FFMPEG多路视频和音频(从另一个视频) - 映射问题 [英] FFMPEG mux video and audio (from another video) - mapping issue

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问题描述

我想向从视频到另一个视频中的音频没有音频(在一个命令):

I would like to place the audio from a video to another video without an audio (in one command):

ffmpeg.exe -i video1_noAudio.mov -i video2_wAudio.mov -vcodec copy -acodec copy video1_audioFromVideo2.mov

我猜-Map是做了正确的方式,但我得到了它混淆。

I guess "-map" is the correct way to do it but I got confused with it.

您可以建议如何解决?

推荐答案

input_0.mp4 具有所需的视频流和 input_1.mp4 具有所需的音频流:

Overview of inputs

input_0.mp4 has the desired video stream and input_1.mp4 has the desired audio stream:

的ffmpeg 流是这样的:

$ ffmpeg -i input_0.mp4 -i input_1.mp4

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input_0.mp4':
  Duration: 00:01:48.50, start: 0.000000, bitrate: 4144 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 4014 kb/s, SAR 115:87 DAR 1840:783, 23.98 fps, 23.98 tbr, 16k tbn, 47.95 tbc (default)
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 124 kb/s (default)

Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'input_1.mp4':
  Duration: 00:00:30.05, start: 0.000000, bitrate: 1754 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x480 [SAR 8:9 DAR 4:3], 1687 kb/s, 59.94 fps, 59.94 tbr, 60k tbn, 119.88 tbc (default)
    Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 55 kb/s (default)

身份证号码

的ffmpeg 是指输入文件和索引号流。格式为 input_file_id:input_stream_id 。由于的ffmpeg 从0开始计数,流 1:1 是指从 INPUT_1音频。 MP4

ID numbers

ffmpeg refers to input files and streams with index numbers. The format is input_file_id:input_stream_id. Since ffmpeg starts counting from 0, stream 1:1 refers to the audio from input_1.mp4.

这可以流符增强。例如,你可以告诉的ffmpeg 您想从第一个输入的第一个视频流( 0:V:0 ),并从第二输入( 1的第一音频流:一个:0 )。我preFER这种方法,因为它的效率更高。此外,它是不易发生意外映射,因为 1:1 可以指任何类型的流,而 2:ν:3 只是指第三输入文件的第四个视频流。

This can be enhanced with stream specifiers. For example, you can tell ffmpeg that you want the first video stream from the first input (0:v:0), and the first audio stream from the second input (1:a:0). I prefer this method because it's more efficient. Also, it is less prone to accidental mapping because 1:1 can refer to any type of stream, while 2:v:3 only refers to the fourth video stream of the third input file.

-map 选项指示的ffmpeg 你要什么流。从 input_0.mp4 和音频复制视频 input_1.mp4

The -map option instructs ffmpeg what streams you want. To copy the video from input_0.mp4 and audio from input_1.mp4:

$ ffmpeg -i input_0.mp4 -i input_1.mp4 -c copy -map 0:0 -map 1:1 -shortest out.mp4

这一个例子将做同样的事情:

This next example will do the same thing:

$ ffmpeg -i input_0.mp4 -i input_1.mp4 -c copy -map 0:v:0 -map 1:a:0 -shortest out.mp4


  • 0 -Map:V:0 可译为:从第一输入( 0 ),选择视频流类型( v ),第一视频流( 0

    • -map 0:v:0 can be translated as: from the first input (0), select video stream type (v), first video stream (0)

      -map 1:0 可译为:从第二个输入( 1 ),选择音频流类型( A ),第一音频流( 0

      -map 1:a:0 can be translated as: from the second input (1), select audio stream type (a), first audio stream (0)

      • With -c copy the streams will be stream copied, not re-encoded, so there will be no quality loss. If you want to re-encode, see FFmpeg Wiki: H.264 Encoding Guide.

      -shortest 选项将导致输出持续时间,以匹配最短的输入流的持续时间。

      The -shortest option will cause the output duration to match the duration of the shortest input stream.

      查看 -map 选项文件了解更多信息。

      See the -map option documentation for more info.

      这篇关于FFMPEG多路视频和音频(从另一个视频) - 映射问题的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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