Fesliyan.mp3")
)
BLOOD_PUMPING: Final = SoundLoader.load(
    os.path.join(MUSIC_DIRECTORY, "Blood-Pumping-David-Fesliyan.mp3")
)
BROKEN_VILLAGE: Final = SoundLoader.load(
    os.path.join(MUSIC_DIRECTORY, "Broken-Village-David_Fesliyan.mp3")
)
DRUM_COMMERCIAL_B: Final = SoundLoader.load(
    os.path.join(MUSIC_DIRECTORY, "Drum-Commercial-B-David-Fesliyan.mp3")
)
SUPER_SUSPENSE: Final = SoundLoader.load(
    os.path.join(MUSIC_DIRECTORY, "Super-Suspense-David-Fesliyan.mp3")
)
THE_HERO_WE_NEED: Final = SoundLoader.load(
    os.path.join(MUSIC_DIRECTORY, "The-Hero-We-Need-Steve-Oxen.mp3")
)
TROUBLE_IS_BREWING: Final = SoundLoader.load(
    os.path.join(MUSIC_DIRECTORY, "Trouble-Is-Brewing-David-Fesliyan.mp3")
)
VIKING_FEAST: Final = SoundLoader.load(
    os.path.join(MUSIC_DIRECTORY, "Viking-Feast-David-Fesliyan.mp3")
)
WARRIOR_GODS: Final = SoundLoader.load(
    os.path.join(MUSIC_DIRECTORY, "Warrior-Gods-Steve-Oxen.mp3")
)


  


• using ffmpeg to automate splitting video into quarters and stacking

  11 février 2014, par user3297049

  I need to create a quick FFMPEG batch file that takes a very wide video file and splits it into quaters (dimension wise not time wise), then outputting a file where each quarter is under the previous.

  E.g.

  A B C D

  would become
  A
  B
  C
  D
  

  I know this should be possible with crop and pad commands, and through research I've found that someone divided into quarters and put the top left and bottom right next to each other horizontally using :

  "% dp0\ffmpeg.exe" -i %1 -filter_complex "[0:0]crop=iw/2:ih/2:0:0,pad=iw*2:ih:0:0[tl] ;[0:0]crop=iw/2:ih:iw/2:ih/2[br] ;[tl][br]overlay=W/2" -b:v 32000k -b:a 128k %1_2.avi

  Can anyone help as the command line is beyond me.
  Thanks
  Steve