[FFmpeg-user] BT.709 -color_primaries -color_trc -colorspace ?

Paul B Mahol onemda at gmail.com
Mon Mar 30 11:46:08 EEST 2020


On 3/30/20, Mark Filipak <markfilipak.windows+ffmpeg at gmail.com> wrote:
> "Lions!" "And tigers!" "And bears!" "Oh, My!" -- The Wizard of Oz.
>

Please spare us from more such pointless threads.

Thanks!

> I did search for answers, but this subject is apparently too esoteric.
>
> 1, Do I need to explicitly specify BT.709 for an encoder or does ffmpeg
> default to it?
>
> 2, Should I specify '-color_primaries' or '-color_trc' or '-colorspace'?
>
> Codec documentation (https://ffmpeg.org/ffmpeg-codecs.html) references to
> 'bt709' [1]
> -color_primaries 0
> -color_trc 0
> -colorspace 1
> [1] The integers I use assume that the documentation lists are ascending
> from zero.
>
> Aside from the integer assigned, what's the difference between the
> '-color_primaries' & '-color_trc'
> & '-colorspace' directives?
>
> As you can see below, the transcode 'Output' status doesn't say what it
> defaults to.
>
> Thanks,
> Mark.
>
>
> Input #0, mpegts, from 'IN.M2TS':
>    Duration: 00:51:03.85, start: 600.000000, bitrate: 29370 kb/s
>    Program 1
>      Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448),
> yuv420p(tv, bt709, progressive),
> 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
> Output #0, matroska, to 'OUT.MKV':
>    Metadata:
>      encoder         : Lavf58.31.104
>      Stream #0:0: Video: hevc (libx265), yuv420p, 1920x1080 [SAR 1:1 DAR
> 16:9], q=2-31, 59.94 fps,
> 1k tbn, 59.94 tbc
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