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• aarch64 : vp9itxfm : Make the larger core transforms standalone functions

  23 novembre 2016, par Martin Storsjö

  aarch64 : vp9itxfm : Make the larger core transforms standalone functions
  This work is sponsored by, and copyright, Google.
  This reduces the code size of libavcodec/aarch64/vp9itxfm_neon.o from
  
  19496 to 14740 bytes.
  This gives a small slowdown of a couple of tens of cycles, but makes
  
  it more feasible to add more optimized versions of these transforms.
  Before :
  
  vp9_inv_dct_dct_16x16_sub4_add_neon :    1036.7
  
  vp9_inv_dct_dct_16x16_sub16_add_neon :   1372.2
  
  vp9_inv_dct_dct_32x32_sub4_add_neon :    5180.0
  
  vp9_inv_dct_dct_32x32_sub32_add_neon :   8095.7
  After :
  
  vp9_inv_dct_dct_16x16_sub4_add_neon :    1051.0
  
  vp9_inv_dct_dct_16x16_sub16_add_neon :   1390.1
  
  vp9_inv_dct_dct_32x32_sub4_add_neon :    5199.9
  
  vp9_inv_dct_dct_32x32_sub32_add_neon :   8125.8
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavcodec/aarch64/vp9itxfm_neon.S

• Playing ffmpeg converted video on Google slides

  1er avril 2019, par user1056585

  I have a PNG image and an MP3 audio file. I’d like to create a video with a still image and use it in a Google slides presentation. From Google’s documentation, these formats (and codecs) are supported : https://support.google.com/drive/answer/2423694?hl=en&co=GENIE.Platform=Desktop

  1) FFMPEG is the easiest tool I can find to make a video from image + audio. But if you have other options, please suggest.
  2) I tried a couple commands :

  ## Command 1
  
  ffmpeg -i image.png -i audio.mp3 -acodec mp3 -vcodec flv1 video9.flv
  
  
  
  ## Command 2
  
  ffmpeg -i image.png -i audio.mp3 -acodec aac -vcodec mpeg4 video7.mov
  
  
  
  ## Command 3
  
  ffmpeg -i image.png -i audio.mp3 -vcodec wmv1 final14.wmv

  But all of these display the error Video cannot be played in Google slides. When I try to play them in Google drive, I get the error Unable to process this video.

  Any thoughts on how I can produce a video file that’ll play in Google slides ?

• Mathematical formula to always center text along X and Y axis ffmpeg python ?

  18 février 2023, par Sixtus Anyanwu

  I am trying to center a text horizontally and vertically with ffmpeg python but I can't seem to get it right. The mid point shifts depending on the amount of characters in the text.

  


  How do I always center the text to the centre of the screen no matter the length of the text ?

  


  Here is my code.

  


  
v_width = 1080

v_height = 1633

def create_video():

    overlay1 = ffmpeg.input("sukuna.gif").filter("scale", 1080, -1, height = 1633 / 2)

    overlay2 = ffmpeg.input("akaza_long.mp4").filter("scale", 1080, -1, height = 1633 / 2 )

    (

    ffmpeg.input('letsgo.mp4')

    .overlay(overlay1)

    .overlay(overlay2, x = 0, y = v_height / 2)

    .drawtext(textfile = "char_names.txt", fontfile = "/storage/emulated/0/PyFiles/Helvetica-Bold.ttf", fontcolor = "yellow", bordercolor = "black", escape_text = True, start_number = 0, fontsize = "80", x = (v_width / 2) - 40, y = (v_height / 2) - 40, borderw = 4, line_spacing = 3)

    .output("newVideo.mp4")

    .run()

    )


  


  The - 40 is for adding some extra padding to the text.

  


  How do I go about this ?

  


  I want the below position always no matter how big or amount of characters in the text.
Centred text

  


  Already tried adding a couple of offset to the text but once the text gets longer, it loses its alignment.