Unable to find a suitable output format for ' : Invalid argument

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ffmpeg -i a.webm -i b.webm -filter_complex '[0:v]pad=iw*2:ih[int];[int][1:v]overlay=W/2:0[vid]' -map [vid] -c:v libx264 -crf 23 -preset veryfast outputfin.webm

This was meant to be a simple code to merge two videos side-by-side. However, it is throwing the following error:

'NULL @ 0x55aafb8828e0] Unable to find a suitable output format for '
: Invalid argument

What is the error here?

ffmpeg
1 Answers

3 problems:

  1. Your command works in Linux, but I don't think Windows likes single quotes. Use double quotes.

  2. hstack (or vstack) is much easier then pad + overlay.

  3. Only VP8 or VP9 or AV1 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM. You have two options to fix that:

    • Change output to outputfin.mp4 for H.264 video + AAC audio in MP4.
    • Or remove -c:v libx264 -crf 23 -preset veryfast and it will by default output VP9 video + Opus audio in WebM.

Example:

ffmpeg -i a.webm -i b.webm -filter_complex "[0:v][1:v]hstack" -c:v libx264 -crf 23 -preset veryfast outputfin.mp4
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