[FFmpeg-devel] [PATCHv3 4/4] libavcodec: v4l2: add support for v4l2 mem2mem codecs

[Jorge Ramirez]

On 08/07/2017 11:55 PM, Mark Thompson wrote:
>> would you know where can I get this information from (qmin/qmx for the other encoders)?
>  From the relevant language standards.
>
> H.263 / MPEG-4 part 2:  [1, 31]  (<https://www.itu.int/rec/T-REC-H.263>: PQUANT, GQUANT.)
> H.264 / MPEG-4 part 10 / AVC:  [48 - 6 * bitdepth, 51]  (<https://www.itu.int/rec/T-REC-H.264>: QpBdOffsety, pic_init_qp_minus26, slice_qp_delta.)
> H.265 / MPEG-H part 2 / HEVC:  [48 - 6 * bitdepth, 51]  (<https://www.itu.int/rec/T-REC-H.265>: QpBdOffsety, init_qp_minus26, slice_qp_delta.)
> VP8:  [0, 127]  (<https://tools.ietf.org/html/rfc6386>: q_index.)
> VP9:  [0, 255]  (<https://storage.googleapis.com/downloads.webmproject.org/docs/vp9/vp9-bitstream-specification-v0.6-20160331-draft.pdf>: base_q_idx.)
ah thanks a lot.

btw, how come that that this information is not already present in some 
ffmpeg table?
Just trying to decide if I should just import the relevant data into the 
v4l2_m2m_enc file or somewhere else?