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• 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.

  


• ASS/SSA subtitles hard coded using ffmpeg are highly antialiased

  1er août 2024, par Adorn

  I am using ASS/SSA format for hard coding captions on the video. These are relevant parts of my .ass file :

  


  Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: s0, Montserrat-Black, 60, &H0015CCFA, &H001C1CB9, &H77000000, &H00000000, 1, 0, 0, 0, 100, 100, , 0, 1, 2, 2 , 2, 0, 0, 0, 1

[Events]
Format: Start, End, Style, Text
Dialogue: 00:0:43.8,00:0:46.55,s0,{\pos(540,1550)\fscx50\fscy50\t(0,100,\fscx100\fscy100)\org(10540,-8450)\t(100,600,\frz0.10)\t(600,1100,\frz-0.10)\t(1100,1600,\frz0.10)\t(1600,2100,\frz-0.10)\t(2100,2600,\frz0.10)\t(2600,3100,\frz-0.10)\t(3100,3600,\frz0.10)\k3463}ME FOR WHATEVER


  


  And to hard code on the video, I use following ffmpeg command :

  


  ffmpeg -i video_filepath -vf ass={ass_filepath} -c:a copy -y out_path


  


  This works as intended, except the captions are highly antialiased.

  


  

  


  By the way, no AI Assistant has solved this. Tried ChatGPT / Claude / llama 3.1.

  


• How to load external or custom fonts in subtitle file

  19 novembre 2020, par Konduri Sai Aditya

  How to load fonts in .ass subtitle file from an external file path/custom path ? Suppose I have a font in a folder, and I need to load that font in subtitle file(.ass) file. how to load it ? Is there any possibility ?
FFmpeg command is

  


  ffmpeg -i sample.mp4 -map 0 -vf "subtitles=test.ass:fontsdir=Dancing_Script.ttf" -c:a copy output.mp4


  


  Above is my .ass file

  


  [Script Info]
; Script generated by Aegisub 3.2.2
; http://www.aegisub.org/
Title: Default Aegisub file
ScriptType: v4.00+
WrapStyle: 0
ScaledBorderAndShadow: yes
YCbCr Matrix: None

[Aegisub Project Garbage]

[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: Default,Arial,20,&H00FFFFFF,&H000000FF,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,2,2,8,10,10,10,1


[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.00,0:00:05.00,Default,,0,0,0,,first{\fnDancing Script\b0}


  


  Problem is video is still loading Arial Font even I load with \fnDancing Script\b0