ffmpeg avfilter map解释
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
I guess "-map" is the correct way to do it but I got confused with it.
Can you suggest how to resolve it?
Overview of inputs
input_0.mp4 has the desired video stream and input_1.mp4 has the desired audio stream:
In ffmpeg the streams look like this:
$ 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 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.
Stream specifiers
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.
Examples
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
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
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-map 0:v:0 can be translated as: from the first input (0), select video stream type (v), first video stream (0)
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-map 1:a:0 can be translated as: from the second input (1), select audio stream type (a), first audio stream (0)
Additional Notes
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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.
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The -shortest option will cause the output duration to match the duration of the shortest input stream.
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See the -map option documentation for more info.
本文地址:IT屋 » FFMPEG mux video and audio (from another video) - mapping issue
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):
ffmpeg.exe -i video1_noAudio.mov -i video2_wAudio.mov -v codeC副本-a codeC副本video1_audioFromVideo2.mov
我猜“-Map”是做了正确的方式,但我得到了它混淆。
您可以建议如何解决?
输入概述
input_0.mp4 具有所需的视频流和 input_1.mp4 具有所需的音频流:
在的ffmpeg 流是这样的:
$的ffmpeg -i input_0.mp4 -i input_1.mp4输入#0,MOV,MP4,M4A,3GP,3G2,MJ2,从'input_0.mp4“:
时间:00:01:48.50,启动:0.000000,比特率:4144 KB /秒
流#0:0(UND):视频:H264(高)(AVC1 / 0x31637661),YUV420P,1280×720,4014 KB /秒,SAR 115:87 DAR 1840:783,23.98 fps的,23.98 TBR,16K TBN,47.95 TBC (默认)
流#0:1(UND):音频:AAC(LC)(MP4A / 0x6134706D),48000赫兹,立体声,fltp,124 kb / s的(默认)输入#1,MOV,MP4,M4A,3GP,3G2,MJ2,从'input_1.mp4“:
时间:00:00:30.05,启动:0.000000,比特率:1754 KB /秒
流#1:0(UND):视频:H264(高)(AVC1 / 0x31637661),YUV420P,720×480 [SAR 8:9 DAR 4:3] 1687 KB /秒,59.94帧,59.94 TBR,60K TBN,119.88 TBC(默认)
流#1:1(UND):音频:AAC(LC)(MP4A / 0x6134706D),48000赫兹,立体声,fltp,55 KB /秒(默认)
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 。
流符
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。
例子
-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 :
$的ffmpeg -i input_0.mp4 -i input_1.mp4 -c复制-map 0:0 -map 1:1 -shortest out.mp4
这一个例子将做同样的事情:
$的ffmpeg -i input_0.mp4 -i input_1.mp4 -c复制-map 0:V:0 -map 1:0 -shortest out.mp4
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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 )
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-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 )
附加注释
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通过 -c复制流将流复制,不重恩codeD,所以不会有任何质量损失。如果你想重新连接code,见 FFmpeg的维基:H.264编码指南。
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的 -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。
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查看 -map 选项文件了解更多信息。
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