[FFmpeg-devel] Re: [PATCH] avformat/wavenc: use RF64 when needed

[Michael Niedermayer via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

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Hi Daniel

On Tue, Dec 30, 2025 at 11:43:17PM -0800, Daniel Verkamp via ffmpeg-devel wrote:
> On Tue, Dec 30, 2025 at 3:17 AM Jason A. Donenfeld <Jason@zx2c4.com> wrote:
[...]
> That said, I think it's fair to say that switching to `-rf64 auto` by
> default won't cause further compatibility problems due to breaking the
> 44-byte header assumption, because current ffmpeg already doesn't
> generate such files (although it did at some point in the distant
> past). WAV files generated by the ffmpeg CLI now have a "ISFT" chunk
> containing the libavformat version, so the header won't be the magic
> 44-byte size regardless of whether the extra reserved-for-ds64 padding
> is added. In other words, any supposed compatibility improvements we'd
> get by trying to stick with the expected "classic" layout were already
> lost when the encoder metadata was added; I should have peeked in a
> hex editor rather than relying on my recollection. :)

Someone should add a classic44_wav mode.
So we cab generate files for these ancient devices that expect that

thx

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

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