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joshschmelzle/ffmpeg-merge-two-videos.md

Last active December 25, 2022 09:06
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Merging two video clips into one and placing them next to each other with ffmpeg
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ffmpeg-merge-two-videos.md

Taking two video clips, placing them side by side, combining 4 channels of audio into 2, and output.

ffmpeg -i video1.MP4 -i video2.mp4 -filter_complex "[0:v][1:v]hstack=inputs=2[v]; [0:a][1:a]amerge[a]" -map "[v]" -map "[a]" -ac 2 output.mp4

This was done with two filters and the audio from both inputs.

  • hstack places each video side-by-side.
  • amerge combines the audio from both inputs into a single, multi-channel audio stream, and -ac 2 will make it stereo (without this option the audio stream may end up as 4 channels if both inputs are stereo.)
@ucalyptus2
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@joshschmelzle thanks for this, but how to combine videos with different sizes?
I get the error

[Parsed_amerge_2 @ 0x55dd77800820] No channel layout for input 1
[Parsed_amerge_2 @ 0x55dd77800820] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
[Parsed_hstack_0 @ 0x55dd77801860] Input 1 height 1080 does not match input 0 height 270.
[Parsed_hstack_0 @ 0x55dd77801860] Failed to configure output pad on Parsed_hstack_0
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:1
Conversion failed!

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