I've been encoding with ffmpeg.exe. Due to the muxing issue, I tried
ffmpeg2theora, but I ran into some issues
1. it fails on 1080p content. 1920x1080. 1920x800 is okay.
2. I have raw yuv. in ffmpeg I use -s 1920x1080 to specify the source
size. ffmpeg2theora doesnt seem to have a way to accept width/height
for the raw yuv (420). So I need to do an additional step of muxing
it into a quicktime or something?
3. -V to set bitrate seems wildly off. Whereas -b in ffmpeg works
pretty well. Even -v for quality factor seems ignored in one of my
clips, and uses way lower (10x) bitrate than I want, and the quality
thereof? Should something like -v 8 be high quality
4. ffmpeg reports errors while decoding
[theora @ 0x3ef4a0]vp3: first frame not a keyframe
Error while decoding stream #0.0
5. quality is visually very poor.. both in my player, and others like
mplayer. Likely due to (3) and (4). If I use ffmpeg to encode the
video, quality is fine.
By decoding with ffmpeg to a file, I run a psnr tool on it and it says
PSNR is 26.318160.
This is using J's latest http://v2v.cc/~j/ffmpeg2theora/download.html
(thanks!)
Here's an overall script you can criticize
:: *************************:: ogg container test matrix::
*************************
oggenc2 -o sync2.ogg sync2.wav
:: *************************:: ogv container test matrix::
*************************
:: Compress with libtheoraffmpeg2theora --optimize -v 8 -o sync.ogv
sync.720x480_30Hz_P420.mov
:: Mux all ogg video container variationsoggzmerge sync2.ogg sync.ogv
-o sync2.ogv
:: Compute PSNRffmpeg -y -i sync2.ogv -vcodec rawvideo -pix_fmt
yuv420p sync_ogv.720x480_30Hz_P420.yuvpsnr -s 720 480
sync.720x480_30Hz_P420.yuv sync_ogv.720x480_30Hz_P420.yuv
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