[FFmpeg-user] DNG images

[Michael Koch]

Am 11.10.2020 um 20:56 schrieb Paul B Mahol:
> On Sun, Oct 11, 2020 at 07:37:25PM +0200, Michael Koch wrote:
>> I tested all 4 DNG images again with the latest FFmpeg version (Gyan's build
>> from today).
>> I tested with and without zscale filter. All tests failed. When testing with
>> IrfanView, all DNG input images seem to be ok.
>>
> Your issues is that you do not know how to use zscale properly.
>
> DNG decoding is just fine, what is missing is colorspace stuff in swscale,
> for proper display.

Can you please give an example for the correct zscale options?


>> [tiff @ 0000019996d6fe40] non increasing IFD offset
>> [tiff @ 0000019996d6fe40]  is not implemented. Update your FFmpeg version to
>> the newest one from Git. If the problem still occurs, it means that your
>> file has a feature which has not been implemented.
>> [tiff @ 0000019996d6fe40] If you want to help, upload a sample of this file
>> to https://streams.videolan.org/upload/ and contact the ffmpeg-devel mailing
>> list. (ffmpeg-devel at ffmpeg.org)
>> Error while decoding stream #0:0: Invalid data found when processing input
>> Cannot determine format of input stream 0:0 after EOF
>> Error marking filters as finisheda
> As message simple says, if you want to help upload that image that fails to
> decode somewhere and post link to upload here.

The link was already in my last message.
www.astro-electronic.de/Pentax_K5.DNG

Michael