Ffmpeg filtergraph. Dec 28, 2023 · Filtergraph, Chain, Filter relationship What follows the -vf in an ffmpeg command line is a filtergraph description. 1k次，点赞20次，收藏13次。FFmpeg 的是一个强大的多媒体滤镜处理框架，允许你对音视频流进行各种处理（如缩放、裁剪、格式转换、混音等）。以下是关于 AVFilter 和 Filter Graph 的核心用法。_libavfilter如何实现对avframe的伸缩 Aug 3, 2020 · 0 I am using ffmpeg C API to develop some video mix program, and I use ffmpeg scale, crop and overlay filter to implement this. h. However, to filter: ffmpeg -i input. Zero (the default) means that the number of threads is determined automatically. The foreground color expressions can use the following variables: MIN Minimal value of metadata value. Definition at line 839 of file avfilter. c，对照着滤镜部分看。 Sep 11, 2020 · FFMpeg C++ How to create a filter with multiple outputs? Ask Question Asked 5 years, 5 months ago Modified 5 years, 5 months ago Aug 12, 2025 · 文章浏览阅读1. Jan 24, 2026 · Filter Architecture and Graph Parsing Relevant source files This document describes the architecture of libavfilter's filter system and how textual filtergraph descriptions are parsed into executable filter graphs. how to set codec like time clip? Mar 16, 2026 · Step-by-step guide to fFmpeg on Rocky Linux 9|AlmaLinux 9|Oracle Linux 9. rate, r Set the output frame rate. It covers the parsing of filter specifications (via -vf, -af, and -filter_complex options), the creation and configuration of filtergraph instances, and how they are bound to decoders and encoders in FFmpeg Command Visualizer: Interactive Graph Generator for Complex Commands Unlock the hidden structure of FFmpeg commands with our web-based visualization engine, designed for developers, video engineers, and multimedia educators. A filtergraph is considered valid if all the filter input and output pads of all the filterchains are connected. See the ffmpeg-filters manual for more information about the filtergraph syntax. mp4 if combined: Filtergraph 'crop=100:100:0:0' was defined for video output stream 0:0 but codec copy was selected. Dec 11, 2025 · The Filter Graph System is the core infrastructure in libavfilter that enables complex audio and video processing pipelines. Referenced by filtergraph_is_simple (). Quick Reference When to Use This Skill Use for complex filtergraph operations: Multi-input compositions (PiP, grids, overlays) Video transitions and effects Audio mixing and routing Stream splitting for multiple outputs GPU + CPU hybrid processing For basic filters: use ffmpeg-fundamentals-2025 For hardware acceleration: use ffmpeg-hardware Feb 5, 2026 · FFmpeg media processing. But my input video stream does change resolution frequently. Feb 5, 2026 · When to Use This Skill Use for complex filtergraph operations: Multi-input compositions (PiP, grids, overlays) Video transitions and effects Audio mixing and routing Stream splitting for multiple outputs GPU + CPU hybrid processing For basic filters: use ffmpeg-fundamentals-2025 For hardware acceleration: use ffmpeg-hardware-acceleration Contribute to tong2prosperity/ffmpeg-6. Filtering in FFmpeg is enabled through the libavfilter library. The default value is 900x256. -- In asubboost it's not yet clear how the block diagram of the filter looks like. See the ffmpeg-filters manual for more information about the filtergraph Feb 26, 2022 · Edited: They are treating (the decoder + buffersrc) as a source system which outputs frames to the in pads of filter_descr filtergraph, and (buffersink + the encoder) as a destination system which receives its inputs from the out pads of filter_descr filtergraph. It's not quite make sense in resolution changing cases if > >> user wants the rawvideo without any scale. 4 days ago · 🎬 DLSS 5 Anything - Local Video Creation Tool GPU-free video generation using ffmpeg + PIL/Pillow Create professional-looking comparison videos, music videos, and social media shorts without any GPU or AI models - just pure local processing. Nov 28, 2018 · ffmpeg -ss 0 -t 8 -i input. Filter graphs define how audio and video frames are processed through sequences of filters. FFmpeg filtergraph editor in the browser. It is possible to specify swscale flags for those automatically inserted scalers by prepending sws_flags=flags; to the filtergraph description. Referenced by configure_filtergraph (), and configure_input_audio_filter (). Feb 25, 2019 · 在 FFmpeg 中，滤镜 (filter)处理的是未压缩的原始音视频数据 (RGB/YUV视频帧，PCM音频帧等)。 一个滤镜的输出可以连接到另一个滤镜的输入，多个滤镜可以连接起来，构成滤镜链/滤镜图，各种滤镜的组合为 FFmpeg 提供了丰富的音视频处理功能。 Dec 15, 2017 · 文章浏览阅读2k次。本文介绍了FFmpeg中的两种滤镜系统：simplefiltergraphs和complexfiltergraphs。前者用于线性处理，如去交织和缩放；后者则适用于复杂的多输入多输出场景。还对比了滤镜处理与流复制的不同。 1 day ago · See the ffmpeg-filters manual for more information about the filtergraph syntax. 今天要介绍FFmpeg中的AVFilter模块进行帧数据处理的开发，AVFilter模块对帧数据处理进行了很好的抽象。 AVFilter中的filter graph（滤波器图）概念非常适合帧数据处理中的多级滤波处理，同时对滤波器的接口进行了规定，后期添加一些自定义的 滤波器 也是很方便。 Dec 28, 2023 · Filtergraph, Chain, Filter relationship What follows the -vf in an ffmpeg command line is a filtergraph description. Referenced by configure_filtergraph (), ff_graph_thread_init (), fg_create (), and video For the syntax of this option, check the "Video size" section in the ffmpeg-utils manual. Oct 23, 2018 · 这样 FFmpeg 就把驱动的能力交给了 filter 框架外面来做，通过向 filter graph 的首个 filter 推数据和从 filter graph 的末尾 filter 拉数据从而驱动整个 filter graph 的数据流动。 Apr 17, 2021 · 在使用FFmpeg开发时，使用AVFilter的流程较为复杂，涉及到的数据结构和函数也比较多，那么使用FFmpeg&#160;AVFilter的整体流程是什么样，在其执行过程中都有哪些步骤，需要注意哪些细节？这些都是需要我们整理和总结的。 首先，我们需要引入三个概念结构体：AVFilterGraph Jan 12, 2018 · Maximum number of threads used by filters in this graph. On 2/15/20, Fu, Linjie < [email protected] > wrote: >> -----Original Message----- >> From: ffmpeg-devel < [email protected] > On Behalf Of >> Nicolas George >> Sent Jan 26, 2019 · Considered implementations [A] Implement a custom sink filter ( part of libavfilter ) to implement my custom logic [B] Implement a custom sink filter to grab the output samples and send them out to my application ( something similar to DShow SampleGrabber ) With feedback from @kesh, we arrived at using the concat demuxer to process the subtitles and combine that with reading the audio and video streams into a complex filtergraph. It is possible to specify swscale flags for those automatically inserted scalers by prepending sws_flags= flags; to the filtergraph description. Filtering in FFmpeg is enabled through the libavf Dec 2, 2025 · This document describes the textual syntax used to specify filter graphs in FFmpeg. What's the input of the the delay line? Before or after the low pass filter? Where does the feedback go to? Before or after the lowpass filter? I have attached a sketch of a possible block diagram, but it's only a wild guess. Filtering and streamcopy cannot be used together. A trivial example of a complex filtergraph is the overlay filter, which has two video inputs and one video output, containing one video overlaid on top of the other. Contribute to VineshChauhan24/ffmpeg-kit-android-16kb-lts-full-gpl development by creating an account on GitHub. mp4 can set codec. Referenced by configure_input_audio_filter (), configure_input_video_filter (), create_streams (), fg_create (), fg_thread_set_name (), ifilter_bind_fg (), map_manual (), ost_add (), print_filtergraph_single (), and send_command (). Especially the "decay" and "feedback" options are unclear. Thus the variable naming conventions in this example. png -filter_complex 'overlay' avi. See the documentation of the fps filter for details. > >> > >> Using autoscale/noautoscale as an output option to indicate whether auto > >> inserting the scale filter in the filter graph: > >> -noautoscale or -autoscale 0: > >> disable the default auto scale filter inserting Enhance Claude Code with FFmpeg Media capabilities. Sep 15, 2019 · 本文详解如何通过FFmpeg API实现Filter Graph功能，介绍buffer和buffersink关键滤镜的使用方法，分享视频帧处理流程及time_base时间转换技巧，帮助开发者掌握复杂视频滤镜处理技术。 Apr 2, 2019 · FFmpeg的命令行中，滤镜 (广义)的出现形式有滤镜 (狭义)、滤镜链、滤镜图三种形式，但滤镜 (狭义)和滤镜链可以看作是特殊的滤镜图，因此，为了简便，FFmpeg的命令行中滤镜相关选项，只针对滤镜图 (filtergraph)概念，分为如下两类： May 4, 2023 · FFmpeg滤镜API教程 跟滤镜有关的数据结构有以下： AVFilterGraph， 滤镜容器，里面可以有多个 滤镜上下文 AVFilterInOut，滤镜链表， avfilter_graph_parse2 函数有时候会设置这个结构体，开放输入跟输出给 其他的滤镜上下文 来链接。 AVFilterContext， 滤镜上下文，可以看成是滤镜的实例 AVFilter，滤镜信息。 跟 Jan 12, 2018 · Maximum number of threads used by filters in this graph. This document describes filters, sources, and sinks provided by the libavfilter library. Mar 11, 2019 · I'm using libavfilter C API to scale my video. 1 development by creating an account on GitHub. 引言及示例 FFmpeg中的libavfilter提供了一整套的基于filter的机制。filter本身是一个插件的形式，可以快速的组装需要的效果。 比如下面的filte Jan 8, 2017 · Definition at line 78 of file ffmpeg_filter. Video/audio transcoding, stream manipulation, and filter graphs. A filtergraph is setup here using the -filter_complexoption and consists of a single video filter. Includes commands, verification, and troubleshooting. A filter with no input pads is called a "source", and a filter with no output pads is called a "sink". Powered by libavfilter, Vue and Web Assembly! - alfg/filtergrapher Jan 8, 2017 · Definition at line 295 of file ffmpeg. It offers five rounding modes that affect which source frames are dropped or duplicated in order to achieve the target framerate. 1 Description. Referenced by cleanup_filtergraph (), configure_filtergraph (), ffmpeg_cleanup (), flush_encoders (), ifilter_has_all_input_formats (), init_input_filter (), init_simple_filtergraph (), and transcode_from_filter (). Dec 28, 2023 · What follows the -vf in an ffmpeg command line is a filtergraph description. I don't understand the terminology "filter pads". Jun 7, 2025 · 我认为FFmpeg的avfilter是几个模块中使用难度最高的模块，原因包括如下几点： 功能发散：其他模块功能单一，filter模块功能五花八门。一个filter有哪些功能，一个功能如何用filter实现，对于资深开发者也是个相当… Apr 27, 2020 · ffmpeg "filtergraph join" to use copy of channels and preserve input channel configuration (format - s32_le) Asked 5 years, 7 months ago Modified 5 years, 7 months ago Viewed 374 times 今天要介绍FFmpeg中的AVFilter模块进行帧数据处理的开发，AVFilter模块对帧数据处理进行了很好的抽象。 AVFilter中的filter graph（滤波器图）概念非常适合帧数据处理中的多级滤波处理，同时对滤波器的接口进行了规定，后期添加一些自定义的 滤波器 也是很方便。 Jun 2, 2021 · 滤镜在FFmpeg里还分简单滤镜链和复杂滤镜链，一般的单入单出的为简单滤镜链，我们先讲简单的。 二、如何使用滤镜 使用滤镜有2种方式，我们就先讲很多demo里面都有的一种，就是使用avfilter_graph_parse_ptr。 FFmpeg的example里有个filtering_video. In the filtergraph, the input is associated to the label @code {in}, and the output to the label @code {out}. All the media I/O operations in ffmpegio support FFmpeg filtering via per-stream filter, vf, af, and filter_script output options as well as the filter_complex and filter_complex Jan 8, 2017 · Definition at line 396 of file ffmpeg. May 11, 2019 · 3 Yes, it matters how the filtergraph is ordered. Jan 8, 2017 · Definition at line 329 of file ffmpeg. [main] input --> split ---------------------> overlay --> output | ^ | [tmp] [flip]| +-----> crop --> vflip -------+ This filtergraph splits the Filter Some examples base on ffmpeg apis View on GitHub Filter 通过API实现Filter Graph FFmpeg提供了很多实用且强大的滤镜,比如:overlay, scale, trim, setpts等等。 通过 -filter-complex 的表达式功能，可以将多个滤镜组装成一个调用图，实现更为复杂的视频剪辑。如何通过代码实现这个功能呢？ 首先按照前面几篇的套路，在 Nov 21, 2023 · 至此， configure_filtergraph() 函数的源码分析完毕。 这个函数异常复杂，建议多调试几次源代码，但是这个 configure_filtergraph() 函数又封装得特别好，有时候对 ffmpeg. c. how to set codec like time clip? Mar 11, 2019 · I'm using libavfilter C API to scale my video. Oct 26, 2012 · Parameters: graphctx the filter graph filter the filter to be added Definition at line 66 of file avfiltergraph. mkv I can add -acodec copy but not -vcodec copy, this gives the error: Streamcopy requested for output streaam 0:0, which is fed from a complex filtergraph. exe 里面是可以有多个 FilterGraph 的，例如音频的 FilterGraph ，视频的 FilterGraph 。 视频也可以定义多个 FilterGraph ，视频的多个 FilterGraph 我没找到命令行例子，后续补充。 It will become the default at the next libavformat major bump. A filtergraph is a directed graph of connected filters. exe 二次开发，你甚至可以不去理解 configure_filtergraph() 的内部实现，只需要它执行完之后，输入流绑定 Jan 8, 2017 · Maximum number of threads used by filters in this graph. MAX Maximal value of metadata value. - decent native animated GIF encoding - asetrate filter - interleave filter - timeline editing with filters - vidstabdetect and vidstabtransform filters for video stabilization using the vid. It automatically generates the filtergraph string for you, and I added handy features like autocomplete for filter names Feb 26, 2022 · Edited: They are treating (the decoder + buffersrc) as a source system which outputs frames to the in pads of filter_descr filtergraph, and (buffersink + the encoder) as a destination system which receives its inputs from the out pads of filter_descr filtergraph. Libavfilter will automatically insert scale filters where format conversion is required. 2 Filtering Introduction. Simple filtergraphs Simple filtergraphs are those that have exactly one input and output, both of the same type. See the official FFmpeg Filters Documentation and FFmpeg Wiki articles on Filtering. 1k次，点赞20次，收藏13次。FFmpeg 的是一个强大的多媒体滤镜处理框架，允许你对音视频流进行各种处理（如缩放、裁剪、格式转换、混音等）。以下是关于 AVFilter 和 Filter Graph 的核心用法。_libavfilter如何实现对avframe的伸缩 Nov 21, 2023 · FilterGraph 的各个字段的解释如下： 1， int index，全局变量 filtergraphs 数组里的索引， ffmpeg. See the -filter_complex option if you want to create filtergraphs with multiple inputs and/or outputs. A simple video filtergraph that performs deinterlacing (using the @code {yadif} deinterlacer) followed by resizing (using the @code {scale} filter) can look like Contribute to Graph-EAjks/Blender-Lib-MacOS_ARM64 development by creating an account on GitHub. This filtergraph may contain a number of chains, each of which may contain a number of filters. A filtergraph with operations which involve fewer computations or memory operations will be faster. Default value is 25. Aug 12, 2025 · 文章浏览阅读1. Video filters which change the resolution or pixel format or any action which cannot modify the frame in-place, need to generate a new frame and compute new pixel values, and so will take more time. Dec 2, 2025 · FilterGraph Integration Relevant source files Purpose and Scope This document describes how filter graphs are created from command-line options and integrated into the ffmpeg transcoding pipeline. exe 二次开发，你甚至可以不去理解 configure_filtergraph() 的内部实现，只需要它执行完之后，输入流绑定 When using ffmpeg -i video. avi -i image. FILTERINGINTRODUCTION Filtering in FFmpeg is enabled through the libavfilter library. It's not quite make sense in resolution changing cases if user wants the rawvideo without any scale. It can contain cycles, and there can be multiple links between a pair of Filtergraph Builder Reference One of the great feature of FFmpeg is the plethora of filters to manipulate video and audio data. To illustrate the sorts of things that are possible, we consider the following filtergraph. Oct 27, 2016 · Maximum number of threads used by filters in this graph. Definition at line 615 of file avfilter. Oct 17, 2013 · FFMpeg Concatenation Filters: Stream specifier ':0' in filtergraph matches no streams Asked 12 years, 5 months ago Modified 7 years, 3 months ago Viewed 16k times Nov 21, 2023 · 至此， configure_filtergraph() 函数的源码分析完毕。 这个函数异常复杂，建议多调试几次源代码，但是这个 configure_filtergraph() 函数又封装得特别好，有时候对 ffmpeg. Referenced by ff_filter_get_nb_threads (), and ff_graph_thread_init (). Each filter in a filtergraph is an instance of a filter class registered in the application, which defines the features and the number of input and output pads of the filter. Referenced by configure_filtergraph (), ff_filter_get_nb_threads (), and ff_graph_thread_init (). stab library - astats filter - trim and atrim filters - ffmpeg -t and -ss (output-only 36 FFmpeg has a number of video generating filters, listed in the documentation as "video sources": cellauto color mptestsrc fei0r_src life nullsrc, rgbtestsrc, testsrc Those are great for using with other filters like overlay, but is there any way that I can generate a movie consisting of just one of those video sources without any input video? May 21, 2021 · Invalid file index 14 in filtergraph description - FFMPEG Ask Question Asked 4 years, 10 months ago Modified 4 years, 10 months ago Oct 17, 2013 · FFMpeg Concatenation Filters: Stream specifier ':0' in filtergraph matches no streams Asked 12 years, 5 months ago Modified 7 years, 3 months ago Viewed 16k times Jun 2, 2021 · 滤镜在FFmpeg里还分简单滤镜链和复杂滤镜链，一般的单入单出的为简单滤镜链，我们先讲简单的。 二、如何使用滤镜 使用滤镜有2种方式，我们就先讲很多demo里面都有的一种，就是使用avfilter_graph_parse_ptr。 FFmpeg的example里有个filtering_video. 2 days ago · In the filtergraph, the input is associated to the label in, and the output to the label out. Currently, ffmpeg inserts scale filter by default in the filter graph to force the whole decoded stream to scale into the same size with the first frame. It manages the construction, configuration, and execution of interconnected Apr 17, 2021 · 在使用FFmpeg开发时，使用AVFilter的流程较为复杂，涉及到的数据结构和函数也比较多，那么使用FFmpeg&#160;AVFilter的整体流程是什么样，在其执行过程中都有哪些步骤，需要注意哪些细节？这些都是需要我们整理和总结的。 首先，我们需要引入三个概念结构体：AVFilterGraph Feb 4, 2021 · fps, as a filter, needs to be inserted in a filtergraph, and will always generate a CFR stream. If you make a nice filtergraph in the tool, just hit cmd-s (or ctrl-s on windows/linux), and it will export a json file of your graph. Sep 10, 2015 · libavresample options to use for the auto-inserted resample filters Definition at line 1183 of file avfilter. My program works well when the input video's resolution keep unchanged. mp4 -vf crop=100:100:0:0 output. The overlayfilter requires exactly two video inputs, but none are Hey guys, I spend a lot of time generating long and cumbersome FFmpeg complex filters for my project (modfy. FFmpeg filter graph visualization tool. Transcode video, extract audio, and apply complex filter graphs with AI-driven media processing tools. Definition at line 884 of file avfilter. I started to read the documents related to libavfilter and got stuck at Filtergraph-description. Mar 17, 2023 · 基础 filter: 数据处理器 filter_chain: 链表链接链接所有的filter filter_graph：数据处理管理器 查看filter的相关事项:ffmpeg -h filter=filter_name $ ffmpeg -h filter=crop Filter crop Cro Aug 31, 2016 · [时间：2016-08] [状态：Open] [关键词：FFmpeg, filter, filter graph，命令行] 1. 1. This tool transforms complex command-line syntax into interactive flow diagrams. video), and I was having such a miserable time reading the filtergraph syntax so I built a node-based visualizer and editor for complex filter graphs in my spare time. It covers the core data structures, filter registration mechanism, filtergraph syntax, and graph parsing implementation. Referenced by configure_filtergraph (). VAL Current metadata key value. In the above diagram they can be represented by . I'm also looking for good FFmpeg examples. Referenced by configure_filtergraph (), ff_graph_thread_init (), fg_create (), and video Sep 12, 2022 · ffmpeg Stream specifier ':a' in filtergraph description matches no streams for muted audio Ask Question Asked 3 years, 6 months ago Modified 3 years, 6 months ago 3 days ago · See the ffmpeg-filters manual for more information about the filtergraph syntax. In libavfilter, a filter can have multiple inputs and multiple outputs. mp4 -acodec copy -vcodec copy output. 127 stars | by majiayu000 output. Contribute to Stevring/fffv development by creating an account on GitHub. c，对照着滤镜部分看。 Maximum number of threads used by filters in this graph. Definition at line 813 of file avfilter. Jan 8, 2017 · Definition at line 396 of file ffmpeg. May be set by the caller before adding any filters to the filtergraph. dmahh ixwreu iemvfg gjvb zdhis kkpe hlem qlrt jwkpk dwlsa