ffmpeg copy left audio to right

الحالة::مؤرشفة الرابط: https://superuser.com/a/1592759 المعرفة:: Linux

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Seems like you have a stereo input, but one channel is silent. You can

• Dump the silent channel and make a mono output (recommended method)
• Or copy the same channel to both channels

Mono output from specific channel

Using the pan filter. Example to place the Front Right channel of the stereo input into the mono output:

ffmpeg -i input.mp4 -af "pan=mono|FC=FR" -c:v copy output.mp4

Or use the channelsplit filter:

ffmpeg -i stereo.wav -af "channelsplit=channel_layout=stereo:channels=FR" -c:v copy output.mp4

• The video is stream copied and is therefore untouched.
• See ffmpeg -layouts for accepted layout and channel names.

Copy same channel to both left and right

Using the pan filter. Example to place the Front Left channel of the stereo input into both the Front Left and Front Right channels of the stereo output.

ffmpeg -i input.mp4 -af "pan=stereo|FL=FL|FR=FL" -c:v copy output.mp4

• The video is stream copied and is therefore untouched.
• See ffmpeg -layouts for accepted layout and channel names.

Also see FFmpeg Wiki: Audio Channels.