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Médias (91)
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Richard Stallman et le logiciel libre
19 octobre 2011, par
Mis à jour : Mai 2013
Langue : français
Type : Texte
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Stereo master soundtrack
17 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Audio
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Elephants Dream - Cover of the soundtrack
17 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Image
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#7 Ambience
16 octobre 2011, par
Mis à jour : Juin 2015
Langue : English
Type : Audio
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#6 Teaser Music
16 octobre 2011, par
Mis à jour : Février 2013
Langue : English
Type : Audio
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#5 End Title
16 octobre 2011, par
Mis à jour : Février 2013
Langue : English
Type : Audio
Autres articles (32)
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Organiser par catégorie
17 mai 2013, parDans MédiaSPIP, une rubrique a 2 noms : catégorie et rubrique.
Les différents documents stockés dans MédiaSPIP peuvent être rangés dans différentes catégories. On peut créer une catégorie en cliquant sur "publier une catégorie" dans le menu publier en haut à droite ( après authentification ). Une catégorie peut être rangée dans une autre catégorie aussi ce qui fait qu’on peut construire une arborescence de catégories.
Lors de la publication prochaine d’un document, la nouvelle catégorie créée sera proposée (...) -
Taille des images et des logos définissables
9 février 2011, parDans beaucoup d’endroits du site, logos et images sont redimensionnées pour correspondre aux emplacements définis par les thèmes. L’ensemble des ces tailles pouvant changer d’un thème à un autre peuvent être définies directement dans le thème et éviter ainsi à l’utilisateur de devoir les configurer manuellement après avoir changé l’apparence de son site.
Ces tailles d’images sont également disponibles dans la configuration spécifique de MediaSPIP Core. La taille maximale du logo du site en pixels, on permet (...) -
Configuration spécifique d’Apache
4 février 2011, parModules spécifiques
Pour la configuration d’Apache, il est conseillé d’activer certains modules non spécifiques à MediaSPIP, mais permettant d’améliorer les performances : mod_deflate et mod_headers pour compresser automatiquement via Apache les pages. Cf ce tutoriel ; mode_expires pour gérer correctement l’expiration des hits. Cf ce tutoriel ;
Il est également conseillé d’ajouter la prise en charge par apache du mime-type pour les fichiers WebM comme indiqué dans ce tutoriel.
Création d’un (...)
Sur d’autres sites (5097)
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AV_PIX_FMT_YUVJ422P to jpeg conversion
4 mars 2019, par user3743908i am able to convert image from AV_PIX_FMT_YUVJ422P to jpeg format (below Code) but the resultant image having green shade on complete bottom half plz suggest where i am doing wrong.
Following step i have taken-
Initially i have AV_PIX_FMT_UYVY422 image from camera, i have convert it in AV_PIX_FMT_YUVJ422P format and able to see this image on http://rawpixels.net/ the parameters shown by website is size 2448X2050, Bpp1= 8,Bpp2 = 8 and Bpp3 = 8,alignment 1, SubSampling H =2, and SubSampling V = 1, format : YUV422P
so input image is Correct AV_PIX_FMT_YUVJ422P format. & also able to see on "YUV image viewer Software" using YUV422 format. -
Now i am trying to convert it in jpeg format using below Code and attached is the resultant Image having green shade on complete bottom half.
AVFormatContext* pFormatCtx;
AVOutputFormat* fmt;
AVStream* video_st;
AVCodecContext* pCodecCtx;
AVCodec* pCodec;
uint8_t* picture_buf;
AVFrame* picture;
AVPacket pkt;
int y_size;
int size;
int got_picture=0;
int ret=0;
int main( int argc, char* argv[] )
{
FILE *in_file = NULL;
unsigned int in_width = 2448;
unsigned int in_height = 2050;
const char* out_file = "encoded_pic.jpg";
in_file = fopen("c:\\test_Planar.yuv","rb");
if(in_file == NULL) { printf("\n\tFile Opening error...!!"); exit(1); }
else printf("\n\tYUV File Open Sucessfully...!!\n\n");
av_register_all(); // Loads the whole database of available codecs and formats.
pFormatCtx = avformat_alloc_context();
fmt = NULL;
fmt = av_guess_format("mjpeg",NULL,NULL);
pFormatCtx->oformat = fmt;
//------Output URL-------------------------
if (avio_open(&pFormatCtx->pb,out_file, AVIO_FLAG_READ_WRITE) < 0)
{
printf("Couldn't open output file.");
return -1;
}
video_st = avformat_new_stream(pFormatCtx, 0);
if (video_st==NULL) return -1;
pCodecCtx = video_st->codec;
pCodecCtx->codec_id = fmt->video_codec;
pCodecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
pCodecCtx->pix_fmt = AV_PIX_FMT_YUVJ422P;
//--------------------------MY SOURCE PIXEL FORMAT--------------
pCodecCtx->width = in_width;
pCodecCtx->height = in_height;
pCodecCtx->time_base.num = 1;
pCodecCtx->time_base.den = 1;//25;
//Output some information
av_dump_format(pFormatCtx, 0, out_file, 1);
// Determine if desired video encoder is installed
pCodec = avcodec_find_encoder(pCodecCtx->codec_id);
if (!pCodec)
{
printf("Codec not found.");
return -1;
}
printf("\nCodec Identified done\n");
if (avcodec_open2(pCodecCtx, pCodec,NULL) < 0){
printf("Could not open codec.\n");
return -1;
}
picture = av_frame_alloc();
size = avpicture_get_size(pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height);
picture_buf = (uint8_t *)av_malloc(size);
if (!picture_buf) return -1;
avpicture_fill((AVPicture *)picture, picture_buf, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height);
printf("\t\nWrite Header..");
avformat_write_header(pFormatCtx,NULL);
y_size = pCodecCtx->width * pCodecCtx->height;
av_new_packet(&pkt,y_size*3);
//Read YUV
if (fread(picture_buf, 1, y_size*3/2, in_file) <=0)
{
printf("Could not read input file.");
return -1;
}
//--------------------------------------------input image format UYVY
picture->data[0] = picture_buf; // Y
picture->data[1] = picture_buf+ y_size; // U
picture->data[2] = picture_buf+ y_size*5/4; // V
//-----------------------------------------------
printf("\t\n Encode the image..\n");
ret = avcodec_encode_video2(pCodecCtx, &pkt,picture, &got_picture);
if(ret < 0)
{
printf("Encode Error.\n");
return -1;
}
if (got_picture==1)
{
pkt.stream_index = video_st->index;
ret = av_write_frame(pFormatCtx, &pkt);
}
av_free_packet(&pkt);
//Write Trailer
av_write_trailer(pFormatCtx);
printf("Encode Successful.\n");
if (video_st)
{
avcodec_close(video_st->codec);
av_free(picture);
av_free(picture_buf);
}
avio_close(pFormatCtx->pb);
avformat_free_context(pFormatCtx);
fclose(in_file);
printf("\n\tYUV File Close Sucessfully...!!");
}
Resultant output jpeg encoded image from yuvj422p image having green shade
-
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Packet (AV_PIX_FMT_UYVY422) to Planar (AV_PIX_FMT_YUVJ422P) format conversion
25 août 2017, par user3743908My image format is "YUV422_8_UYVY" which is packed AV_PIX_FMT_UYVY422 format, i am trying to convert it in Planar "AV_PIX_FMT_YUVJ422P", but not able to succeed yet, below is the code on which i am working.
error message : [swscaler @ 004b3fa0] deprecetd pixel format used, make sure you did set range correctly
resultant image (file ) having 0 k size
what would be the last argument of av_image_alloc() for conversion like 16,32 etc
my aim to convert packet yuv image in planar yuv format
static AVCodecContext *pCodecCtx;
static AVFormatContext *pFormatCtx;
static AVCodec *pCodec;
static AVOutputFormat* fmt;
static AVFrame *RawPic;
static AVFrame *ScalePic;
static AVPacket pkt;
static AVStream* video_st;
static FILE *file;
static struct SwsContext *sws_ctx;
enum AVPixelFormat src_pix_fmt = AV_PIX_FMT_UYVY422;
enum AVPixelFormat dst_pix_fmt = AV_PIX_FMT_YUVJ422P;
int main( ) {
FILE *in_file = NULL; //packed Source
FILE *out_file = NULL; //planar output
int in_width = 2448; //YUV's width
int in_height = 2050; //YUV's heigh
int out_width = 2448; //YUV's width
int out_height = 2050; //YUV's heigh
unsigned long int ret;
in_file = fopen("c:\\yuv422_8_uyvy.yuv","rb"); //Source Input File
if(in_file == NULL) { printf("\n\tinput File Opening error...!!"); exit(1); }
out_file = fopen("d:\\test_Planar.yuv", "wb"); //Source Input File
if(out_file == NULL) { printf("\n\toutput File Opening error...!!"); exit(1); }
else { printf("\n\tOutput File Created...!!"); }
//------Loads the whole database of available codecs and formats------
av_register_all();
printf("\t\n\tCodac database Loaded...\n");
//------Contex Variable assignment--------------------------------
pFormatCtx = avformat_alloc_context();
fmt = NULL;
fmt = av_guess_format("mjpeg",NULL,NULL);
pFormatCtx->oformat = fmt;
video_st = avformat_new_stream(pFormatCtx, 0); if (video_st==NULL) return -1;
pCodecCtx = video_st->codec;
pCodecCtx->codec_id = fmt->video_codec;
pCodecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
pCodecCtx->pix_fmt = src_pix_fmt;
printf("\t\n\tContex Variable assigned...\n");
//------Allocate Source Image Buffer--------------------------------
AVFrame *RawPic = av_frame_alloc();
if(!RawPic) { printf("\nCould not allocate Raw Image frame\n"); exit(1);}
RawPic->format = pCodecCtx->pix_fmt;
RawPic->width = in_width;
RawPic->height = in_height;
ret = av_image_alloc(RawPic->data,RawPic->linesize,in_width,in_height,src_pix_fmt, 16);
if(ret < 0) { printf("\nCould not allocate raw picture buffer\n"); exit(1);}
printf("\n\tAllocate Source Image Buffer");
//------Allocate Desitnation Image Buffer-------------------
AVFrame *ScalePic = av_frame_alloc();
if(!ScalePic) { printf("\nCould not allocate Scale Image frame\n"); exit(1);}
ScalePic->format = pCodecCtx->pix_fmt;
ScalePic->width = out_width;
ScalePic->height = out_height;
ret = av_image_alloc(ScalePic->data,ScalePic->linesize,out_width,out_height,dst_pix_fmt, 32);
if(ret < 0) { printf("\nCould not allocate Scale picture buffer\n"); exit(1);}
dst_bufsize = ret;
printf("\n\tAllocate Destination Image Buffer");
//------Create scaling context------------------------------sws_getContex
printf("\t\n\tCreating Scaling context..[sws_getContext]\n");
sws_ctx = sws_getContext( in_width, in_height, src_pix_fmt,
out_width, out_height, dst_pix_fmt,
SWS_BICUBIC, NULL, NULL, NULL);
if(!sws_ctx) { printf("\nContext Error..\n"); }
printf("\t\n\tScaling context...Created\n");
//------Create scaling context---OR CONVERTED TO DESTINATION FORMAT--
sws_scale(sws_ctx, RawPic->data, RawPic->linesize, 0, in_height, ScalePic->data, ScalePic->linesize);
printf("\t\n\tCreating Scaling context...sws_scale...done\n");
int num_bytes = avpicture_get_size(src_pix_fmt,in_width,in_height);
uint8_t* ScalePic_Buffer = (uint8_t *)av_malloc(num_bytes*sizeof(int8_t));
avpicture_fill((AVPicture*)ScalePic,ScalePic_Buffer,AV_PIX_FMT_YUVJ422P,out_width,out_height);
//-----Write Scale Image to outputfile----------------------------
fwrite(ScalePic->data,1,dst_bufsize,out_file);
//---Release all memory and close file----------------------------------
fclose(in_file);
fclose(out_file);
avcodec_close(pCodecCtx);
av_free(pCodecCtx);
av_freep(&RawPic->data[0]);
av_frame_free(&RawPic);
av_freep(&ScalePic->data[0]);
av_frame_free(&ScalePic);
av_frame_free(&RawPic);
printf("\n\n");
system("PAUSE");
exit(1);
} -
swscale/aarch64/output.S : refactor ff_yuv2plane1_8_neon
31 janvier, par Krzysztof Pyrkoszswscale/aarch64/output.S : refactor ff_yuv2plane1_8_neon
The benchmarks (before vs after) were gathered using
./tests/checkasm/checkasm —test=sw_scale —bench —runs=6 | grep yuv2yuv1A78 before :
yuv2yuv1_0_512_accurate_c : 2039.5 ( 1.00x)
yuv2yuv1_0_512_accurate_neon : 385.5 ( 5.29x)
yuv2yuv1_0_512_approximate_c : 2110.5 ( 1.00x)
yuv2yuv1_0_512_approximate_neon : 385.5 ( 5.47x)
yuv2yuv1_3_512_accurate_c : 2061.2 ( 1.00x)
yuv2yuv1_3_512_accurate_neon : 381.2 ( 5.41x)
yuv2yuv1_3_512_approximate_c : 2099.2 ( 1.00x)
yuv2yuv1_3_512_approximate_neon : 381.2 ( 5.51x)
yuv2yuv1_8_512_accurate_c : 2054.2 ( 1.00x)
yuv2yuv1_8_512_accurate_neon : 385.5 ( 5.33x)
yuv2yuv1_8_512_approximate_c : 2112.2 ( 1.00x)
yuv2yuv1_8_512_approximate_neon : 385.5 ( 5.48x)
yuv2yuv1_11_512_accurate_c : 2036.0 ( 1.00x)
yuv2yuv1_11_512_accurate_neon : 381.2 ( 5.34x)
yuv2yuv1_11_512_approximate_c : 2115.0 ( 1.00x)
yuv2yuv1_11_512_approximate_neon : 381.2 ( 5.55x)
yuv2yuv1_16_512_accurate_c : 2066.5 ( 1.00x)
yuv2yuv1_16_512_accurate_neon : 385.5 ( 5.36x)
yuv2yuv1_16_512_approximate_c : 2100.8 ( 1.00x)
yuv2yuv1_16_512_approximate_neon : 385.5 ( 5.45x)
yuv2yuv1_19_512_accurate_c : 2059.8 ( 1.00x)
yuv2yuv1_19_512_accurate_neon : 381.2 ( 5.40x)
yuv2yuv1_19_512_approximate_c : 2102.8 ( 1.00x)
yuv2yuv1_19_512_approximate_neon : 381.2 ( 5.52x)After :
yuv2yuv1_0_512_accurate_c : 2206.0 ( 1.00x)
yuv2yuv1_0_512_accurate_neon : 139.2 (15.84x)
yuv2yuv1_0_512_approximate_c : 2050.0 ( 1.00x)
yuv2yuv1_0_512_approximate_neon : 139.2 (14.72x)
yuv2yuv1_3_512_accurate_c : 2205.2 ( 1.00x)
yuv2yuv1_3_512_accurate_neon : 138.0 (15.98x)
yuv2yuv1_3_512_approximate_c : 2052.5 ( 1.00x)
yuv2yuv1_3_512_approximate_neon : 138.0 (14.87x)
yuv2yuv1_8_512_accurate_c : 2171.0 ( 1.00x)
yuv2yuv1_8_512_accurate_neon : 139.2 (15.59x)
yuv2yuv1_8_512_approximate_c : 2064.2 ( 1.00x)
yuv2yuv1_8_512_approximate_neon : 139.2 (14.82x)
yuv2yuv1_11_512_accurate_c : 2164.8 ( 1.00x)
yuv2yuv1_11_512_accurate_neon : 138.0 (15.69x)
yuv2yuv1_11_512_approximate_c : 2048.8 ( 1.00x)
yuv2yuv1_11_512_approximate_neon : 138.0 (14.85x)
yuv2yuv1_16_512_accurate_c : 2154.5 ( 1.00x)
yuv2yuv1_16_512_accurate_neon : 139.2 (15.47x)
yuv2yuv1_16_512_approximate_c : 2047.2 ( 1.00x)
yuv2yuv1_16_512_approximate_neon : 139.2 (14.70x)
yuv2yuv1_19_512_accurate_c : 2144.5 ( 1.00x)
yuv2yuv1_19_512_accurate_neon : 138.0 (15.54x)
yuv2yuv1_19_512_approximate_c : 2046.0 ( 1.00x)
yuv2yuv1_19_512_approximate_neon : 138.0 (14.83x)A72 before :
yuv2yuv1_0_512_accurate_c : 3779.8 ( 1.00x)
yuv2yuv1_0_512_accurate_neon : 527.8 ( 7.16x)
yuv2yuv1_0_512_approximate_c : 4128.2 ( 1.00x)
yuv2yuv1_0_512_approximate_neon : 528.2 ( 7.81x)
yuv2yuv1_3_512_accurate_c : 3836.2 ( 1.00x)
yuv2yuv1_3_512_accurate_neon : 527.0 ( 7.28x)
yuv2yuv1_3_512_approximate_c : 3991.0 ( 1.00x)
yuv2yuv1_3_512_approximate_neon : 526.8 ( 7.58x)
yuv2yuv1_8_512_accurate_c : 3732.8 ( 1.00x)
yuv2yuv1_8_512_accurate_neon : 525.5 ( 7.10x)
yuv2yuv1_8_512_approximate_c : 4060.0 ( 1.00x)
yuv2yuv1_8_512_approximate_neon : 527.0 ( 7.70x)
yuv2yuv1_11_512_accurate_c : 3836.2 ( 1.00x)
yuv2yuv1_11_512_accurate_neon : 530.0 ( 7.24x)
yuv2yuv1_11_512_approximate_c : 4014.0 ( 1.00x)
yuv2yuv1_11_512_approximate_neon : 530.0 ( 7.57x)
yuv2yuv1_16_512_accurate_c : 3726.2 ( 1.00x)
yuv2yuv1_16_512_accurate_neon : 525.5 ( 7.09x)
yuv2yuv1_16_512_approximate_c : 4114.2 ( 1.00x)
yuv2yuv1_16_512_approximate_neon : 526.2 ( 7.82x)
yuv2yuv1_19_512_accurate_c : 3812.2 ( 1.00x)
yuv2yuv1_19_512_accurate_neon : 530.0 ( 7.19x)
yuv2yuv1_19_512_approximate_c : 4012.2 ( 1.00x)
yuv2yuv1_19_512_approximate_neon : 530.0 ( 7.57x)After :
yuv2yuv1_0_512_accurate_c : 3716.8 ( 1.00x)
yuv2yuv1_0_512_accurate_neon : 215.1 (17.28x)
yuv2yuv1_0_512_approximate_c : 3877.8 ( 1.00x)
yuv2yuv1_0_512_approximate_neon : 222.8 (17.40x)
yuv2yuv1_3_512_accurate_c : 3717.1 ( 1.00x)
yuv2yuv1_3_512_accurate_neon : 217.8 (17.06x)
yuv2yuv1_3_512_approximate_c : 3801.6 ( 1.00x)
yuv2yuv1_3_512_approximate_neon : 220.3 (17.25x)
yuv2yuv1_8_512_accurate_c : 3716.6 ( 1.00x)
yuv2yuv1_8_512_accurate_neon : 213.8 (17.38x)
yuv2yuv1_8_512_approximate_c : 3831.8 ( 1.00x)
yuv2yuv1_8_512_approximate_neon : 218.1 (17.57x)
yuv2yuv1_11_512_accurate_c : 3717.1 ( 1.00x)
yuv2yuv1_11_512_accurate_neon : 219.1 (16.97x)
yuv2yuv1_11_512_approximate_c : 3801.6 ( 1.00x)
yuv2yuv1_11_512_approximate_neon : 216.1 (17.59x)
yuv2yuv1_16_512_accurate_c : 3716.6 ( 1.00x)
yuv2yuv1_16_512_accurate_neon : 213.6 (17.40x)
yuv2yuv1_16_512_approximate_c : 3831.6 ( 1.00x)
yuv2yuv1_16_512_approximate_neon : 215.1 (17.82x)
yuv2yuv1_19_512_accurate_c : 3717.1 ( 1.00x)
yuv2yuv1_19_512_accurate_neon : 223.8 (16.61x)
yuv2yuv1_19_512_approximate_c : 3801.6 ( 1.00x)
yuv2yuv1_19_512_approximate_neon : 219.1 (17.35x)x13s before :
yuv2yuv1_0_512_accurate_c : 1435.1 ( 1.00x)
yuv2yuv1_0_512_accurate_neon : 221.1 ( 6.49x)
yuv2yuv1_0_512_approximate_c : 1405.4 ( 1.00x)
yuv2yuv1_0_512_approximate_neon : 219.1 ( 6.41x)
yuv2yuv1_3_512_accurate_c : 1418.6 ( 1.00x)
yuv2yuv1_3_512_accurate_neon : 215.9 ( 6.57x)
yuv2yuv1_3_512_approximate_c : 1405.9 ( 1.00x)
yuv2yuv1_3_512_approximate_neon : 224.1 ( 6.27x)
yuv2yuv1_8_512_accurate_c : 1433.9 ( 1.00x)
yuv2yuv1_8_512_accurate_neon : 218.6 ( 6.56x)
yuv2yuv1_8_512_approximate_c : 1412.9 ( 1.00x)
yuv2yuv1_8_512_approximate_neon : 218.9 ( 6.46x)
yuv2yuv1_11_512_accurate_c : 1449.1 ( 1.00x)
yuv2yuv1_11_512_accurate_neon : 217.6 ( 6.66x)
yuv2yuv1_11_512_approximate_c : 1410.9 ( 1.00x)
yuv2yuv1_11_512_approximate_neon : 221.1 ( 6.38x)
yuv2yuv1_16_512_accurate_c : 1402.1 ( 1.00x)
yuv2yuv1_16_512_accurate_neon : 214.6 ( 6.53x)
yuv2yuv1_16_512_approximate_c : 1422.4 ( 1.00x)
yuv2yuv1_16_512_approximate_neon : 222.9 ( 6.38x)
yuv2yuv1_19_512_accurate_c : 1421.6 ( 1.00x)
yuv2yuv1_19_512_accurate_neon : 217.4 ( 6.54x)
yuv2yuv1_19_512_approximate_c : 1421.6 ( 1.00x)
yuv2yuv1_19_512_approximate_neon : 221.4 ( 6.42x)After :
yuv2yuv1_0_512_accurate_c : 1413.6 ( 1.00x)
yuv2yuv1_0_512_accurate_neon : 80.6 (17.53x)
yuv2yuv1_0_512_approximate_c : 1455.6 ( 1.00x)
yuv2yuv1_0_512_approximate_neon : 80.6 (18.05x)
yuv2yuv1_3_512_accurate_c : 1429.1 ( 1.00x)
yuv2yuv1_3_512_accurate_neon : 77.4 (18.47x)
yuv2yuv1_3_512_approximate_c : 1462.6 ( 1.00x)
yuv2yuv1_3_512_approximate_neon : 80.6 (18.14x)
yuv2yuv1_8_512_accurate_c : 1425.4 ( 1.00x)
yuv2yuv1_8_512_accurate_neon : 77.9 (18.30x)
yuv2yuv1_8_512_approximate_c : 1436.6 ( 1.00x)
yuv2yuv1_8_512_approximate_neon : 80.9 (17.76x)
yuv2yuv1_11_512_accurate_c : 1429.4 ( 1.00x)
yuv2yuv1_11_512_accurate_neon : 76.1 (18.78x)
yuv2yuv1_11_512_approximate_c : 1447.1 ( 1.00x)
yuv2yuv1_11_512_approximate_neon : 78.4 (18.46x)
yuv2yuv1_16_512_accurate_c : 1439.9 ( 1.00x)
yuv2yuv1_16_512_accurate_neon : 77.6 (18.55x)
yuv2yuv1_16_512_approximate_c : 1422.1 ( 1.00x)
yuv2yuv1_16_512_approximate_neon : 78.1 (18.20x)
yuv2yuv1_19_512_accurate_c : 1447.1 ( 1.00x)
yuv2yuv1_19_512_accurate_neon : 78.1 (18.52x)
yuv2yuv1_19_512_approximate_c : 1474.4 ( 1.00x)
yuv2yuv1_19_512_approximate_neon : 78.1 (18.87x)Signed-off-by : Martin Storsjö <martin@martin.st>
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