====== ffmpeg ======
===== Letöltés =====
  * [[https://www.ffmpeg.org/download.html]]
  * [[http://ffmpeg.zeranoe.com/builds/]]


===== Paraméterezés =====
  * [[http://askubuntu.com/questions/265176/how-to-convert-a-video-from-mp4-flv-to-mpeg-mpg]]
  * [[https://trac.ffmpeg.org/wiki/Encode/H.264]]

==== Forrás átkódolásának kihagyása (csak másolás) ====
<code bash>
-vcodec copy
-acodec copy
</code>


==== Elforgatás ====
  * [[http://stackoverflow.com/a/9570992/1108919]]

<code bash>
# -vf filter_graph    set video filters
# transpose AVOptions:
#   dir               <int>        ..FV.... set transpose direction (from 0 to 7) (default 0)
#     0 = 90CounterCLockwise and Vertical Flip (default)
#     1 = 90Clockwise
#     2 = 90CounterClockwise
#     3 = 90Clockwise and Vertical Flip

-vf transpose=1
</code>


====  Arányos átméretezés szélesség/magasság megadásával ====
  * [[https://trac.ffmpeg.org/wiki/Scaling%20(resizing)%20with%20ffmpeg]]

<code bash>
-vf scale=1920:-1
-vf scale=-1:1080
</code>


==== Gyors indítás streamelés esetén ====
<code bash>
# -movflags          <flags>      E....... MOV muxer flags (default 0)
#    faststart                    E....... Run a second pass to put the index (moov atom) at the beginning of the file

-movflags +faststart
</code>

==== Minőség profilok ====
  * [[http://en.wikipedia.org/wiki/H.264/MPEG-4_AVC#Levels]]
  * [[https://trac.ffmpeg.org/wiki/Encode/H.264#Compatibility]]

<code bash>
-profile:v high -level:v 4.0
-profile:v high -level:v 4.1
</code>


==== Színtér ====
  * [[http://stackoverflow.com/a/15780960/1108919]]

<code bash>
-pix_fmt yuv420p   # for compatibility with outdated media players.
</code>


===== Példák =====
  * Mezítlábas átkódolás: <code bash>
ffmpeg -i "src.mpg" -vcodec h264 -acodec ac3 -movflags +faststart "dst.mkv"
</code><code bash>
ffmpeg -i "src.mov" -c:v libx264 -c:a ac3 -movflags +faststart "dst.mkv"
</code>
  * Elforgatás és átmérezetés egyszerre: <code bash>
ffmpeg -i "src.mp4" -c:v libx264 -c:a ac3 -vf transpose=1,scale=-1:1080 -movflags +faststart "dst.mkv"
</code>
  * Profil megadása: <code bash>
ffmpeg -i "src.mp4" -c:v libx264 -c:a ac3 -profile:v high -level:v 4.1 -movflags +faststart "dst.mkv"
</code>
  * Ciklusban: <code bash>
for %f in (*.mp4) do ffmpeg -i "%f" -vcodec h264 -acodec ac3 -movflags +faststart "%f.mkv"
</code>


==== Minden hasznos egyben ====
<code bash>
ffmpeg -i "%f" -c:v libx264 -c:a ac3 -profile:v high -level:v 4.1 -pix_fmt yuv420p -movflags +faststart "%f.mkv"
</code>


===== Indító script Windows-hoz =====
''C:\Program Files\ffmpeg\ff-prompt.bat'' <file dos ff-prompt.cmd>
@ECHO OFF
REM FF Prompt 1.1
REM Open a command prompt to run ffmpeg/ffplay/ffprobe
REM Copyright (C) 2013  Kyle Schwarz

TITLE FF Prompt

IF NOT EXIST "C:\Program Files\ffmpeg\bin\ffmpeg.exe" (
  CLS
  ECHO "C:\Program Files\ffmpeg\bin\ffmpeg.exe" could not be found.
  GOTO:error
)

CLS
SET PATH=C:\Program Files\ffmpeg\bin;%PATH%
ffmpeg -version
ECHO.
ECHO For help run: ffmpeg -h
ECHO For formats run: ffmpeg -formats ^| more
ECHO For codecs run: ffmpeg -codecs ^| more
ECHO.
ECHO The bin directory has been added to PATH
ECHO.

IF NOT "%*" == "" (
  CMD /K CD /d "%*"
) ELSE (
  CMD
)
GOTO:EOF

:error
  ECHO.
  PAUSE
  GOTO:EOF
</file>

===== MP3 újra kódolása =====
  * https://trac.ffmpeg.org/wiki/Encode/MP3

<file dos>
@echo off
SET PATH=C:\Program Files\ffmpeg\bin;%PATH%

call :convert "01 foo.mp3"
call :convert "02 bar.mp3"
goto :eof

:convert
del "x\%~1"
ffmpeg -i "%~1" -acodec mp3 -aq 2 "x\%~1"
goto :eof
</file>