Ffmpeg amix vs amerge. all kinds of permutations and combinations.

Ffmpeg amix vs amerge -filter_complex So the basic pipeline: Export MXF from Avid with "Direct Out" (i. mp4 -filter_complex "[0:a]amix=inputs=4[a]" -map 0:v -map "[a]" -c:v copy out. webm -filter_complex " 现在，我们使用FFmpeg来实现音频混音和频率amerge。首先，我们需要准备两个音频文件，分别命名为audio1. This example is from man mpv:. mp4 Manually mixed stereo. I tried filter "amix": (for testing purposes I take audio-stream 2 times from the same camera. In @mark40 Thanks for delay help it's working. Default is 2. ffmpeg的滤波filter有amix这个混音器，可以借助它来做音频的多路混音。首先我们需要编译ffmpeg并安装它，可以具备编码功能，考虑可以加mp3或者aac编码库进来，最简单的方式是编码成pcm格式直接输出到文件，用VLC也可以播放。因此输出文件只有一个立体声数据流。我尝试过不同的方法，但不清楚如何管理其中的流和通道。找不到有关如何执行此操作的示例。我尝试过使用-filter_complex、amix和amerge过滤器，以及-map参数，但似乎找不到正确的值组合。下面是 FFmpeg版本4. I have 3 consecutive FFmpeg commands that will customize the volume of an audio, customize the volume of a video, and amerge audio and video to a final output. webm -i vid15. 混音，把所有输入音频流混合成单个音频流。该滤镜仅支持浮点采样格式。如果是整型采样格式，会自动转换成浮点 With amix: ffmpeg -i in. wav (10 mins), 1800-new. 使用amerge和pan及自定义混音：通道0将100%在FL中 ffmpeg amerge and amix filter delay. webm -i input3. ffmpeg -i video. 7w次，点赞2次，收藏16次。本文详细介绍了如何使用ffmpeg进行音视频混音操作，包括使用amerge和amix进行音频混音，简单和复杂的音视频混合方法，并讲解了调整音量和循环较短输入的技巧。 Note that this filter only supports float samples (the amerge and pan audio filters support many formats). However, if you already know the pan filter and use this for the first time, you may be a little confused. mp3 -filter_complex amix=inputs=2:duration=shortest mixed_audio. mp3 I am trying to use ffmpeg to merge two audios, in. 2[A];[0:a][A]amix=inputs=2:duration=first[Aout]" -map 1:v -map [Aout] -y mergemin. I have 3 audio files: 0-new. This is the closest i've gotten but for some reason it's still only including the first channel: ffmpeg -loglevel verbose -i multitrack_audio_test. mp3 But the final output res. yes, I tried 2 cameras - ffmpeg命令中可以使用filter amix实现这个功能。 Note that this filter only supports float samples (the amerge and pan audio filters support many formats). 将两个或多个音频流合并成单个多通道流。 The filter accepts the following options: inputs Set the number of inputs. I noticed that ffmpeg amix filter doesn't output good result in specific situation. Mixes multiple audio inputs into a single output. 我需要从几个IP摄像机中获取音频流，并将它们合并到一个文件中，这样它们听起来就会相同。我试着过滤"amix"：(为了测试的目的，我从同一个摄像头上取了2次音频流。是的，我试了两个摄像头-结果是一样的)ffmpeg -i rtsp://user:pass@172. com> wrote: > > On 6/8/2024 5:46 ffmpeg -i input1 -i input2 -filter_complex "amix=inputs=2:duration=longest:dropout_transition=2:weights=1 1" output ffmpeg -i input1 -i input2 -filter_complex "amix=2:longest:2:1 1" output. It accepts the following parameters: The number of inputs. [2:a] would represent the first audio stream (same as [2:a:0]). amerge on the other hand is used to combine two or more inputs, I have read that amix combines multiple audio inputs into a single channel output and amerge combines multiple audio streams into a single multiple channel stream. If the amix input has integer samples then aresample will be automatically inserted to perform FFmpeg 7. mkv 8. mp3, like this: ffmpeg -i in. mp4 -vol 200 video2. Now when I give delay for stream2 It is not consistence, means if I run command one time and then second time then delay between stream changes every time so I have to change delay FFmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. mp3 或amerge过滤器： ffmpeg -i input0. If the amix input has integer samples then aresample will be automatically inserted to perform the conversion to 文章浏览阅读3. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. 使用amerge和-ac 2： ffmpeg -i in. mp3 . If you need gain control as well as channel remapping, what you want is probably a pan filter. If you just use [2], the stream is auto-selected based on type of filter i. mp4 -filter_complex "[0:a]amerge=inputs=4[a]" -ac 2 -map 0:v -map "[a]" -c:v copy out. A couple things you can try: (1) run ffprobe -show_entries stream=duration FILE on input and output video files involved and make sure audio stream durations match (or short in case of the output) (2) try adding aresample=48k to mp3 input to explicitly match the sampling amix使って音声マージしたらなんか音小さいんだけど。。はい。やらかしました。ffmpegを使う機会があり、音周りロジックの修正をしたのですが、なんかもともとあったやつより音小さくなってました。。使用amix过滤器： ffmpeg -i input0. 35 amix Mixes multiple audio inputs into a single output. Stack Exchange Network. soumya at ffmpeg -y -i video. In that case volume is dropped in constant value and could be fixed with ",volume=2". af_amix能满足大部分场景应用，尤其对音量变小不敏感的场景。另外，结合 loudnorm 或 dynaudnorm 音频滤波器辅助提升音量，也可以缓解混音后音量变小的问题。. ; Example with volume filter:. If the amix input has integer samples then aresample will be automatically inserted to perform the conversion to float samples. mka -filter_complex "[0]aresample=async 文章浏览阅读3. [FFmpeg-user] amix vs amerge / how to Media Mouth communque at gmail. When I run ffmpeg 'volumedetect' it gives these outputs: 1. mp4 -filter_complex "[1:a]volume=0. 異なる尺の音声を混ぜて音量が大きくなるのを回避するにはdropout_transitionで時間調整する。normalize=0にする。使用ffmpeg实现合并多个音频为一个音频的方法. , but nothing seems to help. all timeline audio tracks sent to discreet channels in the MXF) and then use FFmpeg to mix down the audio Mixes multiple audio inputs into a single output. Previous message (by thread): [FFmpeg-user] amix vs amerge / how to Next message (by thread): [FFmpeg-user] amix vs amerge / how to Messages sorted by: On 6/8/2024 5:46 PM, Media Mouth wrote: > I'm trying to merge multiple calls to ffmpeg into one single call. Improve this answer. g. I've explained this in the ticket as well. FFmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. mp3 -i voice. wav (4 mins) I want to discard the video's audio and replace it with Next message (by thread): [FFmpeg-user] amix vs amerge / how to Messages sorted by: Following up Here's an attempt at re-mapping audio using "channelmap" as opposed to amix, amerge, or join input. " 使用ffmpeg实现合并多个音频为一个音频的方法. 26 amix. 22. 15 amerge Merge two or more audio streams into a single multi-channel stream. I tried filter "amix": (for testing purposes I take audio-stream 2 time [FFmpeg-user] amix vs amerge / how to Media Mouth communque at gmail. The command I used was: ffmpeg. mp3 注： amerge 与amix 前言 FFMPEG是特别强大的专门用于处理音视频的开源库。你既可以使用它的API对音视频进行处理，也可以使用它提供的工具，如 ffmpeg, ffplay, ffprobe，来编辑你的音视频文件。 FFMpeg命令行学习笔记（5）ffmpeg中的amerge指令. mp3 Second command, edit volume level of a mp4 file. mp3 -vol 100 music2. Neither amix nor amerge seem to have an option to include all automatically. Funny thing is, unlike amerge/join, amix actually has a duration Next message: [FFmpeg-user] amix/amerge with offset Messages sorted by: Le decadi 30 frimaire, an CCXXI, Soumya M D a écrit : > Is there any way to merge/mix two audio files with offsets > > I want to start my first audio at 10 the second,second at 20 second like > that. 8k次。本文详细介绍了如何使用ffmpeg进行音频混音，包括amerge和amix的使用，以及简单的音视频混合和复杂情况下的音频合并。此外，还涵盖了调整音频音量和循环较短输入的操作。 ffmpeg amerge 使用简介一、实现思路 ffmpeg的滤波filter有amix这个混音器，可以借助它来做音频的多路混音。首先我们需要编译ffmpeg并安装它，可以具备编码功能，考虑可以加mp3或者aac编码库进来，最简单的方式是编码成pcm格式直接输出到文件，用VLC也可以播本文介绍了如何使用FFmpeg进行音频和视频处理中的混音和音视频混合操作。通过使用FFmpeg的强大功能，我们可以轻松地合并音频信号、调整音量平衡，以及将音频和视频进行混合生成新的多媒体文件。例如，我们可以使用FFmpeg调整音频的音量、剪辑音频和视频的片段、添加文本和水印等。 af_amix不足. Share. mp4 立体声. First command, edit volume level of a mp3 File. mpv --lavfi-complex='[aid1][aid2]amix[ao]' input. output channel to define, either a channel name (FL, FR, etc. It works fine if input files have equal duration. mpv --lavfi 学习音视频处理，ffmpeg的常用命令行指令是必须掌握的。通过这些指令可以实现各种各样的音视频基本操作。这里对ffmpeg的常用命令进行了汇总，供大家参考。需要注意的是，指令在不同平台上的使用方式略有差异，注意区分。 7. com Sun Jun 9 08:12:58 EEST 2024. mp3和audio2. pan, channelsplit, join, amix, amerge. amerge is designed for building a multichannel stream out of many inputs. wav (10 mins), 1200-new. com> wrote: > Following up on an earlier post "amix vs amerge / how to" but now testing > on ffmpeg version 7. mp3 -filter_complex amerge=inputs=2 -ac 2 output. Using amerge and pan with custom downmix: Channel 0 will be 100% in FL out_name:. so in your case : ffmpeg -i input1. With amerge and -ac 2: ffmpeg -i in. exe -y -i song. Use the amerge and pan filters: 34 音频滤镜. 2k次，点赞2次，收藏4次。本文详细介绍了如何使用ffmpeg进行音频合成及应用-itsoffset命令实现音频延迟播放，包括安装 ffmpeg 和 yasm、使用 amix 命令进行音频混合、以及通过-itsoffset 实现特定延迟播放的步骤。 Specify input duration of one of ffmpeg's amerge/join inputs Audio encoding. mp3 After that complex filter, my final output is completely distorted. 特例说明：三路音频均值混音时，如果正好有两路声音是静音，整个混音结果将是第三路的三分之一。 Previous message: [FFmpeg-user] ffmpeg amerge and amix filter delay Next message: [FFmpeg-user] Capture from USB Dazzle: Interlaced or not interlaced. mp4 ffmpeg -i ffmpeg -i music. So the former will always truncate when streams are of different length. amerge也可以实现，但是这里就介绍一下使用amix来做的方法 ffmpeg的filter功能强大的功能能够满足几乎所有的音视频操作，包括合并音频一、实现思路. I have video. e. 4版本，通过设置延迟时间和通道处理实现精确混文章浏览阅读851次。代表某一filter，[in0][in1][in2]代表的是输入节点，amix是混音滤波器=inputs=3这个是参数表示输入是3个，[out]表示输出。ffmpeg的滤波filter有amix这个混音器，可以借助它来做音频的多路混音。首先我们需要编译ffmpeg并安装它，可以具备编码功能，考虑可以加mp3或者aac编码库进来，最简单 . I don't see anything wrong with the log. mp3 -filter_complex "[0:a] [1:a]amerge=inputs=2[aout]" -map "[aout]" -ac 2 The format option may be needed for raw input files. mka -i pedro_2. No reaction since. 05, Paul B Mahol wrote: -snip- > If you do not explicitly set expression for both pts The above code applies adelay to delay the audio you're mixing in to start at a certain time (in milliseconds) and then applies amix to add it to the audio already present in the video. In short, amix mixes two or more inputs into one output, an example would be adding commentary on top of gameplay audio. mp4 so i've been trying amerge, amix, map_channel and pan, all of which ALMOST work but I can't make them work. com Sun Jun 9 09:19:21 EEST 2024. Viewed 218 times I've tried multiple additional filters within FFmpeg, including pan, amix, volume, etc. amerge也可以实现，但是这里就介绍一下使用amix来做的方法 . I have another m4a file that I want to merge with the already-existing audio stream in the video. aid1). )gain:. Modified 3 years, 11 months ago. Ask Question Asked 9 months ago. mp4 手动混合立体声. 5 流程图关键函数avfilter_graph_alloc()：分配过滤器图avfilter_graph_parse_ptr()：将由字符串描述的图形添加到图形中。在图形过滤器描述中，如果第一个过滤器的输入标签没有指定，则假定为“in” For multiple inputs or outputs use --lavfi-complex. ) or a channel number (c0, c1, etc. I have 2 images, 1 video, and 1 sound to merge together. I need to take audio-streams from several IP cameras and merge them into one stream, so that they would sound simaltaneousely. 05, Paul B Mahol wrote: -snip- > If you do not explicitly set expression for both pts and dts options, they > will be set to same value later. mp3 -i audio2. Version Matrix Source adynamicsmooth aecho aemphasis aeval aexciter afade afftdn afftfilt afir aformat afreqshift afwtdn agate aiir alimiter allpass aloop amerge amix amultiply anequalizer anlmdn anlmf anlms anull apad aphaser aphaseshift apsnr apsyclip apulsator aresample areverse arls arnndn asdr asetnsamples asetrate I tried that and it cuts off the audio of both inputs at the length of the first input but the video continues silently. 11. FFV1 level3 vs h264 Messages sorted by: On 11/2/15, Paul B Mahol <onemda at gmail. The m4a file is about 10 seconds shorter than the other audio stream, and according to the FFmpeg docs:. To do this I am trying to use the amix filter, but FFmpeg seems to hang when I run the comma Audio clipping after amerge in FFmpeg. 4k次，点赞2次，收藏7次。一、实现思路ffmpeg的滤波filter有amix这个混音器，可以借助它来做音频的多路混音。首先我们需要编译ffmpeg并安装它，可以具备编码功能，考虑可以加mp3或者aac编码库进来，最简单的方 FFmpeg还支持混音功能，即多个音频轨道合成到一个轨道中。文档提供了FFmpeg混音的参考文档，以及一些混音的基本操作和技巧。对于有特定需求的用户，FFmpeg也支持定义复杂的滤镜链，滤镜链中可以包含多个顺序连接的 2、amix. mp3 -filter_complex amix=inputs=2:duration=longest output. mp4 im trying to have the audio file be the actual determinant of the length of the 文章浏览阅读2k次。本文详细介绍了如何利用ffmpeg的adelay和amix滤镜，在指定时间点将多个音频文件混合到一起。例如，如何让B、C文件在第5秒和第15秒开始与A文件混音，并生成输出文件。提供的命令适用于ffmpeg 4. 5[a1];[0:a:0][a1]amerge=2[aout]" -map "[aout]" Now, what exactly is your goal here? If you just want to mix two audio streams, using the amix filter would be much easier. ffmpeg的filter功能强大的功能能够满足几乎所有的音视频操作，包括合并音频 . yes, I tried 2 cameras - 在FFmpeg中，可以使用 amix 音频滤镜来将两个单声道音频流合并成一个双声道音频流。这个滤镜允许你在时间上混合多个音频流。以下是一个将两个单声道音频合并成双声道音频的示例：使用amix： ffmpeg -i in. The program’s operation then consists of input data chunks flowing from the sources down the pipes towards the sinks, while being transformed by the components they encounter along the way. 当你配置编译FFmpeg时，先采用--disable-filters可以禁止所有的滤镜，然后显式配置想要支持的滤镜。. mp4 -i test. Anyone have any ideas? Pasting the relevant section of my script for reference: Next message (by thread): [FFmpeg-user] amix vs amerge / how to Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] On 08/06/2024 12. 08-24 514 amerge terminates with the shortest input (always) and amix terminates with the longest input, by default. 1 amerge-ac 2 speed up ffmpeg-i test. -i track[N]. INPUT=input. Thanks for the help. com Thu Dec 20 23:35:45 CET 2012. 3 Detailed description. mkv -filter_complex "[0:1][0:2][0:3][0:4][0:5][0:6] amerge=inputs=6" -c:a pcm_s16le output. Previous message: [FFmpeg-user] amix/amerge with offset Next message: [FFmpeg-user] Problem with running configure while installing ffmpeg Messages sorted by: On 12/20/12, Soumya M D <md. Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion. com> wrote: > Dana 2. If the amix input has integer samples then aresample will be automatically inserted to 使用ffmpeg AVfilter 中的amix实现混音，灰信网，软件开发博客聚合，程序员专属的优秀博客文章阅读平台。 Note that this filter only supports float samples (the amerge and pan audio filters support many formats). those represent the -i inputs starting from zero. Ask Question Asked 3 years, 11 months ago. 202 -map 0:a -map 1:a -filter_ I need to take audio-streams from several IP cameras and merge them into one file, so that they would sound simaltaneousely. ffmpeg -i pedro_1. mp3 -filter_complex amix=inputs=2:duration=first[mix];[mix]volume=2[out] -map [out] output. mka -i michal_1. Like you, I had horrible luck with GPT, it can't figure out and keep going in loops suggesting various combinations of amix instead of amerge, and aformat On Sun, Jun 9, 2024 at 6:51 PM Media Mouth <communque at gmail. 它接受如下选项： I have tried these commands:-filter_complex "amix=inputs=2"-filter_complex "aresample=48000,amix=inputs=2,aformat=channel_layouts=stereo"-filter_complex "amerge=inputs=2" I've tried a bunch of variations on those as well. mp3 -filter_cFFMPEG set volume in amix. 0. I tried to use amerge and amix filters they worked great but both had one problem - the volume in the resulting mix was lower than in in the source files. The ones with letters or other ffmpeg amerge/amix with itsoffset into single audio stream. 延迟一个或者多个音频通道. mp3 -filter_complex amix=inputs=2:duration=longest -c:a libmp3lame res. webm -i input4. I see lots So if the goal is mixdown audio tracks, is it possible using the join filter? or does it requires amix or amerge? ffmpeg -i input. 5. 2:v:0 for a video filter, and 2:a:0 for an audio one. If you simply want to do channel remapping instead, this filter is easier to use than the pan filter. 使用amerge和pan过滤器： FFmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. wav -filter_complex "[0:a][1:a]amerge=inputs=2,adelay=0|7000" output. 9s it's reporting is incorrect). mp4 -i audio. 6. all kinds of permutations and combinations. 1 > > The overall goal here is to learn how (if possible) to take source files > with 10 - 20 audio channels and mixdown / assign those in various ways to >-- 2 channel, 4 channels etc etc -- it depends on 文章浏览阅读3. mp3 Or the amerge filter: ffmpeg -i input0. ffmpeg amerge and amix filter delay. Visit Stack Exchange ffmpeg -i INPUT1 -i INPUT2 filter_complex amix=inputs=2:duration=longest:dropout_transition=3 -ac 2 OUTPUT This sets the output's file duration to longest of input but instead of putting the input1 to left channel and input2 to right channel, it merges them into one and put them in left and right channel. mkv A label of the form aidN selects audio track N as input (e. If inputs do not have the same duration, the output will stop with the shortest. 34 minutes long. Note that this filter only supports float samples (the amerge and pan audio filters support many formats). mxf is a 4-audio channel video file Goal of this test to move a1 to a3, a2 to a4, a3 to a1, a4 to a2 and output the results to a ffmpeg -i input Use the amix filter: ffmpeg -i input0. Previous message (by thread): [FFmpeg-user] amix vs amerge / how to Next message (by thread): [FFmpeg-user] Audio mapping and mixing Messages sorted by: > On Jun 8, 2024, at 22:12, Carl Zwanzig <cpz at tuunq. mp4 Stereo. You can also use amerge instead of amix, but your video might cut off early in that case and you have no control over the resulting volume. mp3 has different volume levels. webm -i input2. mp3 -filter_complex amerge=inputs=[N] -c:a libmp3lame -ar 44100 -q:a 1 mix. The voice sounds overall very loud and saturated. wav This command works when I replace amerge with amix, but when it seems that only the LAST audio has full volume, We may also move adelay to be after amerge: ffmpeg -y -i vide. Before you start posting please read the forum rules. For in. ffmpeg -i rec3. Viewed 110 times 1 . Modified 4 days ago. mp3 将每个输入缩混为特定输出通道. adelay. mp3 -i track1. mp3。接下来，我们使用以下命令进行音频混音： shell ffmpeg -i audio1. ffmpeg builds a transcoding pipeline out of the components listed below. 可以使用ffmpeg的filter功能来进行这个操作，而且效果很好. mp3 -i input1. You can use the concat filter to add silence before any of your audio [x] is a filtergraph pad, where if x = 0,1,2. mp3 Downmix each input into specific output channel. 2 channel + 2 channel = 2 channel output whereas amerge is 2 channel; + 2 channel = 4 channels – If you just want to mix two audio streams, using the amix filter would be much easier. By posting to this forum you agree to abide by the rules. mp3 -i out. description = NULL_IF_CONFIG_SMALL("Scale the input video size and/or convert the image format to the given reference. mp3 I am using amerge two add two audios. I also though about purely copying, without re-encoding the audio, but using the filter_complex, I am unable to do a pure I don't think so (unless 1. mka -i michal_2. Please suggest what's wrong with it. 2. 1. 我遇到了这个错误[AVFilterGraph @ 04f289a0]以下滤镜无法选择其格式： Parsed_amerge_2 请考虑在它们的输入或输出附近插入(a)format过滤器。配置复杂滤镜时出错。错误编号为-5。. Stereo Mix, Stereo music, mono dialogue only, Mono DM&E splits, etc etc. [2:a:2] represents the third input's third audio stream. So just use ffprobe to determine the number of audio streams. webm -i input5. I reported it here a couple of days ago. mov -filter_complex "pan=mono|c0=1*c0+1*c1" -acodec pcm_s16le -ac 1 out6. 202 -i rtsp://user:pass@172. [Parsed_amerge_0 amerge amix. For example: [FFmpeg-user] amix/amerge with offset Roger Pack rogerdpack2 at gmail. . Use the amix filter: ffmpeg -i input0. Hot Network Questions Can the gyroscopic effect be used for landing? How long does tarp last for in storage? How to balance the need for gender equality in seminar organisation with finding suitable presenters Why didn't Esther refuse intercourse with Achashverosh? see also. amerge is designed for building a multichannel stream out of many inputs. mkv with 1 video and 1 audio stream. ffmpeg -i music. But when i change from "amerge" to "amix", then it works on both but slowing down the composition time. my final command, it worked as intended. amerge也可以实现，但是这里就介绍一下使用amix来做的方法 ffmpeg的filter功能强大的功能能够满足几乎所有的音视频操作，包括合并音频 On Sun, Jun 9, 2024 at 6:51 PM Media Mouth <communque at gmail. ; A label named ao will be connected to the audio output. The amerge-filter btw merges -filter_complex "[1:a:0]volume=0. Audio merge1. 下面是当前可用的音频滤镜. I'm not an expert with audio nor with FFmpeg so I assume I'm missing something. [FFmpeg-user] amix vs amerge / how to Carl Zwanzig cpz at tuunq. multiplicative coefficient for the channel, 1 Next message (by thread): [FFmpeg-user] amix vs amerge / how to Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] On 08/06/2024 12. While the target of pan, channelmap, etc, is this, the target of channelsplit, join, amix and amerge is a amix does mixdown i. It accepts the following parameters: inputs you need to delay all the audio channels with the same value using adelay=milliseconds:all=true, and use -async 1 at the end of your command so ffmpeg will just corrects the start of the audio stream instead of stretching/squeezing. mp3 Or the amerge On the other hand, the “audio channel” is “front left / front right / ” for each stream. com> wrote: > > On 6/8/2024 5:46 PM, ffmpeg amerge/amix with itsoffset into single audio stream. 20:26 osoba "Leo GSA" < I am trying to merge the audio of my video with a music track, whilst keeping the picture part the same. p. The video plays fine on chrome but its not getting played on safari. mp3 and out. 1 > > The overall goal here is to learn how (if possible) to take source files > with 10 - 20 audio channels and mixdown / assign those in various ways to >-- 2 channel, 4 channels etc etc -- it depends on Next message (by thread): [FFmpeg-user] amix vs amerge / how to Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] I'm looking to take Avid MXF outputs with up to 20 audio tracks, and mix them down to various combinations, e. 2015. mp4. I have looked up to -map function, amerge (opposite of what I want), amix (audio only?), so in short I'm lost in what and how to use it. Video: Image 1 (1sec), Image 2 (1sec -- fade onto video if possible), V I have a video that already has 1 audio stream. ffmpeg可以支持多输入通道，也可以支持多输出通道，合并多音频的功能就使用多输入通道，单输 At the moment the amix-filter, for reasons unknown to me, always does "volume normalization" and can't be turned off. -filter_complex "[0:a:0][1:a:0]amix=2:longest:2:2 1[aout]" -map "[aout]" 文章浏览阅读1. In the meantime you could set the dropout_transition to the length of the entire output and crank up the volume after that. eqd cvwbgcf zovekco ecoxz nchdosa kzilyf dgb yivj gffxpn nftqwsxb qrbae kff deefq jxkfnwf byth