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• 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()<<"cannot find encoder";
  
      return;
  
  }
  
  qDebug()<<"encoder found";
  
  
  
  context = avcodec_alloc_context3(codec);
  
  if(!context){
  
      qDebug()<<"cannot alloc context";
  
      return;
  
  }
  
  qDebug()<<"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()<<"context init";
  
  
  
  // av_opt_set(context->priv_data, "preset", "slow", 0); // this will crush
  
  AVDictionary *d = NULL;
  
  av_dict_set(&d, "preset", "ultrafast",0); // this won't
  
  
  
  ret = avcodec_open2(context, codec, &d);
  
  if ( ret < 0) {
  
      qDebug()<<"cannot open codec"</ 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 <= 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(&bmpFHeader,szTxt[fileI -1],sizeof(BITMAPFILEHEADER));  
  
  
  
    int nHeadLen = bmpFHeader.bfOffBits - sizeof(BITMAPFILEHEADER);  
  
    memcpy(&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)<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<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(&avpkt);  
  
    avpkt.data = outbuf;  
  
    avpkt.size = outbuf_size;  
  
    u_size = avcodec_encode_video2(c, &avpkt, m_pYUVFrame, &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.

• FFmpeg remux rtp to mpegts [on hold]

  16 décembre 2013, par Ardoramor

  I am trying to remux rtp stream into mptegts format. I have an SDP file with the following contents :

  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=Unnamed
  
  i=N/A
  
  c=IN IP4 192.168.17.44
  
  t=0 0
  
  a=recvonly
  
  a=orient:portrait
  
  m=video 8202 RTP/AVP 96
  
  a=rtpmap:96 H264/90000
  
  a=fmtp:96 packetization-mode=1;profile-level-id=428028;sprop-parameter-sets=Z0KAKJWgKA9E,aM48gA==;
  
  a=control:trackID=1

  I execute the following ffmpeg command :

  ffmpeg -i "test.sdp" -f mpegts -vcodec copy "/tmp/test.ts"

  And I get the following information :

  Input #0, sdp, from 'test.sdp':
  
    Metadata:
  
      title           : Unnamed
  
      comment         : N/A
  
    Duration: N/A, start: 0.066622, bitrate: N/A
  
      Stream #0.0: Video: h264 (Baseline), yuv420p, 640x480, 90k tbr, 90k tbn, 180k tbc
  
  [mpegts @ 0x1101d4c0] muxrate VBR, pcr every 9000 pkts, sdt every 200, pat/pmt every 40 pkts
  
  Output #0, mpegts, to '/tmp/test.ts':
  
    Metadata:
  
      title           : Unnamed
  
      comment         : N/A
  
      encoder         : Lavf53.4.0
  
      Stream #0.0: Video: libx264, yuv420p, 640x480, q=2-31, 90k tbn, 90k tbc
  
  Stream mapping:
  
    Stream #0.0 -> #0.0

  I receive the following error :

  [mpegts @ 0x1c85f960] h264 bitstream malformated, no startcode found, use -vbsf h264_mp4toannexb
  
  av_interleaved_write_frame(): Operation not permitted

  So I add the suggested bitstream filter :

  ffmpeg -i "test.sdp" -f mpegts -vbsf h264_mp4toannexb "/tmp/test.ts"

  But the h264 encoding now becomes h262 (mpeg2video) :

  ~$ffprobe /tmp/test.ts
  
  Input #0, mpegts, from '/tmp/test.ts':
  
    Duration: 00:00:04.13, start: 1.400000, bitrate: 640 kb/s
  
    Program 1
  
      Metadata:
  
        service_name    : Unnamed
  
        service_provider: FFmpeg
  
      Stream #0.0[0x100]: Video: mpeg2video (Main), yuv420p, 640x480 [PAR 1:1 DAR 4:3], 104857 kb/s, 60 fps, 60 tbr, 90k tbn, 120 tbc

  Is there any way to keep the h264 codec without re-encoding it ? Doing so becomes very CPU intensive.

  Update

  Hopefully this will clear up the issue and remove the off-topic stamp.

  I'm writing an Android app that is based off of SpyDroids streaming architecture. The app communicates with the server, providing it the SDP. The server spawns an ffmpeg process to remux the incoming video stream into mpegts and broadcasts it on multicast (right now just file).

  SpyDroid performs streaming by sending recorded mp4 file through localsocket, received h264 packets, supposedly (according to code removed mp4 h264 prefix [annexb]), wraps it with rtp headrs and sends it on its way. Thus, the RPT stream I get is clearly not originally generated as such.

  As @Wagner Patriota has mentioned, I should add '-vcodec copy'. I had run the remuxing with it before as well but the error is still present (full output) :

  ~$ffmpeg -i "test.sdp" -f mpegts -vcodec copy -vbsf h264_mp4toannexb "/tmp/test.ts"
  
  ffmpeg version 0.8.6, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Jan 30 2012 17:17:54 with gcc 4.5.2
  
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-avfilter --enable-pthreads --enable-x11grab --disable-avisynth --enable-libdc1394 --enable-libfaac --enable-libgsm --enable-libmp3lame --enable-libx264 --enable-libxvid --extra-cflags='-O2 -g -m64 -mtune=generic -fPIC' --disable-stripping --disable-demuxer=v4l --disable-demuxer=v4l2 --disable-indev=v4l --disable-indev=v4l2
  
    libavutil    51.  9. 1 / 51.  9. 1
  
    libavcodec   53.  7. 0 / 53.  7. 0
  
    libavformat  53.  4. 0 / 53.  4. 0
  
    libavdevice  53.  1. 1 / 53.  1. 1
  
    libavfilter   2. 23. 0 /  2. 23. 0
  
    libswscale    2.  0. 0 /  2.  0. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  [h264 @ 0x16b4b1c0] concealing 232 DC, 232 AC, 232 MV errors
  
  [h264 @ 0x16b4b1c0] concealing 63 DC, 63 AC, 63 MV errors
  
  [h264 @ 0x16b4b1c0] concealing 25 DC, 25 AC, 25 MV errors
  
  [h264 @ 0x16b4b1c0] concealing 138 DC, 138 AC, 138 MV errors
  
  [h264 @ 0x16b4b1c0] concealing 69 DC, 69 AC, 69 MV errors
  
  [sdp @ 0x16b43400] Estimating duration from bitrate, this may be inaccurate
  
  
  
  Seems stream 0 codec frame rate differs from container frame rate: 180000.00 (180000/1) -> 90000.00 (180000/2)
  
  Input #0, sdp, from 'test.sdp':
  
    Metadata:
  
      title           : Unnamed
  
      comment         : N/A
  
    Duration: N/A, start: 0.033256, bitrate: N/A
  
      Stream #0.0: Video: h264 (Baseline), yuv420p, 640x480, 90k tbr, 90k tbn, 180k tbc
  
  [mpegts @ 0x16b4a4c0] muxrate VBR, pcr every 9000 pkts, sdt every 200, pat/pmt every 40 pkts
  
  Output #0, mpegts, to '/tmp/test.ts':
  
    Metadata:
  
      title           : Unnamed
  
      comment         : N/A
  
      encoder         : Lavf53.4.0
  
      Stream #0.0: Video: libx264, yuv420p, 640x480, q=2-31, 90k tbn, 90k tbc
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press [q] to stop, [?] for help
  
  h264_mp4toannexb failed for stream 0, codec copy: Invalid argument
  
  [mpegts @ 0x16b4a4c0] h264 bitstream malformated, no startcode found, use -vbsf h264_mp4toannexb
  
  av_interleaved_write_frame(): Operation not permitted

  The error reports that the invalid argument has been supplied. Increased loglevel does not give any more information. I know that ffmpeg is sometimes finicky with argument order. However, they seen to be in order of documentation as well as suggested order by @Wagner Patriota.