On 08/04/2017 01:51 PM, Mark Thompson wrote:
+ break;
+ case AV_CODEC_ID_H263:
+ qmin = MPEG_CID(H263_MIN_QP);
+ qmax = MPEG_CID(H263_MAX_QP);
+ break;
+ case AV_CODEC_ID_VP8:
+ case AV_CODEC_ID_VP9:
+ qmin = MPEG_CID(VPX_MIN_QP);
+ qmax = MPEG_CID(VPX_MAX_QP);
+ break;
+ default:
+ return 0;
+ }
+
+ SET_V4L_EXT_CTRL(value, qmin, avctx->qmin, "minimum video quantizer
scale");
+ SET_V4L_EXT_CTRL(value, qmax, avctx->qmax, "maximum video quantizer
scale");
The default values of qmin/qmax in options_table.h are set for the MPEG-4 part
2 encoder, and will do nasty things to others. (Certainly for VP9 (assuming it
maps to qindex) it's a very low value, so it probably won't ever get anywhere
near the bitrate target for normal video. H.26[45] and VP8 also, but to a
lesser degree.)
would you know where can I get this information from (qmin/qmx for the
other encoders)?
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