Видео кодируется с ускорением

#!/bin/bash
 
fout="/home/peter-irich/encode_y4m_mka_from_makemkv.out"
/bin/date > $fout
declare -a nam_arr
cntf=0
while read flnm ; do
 nam_arr[$cntf]=$flnm
 echo $cntf ${nam_arr[$cntf]}
 echo $cntf ${nam_arr[$cntf]} >> $fout
 let cntf++
done < /home/peter-irich/mkv.lst
 
dirs="/media/peter-irich/Seagate_4TB/nobody/mkv_files"
cnti=0
cd $dirs
while [ $cnti -lt $cntf ] ; do
 namf=${nam_arr[$cnti]}
 namm=`echo $namf | /usr/bin/cut -d "." -f 1`
 
 /bin/date >> $namm.time
 echo "namm="$namm >> $namm.time
 echo "namm="$namm >> $fout
    /bin/date > $namm.time
    /bin/date >> $fout
 
    /usr/bin/mediainfo $dirs/$namm.mkv > $namm.info
    /usr/bin/mediainfo $dirs/$namm.mkv >> $fout
    naud=`/usr/bin/mediainfo $dirs/$namm.mkv | /bin/grep -c ^Audio`
    nw1=`/usr/bin/mediainfo $dirs/$namm.mkv | /bin/grep Width | \
/usr/bin/tr -s " " | /usr/bin/cut -d " " -f 3`
    nw2=`/usr/bin/mediainfo $dirs/$namm.mkv | /bin/grep Width | \
/usr/bin/tr -s " " | /usr/bin/cut -d " " -f 4`
    if [ "$nw2" = "pixels" ] ; then
     nw=$nw1
    else
     let nw2=10#${nw2}
     let nw=1000*nw1+nw2
    fi
    nh1=`/usr/bin/mediainfo $dirs/$namm.mkv | /bin/grep Height | \
/usr/bin/tr -s " " | /usr/bin/cut -d " " -f 3`
    nh2=`/usr/bin/mediainfo $dirs/$namm.mkv | /bin/grep Height | \
/usr/bin/tr -s " " | /usr/bin/cut -d " " -f 4`
    echo $nw1 $nw2 $nw "nh1="$nh1 "nh2="$nh2 $nh
    echo $nw1 $nw2 $nw "nh1="$nh1 "nh2="$nh2 $nh >> $fout
    if [ "$nh2" = "pixels" ] ; then
     nh=$nh1
    else
     let nh2=10#${nh2}
     let nh=1000*nh1+nh2
    fi
echo $nw1 $nw2 $nw $nh1 $nh2 $nh
    echo $namm.mkv "naud="$naud $nw $nh
    echo $namm.mkv "naud="$naud $nw $nh >> $fout
 
/usr/bin/ffmpeg -i $dirs/$namm.mkv -an -sn -map 0 -vsync 2 -strict -1 \
-f yuv4mpegpipe ${namm}.y4m > ${namm}_y4m.err 2>&1 
 
#/usr/bin/ffmpeg -i $dirs/$namm.mkv -an -sn -strict -1 -f yuv4mpegpipe \
#${namm}.y4m > ${namm}_y4m.err 2>&1 
 
    echo $namm "y4m was build"
    echo $namm "y4m was build" >> $namm.time
    echo $namm "y4m was build" >> $fout
    /bin/date >> $namm.time
    /bin/date >> $fout
 
    /usr/bin/x265 --log-level warning --input-res ${nw}x${nh} --preset \
veryslow -o ${namm}_cmpr_v.mkv ${namm}.y4m > ${namm}_cmpr_v.err 2>& 1
    /bin/ls -l ${namm}.y4m >> $namm.time
    /bin/rm -f ${namm}.y4m
 
    echo $namm "cmpr_v.mkv was build"
    echo $namm "cmpr_v.mkv was build" >> $fout
    echo "$namm cmpr_v.mkv was build" >> $namm.time
    /bin/date >> $namm.time
    /bin/date >> $fout
    cnt=0
    while [ $cnt -lt $naud ] ; do
     prf=""
     if [ $cnt -lt 10 ] ; then
        prf="0"
     fi
     nmb=${prf}$cnt
     echo $nmb
     echo $nmb >> $fout
     echo $nmb >> $namm.time
 
     /usr/bin/ffmpeg -i $dirs/$namm.mkv -map 0:a:$cnt -c:a ac3 \
${namm}_$nmb.ac3 > ${namm}_$nmb.err 2>&1
     /usr/bin/mkvmerge -o ${namm}_$nmb.mka ${namm}_$nmb.ac3
 
     let cnt++
     /bin/date >> $namm.time
     /bin/date >> $fout
    done
 
    echo "mkv_end" >> $namm.time
    echo "mkv_end" >> $fout
    let cnti++
done
 
cd /home/peter-irich
/usr/bin/sync
/usr/bin/umount /media/peter-irich/Seagate_4TB
/usr/bin/udisksctl power-off -b /dev/sdb
/usr/bin/sudo /usr/sbin/shutdown -h +0