Difference between revisions of "Documentation:Modules/avcodec"
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(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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{{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-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=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-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={-1,0,1,2,3,4}|default=0|description=Force skipping of | + | {{Option|name=avcodec-skip-frame|value=integer|select={-1,0,1,2,3,4}|default=0|description=Force skipping of [[frame]]s to speed up decoding (-1=None, 0=Default, 1=[[B-frame]]s, 2=[[P-frame]]s, 3=B+P frames, 4=all frames)}} |
{{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)}} | {{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)}} | ||
{{Option|name=avcodec-fast|value=boolean|default=disabled|description=Allow non specification compliant speedup tricks. Faster but error-prone}} | {{Option|name=avcodec-fast|value=boolean|default=disabled|description=Allow non specification compliant speedup tricks. Faster but error-prone}} | ||
| Line 25: | Line 25: | ||
== Encoding == | == Encoding == | ||
| − | {{Option|name=sout-avcodec-codec|value=string|default=NULL|description=Codec name}} | + | {{Option|name=sout-avcodec-codec|value=string|default=NULL|description=[[Codec]] name}} |
{{Option|name=sout-avcodec-hq|value=string|select={rd,bits,simple}|default=rd|description=Quality level}} | {{Option|name=sout-avcodec-hq|value=string|select={rd,bits,simple}|default=rd|description=Quality level}} | ||
{{Option|name=sout-avcodec-keyint|value=integer|default=0|description=Ratio of key frames}} | {{Option|name=sout-avcodec-keyint|value=integer|default=0|description=Ratio of key frames}} | ||
{{Option|name=sout-avcodec-bframes|value=integer|default=0|description=Ratio of B frames}} | {{Option|name=sout-avcodec-bframes|value=integer|default=0|description=Ratio of B frames}} | ||
{{Option|name=sout-avcodec-hurry-up|value=boolean|default=disabled|description=Hurry up}} | {{Option|name=sout-avcodec-hurry-up|value=boolean|default=disabled|description=Hurry up}} | ||
| − | {{Option|name=sout-avcodec-interlace|value=boolean|default=disabled|description=Interlaced encoding}} | + | {{Option|name=sout-avcodec-interlace|value=boolean|default=disabled|description=[[Interlaced]] encoding}} |
{{Option|name=sout-avcodec-interlace-me|value=boolean|default=enabled|description=Interlaced motion estimation}} | {{Option|name=sout-avcodec-interlace-me|value=boolean|default=enabled|description=Interlaced motion estimation}} | ||
| − | {{Option|name=sout-avcodec-vt|value=integer|default=0|description=Video bitrate tolerance}} | + | {{Option|name=sout-avcodec-vt|value=integer|default=0|description=Video [[bitrate]] tolerance}} |
{{Option|name=sout-avcodec-pre-me|value=boolean|default=disabled|description=Pre-motion estimation}} | {{Option|name=sout-avcodec-pre-me|value=boolean|default=disabled|description=Pre-motion estimation}} | ||
{{Option|name=sout-avcodec-rc-buffer-size|value=integer|default=0|description=Rate control buffer size}} | {{Option|name=sout-avcodec-rc-buffer-size|value=integer|default=0|description=Rate control buffer size}} | ||
| Line 38: | Line 38: | ||
{{Option|name=sout-avcodec-i-quant-factor|value=float|default=0|description=I quantization factor}} | {{Option|name=sout-avcodec-i-quant-factor|value=float|default=0|description=I quantization factor}} | ||
{{Option|name=sout-avcodec-noise-reduction|value=integer|default=0|description=Noise reduction}} | {{Option|name=sout-avcodec-noise-reduction|value=integer|default=0|description=Noise reduction}} | ||
| − | {{Option|name=sout-avcodec-mpeg4-matrix|value=boolean|default=disabled|description= | + | {{Option|name=sout-avcodec-mpeg4-matrix|value=boolean|default=disabled|description=[[MPEG-4]] quantization matrix}} |
{{Option|name=sout-avcodec-qmin|value=integer|default=0|description=Minimum video quantizer scale}} | {{Option|name=sout-avcodec-qmin|value=integer|default=0|description=Minimum video quantizer scale}} | ||
{{Option|name=sout-avcodec-qmax|value=integer|default=0|description=Maximum video quantizer scale}} | {{Option|name=sout-avcodec-qmax|value=integer|default=0|description=Maximum video quantizer scale}} | ||
| Line 50: | Line 50: | ||
{{Option|name=sout-avcodec-luma-elim-threshold|value=integer|default=0|description=Luminance elimination}} | {{Option|name=sout-avcodec-luma-elim-threshold|value=integer|default=0|description=Luminance elimination}} | ||
{{Option|name=sout-avcodec-chroma-elim-threshold|value=integer|default=0|description=Chrominance elimination}} | {{Option|name=sout-avcodec-chroma-elim-threshold|value=integer|default=0|description=Chrominance elimination}} | ||
| − | {{Option|name=sout-avcodec-aac-profile|value=string|default=low|description=Specify AAC audio profile to use}} | + | {{Option|name=sout-avcodec-aac-profile|value=string|default=low|description=Specify [[AAC]] audio profile to use}} |
{{Option|name=sout-avcodec-options|value=string|default=NULL|description=Advanced options}} | {{Option|name=sout-avcodec-options|value=string|default=NULL|description=Advanced options}} | ||
Revision as of 07:31, 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> : MPEG-4 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
- (folder)
- modules/codec/avcodec/avcodec.c (main file)
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
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.
