Server: Severe Color Issues with File Consumer and DNxHD

[5opr4ni]

Expected behaviour

If I record a channel I expect the same colour in the recorded file as the channel I record.

Current behaviour

The recorded file is darker than the channel. (looks like 709->RGB)
See screenshots

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Steps to reproduce

1. Play something on the channel
2. ADD 1-3770 FILE AAA_OLLE.mxf -codec:v dnxhd -b:v 120M -flags:v +ilme+ildct -threads:v 4 -filter:v format=yuv422p,interlace
3. Play the recorded file and compare.

Environment

• Commit: 85066b9a4606ed6692cdf3ea7b58e2d86b76ad33
• Server version: c2.2.x
  

  * Operating system: Windows 7

We have checked:

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Screenshots

Original:

Recorded File:

[sirfnomi]

try with adding -filter:v scale=out_color_matrix=bt709

[ronag]

Also see if any of: 10.25-10.27 (https://ffmpeg.org/ffmpeg-filters.html) can help

[5opr4ni]

try with adding -filter:v scale=out_color_matrix=bt709

Sorry, no luck with this! :(

[premultiply]

scale=in_range=full:out_range=tv:out_color_matrix=bt709

[dotarmin]

This is a big issue right now that we will need to fix before we release v2.2.1 or do you think we should wait until v2.2.2?

[5opr4ni]

scale=in_range=full,out_range=tv,out_color_matrix=bt709

ADD 1-3770 FILE AAA_OLLE.mxf -codec:v dnxhd -b:v 120M -flags:v +ilme+ildct -threads:v 4 -filter:v interlace,scale=in_range=full,out_range=tv,out_color_matrix=bt709,format=yuv422p

This is the latest, that fails with this.
No such filter: 'out_range'
No such filter: 'out_color_matrix'

[premultiply]

Then it is : instead of ,
Its a property of the scale filter.
Just have a look at the ffmpeg documentation.

[dotarmin]

From FFmpeg documentation:

out_range
Set in/output YCbCr sample range.

This allows the autodetected value to be overridden as well as allows forcing a specific value used for >the output and encoder. If not specified, the range depends on the pixel format. Possible values:

‘auto/unknown’
Choose automatically.

‘jpeg/full/pc’
Set full range (0-255 in case of 8-bit luma).

‘mpeg/limited/tv’
Set "MPEG" range (16-235 in case of 8-bit luma).

[5opr4ni]

Then it is : instead of ,
Its a property of the scale filter.
Just have a look at the ffmpeg documentation.

Nice work @premultiply this looks promising. I will do some more test. A big thanks to you.
This is the working command so far, just need to verify.

ADD 1-3770 FILE AAA_OLLE.mxf -codec:v dnxhd -b:v 120M -flags:v +ilme+ildct -threads:v 4 -filter:v interlace,scale=in_range=full:out_range=tv:out_color_matrix=bt709,format=yuv422p

Thanks again
/Olle

[5opr4ni]

We should set up a wiki for ffmpeg in casparcg. I have heard this before, but I really want to see this happen.

[ryci-us]

i just want to mention, that ffmpeg by default doesn't set any information about colorspace in it's output.

-filter:v interlace,scale=in_range=full:out_range=tv:out_color_matrix=bt470bg,format=yuv420p
result:
Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc

Set them manually:

-filter:v interlace,scale=in_range=full:out_range=tv:out_color_matrix=bt470bg,format=yuv420p -colorspace:v bt470bg -color_primaries:v bt470bg -color_trc:v gamma28
result:
Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, bt470bg), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc

[premultiply]

Yes, you have to set all metadata and conversion options manually to create proper files with ffmpeg (and CasparCG).
And its best to specify as much as possible properties in scaler options.

[premultiply]

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