On 2020-08-20 01:47, Paul B Mahol wrote:
On 8/20/20, Michael Koch <astroelectro...@t-online.de> wrote:
Am 20.08.2020 um 10:29 schrieb Paul B Mahol:
On 8/20/20, Michael Koch <astroelectro...@t-online.de> wrote:
…[snip]…
I think ffmpeg doesn't have a DNG decoder. Or it is completely
undocumented.
Searching for "DNG" in ffmpeg-all.html finds nothing.
ffmpeg have DNG decoder.
If you are unsure about something, better keep silence, instead of
spreading incorrect information.
Why is such a useful feature not documented?
Because DNG is not separate decoder but part of TIFF one.
You could search trac tickets or commit logs, DNG was implemented as
part of GSoC.
Another classic FFmpeg project statement. Let's put "search trac tickets
or commit logs" in the FFmpeg documentation hall of fame, along with
"documented implicitly".
Of _course_ FFmpeg supports DNG format. And of _course_ that is not
stated in the mis-named documentation, "ffmpeg-all.html". Nor in the
other documentation, `ffmpeg -formats`. Nor in the other other
documentation, `ffmpeg --help demuxer=tiff_pipe`.
And of _course_ the person who says, with appropriate caution, 'I think
ffmpeg doesn't have a DNG decoder. Or it is completely
undocumented.…' gets spanked for 'spreading incorrect information'.
And of _course_ there is no acknowledgement like, "gosh, FFmpeg
documentation is pretty scattered, not surprising you didn't see this,
if we had better documentation this would be easier".
=====
% ffmpeg -hide_banner -formats
File formats:
D. = Demuxing supported
.E = Muxing supported
--
D 3dostr 3DO STR
…
DE dirac raw Dirac
DE dnxhd raw DNxHD (SMPTE VC-3)
…
D tiertexseq Tiertex Limited SEQ
D tiff_pipe piped tiff sequence
D tmv 8088flex TMV
…
% ffmpeg -hide_banner --help demuxer=tiff_pipe
Demuxer tiff_pipe [piped tiff sequence]:
tiff demuxer AVOptions:
-frame_size <int> .D........ force frame size in bytes (from 0
to INT_MAX) (default 0)
-framerate <video_rate> .D........ set the video framerate (default
"25")
-pixel_format <string> .D........ set video pixel format
-video_size <image_size> .D........ set video size
-loop <boolean> .D........ force loop over input file
sequence (default false)
[Note the absence of any mention of "DNG" in this documentation.]
=====
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