Difference between revisions of "Documentation:Modules/avcodec"

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(Add default options (from source code))
(Replace options help text with help longtext. Is this an improvement? I'm not sure what is preferred by readers of this page)
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== Decoding ==
 
== Decoding ==
 
{{Option|name=avcodec-dr|value=boolean|default=enabled|description=Direct rendering}}
 
{{Option|name=avcodec-dr|value=boolean|default=enabled|description=Direct rendering}}
−
{{Option|name=avcodec-corrupted|value=boolean|default=enabled|description=Show corrupted frames}}
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{{Option|name=avcodec-corrupted|value=boolean|default=enabled|description=Prefer visual artifacts instead of missing frames}}
−
{{Option|name=avcodec-error-resilience|value=integer|default=1|description=Error resilience}}
+
{{Option|name=avcodec-error-resilience|value=integer|min=0|max=4|default=1|description=libavcodec can do error resilience. However, with a buggy encoder (such as the ISO MPEG-4 encoder from M$) this can produce a lot of errors. Valid values range from 0 to 4 (0 disables all errors resilience)}}
−
{{Option|name=avcodec-workaround-bugs|value=integer|default=1|description=Workaround bugs}}
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{{Option|name=avcodec-workaround-bugs|value=integer|default=1|description=Try to fix some bugs: 1  autodetect, 2  old msmpeg4, 4  xvid interlaced, 8  ump4, 16 no padding, 32 ac vlc, 64 Qpel chroma. This must be the sum of the values. For example, to fix "ac vlc" and "ump4", enter 40.)}}
−
{{Option|name=avcodec-hurry-up|value=boolean|default=enabled|description=Hurry up}}
+
{{Option|name=avcodec-hurry-up|value=boolean|default=enabled|description=The decoder can partially decode or skip frame(s) when there is not enough time. It's useful with low CPU power but it can produce distorted pictures}}
−
{{Option|name=avcodec-skip-frame|value=integer|select={-1 (None), 0 (Default), 1 (Non-ref), 2 (Bidir), 3 (Non-key), 4 (All)}|default=0|description=Skip frame}}
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{{Option|name=avcodec-skip-frame|value=integer|select={-1,0,1,2,3,4}|default=0|description=Force skipping of frames to speed up decoding (-1=None, 0=Default, 1=B-frames, 2=P-frames, 3=B+P frames, 4=all frames)}}
−
{{Option|name=avcodec-skip-idct|value=integer|select={-1 (None), 0 (Default), 1 (Non-ref), 2 (Bidir), 3 (Non-key), 4 (All)}|default=0|description=Skip [[IDCT]]}}
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{{Option|name=avcodec-skip-idct|value=integer|select={-1,0,1,2,3,4}|default=0|description=Force skipping of [[IDCT]] to speed up decoding for frame types (-1=None, 0=Default, 1=B-frames, 2=P-frames, 3=B+P frames, 4=all frames)}}
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{{Option|name=avcodec-fast|value=boolean|default=disabled|description=Allow speed tricks}}
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{{Option|name=avcodec-fast|value=boolean|default=disabled|description=Allow non specification compliant speedup tricks. Faster but error-prone}}
−
{{Option|name=avcodec-skiploopfilter|value=integer|select={0 (None), 1 (Non-ref), 2 (Bidir), 3 (Non-key), 4 (All)}|default=0|description=Skip the loop filter for H.264 decoding)}}
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{{Option|name=avcodec-skiploopfilter|value=integer|select={0 (None), 1 (Non-ref), 2 (Bidir), 3 (Non-key), 4 (All)}|default=0|description=Skipping the loop filter (aka deblocking) usually has a detrimental effect on quality. However it provides a big speedup for high definition streams}}
−
{{Option|name=avcodec-debug|value=integer|default=0|description=Debug mask}}
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{{Option|name=avcodec-debug|value=integer|default=0|description=Set FFmpeg debug mask}}
−
{{Option|name=avcodec-codec|value=string|default=NULL|description=Codec name}}
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{{Option|name=avcodec-codec|value=string|default=NULL|description=Internal libavcodec codec name}}
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{{Option|name=avcodec-hw|value=integer|select={any,vdpau_avcodec,vaapi,vaapi_drm,none}|default=any|description=Hardware decoding}}
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{{Option|name=avcodec-hw|value=integer|select={any,vdpau_avcodec,vaapi,vaapi_drm,none}|default=any|description=This allows hardware decoding when available}}
−
{{Option|name=avcodec-threads|value=integer|default=0|description=Threads}}
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{{Option|name=avcodec-threads|value=integer|default=0|description=Number of threads used for decoding, 0 meaning auto}}
−
{{Option|name=avcodec-options|value=string|default=NULL|description=Advanced options}}
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{{Option|name=avcodec-options|value=string|default=NULL|description=Advanced options, in the form <code>{opt=val,opt2=val2}</code>}}
  
 
== Encoding ==
 
== Encoding ==

Revision as of 00:15, 30 March 2019

See also: Documentation:Modules/avformat
Module: avcodec
Type codec library
First VLC version -
Last VLC version -
Operating system(s) all
Description Various audio and video decoders/encoders delivered by the FFmpeg library. This includes (MS)MPEG4, DivX, SVQ1, H261, H263, H264, WMV, WMA, AAC, AMR, DV, MJPEG and other codecs
Shortcut(s) -

libavcodec provided by the FFmpeg project. A full list of supported codecs may be found with modules/codec/avcodec/fourcc.c

Options prefixed with ffmpeg- or sout-ffmpeg- were deprecated in 2.1.0 to reflect the new module name avcodec. The only option that seems not to have been replaced later is --avcodec-vismv, removed in 3.0.0.

Options as of 3.0.6:

Decoding

  • avcodec-dr <boolean> : Direct rendering default value: enabled
  • avcodec-corrupted <boolean> : Prefer visual artifacts instead of missing frames default value: enabled
  • avcodec-error-resilience <integer [0 .. 4]> : libavcodec can do error resilience. However, with a buggy encoder (such as the ISO MPEG-4 encoder from M$) this can produce a lot of errors. Valid values range from 0 to 4 (0 disables all errors resilience) default value: 1
  • avcodec-workaround-bugs <integer> : Try to fix some bugs: 1 autodetect, 2 old msmpeg4, 4 xvid interlaced, 8 ump4, 16 no padding, 32 ac vlc, 64 Qpel chroma. This must be the sum of the values. For example, to fix "ac vlc" and "ump4", enter 40.) default value: 1
  • avcodec-hurry-up <boolean> : The decoder can partially decode or skip frame(s) when there is not enough time. It's useful with low CPU power but it can produce distorted pictures default value: enabled
  • avcodec-skip-frame <integer> {-1,0,1,2,3,4} : Force skipping of frames to speed up decoding (-1=None, 0=Default, 1=B-frames, 2=P-frames, 3=B+P frames, 4=all frames) default value: 0
  • avcodec-skip-idct <integer> {-1,0,1,2,3,4} : Force skipping of IDCT to speed up decoding for frame types (-1=None, 0=Default, 1=B-frames, 2=P-frames, 3=B+P frames, 4=all frames) default value: 0
  • avcodec-fast <boolean> : Allow non specification compliant speedup tricks. Faster but error-prone default value: disabled
  • avcodec-skiploopfilter <integer> {0 (None), 1 (Non-ref), 2 (Bidir), 3 (Non-key), 4 (All)} : Skipping the loop filter (aka deblocking) usually has a detrimental effect on quality. However it provides a big speedup for high definition streams default value: 0
  • avcodec-debug <integer> : Set FFmpeg debug mask default value: 0
  • avcodec-codec <string> : Internal libavcodec codec name default value: NULL
  • avcodec-hw <integer> {any,vdpau_avcodec,vaapi,vaapi_drm,none} : This allows hardware decoding when available default value: any
  • avcodec-threads <integer> : Number of threads used for decoding, 0 meaning auto default value: 0
  • avcodec-options <string> : Advanced options, in the form {opt=val,opt2=val2} default value: NULL

Encoding

  • sout-avcodec-codec <string> : Codec name default value: NULL
  • sout-avcodec-hq <string> {rd,bits,simple} : Quality level default value: rd
  • sout-avcodec-keyint <integer> : Ratio of key frames default value: 0
  • sout-avcodec-bframes <integer> : Ratio of B frames default value: 0
  • sout-avcodec-hurry-up <boolean> : Hurry up default value: disabled
  • sout-avcodec-interlace <boolean> : Interlaced encoding default value: disabled
  • sout-avcodec-interlace-me <boolean> : Interlaced motion estimation default value: enabled
  • sout-avcodec-vt <integer> : Video bitrate tolerance default value: 0
  • sout-avcodec-pre-me <boolean> : Pre-motion estimation default value: disabled
  • sout-avcodec-rc-buffer-size <integer> : Rate control buffer size default value: 0
  • sout-avcodec-rc-buffer-aggressivity <float> : Rate control buffer aggressiveness default value: 1.0
  • sout-avcodec-i-quant-factor <float> : I quantization factor default value: 0
  • sout-avcodec-noise-reduction <integer> : Noise reduction default value: 0
  • sout-avcodec-mpeg4-matrix <boolean> : MPEG4 quantization matrix default value: disabled
  • sout-avcodec-qmin <integer> : Minimum video quantizer scale default value: 0
  • sout-avcodec-qmax <integer> : Maximum video quantizer scale default value: 0
  • sout-avcodec-trellis <boolean> : Trellis quantization default value: disabled
  • sout-avcodec-qscale <float> : Fixed quantizer scale default value: 3
  • sout-avcodec-strict <integer [-2 .. 2]> : Strict standard compliance default value: 0
  • sout-avcodec-lumi-masking <float> : Luminance masking default value: 0.0
  • sout-avcodec-dark-masking <float> : Darkness masking default value: 0.0
  • sout-avcodec-p-masking <float> : Motion masking default value: 0.0
  • sout-avcodec-border-masking <float> : Border masking default value: 0.0
  • sout-avcodec-luma-elim-threshold <integer> : Luminance elimination default value: 0
  • sout-avcodec-chroma-elim-threshold <integer> : Chrominance elimination default value: 0
  • sout-avcodec-aac-profile <string> : Specify AAC audio profile to use default value: low
  • sout-avcodec-options <string> : Advanced options default value: NULL

Source code

This page is part of official VLC media player Documentation (User Guide • Streaming HowTo • Hacker Guide • Modules)
Please read the Documentation Editing Guidelines before you edit the documentation
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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