[FFmpeg-user] overlay and drawtext

[jacky]

Hi

I try to insert a logo as overlay and would like to insert a text on top
the cmd line I am using is
ffmpeg -i smptebars.flv -i uad.png -filter_complex "[0][1]overlay[b];[b] 
drawtext=fontsize=20:fontfile=C:/WINDOWS/Fonts/ARIAL.TTF:=text=hello 
world:x=(w-text_w)/2:y=(h-text_h-line_h)/2"   -y 
smptbars_text_logo.flv       2>log.txt

ffmpeg version N-48731-g7e5c5fa Copyright (c) 2000-2013 the FFmpeg 
developers
   built on Jan 10 2013 19:47:49 with gcc 4.7.2 (GCC)
   configuration: --enable-gpl --enable-version3 --disable-w32threads 
--enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r 
--enable-gnutls --enable-libass --enable-libbluray --enable-libcaca 
--enable-libfreetype --enable-libgsm --enable-libmp3lame 
--enable-libopencore-amrnb --enable-libopencore-amrwb 
--enable-libopenjpeg --enable-libopus --enable-librtmp 
--enable-libschroedinger --enable-libspeex --enable-libtheora 
--enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc 
--enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs 
--enable-libxvid --enable-zlib --enable-filter=frei0r
   libavutil      52. 13.100 / 52. 13.100
   libavcodec     54. 86.100 / 54. 86.100
   libavformat    54. 59.107 / 54. 59.107
   libavdevice    54.  3.102 / 54.  3.102
   libavfilter     3. 32.100 /  3. 32.100
   libswscale      2.  1.103 /  2.  1.103
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  2.100 / 52.  2.100
Input #0, flv, from 'smptebars.flv':
   Metadata:
     encoder         : Lavf54.59.107
   Duration: 00:04:31.20, start: 0.000000, bitrate: 130 kb/s
     Stream #0:0: Video: flv1, yuv420p, 320x240, 200 kb/s, 25 tbr, 1k 
tbn, 1k tbc
Input #1, image2, from 'uad.png':
   Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
     Stream #1:0: Video: png, rgba, 100x95 [SAR 1:1 DAR 20:19], 25 tbr, 
25 tbn, 25 tbc
[drawtext @ 024c6020] Key '/WINDOWS/Fonts/ARIAL.TTF:' not found.
[AVFilterGraph @ 024c83c0] Error initializing filter 'drawtext' with 
args 'fontsize=20:fontfile=C:/WINDOWS/Fonts/ARIAL.TTF:=text=hello 
world:x=(w-text_w)/2:y=(h-text_h-line_h)/2'
Error configuring filters.

I have 3 questions
1- what is the error I made
2- how can I add transparency on png file
3- can I insert the text taken from a text file ?

many thanks for your advices
jacky