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• Using FFMPEG for online video hosting

  23 août 2021, par Kyle Monti

  I've been looking around for using FFMPEG and PHP. I've noticed you can use FFMPEG with HTML5. I've read the documentation of the FFMPEG's website and it's far beyond my knowledge. I have an open source document of a 'premade' .php file that stores the information to the database and tells it to execute to the ffmpeg function. However, they use mp4box and FLVtool2.

  



  The array's of video size, frame rates, etc. are quite easy to understand. When designing this from scratch I really have not idea where to start.

  



  I've defined the variables that will be recorded once the file is uploaded, thereafter, checking to see if the file exists and recording it the database.

  



  The real question is using mp4box and flvtool2 to convert all videos right to .flv so you can use flowplayer or jwplayer then telling to convert.

  



  EDIT : Sorry to edit, I've seen many posts about the same question but they all relate to old versions of the software, will the php carry over to newer versions (probably could find out on their website if they had a more in depth HOWTO for website streaming)

  


• problem in concatenating mass online video urls using ffmpeg [duplicate]

  25 mai 2021, par JohnTerry

  I want to concat n number of videos together using ffmpeg which can also have more than one codec or different resolutions.
I know how to do it with fixed number of videos but input_videos.txt can contain any unknown number of videos. I checked relative posts but they did not have a solution for my problem.

  


  the command i am using for concatenating videos is -

  


  cmd = "ffmpeg -safe 0 -f concat -protocol_whitelist file,http,https,tcp,tls,crypto -segment_time_metadata 1 -i {} -vf select=concatdec_select,scale=1280:720 -af aselect=concatdec_select,aresample=async=1 -c:v libvpx-vp9 -deadline good -cpu-used 5 -c:a libopus {}".format(input_videos.txt, output_video.webm)


  


  Is there a way to achieve the functionality i want ?

  


• 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 ?