我正在使用高分辨率相機:4008x2672。我寫了一個簡單的程序,從相機抓取幀並將幀發送到avi文件。爲了處理如此高的分辨率,我發現只有x264編解碼器可以做到這一點(建議歡迎)。我正在使用opencv處理大部分圖像處理內容。正如在這篇文章http://doom10.org/index.php?topic=1019.0中提到的那樣,我修改了AVCodecContext成員,按照libx264的ffmpeg預設(必須這樣做以避免破壞ffmpeg默認設置錯誤)。這是我得到的輸出,當我嘗試運行程序使用Opencv進行X264編碼
libx264 @ 0x992d040]non-strictly-monotonic PTS
1294846981.526675 1 0 //Timestamp camera_no frame_no
1294846981.621101 1 1
1294846981.715521 1 2
1294846981.809939 1 3
1294846981.904360 1 4
1294846981.998782 1 5
1294846982.093203 1 6
Last message repeated 7 times
[avi @ 0x992beb0]st:0 error, non monotone timestamps
-614891469123651720 >= -614891469123651720
OpenCV Error: Unspecified error (Error while writing video frame) in
icv_av_write_frame_FFMPEG, file
/home/ajoshi/ext/OpenCV-2.2.0/modules/highgui/src/cap_ffmpeg.cpp, line 1034
terminate called after throwing an instance of 'cv::Exception'
what(): /home/ajoshi/ext/OpenCV-2.2.0/modules/highgui/src/cap_ffmpeg.cpp:1034:
error: (-2) Error while writing video frame in function icv_av_write_frame_FFMPEG
中止
修改到AVCodecContext是:
if(codec_id == CODEC_ID_H264)
{
//fprintf(stderr, "Trying to parse a preset file for libx264\n");
//Setting Values manually from medium preset
c->me_method = 7;
c->qcompress=0.6;
c->qmin = 10;
c->qmax = 51;
c->max_qdiff = 4;
c->i_quant_factor=0.71;
c->max_b_frames=3;
c->b_frame_strategy = 1;
c->me_range = 16;<br>
c->me_subpel_quality=7;
c->coder_type = 1;
c->scenechange_threshold=40;
c->partitions = X264_PART_I8X8 | X264_PART_I4X4 | X264_PART_P8X8 | X264_PART_B8X8;
c->flags = CODEC_FLAG_LOOP_FILTER;
c->flags2 = CODEC_FLAG2_BPYRAMID | CODEC_FLAG2_MIXED_REFS | CODEC_FLAG2_WPRED | CODEC_FLAG2_8X8DCT | CODEC_FLAG2_FASTPSKIP;
c->keyint_min = 25;
c->refs = 3;
c->trellis=1;
c->directpred = 1;
c->weighted_p_pred=2;
}
我可能不會設置DTS和PTS值我相信ffmpeg應該爲我設定。
歡迎任何建議。
在此先感謝