.srt issue : text disappears

[Alan Pope]

Hi,

On Fri, 2007-10-12 at 10:48 -0400, heathenx wrote:

> For fear that I am butting into a project in which I do not contribute, what is your goal for 
> encoding video? Are you trying to find common ground between file size and video clarity?
> 

Clarity is the primary goal. File size less so but of course we do need
to be conscious of those with limited bandwidth connections.

I have been playing with encoding quite a bit, and to be honest having
the videos available in many formats adds a fair headache. Tips great
fully received.

In a nutshell I do this:-

For MOV / h264 / aac, two pass 640x360, 968x544, 1280x720

time /usr/local/bin/ffmpeg -y -i $1.* -vcodec libx264 \
     -s 640x360 -b 400k -r 10 -acodec libfaac -pass 1 \
     -ar 22050 -ab 128k -f mov mov/$1_h264_400k_aac_640x360.mov
time /usr/local/bin/ffmpeg -y -i $1.* -vcodec h264 \
     -s 640x360 -b 400k -r 10 -acodec mpeg4aac -pass 2 \
     -ar 22050 -ab 128k -f mov mov/$1_h264_400k_aac_640x360.mov


For Ogg / Theora / Vorbis at 512x288, 768x432, 1280x720

time ffmpeg2theora $1.* -x 512 -y 288 -v 7 -V 400 \
    --aspect 16:9 --license cc-by-sa-3.0 \
    --organization "Ubuntu Screencast Team" \
     -o ogg/$1_theora_400k_vorbis_512x288.ogg

For AVI / XVid / MP3, two pass 640x360, 968x544, 1280x720


time /usr/local/bin/ffmpeg -y -i $1.* -vcodec libxvid \
     -s 640x360 -b 400k -r 10 -acodec libmp3lame -pass 1 \
     -ar 22050 -ab 128k -f avi avi/$1_xvid_400k_mp3_640x360.avi
time /usr/local/bin/ffmpeg -y -i $1.* -vcodec libxvid \
     -s 640x360 -b 400k -r 10 -acodec libmp3lame -pass 2 \
     -ar 22050 -ab 128k -f avi avi/$1_xvid_400k_mp3_640x360.avi


For Flash / Flv / MP3, two pass 640x360, 968x544, 1280x720


time /usr/local/bin/ffmpeg -y -i $1.* -vcodec flv \
     -s 640x360 -b 400k -r 10 -acodec libmp3lame -pass 1 \
     -ar 22050 -ab 128k -f flv flv/$1_xvid_400k_mp3_640x360.flv
time /usr/local/bin/ffmpeg -y -i $1.* -vcodec flv \
     -s 640x360 -b 400k -r 10 -acodec libmp3lame -pass 2 \
     -ar 22050 -ab 128k -f flv flv/$1_xvid_400k_mp3_640x360.flv


Suggestions welcome!

Note, I am using ffmpeg compiled from source:-

Get dependencies to compile ffmpeg:-

sudo apt-get install liba52-dev libdts-dev libgsm1-dev libvorbis-dev
libxvidcore4 libxvidcore4-dev libdc1394-dev libfaac-dev liblame-dev
libx264-dev libfaad2-dev libtheora-dev libsdl1.2-dev 

Get source for ffmpeg:-

wget http://ffmpeg.mplayerhq.hu/ffmpeg-export-snapshot.tar.bz2
tar jxvf ffmpeg-export-snapshot.tar.bz2
cd ffmpeg-export-*

./configure --enable-gpl --enable-pp --enable-pthreads \
            --enable-libvorbis --enable-libogg --enable-liba52 \
            --enable-libgsm  \
            --disable-debug --enable-shared --enable-libxvid \
            --enable-libfaac --enable-libmp3lame \
            --enable-libx264 --enable-libfaad --enable-libtheora \
             --enable-x11grab --enable-swscaler \
              --prefix=/usr/local

make
sudo make install

Cheers
Al.
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