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== Renderingsprofilens parametre - Hvordan man læser dem ==
== Renderingsprofilens parametre - Hvordan man læser dem ==
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[[File:Custom render profiles.png|300px]]
[[File:Custom render profiles.png|300px]]

Revision as of 14:28, 25 February 2013

Renderingsprofilens parametre - Hvordan man læser dem

De parametre, som bruges i renderingsprofiler kommer fra programmet ffmpeg.

Dette er et gennemarbejdet eksempel som viser, hvordan du kan forstå hvad disse parametre betyder ved hjælp af ffmpegs dokumentation.

I eksemplet ovenfor er parametrene:

f=dvd 
vcodec=mpeg2video 
acodec=mp2  
b=5000k 
maxrate=8000k 
minrate=0 
bufsize=1835008 
mux_packet_s=2048 
mux_rate=10080000 
ab=192k 
ar=48000 
s=720x576 
g=15 
me_range=63 
trellis=1 
profile=dv_pal_wide 
pass=2

Søger du i ffmpegs hjælpesider så ser du at:

et vigtigt tilvalg er

-f fmt            force format

videotilvalgene er:

-vcodec codec     force video codec ('copy' to copy stream)
-pass n           select the pass number (1 or 2)
-b bitrate        set bitrate (in bits/s)
-vb bitrate       set bitrate (in bits/s)
-s size           set frame size (WxH or abbreviation)
-me_range         <int>   E.V.. limit motion vectors range (1023 for DivX player)
-trellis          <int>   E.VA. rate-distortion optimal quantization

lystilvalgene er:

-acodec codec     force audio codec ('copy' to copy stream)
-ab bitrate       set bitrate (in bits/s)
-ar rate          set audio sampling rate (in Hz)

AVCodecContext AVOptions inkluderer:

-b                <int>   E.V.. set bitrate (in bits/s)
-maxrate          <int>   E.V.. set max video bitrate tolerance (in bits/s)
-minrate          <int>   E.V.. set min video bitrate tolerance (in bits/s)
-g                <int>   E.V.. set the group of picture size

Alle tilvalgene i renderingsprofilen er således dokumenteret her i ffmpegs dokumentation.

Se også MLT-dokumentationen på ConsumerAvFormat.