View Bug Details

IDProjectCategoryView StatusLast Update
0001103DCP-o-matic[All Projects] Featurespublic2018-10-23 11:26
ReportercarlAssigned To 
PrioritynormalSeverityminorReproducibilityN/A
Status acknowledgedResolutionopen 
Product Version 
Target Version2.13.xFixed in Version 
Summary0001103: Export options
Description

Output image size, frame rate (including interlaced).

TagsNo tags attached.
Estimated work requiredUnknown

Relationships

related to 0001146 closedcarl Export multiple reels to separate files 
related to 0001075 closedcarl Stereo mixdown option in export 
related to 0001331 new Option to create custom export templates 
related to 0001332 resolvedcarl Export 3D DCPS to separate L/R files 

Activities

carl

2017-08-21 00:11

administrator   ~0001773

What does "framerate" mean here? An arbitrary export framerate different from what the DCP was specified as?

Carsten

2017-08-21 11:36

manager   ~0001774

Just my opinion - the export function is a functional side track in DOM. Adding every imaginable option to the export means much work. I think it is completely okay if DOM offers only two options - a 'low quality' (screener), and a high quality (re-use), plus optional audio mixdown. Everything else can be created by other tools with a more dedicated feature set (e.g. handbrake).

  • Carsten

Cantar4

2017-08-23 20:43

reporter   ~0001775

100% w/Carsten,
we could even abandon the .mov conversion (which btw still doesn’t work on MacOs 10.12.5 & 2.11.19)
in favor of mp4 (which works, including soft-subtitles size and position), and is half as heavy for about the same image
quality. Remember that the main purpose of the DCP to MP4 conversion is to let people perform
fast-forward film previews.

Carsten

2017-08-24 11:33

manager   ~0001776

I think it is necessary to have a high quality 'reuse' export option, which the MOV option using ProRes is currently targeting. Some people would say uncompressed/lossless image series would be more appropriate.

I noticed that the MP4 export creates unusually high bit rates, some of my lighter machines can not play without frame losses. I guess it makes sense to lower the bitrate for MP4 (or, sigh, make it selectable (low/mid/high), thus making a higher quality ProRes more useful for those who need it.

  • Carsten

Cantar4

2017-08-25 08:56

reporter   ~0001780

Everything else can be created by other tools with a more dedicated feature set (e.g. handbrake).

Hi Carsten, don’t bet on Handbrake for DCP to MP4 conversion. Last year I tried (and failed) to convince its stubborn developer team.
Being stuck to Libav*, they are still unable to convert XYZ to rgb/yuv color space, something that FFmpeg offered to DoM
and the world for years.
--jp

  • weird result of the 2011 FFmpeg internal war and split.

Carsten

2017-08-25 09:31

manager   ~0001782

I don't count on handbrake to convert from DCP, but to all the other formats mentioned above FROM the exports DOMs creates, so, either from MP4 or Prores.

  • Carsten

tomashnyk@gmail.com

2018-10-23 11:26

reporter   ~0002733

I think also the option -preset needs to be able to be selected. When I used CRF 17, I got a 100 GB file, which I was able to convert to about 12GB without any perceptible loss in quality.

In the future, exporting to HEVC (x265) might become useful, though it is fairly slow on my computer.

Also, what are the settings for audio? VBR or CBR? What encoder DOM uses, libfdk_aac or aac?

Bug History

Date Modified Username Field Change
2017-07-24 09:33 carl New Bug
2017-07-24 14:49 carl Relationship added related to 0001075
2017-08-15 22:11 carl Target Version => 2.12.0
2017-08-21 00:10 carl Status new => acknowledged
2017-08-21 00:10 carl Target Version 2.12.0 => 2.13.x
2017-08-21 00:11 carl Note Added: 0001773
2017-08-21 11:36 Carsten Note Added: 0001774
2017-08-23 20:43 Cantar4 Note Added: 0001775
2017-08-24 11:33 Carsten Note Added: 0001776
2017-08-25 08:56 Cantar4 Note Added: 0001780
2017-08-25 09:31 Carsten Note Added: 0001782
2018-06-09 23:41 carl Relationship added related to 0001146
2018-06-28 22:53 carl Relationship added related to 0001331
2018-06-28 22:53 carl Relationship added related to 0001332
2018-10-23 11:26 tomashnyk@gmail.com Note Added: 0002733