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• YUV to RGB by Shader on iPhone

  27 octobre 2012, par user1333656

  Currently I am developing a video player using FFMPEG.
  I'm trying to convert YUV420P to RGB by Shader to reduce performance hit and I could see it works fine. The problem is caused when I try to change image size.

  Case 1. YUV to RGB is perfect. but the image is not exactly fit to Texture Bounds.
  For example, if i play 640x360 video, right (640-512) part is cropped and bottom (512-360) is filled with green colored rectangle.

  FRAME_X=512; //This is texture size
  
  FRAME_Y=512;
  
  
  
      avpicture_fill((AVPicture *) f, [currentVideoBuffer.data mutableBytes],
  
                 enc->pix_fmt,
  
                 FRAME_X, FRAME_Y);
  
  
  
      av_picture_copy((AVPicture *) f, (AVPicture *) avFrame,
  
                  enc->pix_fmt,
  
                  enc->width, enc->height);

  ....

  int yuvWidth= FRAME_X ;
  
  int  yuvHeight= FRAME_Y;
  
  glBindTexture ( GL_TEXTURE_2D, textureIdY );
  
  glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 
  
  yuvWidth, yuvHeight, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, y_channel);
  
  
  
  
  
  glBindTexture ( GL_TEXTURE_2D, textureIdU );
  
  glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE,
  
  yuvWidth/2, yuvHeight/2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, u_channel);
  
  
  
  glBindTexture ( GL_TEXTURE_2D, textureIdV );
  
  glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 
  
  yuvWidth/2, yuvHeight/2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, v_channel);

  Case 2. If i set actual image size to texture size, then image is exactly fit to texture but the color of image is a little bit strange. It has too much green color.

  Does anybody give me some clues for this ??
  Thanks in advance.

• Ffmpeg - Exclamation Point Stopping Watermark

  25 août 2018, par user5947524

  I am using the code below to automatically watermark videos in a folder :

  for %%a in ("C:\Users\Work\Desktop\Redo\*.mp4") do (
  
     for /F "delims=" %%I in ('ffprobe -v quiet -show_entries stream^=width -of csv^=p^=0:s^=x %%a') do set "codec=%%I"
  
     ffmpeg -i logo.png -y -v quiet -vf scale=!codec!*0.25:-1 scaled.png
  
     ffmpeg -i "%%a" -vf "movie=scaled.png [watermark]; [in][watermark] overlay=10:main_h-overlay_h [out]" "C:\Users\Work\Desktop\Redo Done\%%~na.mp4"
  
  )

  Some of the videos fail to watermark and give the similar error below :

  C:\Users\Work\Desktop\Redo\Arcade_h-overlay_h [out]: No such file or directory

  I found out all videos with exclamation points (!) in the name do this.

  How can I get these videos to watermark with an exclamation point in the title ?

• OSError : [WinError 126] When Tried to Install WhisperAI [closed]

  11 mars 2024, par Kagamine09

  I've been trying to use WhisperAI on my PC and after following all the steps from here, I got this error :

  


  C:\Users\acer>whisper Traceback (most recent call last):   File "<frozen runpy="runpy">", line 198, in _run_module_as_main   File "<frozen runpy="runpy">", line 88, in _run_code   File "C:\Program Files\Python312\Scripts\whisper.exe\__main__.py", line 4, in <module>  File "C:\Users\acer\AppData\Roaming\Python\Python312\site-packages\whisper\__init__.py", line 8, in <module>&#xA;    import torch   File "C:\Users\acer\AppData\Roaming\Python\Python312\site-packages\torch\__init__.py", line 141, in <module>&#xA;    raise err OSError: [WinError 126] The specified module could not be found. Error loading "C:\Users\acer\AppData\Roaming\Python\Python312\site-packages\torch\lib\cudnn_cnn_infer64_8.dll" or one of its dependencies.&#xA;</module></module></module></frozen></frozen>

  


  I've tried to reinstall everything, moved files to "Path" folder but still no luck.