[FFmpeg-user] Compressing animation - result has washed out colors

[Ron Barnes]

Hi Kieran,

Ok I did as you asked and I observed three things...

1)  The output from your command below plays flawlessly across the network and looks exactly as the original does on every TV in the house.  When I say it plays flawlessly, I mean there is no buffering, no pixelization, no stutter nothing.  Just crisp clear picture.  Awesome!

2) The original still looks as good as it but now I will never play it again due to the buffering, pixelization and stutter.

3) This difference in file size is less than 1%.  Yours being greater.

Is that what you were looking for?  Should I provide any other information?

-Ron 

-----Original Message-----
From: ffmpeg-user <ffmpeg-user-bounces at ffmpeg.org> On Behalf Of Kieran O Leary
Sent: Thursday, November 22, 2018 6:56 PM
To: FFmpeg user questions <ffmpeg-user at ffmpeg.org>
Subject: Re: [FFmpeg-user] Compressing animation - result has washed out colors

On Thu, 22 Nov 2018, 20:57 Ron Barnes <rbarnes at njdevils.net wrote:

> Hi Kieran,
>
> I think I know what the issue is and I have no idea how to fix it.  
> When I play the movie on my 24 inch Desktop monitor they both look the 
> same.  When I play it on the 65 inch TV the original looks great but 
> the compressed looks washed out.
>

That seems weird.


> Here is what I (Think) figured out.  On my daughters 32 inch TV they 
> both look the same also.  Since the 24 and 32 inch screens seem to 
> show no difference, what that tells me is that maybe when I compressed 
> the movie, it is no longer 4K.  I think.
>

Your file is still 4K from what I can see. Seeing as the ffmpeg terminal outputs and the screenshots look identical in the source and new files, there seems to be something about how your (4k?) 65 inch TV is interpreting the file.
As a long shot, I'd be curious to know if there's some flag in the reencoded h265 bitstream that is in your source file but not in the output,and this is what is triggering the issue.

Can you try the following command and check it on your big TV? The encode should be very quick as the streams are being copied into a new container.


ffmpeg -i "Wreck_It_Ralph_Full_Bluray.mkv" -c copy -map 0 -color_primaries
bt2020 -color_trc smpte2084 -colorspace bt2020nc -color_range tv Wreck-It_Ralph_streamcopy.mkv _______________________________________________
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