壓縮xvid ffmpeg x264 對比

Xvid是基于MPEG4協(xié)議的編解碼器，x264是基于H.264協(xié)議的編碼器，ffmpeg集合了各種音頻，視頻編解碼協(xié)議，通過設(shè)置參數(shù)可以完成基于MPEG4,H.264等協(xié)議的編解碼，現(xiàn)在將其對比結(jié)果羅列如下：

1.軟件版本：
?????? Xvid:1.2.1
?????? x264:無
?????? ffmpeg:0.5


2. 視頻樣本 foreman.cif 300幀，大小352x288

3. 所選用編解碼器：? xvid, x264, ffmpeg

4. 視頻流比特率設(shè)定 : 1000kbps.

5. 測試結(jié)果：
??? ???
?編碼器? 編碼時間(s) 視頻編碼后大小(B) 比特率(kbps) 輸入視頻格式

??? Xvid?????????? 0.98??? ??? 1779213??? ??? 1.18??? ??? yuyv
???
??? X264?????????? 2.2??? ???? 1788824??? ??? 1.19??? ??? yv12

?ffmpeg(mpeg4 協(xié)議) 0.76??? ??? 1754847??? ??? 1.17??? ??? yv12
???
? ffmpeg(h.264協(xié)議) 4.38??? ??? 1741733??? ??? 1.16??? ??? yv12

??? 解碼器??? ? 視頻所用的編碼器??? 解碼時間(ｓ)??? 輸出視頻格式

??? Xvid??? ??? ?????? Xvid??? ??? ???? 0.47??? ??? yuyv
???
??? Xvid ??? ??? ????? ffmpeg ??? ?? ?? 0.50??? ??? yuyv

??? ffmpeg(mpeg4)??? ? Xvid??? ??? ???? 0.26??? ??? yv12

??? ffmpeg(mpeg4)??? ?? ffmpeg(mpeg4)??? 0.31??? ??? yv12

??? ffmpeg(h.264)??? ??? ffmpeg(h.264)??? 0.45??? ??? yv12

??? ffmpeg(h.264)??? ??? X264??? ??? ???? 0.78??? ??? yuyv
???
???

6.結(jié)論

??? 從以上可以看出：

??? 1).??? 對于基于MPEG4協(xié)議的編解碼，ffmpeg的效率都要高于Xvid,主要原因應(yīng)該是Xvid是以保存視頻效果為首要出發(fā)點的，其對視頻質(zhì)量的保存應(yīng)該是做的最好的，這就在一定程度上增加了編解碼的復(fù)雜性，影響了速度的提升。

??? 2). ?? 對于基于H.264協(xié)議的編解碼,由于ffmpeg沒有本身的h.264編碼器，其H.264協(xié)議編碼是調(diào)用x264的編碼庫來完成的，所以其性能本質(zhì)上還是x264的，只不過ffmpeg對其進(jìn)行了封裝，但從數(shù)據(jù)對比可以看出，在本次實驗中，ffmpeg調(diào)用x264庫編碼用了4.38秒，遠(yuǎn)遠(yuǎn)高于 x264的2.2秒，這主要應(yīng)該是ffmpeg調(diào)用x264庫時對其進(jìn)行了不同的參數(shù)設(shè)置，當(dāng)然對x264進(jìn)行接口的封裝也會影響一部分性能，但應(yīng)該不是主要的，主要的應(yīng)該還是調(diào)用x264時，參數(shù)有些不同。

??? 所以如果做基于MPEG4的編解碼，如果對速度要求高的話，ffmpeg是很好用的工具。
??? 對于H.264協(xié)議來說，ffmpeg能很好的解碼，而編碼的話最好還是要調(diào)用x264，因為ffmpeg還沒有實現(xiàn)H.264的編碼。

附：各編解碼器參數(shù)設(shè)定：
?? ?Xvid:?? ??? ?
?? ?xvid_enc_create_obj.version = XVID_VERSION;
??????? xvid_enc_create_obj.max_key_interval = 100;? //must mark it !!
??????? xvid_enc_create_obj.profile = 0xf5;//XVID_PROFILE_S_L0;
??????? xvid_enc_create_obj.fincr = 1;
??????? xvid_enc_create_obj.fbase = 25;??????? //must set for bitrate kxw
??????? xvid_enc_create_obj.num_threads = 0;
??????? xvid_enc_create_obj.global = 0;
??????? xvid_enc_create_obj.plugins = plugins;
??????? xvid_enc_create_obj.num_plugins = 1;
?? ?
??? ??????????? memset(&plugin_single, 0, sizeof(xvid_plugin_single_t));
??????????????? plugin_single.version = XVID_VERSION;
??????????????? plugin_single.bitrate = bitrate * 1024; // 1000*1024
??????????????? plugin_single.reaction_delay_factor = 16;
??????????????? plugin_single.averaging_period = 100;
??????????????? plugin_single.buffer = 100;
??????????????? plugins[0].func = xvid_plugin_single;
??????????????? plugins[0].param = &plugin_single;
???
??? X264:

?param->cpu = X264_CPU_MMXEXT|X264_CPU_SSE|X264_CPU_SSE2;//0x177a;//x264_cpu_detect();
??? param->i_threads = 1;
??? param->b_deterministic = 1;

??? /* Video properties */
??? param->i_csp?????????? = X264_CSP_I420;
??? param->i_width???????? = 0;
??? param->i_height??????? = 0;
??? param->vui.i_sar_width = 0;
??? param->vui.i_sar_height= 0;
??? param->vui.i_overscan? = 0;? /* undef */
??? param->vui.i_vidformat = 5;? /* undef */
??? param->vui.b_fullrange = 0;? /* off */
??? param->vui.i_colorprim = 2;? /* undef */
??? param->vui.i_transfer? = 2;? /* undef */
??? param->vui.i_colmatrix = 2;? /* undef */
??? param->vui.i_chroma_loc= 0;? /* left center */
??? param->i_fps_num?????? = 25;
??? param->i_fps_den?????? = 1;
??? param->i_level_idc???? = -1;

??? /* Encoder parameters */
??? param->i_frame_reference = 1;
??? param->i_keyint_max = 250;
??? param->i_keyint_min = 25;
??? param->i_bframe = 0;??? ??? ??? ??? //ｎｏ　ｂ　ｆｒａｍｅ.
??? param->i_scenecut_threshold = 40;
??? param->i_bframe_adaptive = X264_B_ADAPT_FAST;
??? param->i_bframe_bias = 0;
??? param->b_bframe_pyramid = 0;

??? param->b_deblocking_filter = 1;
??? param->i_deblocking_filter_alphac0 = 0;
??? param->i_deblocking_filter_beta = 0;
??? param->b_cabac = 1;
??? param->i_cabac_init_idc = 0;

??? param->rc.i_rc_method = X264_RC_ABR;?? //kxw notice!
??? param->rc.i_bitrate = 0;
??? param->rc.f_rate_tolerance = 1.0;
??? param->rc.i_vbv_max_bitrate = 0;
??? param->rc.i_vbv_buffer_size = 0;
??? param->rc.f_vbv_buffer_init = 0.9;
??? param->rc.i_qp_constant = 26;??? //??????????? default QP = 26...........kxw mod
??? param->rc.f_rf_constant = 0;
??? param->rc.i_qp_min = 10;
??? param->rc.i_qp_max = 51;
??? param->rc.i_qp_step = 4;
??? param->rc.f_ip_factor = 1.4;
??? param->rc.f_pb_factor = 1.3;
??? param->rc.i_aq_mode = X264_AQ_VARIANCE;
??? param->rc.f_aq_strength = 1.0;
??? param->rc.b_stat_write = 0;
??? //param->rc.psz_stat_out = "x264_2pass.log";
??? param->rc.b_stat_read = 0;
??? //param->rc.psz_stat_in = "x264_2pass.log";
??? param->rc.f_qcompress = 0.6;
??? param->rc.f_qblur = 0.5;
??? param->rc.f_complexity_blur = 20;
??? param->rc.i_zones = 0;

??? /* Log */
??? param->pf_log = NULL;//x264_log_default;//x264_log_default;
??? param->p_log_private = NULL;
??? param->i_log_level = X264_LOG_INFO;
???
??? #if 0??????????????????????????????????????????????? //consume time .kxw mod
??? param->analyse.intra = X264_ANALYSE_I4x4 | X264_ANALYSE_I8x8;
??? param->analyse.inter = X264_ANALYSE_I4x4 | X264_ANALYSE_I8x8
???????????????????????? | X264_ANALYSE_PSUB16x16 | X264_ANALYSE_BSUB16x16;
#endif
??? param->analyse.i_direct_mv_pred = X264_DIRECT_PRED_SPATIAL;
??? param->analyse.i_me_method = X264_ME_HEX;
??? param->analyse.f_psy_rd = 1.0;
??? param->analyse.f_psy_trellis = 0;
??? param->analyse.i_me_range = 16;

#if 0
??? param->analyse.i_subpel_refine = 100;? //consume time so much!! kxw mod
#endif
??? param->analyse.b_chroma_me = 1;

??? param->analyse.i_mv_range_thread = -1;
??? param->analyse.i_mv_range = -1; // set from level_idc

??? param->analyse.i_chroma_qp_offset = 0;
??? param->analyse.b_fast_pskip = 1;
??? param->analyse.b_dct_decimate = 1;

??? param->analyse.i_luma_deadzone[0] = 21;
??? param->analyse.i_luma_deadzone[1] = 11;

??? param->analyse.b_psnr = 1;
??? param->analyse.b_ssim = 1;

??? param->i_cqm_preset = X264_CQM_FLAT;


??? ?x264_param.rc.i_bitrate = br;?? //target bitrate. 1000
??????? x264_param.i_width = width;
??????? x264_param.i_height = height;

ffmpeg:

??? c->bit_rate = 1000000;
??? /* resolution must be a multiple of two */
??? c->width = FRAMEE_WIDTH;
??? c->height = FRAME_HEIGHT;
??? /* frames per second */
??? c->time_base= (AVRational){1,25};
??? c->gop_size = 250; /* emit one intra frame every ten frames */
??? c->max_b_frames=0;
??? c->pix_fmt = PIX_FMT_YUV420P;

X264電影壓縮率畫質(zhì)全對比：http://www.mov8.com/dvd/freetalk_show.asp?id=29778

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