Ciro Santilli @cirosantilli  40

Shift + R: cut tracks at current point. You can then select fragments to move around or delete.
Shift mouse click drag: select multiple clips: video.stackexchange.com/questions/21598/select-range-of-clips-in-kdenlive

To set the video length, search for "set outpoint" on "monitor".

Add subtitles:

Effects
Dynamic text

then drag on top of the video track. To add only to part of the video, cut it up first.

Preview has no sound on Ubuntu 20.10. Fixed as of Ubuntu 22.04.

Sound worked on Ubuntu 21.04 though, but it then soon crashed with:

 = = SET EFFECT PARAM:  "rect"  =  0=1188 0 732 242
MUTEX LOCK!!!!!!!!!!!! slotactivateeffect:  1
// // // RESULTING REQUIRED SCENE:  1
Object 0x557293592da0 destroyed while one of its QML signal handlers is in progress.
Most likely the object was deleted synchronously (use QObject::deleteLater() instead), or the application is running a nested event loop.
This behavior is NOT supported!
qrc:/qml/EffectToolBar.qml:80: function() { [native code] }
Killed

amazing.

On Ubuntu 22.04 haven't crashed yet.

Ubuntu 23.04 broke the clip drag and drop!

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ShotCut Updated 2025-07-16

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Worked on Ubuntu 20.10.

The UI is a bit too buggy to bear.

How to unsplit, can't find on shotcut 21.05.01: forum.shotcut.org/t/is-it-possible-to-unsplit/1466/2

Background noise reduction: couldn't easily find out how, especially with automatic profile detected based on a selected region as mentioned at audacity profile-based background noise removal:

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OpenShot Updated 2025-07-16

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Ubuntu 20.10 crash...:

  exceptions:ERROR Unhandled Exception
Traceback (most recent call last):
  File "/usr/bin/openshot-qt", line 11, in <module>
    load_entry_point('openshot-qt==2.5.1', 'gui_scripts', 'openshot-qt')()
  File "/usr/lib/python3/dist-packages/openshot_qt/launch.py", line 97, in main
    app = OpenShotApp(argv)
  File "/usr/lib/python3/dist-packages/openshot_qt/classes/app.py", line 218, in __init__
    from windows.main_window import MainWindow
  File "/usr/lib/python3/dist-packages/openshot_qt/windows/main_window.py", line 45, in <module>
    from windows.views.timeline_webview import TimelineWebView
  File "/usr/lib/python3/dist-packages/openshot_qt/windows/views/timeline_webview.py", line 42, in <module>
    from PyQt5.QtWebKitWidgets import QWebView
ImportError: /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5: undefined symbol: _ZN4QRhi10newSamplerEN11QRhiSampler6FilterES1_S1_NS0_11AddressModeES2_, version Qt_5_PRIVATE_API

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Codec acceleration Updated 2025-07-16

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GHDL Updated 2025-07-16

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github.com/ghdl/ghdl

Examples under vhdl.

First install GHDL. On Ubuntu:

sudo apt install verilator

Tested on Verilator 1.0.0, Ubuntu 22.04.

Run all examples, which have assertions in them:

cd vhdl
./run

Files:

Examples
- Basic
  - vhdl/hello_world_tb.vhdl: hello world
  - vhdl/min_tb.vhdl: min
  - vhdl/assert_tb.vhdl: assert
- Lexer
  - vhdl/comments_tb.vhdl: comments
  - vhdl/case_insensitive_tb.vhdl: case insensitive
  - vhdl/whitespace_tb.vhdl: whitespace
  - vhdl/literals_tb.vhdl: literals
- Flow control
  - vhdl/procedure_tb.vhdl: procedure
  - vhdl/function_tb.vhdl: function
- vhdl/operators_tb.vhdl: operators
- Types
  - vhdl/integer_types_tb.vhdl: integer types
  - vhdl/array_tb.vhdl: array
  - vhdl/record_tb.vhdl.bak: record. TODO fails with "GHDL Bug occurred" on GHDL 1.0.0
  - vhdl/generic_tb.vhdl: generic
- vhdl/package_test_tb.vhdl: Packages
  - vhdl/standard_package_tb.vhdl: standard package
  - textio
    * vhdl/write_tb.vhdl: write
    * vhdl/read_tb.vhdl: read
  - vhdl/std_logic_tb.vhdl: std_logic
- vhdl/stop_delta_tb.vhdl: --stop-delta
Applications
- Combinatoric
  - vhdl/adder.vhdl: adder
  - vhdl/sqrt8_tb.vhdl: sqrt8
- Sequential
  - vhdl/clock_tb.vhdl: clock
  - vhdl/counter.vhdl: counter
Helpers
* vhdl/template_tb.vhdl: template

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The Man From Earth (2007) Updated 2025-07-16

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Low budget.

Good theory of Jesus.

List of similar feeling films: www.youtube.com/watch?v=zwYwFoanrNg 11 Underrated Hard Sci-fi Movies by Marvelous Videos (2021)

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The best films of all time Updated 2025-07-16

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There is only a very fine difference between a very good film, and the best films of all time. Perhaps it is something to do on how epic the subject matter is? It is often very hard to tell, and switches between the categories are also possible.

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2019 redefinition of the SI base units Updated 2025-07-16

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web.archive.org/web/20181119214326/https://www.bipm.org/utils/common/pdf/CGPM-2018/26th-CGPM-Resolutions.pdf gives it in raw:

the unperturbed ground state hyperfine transition frequency of the caesium-133 atom $Δ v_{C s}$ is 9 192 631 770 Hz
the speed of light in vacuum c is 299 792 458 m/s
the Planck constant h is 6.626 070 15 × $1 0^{- 34}$ J s
the elementary charge e is 1.602 176 634 × $1 0^{- 19}$ C
the Boltzmann constant k is 1.380 649 × $1 0^{- 23}$ J/K
the Avogadro constant NA is 6.022 140 76 × $1 0^{23}$ mol
the luminous efficacy of monochromatic radiation of frequency 540 × 1012 Hz, Kcd, is 683 lm/W,

The breakdown is:

actually use some physical constant:
- the unperturbed ground state hyperfine transition frequency of the caesium-133 atom $Δ v_{C s}$ is 9 192 631 770 Hz
  Defines the second in terms of caesium-133 experiments. The beauty of this definition is that we only have to count an integer number of discrete events, which is what allows us to make things precise.
- the speed of light in vacuum c is 299 792 458 m/s
  Defines the meter in terms of speed of light experiments. We already had the second from the previous definition.
- the Planck constant h is 6.626 070 15 × $1 0^{- 34}$ J s
  Defines the kilogram in terms of the Planck constant.
- the elementary charge e is 1.602 176 634 × $1 0^{- 19}$ C
  Defines the Coulomb in terms of the electron charge.
arbitrary definitions based on the above just to match historical values as well as possible:
- the Boltzmann constant k is 1.380 649 × $1 0^{- 23}$ J/K
  Arbitrarily defines temperature from previously defined energy (J) to match historical values.
- the Avogadro constant NA is 6.022 140 76 × $1 0^{23}$ mol
  Arbitrarily defines the mol to match historical values. In particular, the kilogram is not an exact multiple of the weight of an atom of hydrogen.
- the luminous efficacy of monochromatic radiation of frequency 540 × 1012 Hz, Kcd, is 683 lm/W
  Arbitrarily defines the Candela in terms of previous values to match historical records. The most useless unit comes last as you'd expect.

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Value change dump Updated 2025-07-16

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