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Add helpful ffmpeg commands to README

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Signed-off-by: Markus Birth <markus@birth-online.de>
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Markus Birth
2025-12-18 02:30:53 +00:00
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README.md
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@@ -2,3 +2,25 @@ Global Catch Up
===============
Downloader for Global Radio show catch ups. Made during and for their Stranger Things broadcast between 24 Nov and 31 Dec 2025.
Useful Tools
------------
Compare two files ignoring tags (Global embeds different timestamps depending on when a file was (re-)generated. So, the same catch up file can have different timestamps if downloaded at different times.):
ffmpeg -i input.m4a -map_metadata -1 -c copy -f adts pipe:1 | sha256sum -b
Can be strung into a `find` call to calculate checksums of multiple files at once:
find myfolder -type f -iname "*.m4a" -exec sh -c "ffmpeg -i '{}' -map_metadata -1 -c copy -f adts pipe:1 | sha256sum -b" \; 2>/dev/null
Strip metadata:
1. Get `creation_time`:
ffprobe -i input.m4a
2. Remove unwanted metadata and streams (copy the `creation_time` value from above's output):
ffmpeg -i input.m4a -metadata track= -metadata album= -metadata artist= -metadata title= -metadata comment= -metadata creation_time=2025-12-03T11:55:04.000000Z -map 0:0 -c copy -fflags +bitexact -movflags +faststart output.m4a