Ffmpeg Error Initializing Filter 'drawtext' On Android Project

I try to draw a text on a video using FFMpeg but I have the error: ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers built with gcc 4.8 (GCC) configur

Solution 1:

First You need to specify the FONTCONFIG_FILE to be used in your command. FFMpeg depends on this file to locate fonts and render you text.

Your command will look something like this.

String[] cmd = {"-y" , "-i", SelectedVideo,
                            "-vf", "drawtext=\"FONTCONFIG_FILE=/path/to/configfile.conf:fontfile=/system/fonts/DroidSans-Bold.ttf:text=\'Test Heading\'\"",
                            "-acodec",
                            "copy", Environment.getExternalStorageDirectory()+"/"+Environment.DIRECTORY_MOVIES+"/output.mp4"};

You can find a sample configuration file for android and add it to your project and refer to it.

Here is a sample configuration file:

<?xml version="1.0"?><!DOCTYPE fontconfigSYSTEM"fonts.dtd"><!-- /etc/fonts/fonts.conf file to configure system font access --><fontconfig><!-- Font directory list --><dir>/system/fonts</dir><!-- add your font folders here --><!-- Font cache directory list --><cachedir>.</cachedir><!--
  Accept deprecated 'mono' alias, replacing it with 'monospace'
--><matchtarget="pattern"><testqual="any"name="family"><string>mono</string></test><editname="family"mode="assign"binding="same"><string>monospace</string></edit></match><!--
  Accept alternate 'sans serif' spelling, replacing it with 'sans-serif'
--><matchtarget="pattern"><testqual="any"name="family"><string>sans serif</string></test><editname="family"mode="assign"binding="same"><string>sans-serif</string></edit></match><!--
  Accept deprecated 'sans' alias, replacing it with 'sans-serif'
--><matchtarget="pattern"><testqual="any"name="family"><string>sans</string></test><editname="family"mode="assign"binding="same"><string>sans-serif</string></edit></match><config><!--
  These are the default Unicode chars that are expected to be blank
  in fonts.  All other blank chars are assumed to be broken and
  won't appear in the resulting charsets
 --><blank><int>0x0020</int><!-- SPACE --><int>0x00A0</int><!-- NO-BREAK SPACE --><int>0x00AD</int><!-- SOFT HYPHEN --><int>0x034F</int><!-- COMBINING GRAPHEME JOINER --><int>0x0600</int><!-- ARABIC NUMBER SIGN --><int>0x0601</int><!-- ARABIC SIGN SANAH --><int>0x0602</int><!-- ARABIC FOOTNOTE MARKER --><int>0x0603</int><!-- ARABIC SIGN SAFHA --><int>0x06DD</int><!-- ARABIC END OF AYAH --><int>0x070F</int><!-- SYRIAC ABBREVIATION MARK --><int>0x115F</int><!-- HANGUL CHOSEONG FILLER --><int>0x1160</int><!-- HANGUL JUNGSEONG FILLER --><int>0x1680</int><!-- OGHAM SPACE MARK --><int>0x17B4</int><!-- KHMER VOWEL INHERENT AQ --><int>0x17B5</int><!-- KHMER VOWEL INHERENT AA --><int>0x180E</int><!-- MONGOLIAN VOWEL SEPARATOR --><int>0x2000</int><!-- EN QUAD --><int>0x2001</int><!-- EM QUAD --><int>0x2002</int><!-- EN SPACE --><int>0x2003</int><!-- EM SPACE --><int>0x2004</int><!-- THREE-PER-EM SPACE --><int>0x2005</int><!-- FOUR-PER-EM SPACE --><int>0x2006</int><!-- SIX-PER-EM SPACE --><int>0x2007</int><!-- FIGURE SPACE --><int>0x2008</int><!-- PUNCTUATION SPACE --><int>0x2009</int><!-- THIN SPACE --><int>0x200A</int><!-- HAIR SPACE --><int>0x200B</int><!-- ZERO WIDTH SPACE --><int>0x200C</int><!-- ZERO WIDTH NON-JOINER --><int>0x200D</int><!-- ZERO WIDTH JOINER --><int>0x200E</int><!-- LEFT-TO-RIGHT MARK --><int>0x200F</int><!-- RIGHT-TO-LEFT MARK --><int>0x2028</int><!-- LINE SEPARATOR --><int>0x2029</int><!-- PARAGRAPH SEPARATOR --><int>0x202A</int><!-- LEFT-TO-RIGHT EMBEDDING --><int>0x202B</int><!-- RIGHT-TO-LEFT EMBEDDING --><int>0x202C</int><!-- POP DIRECTIONAL FORMATTING --><int>0x202D</int><!-- LEFT-TO-RIGHT OVERRIDE --><int>0x202E</int><!-- RIGHT-TO-LEFT OVERRIDE --><int>0x202F</int><!-- NARROW NO-BREAK SPACE --><int>0x205F</int><!-- MEDIUM MATHEMATICAL SPACE --><int>0x2060</int><!-- WORD JOINER --><int>0x2061</int><!-- FUNCTION APPLICATION --><int>0x2062</int><!-- INVISIBLE TIMES --><int>0x2063</int><!-- INVISIBLE SEPARATOR --><int>0x206A</int><!-- INHIBIT SYMMETRIC SWAPPING --><int>0x206B</int><!-- ACTIVATE SYMMETRIC SWAPPING --><int>0x206C</int><!-- INHIBIT ARABIC FORM SHAPING --><int>0x206D</int><!-- ACTIVATE ARABIC FORM SHAPING --><int>0x206E</int><!-- NATIONAL DIGIT SHAPES --><int>0x206F</int><!-- NOMINAL DIGIT SHAPES --><int>0x2800</int><!-- BRAILLE PATTERN BLANK --><int>0x3000</int><!-- IDEOGRAPHIC SPACE --><int>0x3164</int><!-- HANGUL FILLER --><int>0xFEFF</int><!-- ZERO WIDTH NO-BREAK SPACE --><int>0xFFA0</int><!-- HALFWIDTH HANGUL FILLER --><int>0xFFF9</int><!-- INTERLINEAR ANNOTATION ANCHOR --><int>0xFFFA</int><!-- INTERLINEAR ANNOTATION SEPARATOR --><int>0xFFFB</int><!-- INTERLINEAR ANNOTATION TERMINATOR --></blank><!--
  Rescan configuration every 30 seconds when FcFontSetList is called
 --><rescan><int>30</int></rescan></config></fontconfig>

If you need to access fonts stored in another folder (other than system/fonts) you must add your folder to the configuration file.