On 05/02/2019 13:27, Carl Eugen Hoyos wrote:
> 2019-01-28 0:47 GMT+01:00, Mark Thompson <s...@jkqxz.net>:
>
>> + if (avctx->color_range == AVCOL_RANGE_MPEG) {
>> + av_log(avctx, AV_LOG_WARNING, "Input video does not appear "
>> + "to use full-range: output colours may be incorrect.\n");
>
> The wording seems not ideal to me:
> Are you not sure if the encoder will produce correct output for
> mpeg-range jpeg?
> That's how it sounds to me...
The problem is that, unlike H.264 and other codecs, JPEG has no way to signal
that the data are actually limited-range. The encode will preserve the values,
but those values will not have the right interpretation at a remote end which
only looks at the JPEG data. On the other hand, if signalled by some
out-of-band method (perhaps the container, or you control both ends) everything
is perfectly usable.
I agree the message isn't particularly clear; do you have any thoughts about
how it should be phrased?
- Mark
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