i’m very pleased that after years of hacks here and there, all three heads of the current codebases pretty well build natively on mac (snow leopard) for
- x264
- ffmpeg
- mplayer
here, i’m making sure that i compile in static version of libvpx (Webm) and libx264 (h.264) video packages so that the ffmpeg can easily make hiqh quality h.246 and webm transcoded videos.
https://archive.org/~tracey/downloads/macff.sh
So we can make nice (2 pass video) ~768 kb/sec 640×480 derivatives like so (alter -r .. as appropriate):
make WebM
ffmpeg -deinterlace -y -i 'camels.avi' -vcodec webm -fpre libvpx-360p.ffpreset \
-vf scale=640:480 -r 20 -threads 2 -map_meta_data -1:0 -pass 1 \
-an tmp.webm
ffmpeg -deinterlace -y -i 'camels.avi' -vcodec webm -fpre libvpx-360p.ffpreset \
-vf scale=640:480 -r 20 -threads 2 -map_meta_data -1:0 -pass 2 \
-acodec libvorbis -ab 128k -ac 2 -ar 44100 tmp.webm
mv tmp.webm 'camels.webm'
make h.264
ffmpeg -deinterlace -y -i 'camels.avi' -vcodec libx264 -fpre libx264-IA.ffpreset \
-vf scale=640:480 -r 20 -threads 2 -map_meta_data -1:0 -pass 1 \
-an tmp.mp4
ffmpeg -deinterlace -y -i 'camels.avi' -vcodec libx264 -fpre libx264-IA.ffpreset \
-vf scale=640:480 -r 20 -threads 2 -map_meta_data -1:0 -pass 2 \
-acodec aac -strict experimental -ab 128k -ac 2 -ar 44100 tmp.mp4
qt-faststart tmp.mp4 'camels.mp4'
our preset files:
https://archive.org/~tracey/downloads/libvpx-360p.ffpreset
https://archive.org/~tracey/downloads/libx264-IA.ffpreset
Nice things about the h.264 derivative:
- plays on all iphones and ipads
- browser video tag and/or flash plugin compatible
- starts immediately, seeks immediately even before entire video is downloaded
hope this may be useful!
Comments
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Check out the improved python version of qtfaststart on github too.
https://github.com/danielgtaylor/qtfaststart
tracey pooh
thanks for the tip.
i did check w/ the original author and his site at
http://multimedia.cx/eggs/improving-qt-faststart/ where he seems to suggest/prefer the bundled source w/ ffmpeg.
it seems most of the issues people have had with the C aspect of qt-faststart relate to 32bit vs 64bit compiling — which we don’t really have to worry about in our setup when compiling from ffmpeg as instructed. (and having been “raised on C”, i don’t have any major issues w/ C vs. python.
was there something compelling otherwise about the python variant you liked?