Hello list,
I want to (re-) encode some pictures I decoded with libav. The following code
shows how I do that:
First I decode an h.264 Stream and get pictures in an AVFrame structure. After
doing this I want to encode them into an h.264 stream.
<snip>
bytesDecoded = avcodec_decode_video2(m->videofile->VideoTrack->codec_context,
avframe, &frameFinished, &packet);
if (frameFinished)
{
frameNr++;
if (frameNr >= decodeToFrame)
{
AVCodecContext* c = t->streamContext->codec;
avframe->pts = (frameNr - decodeToFrame)*40*90;
int out_size = avcodec_encode_video(c, video_outbuf,
video_outbuf_size, avframe);
if (out_size > 0)
{
...
}
<snap>
My Encoding parameters for x264 are set in a function like this:
bool h264_initEncoder(AVFormatContext* fc, tavtrack_t* track)
{
AVCodec* codec = NULL;
AVCodecContext* c = NULL;
c = track->streamContext->codec;
c->profile = track->codec_context->profile; // original set by
libavformat/libavcodec
c->level = track->codec_context->level; // original set by
libavformat/libavcodec
// Medium Profile
// libx264-medium.ffpreset preset
c->coder_type = FF_CODER_TYPE_AC; // coder = 1
c->flags |= CODEC_FLAG_LOOP_FILTER; // flags=+loop
c->me_cmp|= 1; // cmp=+chroma,
where CHROMA = 1
c->partitions |=
X264_PART_I8X8+X264_PART_I4X4+X264_PART_P8X8+X264_PART_B8X8;
// partitions=+parti8x8+parti4x4+partp8x8+partb8x8
c->me_method=ME_HEX; // me_method=hex
c->me_subpel_quality = 7; // subq=7
c->me_range = 16; // me_range=16
//c->gop_size = 250; // g=250
//c->keyint_min = 25; // keyint_min=25
c->scenechange_threshold = 40; // sc_threshold=40
//c->i_quant_factor = 0.71; // i_qfactor=0.71
//c->b_frame_strategy = 1; // b_strategy=1
c->qcompress = 0.6; // qcomp=0.6
c->qmin = 10; // qmin=10
c->qmax = 51; // qmax=51
c->max_qdiff = 4; // qdiff=4
c->max_b_frames = 3; // bf=3
c->refs = 3; // refs=3
//c->directpred = 1; // directpred=1
//c->trellis = 1; //
trellis=1
c->flags2 |=
CODEC_FLAG2_BPYRAMID+CODEC_FLAG2_MIXED_REFS+CODEC_FLAG2_WPRED+CODEC_FLAG2_8X8DCT+CODEC_FLAG2_FASTPSKIP;
// flags2=+bpyramid+mixed_refs+wpred+dct8x8+fastpskip
c->weighted_p_pred = 2; // wpredp=2
// libx264-main.ffpreset preset
//c->flags2|=CODEC_FLAG2_8X8DCT;
//c->flags2^=CODEC_FLAG2_8X8DCT; // flags2=-dct8x8
c->crf = 22;
codec = avcodec_find_encoder(c->codec_id);
if (!codec)
return false;
if (avcodec_open(c, codec) < 0)
return false;
return true;
}
The Problem is, that the avcode_encode_video( ... ) works but no frame will be
compressed. I get strange errors like this:
[libx264 @ 0x101003600] specified frame type (5) at 0 is not compatible with
keyframe interval
[libx264 @ 0x101003600] specified frame type (5) at 1 is not compatible with
keyframe interval
[libx264 @ 0x101003600] specified frame type (3) at 2 is not compatible with
keyframe interval
I get no frame. But why? Does anybody has an hint for me? Are my parameters
wrong?
regards,
Sven
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