Set default QP range to (1, 51) instead of (2, 32). QP = 0 is not well supported currently in libopenh264. If iMaxQp/iMinQp equals 0, the QP range would be changed unexpectedly inside libopenh264 with a warning:
Warning:Change QP Range from(0,51) to (12,42) [1] <https://github.com/cisco/openh264/blob/master/codec/encoder/core/src/encoder_ext.cpp#L375> [2] <https://github.com/cisco/openh264/issues/3259> Signed-off-by: Linjie Fu <linjie...@intel.com> --- libavcodec/libopenh264enc.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/libavcodec/libopenh264enc.c b/libavcodec/libopenh264enc.c index ae6d17c..364926f 100644 --- a/libavcodec/libopenh264enc.c +++ b/libavcodec/libopenh264enc.c @@ -135,6 +135,9 @@ FF_ENABLE_DEPRECATION_WARNINGS param.iTargetBitrate = avctx->bit_rate; param.iMaxBitrate = FFMAX(avctx->rc_max_rate, avctx->bit_rate); param.iRCMode = RC_QUALITY_MODE; + // QP = 0 is not well supported, so default to (1, 51) + param.iMaxQp = avctx->qmax >= 0 ? av_clip(avctx->qmax, 1, 51) : 51; + param.iMinQp = avctx->qmin >= 0 ? av_clip(avctx->qmin, 1, param.iMaxQp) : 1; param.iTemporalLayerNum = 1; param.iSpatialLayerNum = 1; param.bEnableDenoise = 0; @@ -332,6 +335,12 @@ static int svc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, return 0; } +static const AVCodecDefault svc_enc_defaults[] = { + { "qmin", "-1" }, + { "qmax", "-1" }, + { NULL }, +}; + AVCodec ff_libopenh264_encoder = { .name = "libopenh264", .long_name = NULL_IF_CONFIG_SMALL("OpenH264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"), @@ -345,6 +354,7 @@ AVCodec ff_libopenh264_encoder = { .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE }, + .defaults = svc_enc_defaults, .priv_class = &class, .wrapper_name = "libopenh264", }; -- 2.7.4 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
