BIPEDU

my ideas in action

use ffmpeg to edit videos

I want to show here how to produce a video and what are the steps to post-production.

All these are using free and open source software. No need to be expert in computers , only a little bit of courage.

You can use this recipe for homemade videos that you post online, for your vlog/blog or whatever.

I use ffmpeg and Inkscape that are available for Linux and Windows also.

As a general rule, if you have Linux/Unix, then please use the RAM since it is faster (read/write in /tmp folder always for all temporary files).

 

These are the steps :

1= record the video + audio

use a decent camera (preferable HD or 4K) with preferable audio . DSLR is OK also.

If your camera do not have good audio recording from builtin mic, then record the audio separate and clap in front of camera so that you can synchronize video/audio in post-production. Preferably use an external microphone ( ex. lavalier) as close as possible of the sound source. A cheap and good lav mic is Boya BM-M1 (see Amazon)

You can also record with a smartphone but be aware that the sample rate may be 44100 instead of 48000 as camera will record. This may produce audio that is not in sinc with video.

During recording please keep 5-10 seconds of silence , because you may need it later to do some noise reduction (see next step)

2= extract the audio separated and do some processing (if necessary)

Personally I use Audacity ( free and open source) .

I import audio and I do mainly two operations : Noise reduction and Compression. I use default settings from Audacity .. are ok for most cases. In case the audio sample rate is on 44100 then it is preferable to change it to 48000 to match the video.

Save the audio as WAV ( 16bit) in 48000.

3= then replace the video old audio with the new audio (new audio is with noise reduction)

3.1 = strip the audio from the video

ffmpeg -i /tmp/DSC_0009.MOV -an -c:v copy -c:a copy /tmp/p1.mov

3.2 = add new audio to the video

ffmpeg -i /tmp/p1.mov -i /tmp/DSC_0009.wav -vcodec copy -acodec copy /tmp/p2.mov

 

4= cut the video to the correct size

play first the new video and check the quality and note on paper the moments you want to save. For example : from 00:01:12 till 00:25:48 (hh:mm:ss format)

use example : cut from 20 sec till 9min and 36sec :

ffmpeg -i /tmp/p2.mov -vcodec copy -acodec copy -ss 00:00:20 -to 00:09:36 /tmp/p3.mov

5= (optional) add some logo/title/watermark

5.1 = Create the logo

With Inkscape (free and open source) create a image that has the same format as the video. Example if video is HD 1920*1080 then create a page that is 1920*1080. On this place your logo/watermark / artwork and preferable use alpha (transparency) to get more effect. Save the work and export it to PNG and keep the transparency.

5.2 = Overlay the PNG image to the video with ffmpeg

ffmpeg -i /tmp/p3.mov -loop 1 -i /tmp/TitleFile.png -filter_complex “[1:v]fade=in:st=0:d=0.1:alpha=1,fade=out:st=9:d=1:alpha=1[png];[0:v][png]overlay=x=0:enable=’between(t,0,10)'” -b:v 2000k -bufsize 2000k /tmp/p4.mov

Here I overlay the PNG image from second 0 ( st=0) in 0.1sec (d=0.1) and then fadeout starting at second 9 (st=9) for 1 second (d=1). The entire overlay is from seconds 0 to 10 ( see : between(t,0,10) ). Then I also force bitrate to be 2Mb/s (-b:v 2000k -bufsize 2000k) to avoid too much loss of quality. If not the ffmpeg will reduce the bitrate even more and it may be too low.

 

6= (optional) add a static picture at the final with credits/ links/Thanks or other announcements

6.1 = use Inkscape to create a closing image. Same as before, can use transparency (alpha) .

6.2= use ffmpeg to create and concatenate the image at the end of the video:

ffmpeg -i /tmp/p4.mov -loop 1 -framerate 30 -t 5 -i /tmp/Closing.png -f lavfi -t 0.1 -i anullsrc=channel_layout=stereo:sample_rate=48000 -filter_complex “[0:v][0:a][1:v][2:a]concat=n=2:v=1:a=1” -b:v 2000k -bufsize 2000k /tmp/final.mov

options :

framerate=30 : need to match the original framerate of your video ( if you shoot in 60FPS then use 60 here also)

t 5 : generate 5 seconds video that will show your Closing.png image

stereo : add stereo sound if youd video is stereo ( if not you can put mono)

sample_rate=48000 : use the same sample rate as your audio (other option is 44100)

 

7=(optional) post the video online ( Ex: Youtube, Vimeo……etc)

 

 

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new lessons on analog CMOS design

Recently I’m working on some free lessons / courses on electronics.

More specifically on custom analog CMOS design.

I think is better to share my knowledge with others. I try to present detailed design with accent on the principle, methods and trade-offs.

My first is about designing a CMOS analog opamp , with full rail-to-rail inputs and outputs.

I go from easy to hard and I hope to be easy for everyone to understand reasons and the decisions that are made during design process.

 

For the moment I have only few 10 minutes video…. I will add more soon.

 

Good movies

Miss Sloane

Contratiempo – Spain 2016

Gone Girl (2014, with Ben Affleck) – tension, thriller

 

incremental backup of Freenas ZFS volume on external drive

When you have a Freenas  you need sometime to make a backup of the entire volume.

I have a external HDD drive ( connected with a  USB interface). I want to have a exact replica of the entire Freenas dataset so that I can store it on a remote location. The GUI menu from Freenas allow you to do this but as a scheduled replication task . This is nice if you have another NAS connected on the network. In my case I have just a external HDD (1TB) and I want to make a backup from time to time.

First connect external HDD on Freenas USB ports. Plug the cable and then from GUI go to Storage–> Volume–> import Volume.

In the new pop-up select the ZFS volume from your HDD. If you do not have a volume yet then you can create it from GUI .

Now you have to open a terminal because next commands are not possible from GUI.

So you can open the Shell from GUI Freenas  ( left side menu) or you can use a SSH to access directly the Freenas terminal.

In the Freenas terminal you need first to check if you see correctly the NAS volumes and also the new inserted external HDD volume.

zfs list –> to see all volumes available

then type :

zfs list -t snapshot –> to see what snapshots you have on your system.

First time when you make this transfer you will need to copy a lot of data since external HDD is empty . Do not worry because next time when you make backup only the difference data will be copied. So it will be much faster.

So first time do:

zfs snapshot -r data1/bsdshare@backup # create a snapshot
zfs send -R data1/bsdshare@backup | zfs receive -vF bkp_1T # transfer it over

where:

zfs snapshot = create a snapshot of the data

-r = snapshot is recursive

data1/bsdshare = my volume is “data1″ and dataset is”bsdshare”

backup = arbitrary name for my snapshot. (you can see it also in GUI on Storage–>Snapshot)

zfs send = copy the dataset

zfs receive = paste the dataset

bkp_1T = is the name I chose for my external HDD volume ( choose any name you like)

The zfs send/receive command take very long time  !! hours !! since will copy now the entire data. May be longer/shorter depending on the total data, HDD speed, USB interface..etc.

At the end , after the send/receive finished you can detach the external volume from GUI . Go to Storage–> Volumes, click on the “bkp_1T” and select “detach”.  Now you can unplug the external HDD and you are ready.

 

Next time when you want to update the data from external HDD you need to do the following. The idea is to make a incremental update so that you do not spend hours copying entire data again . For this we will do:

First plug the external HDD on USB port. ( Notice that Freenas do not require any reboot !!, all is live)
From GUI import volume . Go to Storage –> Volumes –> import volume. Select the volume from your HDD ( mine is called “bkp_1T”)

Now open again a terminal in Freenas ( from GUI menu or with SSH) and type:

zfs rename -r data1/bsdshare@backup   data1/bsdshare@backup_old

# rename the “old” snapshot made last time from “backup” into “backup_old”.

zfs snapshot data1/bsdshare@backup # take a new snapshot
zfs send -Ri data1/bsdshare@backup_old data1/bsdshare@backup | zfs receive -v bkp_1T # incremental replication

Notice that now we use -i and we add both snapshot ( old and new) for send command. Now only the delta between old-new will be copied to HDD so it should take seconds or minutes, not hours/days.

At the end check one more time ( from GUI or terminal) that sizes, disks and snapshots are ok . If OK then you can optionally cleanup the storage by removing the old snapshots from Freenas and also from external HDD.

zfs destroy -r data1/bsdshare@backup_old # get rid of the previous snapshot from Freenas
zfs destroy -r bkp_1T@backup_old # get rid of the previous snapshot from external HDD

At the end from GUI you can detach the external HDD ( Storage–> Volumes , click on volume and select detach)

That’s it !

 

use PAC file for automatic proxy selection

I will explain how to use automatic proxy selection for a local network.

For example let’s say that you have a proxy server but that proxy is not available all time. In this case the you need to find each time if the proxy is alive (available) and if yes to use it. If not then browser will select direct connection.

The easiest way to use it is to create a PAC file and to add it in the Firefox as automatic proxy selection.

Go to Preferences–>Advanced –> Network –>Settings and choose “Automatic proxy configuration URL”

Then type there the path to a local PAC file. Normally there should be a web page address but if the file is locals works also ( no web server needed)

FFsettings

To create the PAC file use any text editor and create a file called “autoproxy.pac” and put this content:

function FindProxyForURL(url, host)
{
return “PROXY 192.168.1.29:3128; DIRECT”;
}

The Proxy in this case is on local network at 192.168.1.29 (Squid Proxy on port 3128) and Firefox try to use it first . In case it is not responding it will use direct connection.

You can set there multiple proxy servers. The order is important.

In the example below you can have two proxies. If the first one (192.168.1.29) is not responding then the second one (192.168.1.42) will be selected, and if the second one also do not respond the direct network connection will be used.

function FindProxyForURL(url, host)
{
return “PROXY 192.168.1.29:3128; PROXY 192.168.1.42:3128; DIRECT”;
}

The name of the PAC file is not important ( “autoproxy.pac” is name used by me), any name will do.

More details regarding the PAC file , examples, more advanced functions can be found here : http://findproxyforurl.com/

 

 

 

Fixing “RPC: AUTH_GSS upcall timed out.” from dmesg ( Debian and other linux distro)

In case you see this in your dmesg then please read further. The issue is also giving slow connection ( first) time on a NFS share (takes ~30seconds ).

There is a bug (!?) in the NFS client configuration and it runs a module called rpcsec_gss_krb5.

You can check if this module is running with “lsmod”.

Solution : do not load the module :

as root type :

echo blacklist rpcsec_gss_krb5 > /etc/modprobe.d/dist-blacklist.conf

then reboot

Problem solved : fast connection on NFS share and no dmesg error message.

 

 

email me the result of a cronjob/script in Freenas

This is the simplest method to email the result of a command in Freenas.
For example if you run certain scripts with Cron you can use it also.

Personally I use this to get the SMART report about a HDD that may fail soon. So what I put in Cron this (all in one line) :

smartctl -a /dev/ada1 | /usr/bin/mail -s "MyFREENAS HDD /ada1 report " my.email@address.com

For user you can put “root” and any redirect should be off.

Of course to make the email work you have to configure the email server, ..etc… in the user config. Fill the settings here : System –> Email.

for all spammers in the world !

how to add/replace disk to FreeNAS mirror

I recently had to add new disks to my FreeNAS storage. I mounted the disks but I was not able to add them as mirror from GUI interface. But I found this Russian website with very simple and easy to follow tutorial. I copied here mainly for me as a reminder but may be also useful for others.

I hope the original author will not be upset.

The original post is here :
http://ukhov.ru/node/431


The high-level steps are:

Add the new disk to the system – (means connect the cables)
Partition the disk with gpart – (from FreeNAS terminal)
Attach the new partition to ZFS as a mirror

Create the GPT

Use the GUI to find the device ID of the new drive or use camcontrol.

# camcontrol devlist
at scbus2 target 0 lun 0 (ada0,pass0)
at scbus3 target 0 lun 0 (ada1,pass1)
at scbus4 target 0 lun 0 (ada2,pass2)
at scbus5 target 0 lun 0 (ada3,pass3)
at scbus7 target 0 lun 0 (da0,pass4)

let assume that our target is ada1. Create the GUID partition table for ada1.

# gpart create -s gpt ada1
ada1 created


Add the Swap Partition

Create a swap partition matching what FreeNAS created on the original drive. FreeNAS puts a swap partition on every data drive by default, stripes them together, and encrypts with a temporary key each boot. I’m not sure how that works when a drive fails, but it’s the recommended configuration.

# gpart add -b 128 -i 1 -t freebsd-swap -s 2G ada1
ada1p1 added

Add the Data Partition

Use the remaining space for the data partition.
# gpart add -i 2 -t freebsd-zfs ada1
ada1p2 added

Get the GPTID for the Partition

A device may change names depending on the connected port but the GPTID doesn’t change. FreeNAS uses the GPTID to track disks and so we want the rawuuid field of ada1p2.


# gpart list ada1
Geom name: ada1
scheme: GPT
1. Name: ada1p1
Mediasize: 2147483648 (2.0G)
...
rawuuid: 38d6835c-4794-11e4-b95b-08606e6e53d5
2. Name: ada1p2
Mediasize: 1998251364352 (1.8T)
...
rawuuid: 40380205-4794-11e4-b95b-08606e6e53d5

Attach to ZFS as mirror

Attach the partition using zpool which will begin the resilvering process. You will need the GPTID of the encrypted original disk parition.

# zpool attach
# zpool attach storage /dev/gptid/1c5238f9-5e2d-11e3-b7e0-08606e6e53d5 /dev/gptid/40380205-4794-11e4-b95b-08606e6e53d5

auto mount your NAS share

I have discovered a better way on mounting the NAS shares .

Previously I was using /etc/fstab but this was not very convenient.

So I found “autofs”. It is taking care of automounting the CD/DVD/ external shares (NFS/CIFS, etc) based on the usage. I mean that when you click on the folder then it will mount it , but when not using the mount folder then at a predefined timeout time it will umount it . This is a good feature for me since I wanted to unmount automatically when I do not use that share.

 

So after installing the autofs ( from repository) then you have to configure two files.

 

First is /etc/auto.master. You should put here the timeout setting and the mount directory.

If you have more mounting paths you can put different timeout settings.

My example below:

file:   /etc/auto.master

+auto.master
/mnt/nfsfreenas /etc/auto.misc --timeout 60 --ghost

The second file is /etc/auto.misc . This contain the mount settings ( somehow similar with /etc/fstab file)

My example file here:

file : /etc/auto.misc

bsddataset    -fstype=nfs,soft,sync,rsize=6000,wsize=6000    192.168.1.20:/mnt/data1/bsdshare

So what I have here is a Freenas Unix share on 192.168.1.20 ( bsdshare) that is NFS type.

You can put in this file the CIFS/Samba also or sshfs or other shares. CD/DVD disks work also.

at the end , after updating this two files with your setup please restart the autofs service with

service autofs restart