[FFmpeg-user] Position of Images and Audio in a Video File

[Mettavihari D]

Greetings,

I have wondered how the Images and the Audio is placed in a Video  File
We speak of them as Tracks but I am trying to learn how it is placed
binarily one after the other.
It is after all just a binary list of numbers or codes.

I download files which are in dash format from Youtube using youtube-dl.
And it appears that the Video is separately downloaded and Audio separately
After that the 2 files are merged together into one file.

I would much appreciate having a pointer in the directions where I
could read more about this.

Regards
Mettavihari


[download] Wi-Fi World Congress Europe Day
1-551888518.fdash-fastly_skyfire_sep-video-59b7287b.mp4 has already
been downloaded
[download] 100% of 884.25MiB
[dashsegments] Total fragments: 1906
[download] Destination: Wi-Fi World Congress Europe Day
1-551888518.fdash-fastly_skyfire_sep-audio-0c5aa284.m4a
[download] 100% of 351.41MiB in 28:00
[ffmpeg] Merging formats into "Wi-Fi World Congress Europe Day 1-551888518.mp4"
Deleting original file Wi-Fi World Congress Europe Day
1-551888518.fdash-fastly_skyfire_sep-video-59b7287b.mp4 (pass -k to
keep)
Deleting original file Wi-Fi World Congress Europe Day
1-551888518.fdash-fastly_skyfire_sep-audio-0c5aa284.m4a (pass -k to
keep)

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