Offline files management on linux / tree command

Use the following script to save directory tree to a text file for further reference. Useful for offline/backup storages.

treecmd.sh

tree -a -x -h --du $1
df -h $1

ffmpeg transcode bash example

#!/bin/sh
# [-map 0:... -map 0:...]
FFMPEG="${HOME}/ffmpeg-3.0.2/ffmpeg"
INPUT_FN="$1"
OUTPUT_FN="$2"
shift 2
time "$FFMPEG" -strict -2 -i "$INPUT_FN" "$@" -c:v nvenc_h264 -preset slow -b:v 2000k -ac 2 -c:a libmp3lame -b:a 128k -c:s  copy "$OUTPUT_FN"

transcoding using nvenc ffmpeg

./ffmpeg -i /mnt/file.avi -c:v nvenc_h264 -preset slow -b:v 2000k -c:a libmp3lame testnvenc.mp4
ffmpeg version 3.0.2 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.3.1 (Ubuntu 5.3.1-14ubuntu2.1) 20160413
  configuration: --enable-opencl --enable-opengl --enable-nvenc --enable-nonfree --prefix=/home/y/ --extra-cflags='-I /home/y/nvidia_video_sdk_6.0.1/Samples/common/inc' --enable-libmp3lame

A2DP under Linux

Install pulseaudio-bluetooth.
Pair device via GUI.
run hciconfig up
Connect device via GUI as Audio sink.
Use Pulse Audio Control GUI.

Archlinux on HP 6510b

Install packages: rfkill, hdparm

rfkill to enable wifi

Custom systemd unit for hdparm via systemd After=sleep.target:

/etc/systemd/system/myhdparm.service
[Unit]
Description=set hdparm for sda
After=default.target sleep.target

[Service]
type=oneshot
ExecStart=/etc/systemd/system/sethdparm.sh

[Install]
WantedBy=default.target sleep.target


/etc/systemd/system/sethdparm.sh
#!/bin/bash
sleep 2
hdparm -B 253 /dev/sda

Blender frameserver and ffmpeg

 rm ffmpeg2*log*
date
echo starting blender
blender -b edr.blend -F FRAMESERVER -s 1 -e 300 --render-anim &
sleep 2
date
echo starting ffmpeg pass1
source "frameserver_pass1.sh"
sync
date
echo starting blender2
blender -b edr.blend -F FRAMESERVER -s 1 -e 300 --render-anim &
sleep 2
date
echo starting ffmpeg pass2
source "frameserver_pass2.sh"
sync
date
echo finished, going to sleep...

# systemctl suspend




-=-=-=-=-

BLENDER=http://localhost:8080
OUTPUT='-f null /dev/null'
CODEC_OPTS="-pix_fmt yuv420p -profile:v high -level 4.0 -vcodec libx264 -preset slow -b:v 12500k "
# -preset slow -profile:v high -level 4.0"
eval `wget ${BLENDER}/info.txt -O - 2>/dev/null |
    while read key val ; do
          echo R_$key=$val 
              done`
              i=$R_start
              {
                while [ $i -le $R_end ] ; do
                       wget ${BLENDER}/images/ppm/$i.ppm -O - 2>/dev/null
                              i=$(($i+1))
                                done
                                } | ffmpeg -vcodec ppm -f image2pipe -r $R_rate -i pipe:0 $CODEC_OPTS -pass 1 -threads 6 $OUTPUT
                                wget ${BLENDER}/close.txt -O - 2>/dev/null >/dev/null

Best picture viewer for linux

nomacs,
eye of gnome