Kdenlive/Manual/Projektmenuen/Rendering/Renderingsprofilens parametre
Render Profile Parameters - How to read them
Render Profile Parameters - How to read them - ver 0.9.10
In version 0.9.10 the render profile parameters changed significantly.
Kdenlive now makes use of "property presets" delivered by the melt project (see melt doco). These presets are referenced by the properties=<preset> syntax. In the example illustrated, the render profile is referencing lossless/H.264. This refers to a property preset found in file H.264 found on the system at /usr/share/mlt/presets/consumer/avformat/lossless.
All the <presets> referenced in the render settings in Kdenlive will be referring to presets found at /usr/share/mlt/presets/consumer/avformat/ (on a default install). Note that you reference presets found in subdirectories of this folder using a <dirname>/<profile> syntax as shown in the example above.
properties=lossless/H.264 g=120 crf=%quality ab=%audiobitrate+'k'
The preset files found at /usr/share/mlt/presets/consumer/avformat/ are simple text files that contain the melt parameters that define the rendering. An example is shown below. These are the same parameters that were used in earlier versions of Kdenlive — see next section for how to read those.
Contents of lossless/H.264:
f=mp4 acodec=aac ab=384k vcodec=libx264 intra=1 vb=0 g=0 bf=0 preset=medium qscale=1 qp=0 coder=ac meta.preset.extension=mp4 meta.preset.note=Intra-frame only, lossless compressed MPEG-4 AVC with AAC audio
Renderingsprofilens parametre - Hvordan man læser dem - tidligere versioner af Kdenlive
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 disse parametre oversættes som vist herunder:
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.