Wild Willy
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Yes, MP4 is a video format. But there are also MP4 files that consist of only an audio
track, no video track. You can merge audio-only MP4 with video-only MP4 using the merge
tool within VDH. But it seems you already know about other tools that can do the same
job. There is no need to first convert the audio-only MP4 to any other format. By the
way, audio-only MP4 is equivalent to MP3.
And since you already know about ffmpeg, you could have just downloaded the video track &
the audio track in a single invocation of ffmpeg. You just supply 2 -i input files & a
single output file, which I believe is exactly what you did with the 2 files you had
already downloaded separately. That tells ffmpeg to create the output file from the
video & audio in the input files. The difference is that for what you did, your -i
parameter values were file names on your system. To do it in one step, your -i parameter
values would be URLs.