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• multichannel (dolby digital, DTS, ecc.) delay difference on original master

  17 janvier 2017, par esposito

  I have different flac files with 6/8 channels (this is the audio of movie) and I need to mix with ffmpeg part of rear channels with front channels and sometimes viceversa.

  There is no problem do it the operation work with an automate software.

  But I’am sure there is a phase difference beetween front channels and rear channels and I like to add a delay to compensate this difference (when I listen it is clear there is a phase offset and this degrade the result).

  I don’t have an idea about how many milliseconds I need to add to compensate and what channel and if the difference is negative or positive.

  Someone can help me please to understand approximately what are the range of delay for each channel (a table is very useful) ?

  Thank you !!

• Anomalie #2232 (Rejeté) : Affichage de la mémoire par la page courante

  19 août 2011, par Johan Pustoch

  en haut à droite de l’espace privé, s’affiche l’utilisation de la mémoire par la page courante (extension dev). Personnellement, je viens de comprendre ce que c’est grâce à http://www.spip-contrib.net/Doc-SPIP3 J’ai même pensé à un moment que c’était la taille de mon site... Mais comme ça changeait à (...)

• ffmpeg grap a image from webcarmera issue from python invoking

  5 août 2021, par neil2021

  I meet an issue that cmd of ffmpeg is working from dos command line but not working from python code with error :
not working from python invoking

  


  cmd :
ffmpeg -f dshow -i video="Webcam C170" -frames 1 target.jpg
is working well from windows dos command line
working well from dos command line
but failed when using os.system(cmd) or os.popen(cmd) or subprocess.popen(cmd) not working from python invoking

  


  I do not know why the ffmpeg is not working while invoking by python code.

  


  The error is as following :

  


  Input #0, dshow, from 'video=Webcam C170':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> mjpeg (native))
Press [q] to stop, [?] for help
video=Webcam C170: I/O error
[swscaler @ 0000024a6b9a03c0] deprecated pixel format used, make sure you did set range correctly
Output #0, image2, to 'target.jpg' 


  


  I tried to use os.system(cmd) or subprocess.call(cmd) or os.Popen(cmd) or subprocess.call(cmd) with cmd = 'ffmpeg -f dshow -i video="Webcam C170" -frames 1 target.jpg' or cmd =  ['ffmpeg', '-f', 'dshow', '-i', 'video=Webcam C170', '-frames', '1', target] all get the error - video=Webcam C170 : I/O error

  


  even if I use os.system("get_image.bat") to invoke a dos batch script with content ffmpeg -f dshow -i video="Webcam C170" -frames 1 target.jpg it still failed with the same error video=Webcam C170: I/O error

  


  It can only succeed when I type this script in dos window with script as following : ffmpeg -f dshow -i video="Webcam C170" -frames 1 target.jpg

  


  Anyone who have experience for this, please kindly help me out.