[mythtv-users] Nuvexport-divx doesn't seem to recognize v_bitrate

Anthony Giggins seven at seven.dorksville.net
Tue Nov 20 01:44:43 UTC 2007

> After numerous failed attempts at using nuvexport to make myself an avi
> divx
> file with ffmpeg as a userjob, I ran it from the commandline and tested it
> on a small file I had using various settings.  I was noticing that no
> matter
> what I set my bitrate to, the file produced always looked like garbage,
> like
> it was VERY low quality.
> I ran the following lines and looked at what they produced:
> nuvexport --ffmpeg --infile=/storage/recordings/1019_20071117192531.mpg
> --path=/storage/ --width=640 --height=480 --mode=divx --deinterlace
> --nonoise_reduction --noconfirm --nice=19 --a_bitrate=192 --v_bitrate=1000
> nuvexport --ffmpeg --infile=/storage/recordings/1019_20071117192531.mpg
> --path=/storage/ --width=640 --height=480 --mode=divx --deinterlace
> --nonoise_reduction --noconfirm --nice=19 --a_bitrate=192 --v_bitrate=5000
> I then moved /etc/nuvexportrc and /home/mythtv/.nuvexportrc to backup
> positions and reran the two commands.
> All 4 commands produced practically the same sized file (they were about
> 1000 bytes off of a 3 MB file).  The compression was about 6x (3 MB from
> 18
> MB).  Yet they all looked the exact same in terms of quality.
> I didn't get a drastically different sized file until I set
> --v_bitrate=5000000, which gave me a 10 MB file for slightly less than 2x
> compression.  The individual frame resolution was good, but the video was
> unwatchable.
> I would love to have my mythtv produce divx files as a userjob, but right
> now the divx files produced look like garbage.
> Brian Phillips
I'm using the settings below which creates some nice quality xvid files
I'm just having some issues getting this to run as a userjob, it works
fine from the command line,

nuvexport --mencoder --infile=$VIDEODIR/$FILENAME
--path=/storage/videos/new --height=576 --width=720 --mode=xvid --
deinterlace --nonoise_reduction --cutlist --noconfirm --nice=19

my /etc/nuvexportrc Xvid declaration is

    vbr          = yes
    multipass    = yes
    quantisation = 6
    a_bitrate    = 128
    v_bitrate    = 768
    width        = 720
    height       = auto


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