hello friends! new(ish)!
WebM: Difference between revisions
>Hevnoraak m (Added another .bat) |
>Hevnoraak m (I have no idea how to format this shit) |
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'''Heftier video to .webm''' | '''Heftier video to .webm''' | ||
@echo off | @echo off | ||
rem 3megabyte in bit | rem 3megabyte in bit | ||
set MAXSIZE=25165824 | set MAXSIZE=25165824 | ||
set WIDTH=720 | set WIDTH=720 | ||
ffmpeg -i %1 2> webm.tmp | ffmpeg -i %1 2> webm.tmp | ||
for /F "tokens=1,2,3,4,5,6 delims=:., " %%i in (webm.tmp) do ( | for /F "tokens=1,2,3,4,5,6 delims=:., " %%i in (webm.tmp) do ( | ||
if "%%i"=="Duration" call :calcLength %%j %%k %%l %%m | if "%%i"=="Duration" call :calcLength %%j %%k %%l %%m | ||
) | ) | ||
del webm.tmp | del webm.tmp | ||
SET /a BITRATE=%MAXSIZE%/%VSECONDS% | SET /a BITRATE=%MAXSIZE%/%VSECONDS% | ||
ffmpeg -y -i %1 -an -vf scale=-1:%WIDTH% -c:v libvpx -crf 5 -qmin 0 -qmax 50 -b:v %BITRATE% -f webm -pass 1 NUL | ffmpeg -y -i %1 -an -vf scale=-1:%WIDTH% -c:v libvpx -crf 5 -qmin 0 -qmax 50 -b:v %BITRATE% -f webm -pass 1 NUL | ||
ffmpeg -y -i %1 -an -vf scale=-1:%WIDTH% -c:v libvpx -crf 5 -qmin 0 -qmax 50 -b:v %BITRATE% -f webm -pass 2 "%~n1.webm" | ffmpeg -y -i %1 -an -vf scale=-1:%WIDTH% -c:v libvpx -crf 5 -qmin 0 -qmax 50 -b:v %BITRATE% -f webm -pass 2 "%~n1.webm" | ||
del ffmpeg2pass-0.log > NUL | del ffmpeg2pass-0.log > NUL | ||
goto :EOF | goto :EOF | ||
Revision as of 17:25, 5 April 2014
WebM support is (hopefully) the newest addition to 4chan. This wiki page is meant to serve as an instructional tool to help you get started converting your content to WebM for posting.
WebM {is being, was} tested in these threads:
- https://rbt.asia/g/thread/S41184007
- https://rbt.asia/g/thread/S41183707
- https://rbt.asia/g/thread/S41178861
- https://rbt.asia/g/thread/S41190521
... and on a few /jp/ threads.
Converting with ffmpeg
Note: avconv and ffmpeg are not entirely drop-in replacements. Make sure you know which one you are using.
Linux and OS X Scripts
If you're using OS X or Linux, you probably know how to save and execute these scripts already, but here's a quick overview:
- Create a file, such as
~/bin/my_script.sh - Copy and paste the code into this file with your favorite editor.
- Open a shell. Run the command
chmod +x ~/bin/my_script.sh - The script can now be called as
~/bin/my_script.sh some_file.typeor if you have your PATH set correctly,my_script.sh some_file.type
Basic .gif to .webm
#!/bin/bash
out=${1%%.gif}.webm
ffmpeg -i $1 -c:v libvpx -crf 32 -b:v 300K $out
Basic video to .webm
#!/bin/bash ffmpeg -i $1 -c:v libvpx -an $1.webm
Windows
After installing ffmpeg/avconv, most of these commands can be saved as .bat files and placed in the folder of the media file you wish to work with. Or you can just run them from the command prompt, assuming you have your PATH set correctly.
Basic .gif to .webm
Basic video to .webm
ffmpeg.exe -i "C:\Users\Anon\Input_File.mkv" -ss 30 -t 15 -codec:v vp8 -an "C:\Users\Anon\Output_File.webm"
Heftier video to .webm
@echo off
rem 3megabyte in bit
set MAXSIZE=25165824
set WIDTH=720
ffmpeg -i %1 2> webm.tmp
for /F "tokens=1,2,3,4,5,6 delims=:., " %%i in (webm.tmp) do (
if "%%i"=="Duration" call :calcLength %%j %%k %%l %%m
)
del webm.tmp
SET /a BITRATE=%MAXSIZE%/%VSECONDS%
ffmpeg -y -i %1 -an -vf scale=-1:%WIDTH% -c:v libvpx -crf 5 -qmin 0 -qmax 50 -b:v %BITRATE% -f webm -pass 1 NUL
ffmpeg -y -i %1 -an -vf scale=-1:%WIDTH% -c:v libvpx -crf 5 -qmin 0 -qmax 50 -b:v %BITRATE% -f webm -pass 2 "%~n1.webm"
del ffmpeg2pass-0.log > NUL
goto :EOF
Other WebM Creation
Please see Reccomended_software for a list of good software for handling video files such as WebM.