FFMPEG多路视频和音频(来自另一个视频) - 映射问题 [英] FFMPEG mux video and audio (from another video) - mapping issue
问题描述
我想将视频中的音频放在没有音频的另一个视频中(在一个命令中):
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
我想-map是正确的方法,但我感到困惑。
I guess "-map" is the correct way to do it but I got confused with it.
你能建议如何解决它吗?
Can you suggest how to resolve it?
推荐答案
输入概述
input_0.mp4
具有所需的视频流,并且 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:
在 ffmpeg
流如下所示:
$ 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)
ID号
ffmpeg
是指具有索引号的输入文件和流。格式为 input_file_id:input_stream_id
。由于 ffmpeg
开始从0开始计数,流 1:1
是指来自 input_1的音频。
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
.
这可以通过流量说明符。例如,您可以从第一个输入( 0:v:0
)中了解您想要的第一个视频流的 ffmpeg
)和来自第二输入( 1:a:0
)的第一个音频流。我更喜欢这种方法,因为它更有效率。另外,由于 1:1
可以引用任何类型的流,而 2:v:3
仅指第三个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 ffmpeg
你想要什么流要从 input_0.mp4
和音频从 input_1.mp4
复制视频:
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
下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
-
-map 0:v:0
可以翻译成:从第一个输入(0
),选择视频流类型(v
),第一个视频流(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:a:0
可以被翻译为:从第二个输入(1
),选择音频流类型(a
) ,第一个音频流(0
)-map 1:a:0
can be translated as: from the second input (1
), select audio stream type (a
), first audio stream (0
)-
使用
-c copy
流将为流复制,不再遭遇ded,所以没有质量损失。如果要重新编码,请参阅 FFmpeg Wiki:H.264编码指南。
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与最短输入流的持续时间相匹配。The
-shortest
option will cause the output duration to match the duration of the shortest input stream.查看
-map
选项文档获取更多信息。See the
-map
option documentation for more info.这篇关于FFMPEG多路视频和音频(来自另一个视频) - 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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