[FFmpeg-user] HDR 4K support in ffmpeg

[Andy Furniss]

tarun singhal wrote:

> It seems i have created a confusion here...By "ffmpeg supporting HDR
>  encoding" I meant wether ffmpeg can convert any random video to a
> 4K HDR encoded content. I have already tested 4K and it works fine
> but its this "HDR" piece thats troubling me and I havent even found
> a proper solid source to understand HDR properly. on the top of
> that, how do we get to know whether a content is HDR or SDR, is there
> any tool or a specifc difference between them which can be reported
> by a tool?

I don't know much about this. As has already been said it's all a bit
new standards wise. On the last point, the HDR HEVC demos on

http://www.demo-uhd3d.com

I've "looked at" with ffmpeg do mention smpte2084 which is one standard
(Dolby?)


Some of them seem to have other issues - but then they are experimental
I guess and I don't know whether it's worth reporting them.

ffmpeg -i Exodus_UHD_HDR_Exodus_draft.mp4
ffmpeg version N-77335-g7b88046 Copyright (c) 2000-2015 the FFmpeg 
developers
   built with gcc 4.9.2 (GCC)
   configuration: --prefix=/usr --disable-doc --enable-gpl 
--enable-libvpx --enable-libschroedinger --enable-libx265 
--enable-libdcadec --enable-libmp3lame --enable-libx264
   libavutil      55. 11.100 / 55. 11.100
   libavcodec     57. 18.100 / 57. 18.100
   libavformat    57. 20.100 / 57. 20.100
   libavdevice    57.  0.100 / 57.  0.100
   libavfilter     6. 21.100 /  6. 21.100
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.101 /  2.  0.101
   libpostproc    54.  0.100 / 54.  0.100
[aac @ 0x2515b40] This stream seems to incorrectly report its last 
channel as LFE[3], mapping to LFE[0]
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Exodus_UHD_HDR_Exodus_draft.mp4':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2mp41
     encoder         : Lavf56.15.103
   Duration: 00:00:47.79, start: 0.000000, bitrate: 43159 kb/s
     Stream #0:0(und): Video: hevc (Main 10) (hev1 / 0x31766568), 
yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 3840x2160 [SAR 1:1 DAR 
16:9], 42805 kb/s, 24 fps, 24 tbr, 24k tbn, 23.98 tbc (default)
     Metadata:
       handler_name    : VideoHandler
     Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 
5.1, fltp, 381 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
At least one output file must be specified