[FFmpeg-devel] [PATCH] Add DICOM Support

Shivam shivgo at iitk.ac.in
Sun Jun 30 17:04:40 EEST 2019

On 6/29/19 3:35 AM, Michael Niedermayer wrote:
> On Fri, Jun 28, 2019 at 02:02:29PM +0530, Shivam wrote:
>> On 6/27/19 9:21 PM, Michael Niedermayer wrote:
>>> On Wed, Jun 26, 2019 at 11:33:05PM +0530, Shivam wrote:
>>>> On 6/26/19 4:37 PM, Michael Niedermayer wrote:
>>>>> On Wed, Jun 26, 2019 at 09:54:56AM +0200, Paul B Mahol wrote:
>>>>>> On 6/26/19, Michael Niedermayer <michael at niedermayer.cc> wrote:
>>>>>>> On Tue, Jun 25, 2019 at 01:52:09PM +0530, Shivam wrote:
>>>>>>>> On 6/25/19 2:12 AM, Michael Niedermayer wrote:
>>>>>>>>> On Mon, Jun 24, 2019 at 09:18:13PM +0530, Shivam wrote:
>>>>>>>>>> Hi!
>>>>>>>>>>      The code is to add DICOM Support. The patch is only for
>>>>>>>>>> uncompressed
>>>>>>>>>> dicom files using explicit value representation. I would extend it, once
>>>>>>>>>> i
>>>>>>>>>> clarify some doubts.     As dicom image files contain lots of metadata
>>>>>>>>>> about
>>>>>>>>>> the patient. So, should i display that data while demuxing or should i
>>>>>>>>>> ignore and only demux the image data ?. In the current patch, i have
>>>>>>>>>> made an
>>>>>>>>>> option "-metadata", which when used will print the data on the terminal
>>>>>>>>>> while demuxing.
>>>>>>>>> metadata should be exported to be usable by applications.
>>>>>>>>> For teh API design a one test is that it should be possible to have a
>>>>>>>>> dicom file as input and a format with similar features as output and not
>>>>>>>>> loose any significant data.
>>>>>>>>> Printing to the terminal cannot achieve that easily.
>>>>>>>> So, should i export it to a csv file ?
>>>>>>> does it fit into the metadata system we have ?
>>>>>> To clarify, you mean frame metadata system?
>>>>> data that is specific to a frame would belong in the frame metadata
>>>>> data that is specific to a stream would belong into that streams metadata
>>>>> data that is specific to the container would belong to its metadata
>>>>> iam not sure if multiple streams or frames can be in a single dicom
>>>>> "container" / file. If they can then it should be clear what goes where
>>>>> if not then all 3 options would from the point of view of dicom be the
>>>>> same. And in that case what is most convenient for interoperation with
>>>>> other formats should be picked. That is lets introduce the least amount
>>>>> of differences to how similar data is handled in other formats
>>>> Dicom files contain multiple frames, but number of streams is always one
>>>> (video) like GIF,( I haven't done multiframe support yet i am working on it
>>>> ), The data specific to image/frames/pixels can be fit in the three
>>>> categories of our metadata system,
>>>> but their is extradata in DICOM files
>>>> like : patient_name, medical_device_name , medical_procedure_done,
>>>> study_date....
>>> why could this not be fit in metadata ?
>> Yeah this can fit in the key, value pair of our AVDictionaryEntry (and can
>> be written with "-f ffmetadata"). So, should i assign this to streams
>> metadata or containers metadata as this data is not stream specific or
>> container specific ?.
> whatever paul preferrs, if he has an oppinion on it. Otherwise choose
> what feels better to you.


Thank You,

Shivam Goyal

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