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• How to get rid of iPhone pointer uint8_t warning ?

  18 décembre 2012, par Winston

  I'm using FFMPeg on my iPhone project, but I'm getting a warning when using AVFrame *pFrame, like this :

  AVFrame *pFrame
  
  uint8_t *data[AV_NUM_DATA_POINTERS];
  
  
  
  ...
  
  
  
  pFrame->data

  This is the warning I'm getting :

  Passing 'uint8_t *[8]' to parameter of type 'const uint8_t *const *' (aka 'const unsigned char *const *') discards qualifiers in nested pointer types

  How do I get rid of this warning ?

  Thank you !

• How to convert rtp codec in online to amr-nb/wb (octet-align = 0) by FFMPEG ?

  28 janvier 2019, par Mehdi Talebi

  rtp is received as input with different payload types such as amr-nb and WAVE.It is necessary to convert all of them to amr-wb but in bandwidth-align (NOT octet-align).
  I use this command to convert :

  ffmpeg -re -i rtp ://127.0.0.1:1235 -ar 16000 -ab 19.85k -acodec libvo_amrbenc -f rtp rtp rtp ://127.0.0.1:1236

  But the out put (SDP) is like this :

  1. v=0
  2. o=- 0 0 IN IP4 127.0.0.1
  3. s=No Name
  4. c=IN IP$ 127.0.0.1
  5. t=0.0
  6. a=tool:libvaformat 58.25.100
  7. m=audio 1236 RTP/AVP 97
  8. b=AS:19
  9. a=rtpmap:97 AMR-WB/16000/1
  10. a=fmtp:97 octet-align =1

  My problem is octet-align =1, i need octet-align = 0. Do you know any argument to set this in the command ?

• How to save AVPacket if I have input information from online camera

  31 mars 2020, par Orest

  I am new to libav.
I have a online video camera and want save video from archive to the video file with libav

  



  Camera provides such data

  



  uint32_t frameType, // I frame or P frame

void *frame, //pointer to the frame

size_t frameSize, //size of the frame in bytes

uint64_t timeStamp, //time stamp in time_t units

uint32_t width, //frame width

uint32_t height, //frame heigh

uint32_t genTime, //I do not now what is this. allways 0

const char *encodingType //H264 or H265


  



  I tried this

  



  void writeHeader(){
mOutputFilePath = outputFilePath;
    int ret = 0;
    avformat_alloc_output_context2(&output_format_context, nullptr, nullptr, outputFilePath.c_str());

AVStream *out_stream;
        out_stream = avformat_new_stream(output_format_context, nullptr);

        out_stream->discard = AVDISCARD_DEFAULT;//не змінювати
        out_stream->codecpar->level = 42;//не змінювати
        out_stream->codecpar->profile = FF_PROFILE_H264_HIGH;//не змінювати
        out_stream->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;

        if(codecID == "H264") out_stream->codecpar->codec_id = AV_CODEC_ID_H264;
        else if(codecID == "H265") out_stream->codecpar->codec_id = AV_CODEC_ID_H265;

        out_stream->codecpar->format = AV_PIX_FMT_YUV420P;
        out_stream->codecpar->height = heightFrame;
        out_stream->codecpar->width = widthFrame;
        //        out_stream->codecpar->bit_rate = 2478235;
        //        out_stream->codecpar->bits_per_coded_sample = 24;
        //        out_stream->codecpar->bits_per_raw_sample = 8;
        out_stream->codecpar->sample_aspect_ratio.num = 0;
        out_stream->codecpar->sample_aspect_ratio.den = 1;
        out_stream->codecpar->color_primaries = AVCOL_PRI_UNSPECIFIED;//не змінювати

avio_open(&output_format_context->pb, mOutputFilePath.c_str(), AVIO_FLAG_WRITE);
avformat_write_header(output_format_context, &opt);
}

void writePacket(){
 AVPacket inputPacket;
        av_init_packet(&inputPacket);
        inputPacket.buf = NULL;
        inputPacket.pts = (int)timeStamp;
        inputPacket.dts = inputPacket.pts; 
        inputPacket.data = (unsigned char*)frame;
        inputPacket.size = (int)frameSize;

        if (frameType == KP2P_FRAME_TYPE_IFRAME)
        {
            inputPacket.flags = AV_PKT_FLAG_KEY;
        }
        inputPacket.duration = 0;
        inputPacket.pos = -1;
av_interleaved_write_frame(output_format_context, &inputPacket);
    av_packet_unref(&inputPacket);
}

void closeFile()
{
av_write_trailer(output_format_context);
    if (output_format_context && !(output_format_context->oformat->flags & AVFMT_NOFILE))
        avio_closep(&output_format_context->pb);
    avformat_free_context(output_format_context);
}


  



  in output file I have black vindow and time is not correct (input 30 seconds in out 2 seconds)
What am I doing wrong ?