[FFmpeg-devel] [PATCH] avcodec: add properties for lossless to AVCodecParameters

[Hendrik Leppkes]

On Mon, May 16, 2016 at 4:43 AM, James Almer <jamrial at gmail.com> wrote:
> On 5/8/2016 12:18 PM, Hendrik Leppkes wrote:
>> On Sun, May 8, 2016 at 12:10 PM, Michael Niedermayer
>> <michael at niedermayer.cc> wrote:
>>> Fixes Ticket5467
>>>
>>> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
>>> ---
>>>  libavcodec/avcodec.h |    4 ++++
>>>  libavcodec/utils.c   |    2 ++
>>>  2 files changed, 6 insertions(+)
>>>
>>> diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
>>> index 3813a0a..1db2e0f 100644
>>> --- a/libavcodec/avcodec.h
>>> +++ b/libavcodec/avcodec.h
>>> @@ -4050,6 +4050,10 @@ typedef struct AVCodecParameters {
>>>       * Audio only. Number of samples to skip after a discontinuity.
>>>       */
>>>      int seek_preroll;
>>> +
>>> +    /** Properties, like FF_CODEC_PROPERTY_LOSSLESS.
>>> +     */
>>> +    int properties;
>>>  } AVCodecParameters;
>>>
>>
>> There properties are not part of any container we support and therefor
>> not really fitting into this structure.
>>
>> - Hendrik
>
> Guess i'm late to the party, but we support the DTS-HD container and it has a
> field that reports if the stream is lossless or not.
> See http://atsc.org/wp-content/uploads/2015/03/Non-Real-Time-Content-Delivery.pdf
> section E.2.8 and table E.12, Bitw_Aupres_Metadata field.
>

DTS-HD has profiles to express this though, it doesn't need such a flag.
And I would argue maybe other codecs should also use profiles to
differentiate different codec modes.

- Hendrik