User Guide
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Version 1.2.7 Alpha (2018-07-12)
Axiom
An FFmpeg Interface for Windows
Axiom
Axiom UI generates command scripts to be interpreted and processed by multimedia encoder,
FFmpeg, and streams analyzer, FFprobe.
Convert, Cut, Resize multimedia with Lossless, Constant, and Variable Quality Modes.
It is portable and can be run from any location on the computer.
• Extract Axiom.FFmpeg.7z to a location of your choice.
• Use 7-Zip if you need a way to extract. https://www.7-zip.org
• Run the program Axiom.exe or create a shortcut on the Desktop.
• It will automatically detect ffmpeg.exe and ffprobe.exe in the included ffmpeg folder.
• If you move the ffmpeg folder, set Windows Environment Variables or choose path in
the Settings Tab.
FFmpeg
FFmpeg is separate cross-platform command-line software to record, convert and stream audio and
video. It is developed and maintained at www.ffmpeg.org.
Enable FFmpeg Through Command Prompt (optional)
• Move FFmpeg folder to a location of your choice, such as C:\Program Files\.
• Control Panel → System and Security → System → Advanced system settings
• Advanced Tab → Environment Variables → System variables → Path
• Add C:\Program Files\FFmpeg\bin\
• Separate multiple paths with semicolon ;
• Typing ffmpeg in Command Prompt will now execute without needing to specify a direct path.
Interface
FFmpeg Command Script
File to convert
Update
Log Console
Keep Command Prompt
window open after converting
has finished
Open this path’s location in
Windows Explorer
Generate FFmpeg Command-line
Script without Converting
Input File Properties
Output Format
Preview selected settings
in FFplay
Batch convert all files within a
folder. Enter the extension of the
files you want to process
(eg. .mp4)
Windows
Crop
Set the Crop Position and Aspect.
X is the position from the left.
Y is the position from the top.
Width & Height is the size of the
cropped area.
Log Console
This window displays all actions performed
by the program. These same actions can be
saved to an output.log file in the Settings Tab.
FFmpeg
This Command Prompt window
pops up after pressing the
Convert or Run button.
It displays the FFmpeg output as
it processes the files.
Interface Settings
FFmpeg
The interface looks for ffmpeg.exe & ffprobe.exe in {Current Folder}\ffmpeg\bin\.
If you already have FFmpeg installed on your system, the FFmpeg and FFprobe included with Axiom are not needed.
Custom compiled versions of FFmpeg may not work if they are missing certain codecs.
Browse / Output
Select a file to convert, then choose a directory to output.
If you leave Output empty, the output directory will default to the same as the input directory.
Batch
First click the Batch toggle button, then Browse for a folder to batch process the files within.
Auto
Attempts to match the original bit-rate using FFprobe and 2-Pass encoding.
Copy
If Auto mode selected and input/output formats are the same, Copy will automatically activate in the Codec dropdown.
Lossless
Sets the format’s correct lossless codec options or uses -crf 0, depending on format.
Video
Custom CRF Quality:
0 <------ 18 <--------- 23 -------> 28 -------> 51
lossless better default
worse
worst
VP8/VP9:
Ultra: Bit-rate 4M + CRF 10
High: Bit-rate 2M + CRF 12
Med: Bit-rate 1.3M + CRF 16
Low: Bit-rate 600K + CRF 20
Sub: Bit-rate 250K + CRF 25
x264:
Ultra:
High:
Med:
Low:
Sub:
CRF 16
CRF 20
CRF 28
CRF 37
CRF 45
x265:
Ultra:
High:
Med:
Low:
Sub:
CRF 18
CRF 21
CRF 26
CRF 35
CRF 42
Theora:
Ultra: qscale 10
High: qscale 8
Med: qscale 6
Low: qscale 4
Sub: qscale 2
Video Bit-rate is measured in bytes, K or M. (e.g 3000000 or 3000K or 3M)
Audio
Default is Constant Bit-rate (CBR).
VBR enables a Variable Bit-rate equivalent to the CBR value selected in the Audio drop down list.
e.g. MP3: 320k (CBR) = V0 (VBR)
Track
If your video has multiple audio tracks, such as English or Japanese, you can select which one to use or keep all.
View the video properties through a media player to find the number of the track.
The default (auto) chooses the appropriate tracks according to the output format.
Resize
Specify a custom Width and Height.
Typing “auto” (without quotes) in a text field will select the correct width or height to match.
Cut
Format must be 00:00:00.000
Hours:Minutes:Seconds.milliseconds (note the period instead of colon).
FFmpeg Command-line
ffmpeg -y -i “C:\Users\Axiom\video.mp4” -c:v libvpx -quality good -cpu-used 0 -b:v 2M -crf 12
-pix_fmt yuv420p -r 30 -vf “scale=-1:1080” -movflags faststart -map 0:v:0? -map_chapters -1 -sn
-c:a libvorbis -q:a 9 -map 0:a:0? -ss 00:08:32.000 -to 00:10:26.500 -map_metadata 0 -f webm
-threads 0 “C:\Users\Axiom\video.webm”
FFmpeg Batch Command-line
Change to Directory
cd “C:\Users\Videos\”
Batch Process Filetype
&& for %f in (*.mp4) do (echo)
FFprobe File’s Size
& for /F “delims=” %S in (‘@ffprobe -v error -select_streams v:0 -show_entries format^=size -of default^=noprint_
wrappers^=1:nokey^=1 “%~f” 2^>^&1’) do (SET size=%S)
Set %S to %size%
& for /F %S in (‘echo %size%’) do (echo)
FFprobe File’s Duration
& for /F “delims=” %D in (‘@ffprobe -v error -select_streams v:0 -show_entries format^=duration -of default^=noprint_
wrappers^=1:nokey^=1 “%~f” 2^>^&1’) do (SET duration=%D)
Remove Duration Decimals for DOS
& for /F “tokens=1 delims=.” %R in (‘echo %duration%’) do (SET duration=%R)
Set %D to %duration%
& for /F %D in (‘echo %duration%’) do (echo)
FFprobe File’s Video Bit-rate
& for /F “delims=” %V in (‘@ffprobe -v error -select_streams v:0 -show_entries stream^=bit_rate -of default^=noprint_
wrappers^=1:nokey^=1 “%~f” 2^>^&1’) do (SET vBitrate=%V)
Set %V to %vBitrate%
& for /F %V in (‘echo %vBitrate%’) do (echo)
If %vBitrate% = N/A, Calculate Bit-rate (((Size*8)/1000)/Duration)*1000
& (if %V EQU N/A (SET /a vBitrate=%S*8/1000/%D*1000) ELSE (echo Video Bitrate Detected))
Set %V to %vBitrate%
& for /F %V in (‘echo %vBitrate%’) do (echo)
FFprobe File’s Audio Bit-rate
& for /F “delims=” %A in (‘@ffprobe -v error -select_streams a:0 -show_entries stream=bit_rate -of default^=noprint_
wrappers^=1:nokey^=1 “%~f” 2^>^&1’) do (SET aBitrate=%A)
If Audio Variable = N/A, Default to 320k
& for /F %A in (‘echo %aBitrate%’) do (echo) & (IF %A EQU N/A (SET aBitrate=320000))
Limit Audio Variable bit-rate to Output Format’s maximum allowed bit-rate
& for /F %A in (‘echo %aBitrate%’) do (echo) & (IF %A gtr 500000 (SET aBitrate=500000) ELSE (echo Bitrate within Vorbis Limit
of 500k))
Set %A to %aBitrate%
& for /F %A in (‘echo %aBitrate%’) do (echo)
Start FFmpeg
&& ffmpeg -y -i “C:\Users\Videos\%~f” -vcodec libvpx -quality good -cpu-used 0 -b:v %V -pass 1
-acodec libvorbis -b:a %A -map 0:v:0? -map 0:a:0? -sn -map_metadata 0 -threads 8 “C:\Users\Videos\%~nf.webm”
2-Pass Encoding
&& ffmpeg -y -i “C:\Users\Videos\%~f” -vcodec libvpx -quality good -cpu-used 0 -b:v %V -pass 2
-acodec libvorbis -b:a %A -map 0:v:0? -map 0:a:0? -sn -map_metadata 0 -threads 8 “C:\Users\Videos\%~nf.webm”
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