Hi Jason On Wed, Dec 31, 2025 at 02:08:12PM +0100, Jason A. Donenfeld via ffmpeg-devel wrote: > Currently if you encode a large wav, ffmpeg will hint after the fact > that the resultant file is corrupted, because traditional wav cannot > handle lengths greater than 32-bits. This isn't very useful; nobody > benefits from getting garbage files. > > You can manually work around this by adding `-rf64 always`, which most > players have support for. Most people don't remember to do this until > after the fact when their file is corrupted, or they don't figure it out > at all and wind up using the w64 container instead. > > And so that's what `-rf64 auto` is for. It uses the larger format when > needed, and if not, uses the traditional wav that is probably more > compatible. The result of using `-rf64 auto` is that you can add it to > every command line -- and should add it to every command line -- to get > either a normal small file, or a non-corrupt large file. > > This is a very sensible default to have on, rather than just producing > corrupt files and having users scrambling for solutions, and then having > to do a potentially expensive reencode after. With `-rf64 auto` on by > default, the user always gets a readable good file. And for users who > sometimes want corrupt files, there still exists `-rf64 never` that can > be enabled. > > The fate changes needed to be regenerated, though, because this does > change the size of the normal non 64-bit RIFF header, because the `-rf64 > auto` code path still makes room for it, even if it doesn't wind up > being used. Though some old buggy players relied on having fixed 44-byte > RIFF headers, those old buggy players actually haven't worked with > ffmpeg's wav files for a long time anyway, even in `-rf64 no` mode, > because ffmpeg adds the ISFT filed for the libavformat version. So this > patch shouldn't make any difference in terms of current compatibility.
still breaks some fate tests: make fate-fifo-muxer-wav TEST fifo-muxer-wav --- - 2026-01-03 01:08:49.377174061 +0100 +++ tests/data/fate/fifo-muxer-wav 2026-01-03 01:08:49.371683543 +0100 @@ -1 +1 @@ -4dda5dcc7ecdc2218b0739a152ada802 +c9a1921dfda2531b52b48f268936e0d7 Test fifo-muxer-wav failed. Look at tests/data/fate/fifo-muxer-wav.err for details. make: *** [tests/Makefile:323: fate-fifo-muxer-wav] Error 1 [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Republics decline into democracies and democracies degenerate into despotisms. -- Aristotle
signature.asc
Description: PGP signature
_______________________________________________ ffmpeg-devel mailing list -- [email protected] To unsubscribe send an email to [email protected]
