On Mon, 11 Mar 2024, Anton Khirnov wrote:
Quoting Tobias Rapp (2024-03-11 11:12:38)
On 10/03/2024 23:49, Anton Khirnov wrote:
Quoting James Almer (2024-03-10 23:29:27)
On 3/10/2024 7:24 PM, Anton Khirnov wrote:
Quoting Michael Niedermayer (2024-03-10 20:21:47)
On Sun, Mar 10, 2024 at 07:13:18AM +0100, Anton Khirnov wrote:
Quoting Michael Niedermayer (2024-03-10 04:36:29)
why not automatically choose a supported timebase ?
"[mpeg4 @ 0x55973c869f00] timebase 1/1000000 not supported by MPEG 4 standard, the
maximum admitted value for the timebase denominator is 65535"
Because I don't want ffmpeg CLI to have codec-specific code for a codec
that's been obsolete for 15+ years. One could also potentially do it
inside the encoder itself, but it is nontrivial since the computations
are spread across a number of places in mpeg4videoenc.c and
mpegvideo_enc.c. And again, it seems like a waste of time - there is no
reason to encode mpeg4 today.
This is not mpeg4 specific, its just a new additional case that fails
The case you reported is mpeg4 specific.
./ffmpeg -i mm-small.mpg test.dv
[dvvideo @ 0x7f868800f100] Found no DV profile for 80x60 yuv420p video. Valid
DV profiles are:
There is no mechanism for an encoder to export supported time bases.
Could it be added as an extension to AVProfile, or AVCodec?
The two cases are actually pretty different:
* mpeg4 has a constraint on the range of timebases, and actually does
some perverted computations with the timestamps
* DV just needs your video to be CFR, with a list of supported
framerates; dvenc should probably read AVCodecContext.framerate
instead of time_base
But most importantly, is there an actual current use case for either of
those encoders? They have both been obsolete for close to two decades.
It seems silly to add new API that won't actually be useful to anyone.
Hardware doesn't get outdated as quickly as software. And there are
people that do not switch their full environment to a new codec every
decade just to be "in line".
And your point is...?
I think the point is, that one can't just dismiss that anybody would want
to encode mpeg4 video any longer, even if it is obsolete. I also would
like to keep being able to do that.
That said, I haven't followed the discussion closely enough about what to
do with the time bases.
// Martin
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