Am 20.10.24 um 14:44 schrieb Martijn van Beurden:
Op zo 20 okt 2024 om 03:08 schreef Stefan Oltmanns <stefan-oltma...@gmx.net>:
I'm not sure what else there could be in "STREAMINFO_EXT" except for
total samples and sample rate, but maybe there is some other use for (at
least partially) backward-compatible flac extensions.
Adding that to ffmpeg would also be rather simple.
As with any such change, it will take a lot of time to bring all
applications up to date. As you say, a lot of applications use
ffmpeg/libavcodec instead.
Why would that take time? As soon as there is the new libFLAC /
libavcodec in the system applications would be good, don't even require
recompiling (as long as the library version remains the same). For my
testing I did not change the flac application at all, just libFLAC.
(of course applications that ship their own libFLAC/libavcodec would
have to update those)
A much easier solution, which works with ffmpeg right out of the box,
even with older distributions (such as Ubuntu 22.04 you mention) is to
use the wavpack codec instead of flac. It supports samplerates up to 1
GHz, has an arguably better way of seeking, supports a 40 bit number
for samples and has a non-perceptual lossy option which might actually
work very well for your usecase.
There is a massive downside to wavpack: Even in fastest mode I could
find (wavpack -f -x0) it is three times slower than "flac -1", making
real-time encoding difficult.
For decoding it's the same: takes three times longer.
Additionally for FLAC there is a chance of GPU-assisted real-time
high-compression encoding with flaccl (unfortunately that is written in
C# as part of a larger tool set and needs porting to C for general
usability)
A lot of editing applications supporting FLAC also support Wavpack,
often through ffmpeg. The only downsides are that the 40 bit sample
number seems a hard limit and decoding is a bit slower. The 40-bit
number still correlates to 7.5 hours at 40MHz though.
That could be a real issue, VHS recordings in LP (PAL) or SLP (NTSC)
mode can exceed 10 hours
Best regards
Stefan
_______________________________________________
flac-dev mailing list
flac-dev@xiph.org
http://lists.xiph.org/mailman/listinfo/flac-dev
