文章目录前言1.环境检查1.1检查lux安装1.2检查FFmpeg安装1.3备注2.lux指令2.1无OPTIONS2.2-i指令2.3-f指令2.4-c指令2.5-o指令2.6备注3.结语前言在学习之余，发现了一个简单并且高效的视频下载器lux,能够帮你快速且高效的下载文件（不仅仅是视频可以），

#NativecompilationonARM/ARM64host#BuildMPPmkdir-p~/dev&&cd~/devgitclone-bjellyfin-mpp--depth=1https://github.com/nyanmisaka/mpp.gitrkmpppushdrkmppmkdirrkmpp_buildpushdrkmpp_buildcmake\-DCMAKE_INSTALL_PREFIX=/usr

前言在多媒体处理领域，FFmpeg无疑是一个不可或缺的利器。它功能强大且高度灵活，能够轻松应对各种音频和视频处理任务，无论是简单的格式转换，还是复杂的音频编辑，都不在话下。然而，要想真正发挥FFmpeg的潜力，我还需深入学习其高级用法和最佳实践。通过这些技巧，我将能更高效地处理多媒

一、视频编码流程使用ffmpeg解码视频帧主要可分为两大步骤：初始化编码器和编码视频帧，以下代码以h264为例1.初始化编码器初始化编码器包含以下步骤：（1）查找编码器videoCodec=avcodec_find_encoder_by_name(videoCodecName);if(!videoCodec){release();retur

Applycrossfadefromoneinputaudiostreamtoanotherinputaudiostream.Thecrossfadeisappliedforspecifieddurationneartheendoffirststream.Thefilteracceptsthefollowingoptions:nb_samples,nsSpecifythenumberofsamplesforwhichthe

Splitaudiostreamintoseveralbands.Thisfiltersplitsaudiostreamintotwoormorefrequencyranges.Summingallstreamsbackwillgiveflatoutput.Thefilteracceptsthefollowingoptions:splitSetsplitfrequencies.Thosemustbepositiveandincr

Splitaudiostreamintoseveralbands.Thisfiltersplitsaudiostreamintotwoormorefrequencyranges.Summingallstreamsbackwillgiveflatoutput.Thefilteracceptsthefollowingoptions:splitSetsplitfrequencies.Thosemustbepositiveandincr

Reduceaudiobitresolution.Thisfilterisbitcrusherwithenhancedfunctionality.Abitcrusherisusedtoaudiblyreducenumberofbitsanaudiosignalissampledwith.Thisdoesn’tchangethebitdepthatall,itjustproducestheeffect.Materialre

Removeimpulsivenoisefrominputaudio.Samplesdetectedasimpulsivenoisearereplacedbyinterpolatedsamplesusingautoregressivemodelling.window,wSetwindowsize,inmilliseconds.Allowedrangeisfrom10to100.Defaultvalueis55milliseconds.

Removeclippedsamplesfrominputaudio.Samplesdetectedasclippedarereplacedbyinterpolatedsamplesusingautoregressivemodelling.window,wSetwindowsize,inmilliseconds.Allowedrangeisfrom10to100.Defaultvalueis55milliseconds.Thisse

Delayoneormoreaudiochannels.Samplesindelayedchannelarefilledwithsilence.Thefilteracceptsthefollowingoption:delaysSetlistofdelaysinmillisecondsforeachchannelseparatedby’|’.Unuseddelayswillbesilentlyignored.Ifnumberof

FilteringinFFmpegisenabledthroughthelibavfilterlibrary.Inlibavfilter,afiltercanhavemultipleinputsandmultipleoutputs.Toillustratethesortsofthingsthatarepossible,weconsiderthefollowingfiltergraph.[main]input-->split-

Thegraph2dotprogramincludedintheFFmpegtoolsdirectorycanbeusedtoparseafiltergraphdescriptionandissueacorrespondingtextualrepresentationinthedotlanguage.Invokethecommand:graph2dot-htoseehowtousegraph2dot.Youcanthenpas

Afiltergraphisadirectedgraphofconnectedfilters.Itcancontaincycles,andtherecanbemultiplelinksbetweenapairoffilters.Eachlinkhasoneinputpadononesideconnectingittoonefilterfromwhichittakesitsinput,andoneoutputpad

Somefilterssupportagenericenableoption.Forthefilterssupportingtimelineediting,thisoptioncanbesettoanexpressionwhichisevaluatedbeforesendingaframetothefilter.Iftheevaluationisnon-zero,thefilterwillbeenabled,otherwis

EverylibraryinFFmpegprovidesasetofpublicAPIsinitsinstalledheaders,whicharethoselistedinthevariableHEADERSinthatlibrary’sMakefile.Allidentifiersdefinedinthoseheaders(exceptforthoseexplicitlydocumentedotherwise),andcor

nynewpublicidentifiersininstalledheadersareconsiderednewAPI-thisincludesnewfunctions,structs,macros,enumvalues,typedefs,newfieldsinexistingstructs,newinstalledheaders,etc.ConsiderthefollowingguidelineswhenaddingnewAPIs

Duetoabovementionedcompatibilityguarantees,removingAPIsisaninvolvedprocessthatshouldonlybeundertakenwithgoodreason.Typicallyadeficient,restrictive,orotherwiseinadequateAPIisreplacedbyasuperiorone,thoughitdoesattimesha

InordertoconfigureVimtofollowFFmpegformattingconventions,pastethefollowingsnippetintoyour.vimrc:"indentationrulesforFFmpeg:4spaces,notabssetexpandtabsetshiftwidth=4setsofttabstop=4setcindentsetcinoptions=(0"Allowt

UsetheJavaDoc/Doxygenformat(seeexamplesbelow)sothatcodedocumentationcanbegeneratedautomatically.Allnontrivialfunctionsshouldhaveacommentabovethemexplainingwhatthefunctiondoes,evenifitisjustonesentence.Allstructuresand

Namesoffunctions,variables,andstructmembersmustbelowercase,usingunderscores(_)toseparatewords.Forexample,‘avfilter_get_video_buffer’isanacceptablefunctionnameand‘AVFilterGetVideo’isnot.Struct,union,enum,andtypedeffedtypen

CorrectnessThecodemustbevalid.Itmustnotcrash,abort,accessinvalidpointers,leakmemory,causedataracesorsignedintegeroverflow,orotherwisecauseundefinedbehaviour.Errorcodesshouldbecheckedand,whenapplicable,forwardedtotheca

LicensesforpatchesmustbecompatiblewithFFmpeg.ContributionsshouldbelicensedundertheLGPL2.1,includingan"oranylaterversion"clause,or,ifyoupreferagift-stylelicense,theISCorMITlicense.GPL2includingan"orany

IntheRFCmode,onepersonfromtheTCpostsonthemailinglistthetechnicalquestionandwillrequestinputfromthecommunity.Themailwillhavethefollowingspecification:aprecisetitleaspecifictag[TCRFC]atop-levelemailcontainaprecise

ThedecisionsfromtheTCwillbesentonthemailinglist,withthe[TC]tag.Internally,theTCshouldtakedecisionswithamajority,orusingranked-choicevoting.EachTCmembermustvoteonsuchdecisionaccordingtowhatis,intheirview,bestfor