[Ffmpeg-devel] Differences between mencoder and ffmpeg when encoding using x264

[Michael Niedermayer]

Hi

On Sun, Feb 19, 2006 at 01:53:16PM +0100, Erik Slagter wrote:
> I've got this weird problem, it's probably something I overlooked, so
> I'd appreciate some help.
> 
> This command line:
> 
> ffmpeg -bf 16 -deinterlace -t 24 -nr 800 -y -coder 1 -threads 2 -i $1 -qmin 1 -qmax 51 -lmin 1 -lmax 51 -aspect 4:3 -minrate 0 -maxrate 9000 -b 3000 -bufsize 8000 -vcodec h264 -f h264 "$video" -acodec aac -ab 128 "$audio"
> 
> and this command line:
> 
> mencoder -frames 610 -nosound -ovc x264 -of rawvideo -vf "lavcdeint" -mc 0 -x264encopts "bitrate=3000:nr=800:bframes=16:cabac:vbv_maxrate=9000:vbv_bufsize=8000:threads=2" -o $video $vob
> 
> Give very different results, although as far as I can see the relevant
> options are the same. The mencoder command line gives much better
> quality (visually) using the same bit rate, almost no blockyness, while
> the ffmpeg output is full of blocks.

well, remove one option at a time until no removial is possible anymore witout
reducing the diffence in quality

[...]
-- 
Michael