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• FFMpeg mp4 to mp4 codec switching failing

  31 juillet 2015, par Cory Lineberger

  Ok so sorry from the beginning if this is a newb question or if it is in the wrong place, this IS my first question on here.

  So I record things that save files in an mp4 container, I am unsure of the exact codecs it uses, but I know the video codec is not libx264, because if it was Premier would accept it. The audio on Premier works fine. But the video doesn’t. It says that it is an only audio file, but when I play it in, say, Windows Media Player, both the audio and video work fine. The line of copy I am trying to use (in a .bat, if that helps) is :

  @ECHO OFF
  
  for %%a in (*.mp4) do ffmpeg -i "%%a" -c:v libx264 -preset ultrafast -qp 10 -c:a copy -y "%%~na".mp4

  I have very little experience with this...... stuff. I should go ahead and mention, I am running Windows 10. In Windows 7 I used a different program that recorded AVI files that used an invalid video codec for Premier. But this .bat code worked to convert those.

  @ECHO OFF
  
  for %%a in (*.avi) do ffmpeg -i "%%a" -c:v libx264 -preset ultrafast -qp 10 -f mp4 -y "%%~na".mp4

  So I figured just changing some stuff would work, but I guess not.

  EDIT : Speaking of being my first question I forgot to put the problem !
  The problem is that it DOES convert it, but it converts 5 seconds of a 40+ min video and then exits out.

• Evolution #3962 (Nouveau) : Générer des JPEG progressifs

  18 juin 2017, par Michel Bystranowski

  Le format JPEG propose un encodage « progressif » qui permet aux navigateurs d’afficher une version peu détaillée de l’image avant la réception complète, ce qui améliore l’expérience utilisateur sur des mauvaises connections. En cherchant un peu je ne trouve pas de contre-indications. Les vieux IE ne supportent pas ce format, mais affichent quand même les images après réception complète, donc pas de changement par rapport aux JPEG « classiques ».

  La librairie GD permet de générer ce genre de JPEG très facilement, il suffit d’appeler la fonction imageinterlace (https://secure.php.net/manual/en/function.imageinterlace.php) avant de générer le JPEG.

  Du coup il me semble qu’on pourrait utiliser ça dans SPIP, en ajoutant simplement un petit imageinterlace($img, 1); dans la fonction _image_imagejpg qui se trouve dans ecrire/inc/filtres_images_mini.php.

• Using Intel QSV in WSL2

  26 janvier 2023, par heebin

  I want to use Intel QSV in WSL2.

  


  Based on the experience of using QSV on a native Ubuntu PC, I installed the same library, but it doesn't work.

  


  ex) ffmpeg, libva, vainfo, intel Media SDK, gmmlib, media-driver ...

  


  My CPU supports QSV, but I can't initialize it.

  


  In vainfo it works like this :

  


  $ ls /dev/dri
card0 renderD128

$ sudo vainfo
Trying display: wayland
error: XDG_RUNTIME_DIR not set in the environment.
Trying display: x11
libva info: VA-API version 1.16.0
libva info: User environment variable requested driver 'iHD'
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so
libva info: Found init function __vaDriverInit_1_14
DRM_IOCTL_I915_GEM_APERTURE failed: Invalid argument
Assuming 131072kB available aperture size.
May lead to reduced performance or incorrect rendering.
get chip id failed: -1 [22]
param: 4, val: 0
libva error: /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so init failed
libva info: va_openDriver() returns 18
vaInitialize failed with error code 18 (invalid parameter),exit


  


  I want WSL to be initialized properly so I can use it in C.