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Autres articles (59)

Les autorisations surchargées par les plugins

27 avril 2010, par kent1

Mediaspip core
autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs
Publier sur MédiaSpip

13 juin 2013

Puis-je poster des contenus à partir d’une tablette Ipad ?
Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir
Soumettre améliorations et plugins supplémentaires

10 avril 2011

Si vous avez développé une nouvelle extension permettant d’ajouter une ou plusieurs fonctionnalités utiles à MediaSPIP, faites le nous savoir et son intégration dans la distribution officielle sera envisagée.
Vous pouvez utiliser la liste de discussion de développement afin de le faire savoir ou demander de l’aide quant à la réalisation de ce plugin. MediaSPIP étant basé sur SPIP, il est également possible d’utiliser le liste de discussion SPIP-zone de SPIP pour (...)

1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ... | 20

Sur d’autres sites (8498)

Can't open encoder when use libavcodec

1er novembre 2013, par liuyanghejerry

I’m using libavcodec, version 9.7, to write a simple demo, almost exactly like example in official example.

However, I can’t open encoder. Also, av_opt_set(context->priv_data, "preset", "slow", 0) always leads to crush.

This is my code :

// other code...

int ret = 0;

avcodec_register_all();

AVCodec* codec = NULL;

AVCodecContext* context = NULL;

AVFrame* frame = NULL;

uint8_t endcode[] = { 0, 0, 1, 0xb7 };

codec = avcodec_find_encoder(AV_CODEC_ID_H264);

if(!codec){

    qDebug()&lt;&lt;"cannot find encoder";

    return;

}

qDebug()&lt;&lt;"encoder found";



context = avcodec_alloc_context3(codec);

if(!context){

    qDebug()&lt;&lt;"cannot alloc context";

    return;

}

qDebug()&lt;&lt;"context allocted";



context->bit_rate = 400000;

/* resolution must be a multiple of two */

context->width = 352;

context->height = 288;

/* frames per second */

context->time_base= (AVRational){1,25};

context->gop_size = 10; /* emit one intra frame every ten frames */

context->max_b_frames=1;

context->pix_fmt = AV_PIX_FMT_YUV420P;

qDebug()&lt;&lt;"context init";



// av_opt_set(context->priv_data, "preset", "slow", 0); // this will crush

AVDictionary *d = NULL;

av_dict_set(&amp;d, "preset", "ultrafast",0); // this won't



ret = avcodec_open2(context, codec, &amp;d);

if ( ret &lt; 0) {

    qDebug()&lt;&lt;"cannot open codec"&lt;/ other code...

This outputs :

encoder found

context allocted

context init

cannot open codec -22

[libx264 @ 0340B340] [IMGUTILS @ 0028FC34] Picture size 0x10 is invalid

[libx264 @ 0340B340] ignoring invalid width/height values

[libx264 @ 0340B340] Specified pix_fmt is not supported

I don’t think the width/height is invalid and format there either. I have no idea what’s wrong here.

Any help. plz ?

Can't open encoder when use libavcodec

1er novembre 2013, par liuyanghejerry

I'm using libavcodec, version 9.7, to write a simple demo, almost exactly like example in official example.

However, I can't open encoder. Also, av_opt_set(context->priv_data, "preset", "slow", 0) always leads to crush.

This is my code :

// other code...

int ret = 0;

avcodec_register_all();

AVCodec* codec = NULL;

AVCodecContext* context = NULL;

AVFrame* frame = NULL;

uint8_t endcode[] = { 0, 0, 1, 0xb7 };

codec = avcodec_find_encoder(AV_CODEC_ID_H264);

if(!codec){

    qDebug()&lt;&lt;"cannot find encoder";

    return;

}

qDebug()&lt;&lt;"encoder found";



context = avcodec_alloc_context3(codec);

if(!context){

    qDebug()&lt;&lt;"cannot alloc context";

    return;

}

qDebug()&lt;&lt;"context allocted";



context->bit_rate = 400000;

/* resolution must be a multiple of two */

context->width = 352;

context->height = 288;

/* frames per second */

context->time_base= (AVRational){1,25};

context->gop_size = 10; /* emit one intra frame every ten frames */

context->max_b_frames=1;

context->pix_fmt = AV_PIX_FMT_YUV420P;

qDebug()&lt;&lt;"context init";



// av_opt_set(context->priv_data, "preset", "slow", 0); // this will crush

AVDictionary *d = NULL;

av_dict_set(&amp;d, "preset", "ultrafast",0); // this won&#39;t



ret = avcodec_open2(context, codec, &amp;d);

if ( ret &lt; 0) {

    qDebug()&lt;&lt;"cannot open codec"&lt;/ other code...

This outputs :

encoder found

context allocted

context init

cannot open codec -22

[libx264 @ 0340B340] [IMGUTILS @ 0028FC34] Picture size 0x10 is invalid

[libx264 @ 0340B340] ignoring invalid width/height values

[libx264 @ 0340B340] Specified pix_fmt is not supported

I don't think the width/height is invalid and format there either. I have no idea what's wrong here.

Any help. plz ?

Bitmap images to WEBM video encoding

21 novembre 2013, par Ankush

I am trying to encode bitmap images to webm video,but generated video is not playable
Here is code I am using,code works fine for H624.
While encoding console windows shows : [libvpx @ 009b2f60] v1.2.0
there is no webm string in produced video file. Any clue ? ( I am newbie for FFMPEG API )

void create_from_bmp()

{

CFile file[5];  

BYTE *szTxt[5];  



int nWidth = 0;  

int nHeight= 0;  



int nDataLen=0;  



int nLen;  



CString csFileName;  

for (int fileI = 1; fileI &lt;= 5; fileI ++)  

{

  csFileName.Format("e:\\pics\\%d.bmp",fileI);  

  file[fileI - 1].Open(csFileName,CFile::modeRead | CFile::typeBinary);  

  nLen = file[fileI - 1].GetLength();  



  szTxt[fileI -1] = new BYTE[nLen];  

  file[fileI - 1].Read(szTxt[fileI - 1], nLen);  

  file[fileI - 1].Close();  



  //BMP bmi;//BITMAPINFO bmi;  

  //int nHeadLen = sizeof(BMP);  

  BITMAPFILEHEADER bmpFHeader;  

  BITMAPINFOHEADER bmpIHeader;  

  memcpy(&amp;bmpFHeader,szTxt[fileI -1],sizeof(BITMAPFILEHEADER));  



  int nHeadLen = bmpFHeader.bfOffBits - sizeof(BITMAPFILEHEADER);  

  memcpy(&amp;bmpIHeader,szTxt[fileI - 1]+sizeof(BITMAPFILEHEADER),nHeadLen);  



  nWidth = bmpIHeader.biWidth;// 464;// bmi.bmpInfo.bmiHeader.biWidth;// ;  

  nHeight = bmpIHeader.biHeight;//362;// bmi.bmpInfo.bmiHeader.biHeight;// ;  



  szTxt[fileI - 1] += bmpFHeader.bfOffBits;  

  nDataLen = nLen-bmpFHeader.bfOffBits;  

}  



av_register_all();  

avcodec_register_all();  

AVFrame *m_pRGBFrame =  new AVFrame[1];  //RGB    

AVFrame *m_pYUVFrame = new AVFrame[1];;  //YUV

AVCodecContext *c= NULL;  

AVCodecContext *in_c= NULL;  

AVCodec *pCodecH264;

uint8_t * yuv_buff;//  



pCodecH264 = avcodec_find_encoder(CODEC_ID_VP8);  

if(!pCodecH264)  

{  

  fprintf(stderr, "h264 codec not found\n");  

  exit(1);  

}  



c= avcodec_alloc_context3(pCodecH264);  

c->bit_rate = 3000000;// put sample parameters   

c->width =nWidth;//   

c->height = nHeight;//  



// frames per second   

AVRational rate;  

rate.num = 1;  

rate.den = 5;  //5 frames per sec

c->time_base= rate;//(AVRational){1,25};  

c->gop_size = 10; // emit one intra frame every ten frames   //emit one iframe per sec

c->max_b_frames=0;  //

c->thread_count = 1;  

c->pix_fmt = PIX_FMT_YUV420P;//PIX_FMT_RGB24;  

c->codec_id=CODEC_ID_VP8;



//av_opt_set(c->priv_data, /*"preset"*/"libvpx-1080p.ffpreset", /*"slow"*/NULL, 0);  

if(avcodec_open2(c,pCodecH264,NULL)&lt;0)  

  printf("Cant open codec");



int size = c->width * c->height;  



yuv_buff = (uint8_t *) malloc((size * 3) / 2); // size for YUV 420    



uint8_t * rgb_buff = new uint8_t[nDataLen];  



int outbuf_size=400000;  

uint8_t * outbuf= (uint8_t*)malloc(outbuf_size);   

int u_size = 0;  

FILE *f=NULL;   

char * filename = "e:\\pics\\myData.h264";  

f = fopen(filename, "wb");  

if (!f)  

{  

  printf( "could not open %s\n", filename);  

  exit(1);  

}  



//SwsContext  

SwsContext * scxt = sws_getContext(c->width,c->height,PIX_FMT_BGR24,c->width,c->height,PIX_FMT_YUV420P,SWS_POINT,NULL,NULL,NULL);  



AVPacket avpkt;  



//AVFrame *pTFrame=new AVFrame  

for (int i=0;i&lt;60;++i)  

{  

  //AVFrame *m_pYUVFrame = new AVFrame[1];  



  int index = (i / 5) % 5;  

  memcpy(rgb_buff,szTxt[index],nDataLen);  



  avpicture_fill((AVPicture*)m_pRGBFrame, (uint8_t*)rgb_buff, PIX_FMT_RGB24, nWidth, nHeight);  



  avpicture_fill((AVPicture*)m_pYUVFrame, (uint8_t*)yuv_buff, PIX_FMT_YUV420P, nWidth, nHeight);  



  m_pRGBFrame->data[0]  += m_pRGBFrame->linesize[0] * (nHeight - 1);  

  m_pRGBFrame->linesize[0] *= -1;                     

  m_pRGBFrame->data[1]  += m_pRGBFrame->linesize[1] * (nHeight / 2 - 1);  

  m_pRGBFrame->linesize[1] *= -1;  

  m_pRGBFrame->data[2]  += m_pRGBFrame->linesize[2] * (nHeight / 2 - 1);  

  m_pRGBFrame->linesize[2] *= -1;  





  sws_scale(scxt,m_pRGBFrame->data,m_pRGBFrame->linesize,0,c->height,m_pYUVFrame->data,m_pYUVFrame->linesize);  



  int got_packet_ptr = 0;  

  av_init_packet(&amp;avpkt);  

  avpkt.data = outbuf;  

  avpkt.size = outbuf_size;  

  u_size = avcodec_encode_video2(c, &amp;avpkt, m_pYUVFrame, &amp;got_packet_ptr);  

  if (u_size == 0)  

  {  

   fwrite(avpkt.data, 1, avpkt.size, f);  

  }  

} 



fclose(f);   

delete []m_pRGBFrame;  

delete []m_pYUVFrame;  

delete []rgb_buff;  

free(outbuf);  

avcodec_close(c);  

av_free(c);  

}

I want to use this code to record screen by encoding screenshots. what fps,gop size or other parameters i can use to reduce size of video.

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Recherche avancée

Médias (1)

The Great Big Beautiful Tomorrow

Autres articles (59)

Les autorisations surchargées par les plugins

Publier sur MédiaSpip

Soumettre améliorations et plugins supplémentaires

Sur d’autres sites (8498)

Can't open encoder when use libavcodec

Can't open encoder when use libavcodec

Bitmap images to WEBM video encoding

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