[Home]Filter Plugins/Filter Subtitler

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Capabilities

Video Audio RGB YUV YUV422 multiple instances processing type frames needed
yes no yes yes no no POST 1

Introduction

Subtitle renderer.

Parameters

Default values are shown in [green] in square brackets.

no_objects disables subtitler and other objects [off]
color_depth color bit-depth, overriding X auto (24,32) [32]
font ? 1 gives strange symbols (0,1) [0]
font_dir place where font.desc is [$HOME/.xste/fonts]
font_factor outline characters (0.1-100) [10.75]
frame_offset positive (text layer) or negative (earlier) [0]
subtitle_file location of ppml file [$HOME/.subtitles/demo/ppml]
debug prints debug messages [off]
help prints help and exits [off]
use_pre_processing uses pre_processing [off]

Usage Examples

 -J subtitler=...

Author

Jan Panteltje

the following text is from the file filter/subtitler/HOWTO_USE_THIS

This describes how to create subtitles, and how to add these .

This is what I am doing, and I can only speak for that:

I am recording from digital satellite with the Technisat SkyStar 1 PC card, in Linux, with the driver -0.7.1 from www.convergence.de (links to Linux TV), using RedHat 6.1 and kernel 2.2.12-20. On a Tyan VIA based mobo, with DMA enabled, and video 4 linux disabled. (required for this driver).

Recording is done simply with cat /dev/video0 > myfile.pva For one hour, expect 1.8 to 2.5 GB, filesize, depends on picture content and motion.

Then I copy the .pva file to windows 98 SE second release (mounted in Linux). Here I convert the .pva format to .mpg (mpeg2) with Pvastrumento www.offeryn.de

This creates a file myfile.pva.mpg

Pvastrumento also fixes audio video sync (wich is broken in this convergence driver).

Next I go back to Linux, mount the windows disk and do the following with transcode, make a script like this: Usage scriptname myfile.pva.mpg

echo "Extracting sound from $1" transcode \ -i $1 \ -x mpeg2,mp3 \ -y null,divx4 \ -m sound.mp3

echo "Converting sound to 44100 samples / second 16 bits mono wave file"

  1. of cause you can also use 22050 or 11025 audio.
nice -n 15 mpg123 -r 44100 -w sound.wav sound.mp3

echo "Ready use sound.wav for xste" echo "Select WAV audio in xste" exit ---

Now I use the subtitle editor xste www.home.zonnet.nl/panteltje/subtitles/ with this sound file, to create text in sync with the sound.

In xste, from the FILE menu select projects, enter some projectname, here 'myproject'. Then double click on the created entry. xste will complain about non existing configuration files, but just say OK.

xste has created /root/.subtitles/myproject/ and /video/vie/myproject/

In the first go your sound files, better keep your movies in the corresponding /video/vie/myproject/ There are more programs using the xste file directory structure, have not released it all yet, like 'viplay', so for compatibility perhaps.

Now move mv sound.wav /root/.subtitles/myproject/

OK, in xste press AUTO, this should load the audio, and set some edit points. Read the xste documentation.

When finished writing text with xste, select an output file format from the FILE pulldown menu EXPORT SETTINGS, close the export form, press the OUTPUT button, and exit. If all is well, all should now be in sync.

Copy the myproject.ppml file that xste generates to /root/.subtitles/: cp /root/.subtitles/myproject/myproject.ppml /root/.subtitles/ where subtitler will look for it.

Then use the folowing script to create a a divx CD-R micro-dvd. (Here an extra offset of -4 is added to get the subtitles more precisely in sync with the sound, note these are REAL frames, of 40 ms each, so an 80 ms adjustment).

echo "Starting first pass DivX codec" transcode \ -i $1 \ -x mpeg2,mp3 \ -y divx4,null \ -V \ -R 1 \ -w 1550 \ -c 0-100000 \ -J subtitler="color_depth=32 frame_offset=-4 \ subtitle_file=/root/.subtitles/myproject/myproject.ppml" \ -I 3 \ -D 4

echo "Ready pass 1"

  1. echo "Ready PASS 1<<< run pass 2 manually"
  2. exit

echo "Starting second pass DivX codec" transcode \ -i $1 \ -o a1-divx.avi \ -x mpeg2,mp3 \ -y divx4 \ -V \ -R 2 \ -w 1550 \ -I 3 \ -J subtitler="color_depth=32 frame_offset=-4 \ subtitle_file=/root/.subtitles/myproject/myproject.ppml" \ -c 0-100000 \ -D 4

echo "Ready pass 2" exit

You can use -c 3000-8000 to extract a specific part of the source mpg

frame_offset is now always opposite of -D, so if you move to -D 5, you should also move to frame_offset=-5. The TEXT is locked to the start of the picture<< so, if you delay video to get better audio sync (with -D), you should make the subtitles appear EARLIER (with frame_offset a negative number) to keep the text in sync with that audio! -4 4 seems to work best with things converted with pvastrumento in windows. May be different on a different system (mpg audio coder speed?, not sure)

That is all. Linux xine can play the DivX, else to the windows disk or PC with it, and mediaplayer (install DivX4FullInstaller.exe or DivX4CodecInstaller.exe in windows so mediaplayer works on DivX (only tried win 98).

0.8.1: specifying the word: anti_alias on the command line will process emphasis2 as anti alias. Set emphasis2 to grey and emphasis2 contrast to maximum (15) (You can use xste to generate this).


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Last edited February 14, 2005 5:25 am by Jakemsr (diff)
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