[FFmpeg-user] ffv1 encode 65% of vp9 ?

[sean darcy]

I've got a bunch of old movies I'm reencoding and archiving. They're 
mpeg2 in mkv. So I ran 2 pass vp9 and ffv1 :

6432740173 Apr 30 17:46 my-movie.mkv
  718020678 May  8 19:30 my-movie.nut
1119231613 May  1 00:30 my-movie-vp9.mp4

I've never used ffv1 before. Is this expected ? Is it really this 
effective as a lossless encoder ?

Or have I done something stupid ?

sean

vp9 cmd :
#!/bin/bash

Infile=my-movie

Options='-r 24000/1001 -c:v libvpx-vp9 -b:v 0 -crf 29 -row-mt 1 -threads 
8 -tile-columns 6 -frame-parallel 1'

ffmpeg -i "$Infile".mkv $Options -pass 1 -speed 4  \
    -g 9999 -aq-mode 0 -an -f webm /dev/null -y

ffmpeg -i "$Infile".mkv $Options -pass 2 -speed 1  \
    -auto-alt-ref 1 -lag-in-frames 25 \
    -g 9999 -aq-mode 0 -c:a copy "$Infile"-vp9.mp4


ffv1 cmd:

Infile="$1"
ffmpeg -i $Infile.mkv -c:v ffv1 -level 3 -threads 8 -coder -2 -context 1 \
  -pass 1 -passlogfile ffv1_passlog  \
  -an -f nut /dev/null -y  -loglevel info

ffmpeg -i $Infile.mkv -c:v ffv1 -level 3 -threads 8 -coder -2 -context 1 \
   -pass 2  -passlogfile ffv1_passlog  \
   -map 0:1 -map 0:2 -c:a copy "$Infile".nut -loglevel info