Convert DNG

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Convert DNG

Frei Sibylle Nora
Hello,


I'm working in an Archive where we digitize analog movies. Our master-files are usually DPX but now we get a new scanner which save the movies in DNG files. Is there a possibility to convert de DNG files with FFMPEG to DPX files


I'm looking forward to hear from you


Greetings

Sibille
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Re: Convert DNG

Michael Koch
Am 07.09.2020 um 08:46 schrieb Frei Sibylle Nora:
> Hello,
>
>
> I'm working in an Archive where we digitize analog movies. Our master-files are usually DPX but now we get a new scanner which save the movies in DNG files. Is there a possibility to convert de DNG files with FFMPEG to DPX files

Do you mean CinemaDNG? That's not the same as DNG. DNG is a file format
for RAW still images, while CinemaDNG is for videos.
FFmpeg has an undocumented decoder for DNG images, but it's in an early
experimental state and doesn't work with most images (in fact, I didn't
find any DNG image that could be decoded correctly).
I don't know if FFmpeg has a decoder for CinemaDNG.

Michael

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Re: Convert DNG

Frei Sibylle Nora
Yes i mean CinemaDNG


Thanks for your informations


Sibille


________________________________
Von: ffmpeg-user <[hidden email]> im Auftrag von Michael Koch <[hidden email]>
Gesendet: Montag, 7. September 2020 09:12
An: [hidden email]
Betreff: Re: [FFmpeg-user] Convert DNG

Am 07.09.2020 um 08:46 schrieb Frei Sibylle Nora:
> Hello,
>
>
> I'm working in an Archive where we digitize analog movies. Our master-files are usually DPX but now we get a new scanner which save the movies in DNG files. Is there a possibility to convert de DNG files with FFMPEG to DPX files

Do you mean CinemaDNG? That's not the same as DNG. DNG is a file format
for RAW still images, while CinemaDNG is for videos.
FFmpeg has an undocumented decoder for DNG images, but it's in an early
experimental state and doesn't work with most images (in fact, I didn't
find any DNG image that could be decoded correctly).
I don't know if FFmpeg has a decoder for CinemaDNG.

Michael

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Re: Convert DNG

kumowoon1025
In reply to this post by Michael Koch
Hi,

>> I'm working in an Archive where we digitize analog movies. Our master-files are usually DPX but now we get a new scanner which save the movies in DNG files. Is there a possibility to convert de DNG files with FFMPEG to DPX files
>
> Do you mean CinemaDNG? That's not the same as DNG. DNG is a file format for RAW still images, while CinemaDNG is for videos.

I'm pretty sure CinemaDNG is a series of DNG files with audio, timing metadata, etc.
And both are not open standards, which is somewhat ironic because Adobe developed it as an answer to the plethora of proprietary raw image and film formats.


https://xkcd.com/927 <https://xkcd.com/927>

Regards,
Ted Park

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Re: Convert DNG

Paul B Mahol
In reply to this post by Michael Koch
On Mon, Sep 07, 2020 at 09:12:47AM +0200, Michael Koch wrote:

> Am 07.09.2020 um 08:46 schrieb Frei Sibylle Nora:
> > Hello,
> >
> >
> > I'm working in an Archive where we digitize analog movies. Our master-files are usually DPX but now we get a new scanner which save the movies in DNG files. Is there a possibility to convert de DNG files with FFMPEG to DPX files
>
> Do you mean CinemaDNG? That's not the same as DNG. DNG is a file format for
> RAW still images, while CinemaDNG is for videos.
> FFmpeg has an undocumented decoder for DNG images, but it's in an early
> experimental state and doesn't work with most images (in fact, I didn't find
> any DNG image that could be decoded correctly).

Again spreading misinformation, this needs to stop.

I kindly ask people who do not want good to this project,
to just unsubsribe from the list.

> I don't know if FFmpeg has a decoder for CinemaDNG.
>
> Michael
>
> _______________________________________________
> ffmpeg-user mailing list
> [hidden email]
> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> [hidden email] with subject "unsubscribe".
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Re: Convert DNG

Michael Koch
Am 07.09.2020 um 10:41 schrieb Paul B Mahol:

> On Mon, Sep 07, 2020 at 09:12:47AM +0200, Michael Koch wrote:
>> Am 07.09.2020 um 08:46 schrieb Frei Sibylle Nora:
>>> Hello,
>>>
>>>
>>> I'm working in an Archive where we digitize analog movies. Our master-files are usually DPX but now we get a new scanner which save the movies in DNG files. Is there a possibility to convert de DNG files with FFMPEG to DPX files
>> Do you mean CinemaDNG? That's not the same as DNG. DNG is a file format for
>> RAW still images, while CinemaDNG is for videos.
>> FFmpeg has an undocumented decoder for DNG images, but it's in an early
>> experimental state and doesn't work with most images (in fact, I didn't find
>> any DNG image that could be decoded correctly).
> Again spreading misinformation, this needs to stop.
>
> I kindly ask people who do not want good to this project,
> to just unsubsribe from the list.

What's wrong in my answer?

Michael
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Re: Convert DNG

Carl Zwanzig
On 9/7/2020 1:51 AM, Michael Koch wrote:
>> Again spreading misinformation, this needs to stop.
>>
>> I kindly ask people who do not want good to this project,
>> to just unsubsribe from the list.
>
> What's wrong in my answer?

EXACTLY!!!!!

If something _is_ "misinformation" then correct it! Simply saying "that's
wrong" does nothing to help.

Let's get back to the matter at hand-
The results from searching around for "cinemadng ffmpeg" does suggest that
cinemadng is not fully implemented in ffmpeg. Yes? No? What are the limits?


z!
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Re: Convert DNG

kumowoon1025
In reply to this post by Frei Sibylle Nora

Hi,

> Let's get back to the matter at hand-
>
> The results from searching around for "cinemadng ffmpeg" does suggest that
>
> cinemadng is not fully implemented in ffmpeg. Yes? No? What are the limits?
I would imagine because the material is often raw sensor data, as in the OP’s case (film scans).

Regards,
Ted
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