如何使用ffmpeg从视频文件中删除一条曲目?

问题描述

如何使用ffmpeg从视频文件容器(.vob或.mkv)中仅删除一个曲目(不是全部)?

How to remove only one track (not all) from video file container (.vob or .mkv) using ffmpeg?

我知道我可以将视频(-c:v copy -an)和特定的音轨从容器复制到两个单独的文件中，然后将它们加入.

I know I can just copy video (-c:v copy -an) and specific audio track from container into two separated files and then join them.

但是有更简单的方法吗?我可以从容器中删除特定的音轨吗? ffmpeg命令?

But is there an easier way? Can I just remove specific audio track from container? ffmpeg command?

推荐答案

最有效的方法是使用 -map选项中的否定映射" ，以排除特定的流(轨道")，同时保留所有其他流.

The most efficient method is to use negative mapping in the -map option to exclude specific stream(s) ("tracks") while keeping all other streams.

ffmpeg -i input -map 0 -map -0:a:2 -c copy output

• -map 0从输入中选择所有流.
• -map -0:a:2然后取消选择音频流3.流索引从0开始计数，因此音频流10将为0:a:9.
• -map 0 selects all streams from the input.
• -map -0:a:2 then deselects audio stream 3. The stream index starts counting from 0, so audio stream 10 would be 0:a:9.

ffmpeg -i input -map 0 -map -0:a -c copy output

• -map 0从输入中选择所有流.
• -map -0:a然后从输入中取消选择所有音频流.
• -map 0 selects all streams from the input.
• -map -0:a then deselects all audio streams from the input.

保留除音频流#3和#6以外的所有内容:

Keep everything except audio streams #3 and #6:

ffmpeg -i input -map 0 -map -0:a:3 -map -0:a:6 -c copy output

删除所有字幕和数据

ffmpeg -i input -map 0 -map -0:s -map -0:d -c copy output

仅包含视频和音频

此示例不需要使用任何否定映射.

Only include video and audio

This example does not need to use any negative mapping.

ffmpeg -i input -map 0:v -map 0:a -c copy output

删除其他流/曲目类型

如果您要删除其他流类型，则可以使用相应的流说明符.

• v-视频，例如-map -0:v
• a-音频，例如-map -0:a(如上所示)
• s-字幕，例如-map -0:s
• d-数据，例如-map -0:d
• t-附件，例如-map -0:t
• v - video, such as -map -0:v
• a - audio, such as -map -0:a (as shown above)
• s - subtitles, such as -map -0:s
• d - data, such as -map -0:d
• t - attachments, such as -map -0:t

使用立体声输入和 channelsplit 过滤器.仅获取正确频道并输出单声道音频文件的示例:

Using a stereo input and channelsplit filter. Example to get the right channel only and output a mono audio file:

ffmpeg -i stereo.wav -filter_complex "[0:a]channelsplit=channel_layout=stereo:channels=FR[right]" -map "[right]" front_right.wav

• channel_layout是输入流的通道布局.默认值为stereo.

  • channel_layout is the channel layout of the input stream. The default is stereo.

    channels列出要提取的通道作为单独的输出流.默认值为all，它将每个输入通道提取为单独的单独流.

    channels lists the channels to be extracted as separate output streams. The default is all which extracts each input channel as a separate, individual stream.

    有关可接受的通道布局(用于channel_layout选项)和通道名称(用于channels选项)的列表，请参见ffmpeg -layouts.

    See ffmpeg -layouts for a list of accepted channel layouts (for channel_layout option) and channel names (for channels option).

    有关更多示例，请参见 FFmpeg Wiki:音频通道.

    See FFmpeg Wiki: Audio Channels for more examples.

    • -map选项文档
    • FFmpeg Wiki:地图
    • -map option documentation
    • FFmpeg Wiki: Map

    这篇关于如何使用ffmpeg从视频文件中删除一条曲目?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！