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• html5 video wont play ANY mp4 encodes on ipad

  12 mars 2019, par nickg

  Im trying to embed a mp4 on a page with the HTML5 video tag. Everything works fine on Desktop but nothing will work on an iPad Version 9.3.4.
  I have the mime types in an .htaccess file. I’ve tried various encodes with handbrake, Miro and FFmpeg conversions.

  Even sample videos like at w3schools and videojs don’t play.
  The video will play if i actually sync it to the iPad, but nothing works over the web. An older iPad actually plays mp4s through the HTML5 video player.
  I’m ready to throw this POS iPad through a window.

   <video autoplay="false" width="320" height="240" controls="true">
  
    <source src="http://webnamehere.com/video/bunny.mp4" type="video/mp4; codecs=&quot;avc1.42E01E, mp4a.40.2&quot;">
  
  
  
  Your browser does not support the video tag.
  
  </source></video>

  Has anyone found a way to fix this ? Is there ANY encoding that this thing will actually play ? Thank you in advance for any help.

• FFmpeg.swr_convert : audio to raw 16 bit pcm, to be used with xna SoundEffect. Audio cuts out when i convert

  21 mars 2019, par Robert Russell

  I want to resample mkv(vp8/ogg) and also raw 4 bit adpcm to raw 16bit pcm byte[] to be loaded into SoundEffect from xna library. So I can play it out while I’m using other code to display the frames (the video side is working).
  I can read a 16 bit wav file and play it. But when I goto resample something it doesn’t play 100%. One file is 3 mins and 15 secs. I only get 13 sec and 739 ms before it quits playing. I have been learning to do this by finding code samples in c++ and correcting it to work in c# using ffmpeg.autogen.

  the below is my best attempt at resampling.

              int nb_samples = Frame->nb_samples;
  
                      int output_nb_samples = nb_samples;
  
                      int nb_channels = ffmpeg.av_get_channel_layout_nb_channels(ffmpeg.AV_CH_LAYOUT_STEREO);
  
                      int bytes_per_sample = ffmpeg.av_get_bytes_per_sample(AVSampleFormat.AV_SAMPLE_FMT_S16) * nb_channels;
  
                      int bufsize = ffmpeg.av_samples_get_buffer_size(null, nb_channels, nb_samples,
  
                                                               AVSampleFormat.AV_SAMPLE_FMT_S16, 1);
  
  
  
                      byte*[] b = Frame->data;
  
                      fixed (byte** input = b)
  
                      {
  
                          byte* output = null;
  
                          ffmpeg.av_samples_alloc(&output, null,
  
                              nb_channels,
  
                              nb_samples,
  
                              (AVSampleFormat)Frame->format, 0);//
  
  
  
                          // Buffer input
  
  
  
                          Ret = ffmpeg.swr_convert(Swr, &output, output_nb_samples / 2, input, nb_samples);
  
                          CheckRet();
  
                          WritetoMs(output, 0, Ret * bytes_per_sample);
  
                          output_nb_samples -= Ret;
  
  
  
                          // Drain buffer
  
                          while ((Ret = ffmpeg.swr_convert(Swr, &output, output_nb_samples, null, 0)) > 0)
  
                          {
  
                              CheckRet();
  
                              WritetoMs(output, 0, Ret * bytes_per_sample);
  
                              output_nb_samples -= Ret;
  
                          }
  
                      }

  I changed that all to this but it cuts off sooner.

    Channels = ffmpeg.av_get_channel_layout_nb_channels(OutFrame->channel_layout);
  
                      int nb_channels = ffmpeg.av_get_channel_layout_nb_channels(ffmpeg.AV_CH_LAYOUT_STEREO);
  
                      int bytes_per_sample = ffmpeg.av_get_bytes_per_sample(AVSampleFormat.AV_SAMPLE_FMT_S16) * nb_channels;
  
  
  
                      if((Ret = ffmpeg.swr_convert_frame(Swr, OutFrame, Frame))>=0)
  
                          WritetoMs(*OutFrame->extended_data, 0, OutFrame->nb_samples * bytes_per_sample);
  
                      CheckRet();

  Both code use a function to set Swr it runs one time after the first frame is decoded.

          private void PrepareResampler()
  
      {
  
          ffmpeg.av_frame_copy_props(OutFrame, Frame);
  
          OutFrame->channel_layout = ffmpeg.AV_CH_LAYOUT_STEREO;
  
          OutFrame->format = (int)AVSampleFormat.AV_SAMPLE_FMT_S16;
  
          OutFrame->sample_rate = Frame->sample_rate;
  
          OutFrame->channels = 2;
  
          Swr = ffmpeg.swr_alloc();
  
          if (Swr == null)
  
              throw new Exception("SWR = Null");
  
          Ret = ffmpeg.swr_config_frame(Swr, OutFrame, Frame);
  
          CheckRet();
  
          Ret = ffmpeg.swr_init(Swr);
  
          CheckRet();
  
          Ret = ffmpeg.swr_is_initialized(Swr);
  
          CheckRet();
  
      }

  This is where I take the output and put it in the sound effect

  private void ReadAll()
  
      {
  
  
  
          using (Ms = new MemoryStream())
  
          {
  
              while (true)
  
              {
  
                  Ret = ffmpeg.av_read_frame(Format, Packet);
  
                  if (Ret == ffmpeg.AVERROR_EOF)
  
                      break;
  
                  CheckRet();
  
                  Decode();
  
              }
  
              if (Ms.Length > 0)
  
              {
  
                  se = new SoundEffect(Ms.ToArray(), 0, (int)Ms.Length, OutFrame->sample_rate, (AudioChannels)Channels, 0, 0);
  
                  //se.Duration; Stream->duration;
  
  
  
  
  
                  see = se.CreateInstance();
  
                  see.Play();
  
              } 
  
          }
  
      }

• Decoding YUYV422 raw images using FFmpeg

  12 avril 2019, par user373864q

  I have a collection of sequential YUYV422 raw images that I wish to turn into a video. The problem seems to be that when the frame is created in the avcodec_receive_frame. The frame only contains one channel instead of four in the YUYV format. This results in Input picture width <640> is greater then stride (0) since only the zeroth index of data and linesize is set in the frame. I don’t know if this is a ffmpeg bug or a misconfiguration on my part.

  #include "icsFfmpegImageDecoder.h"
  
  #include <stdexcept>
  
  
  
  ImageDecoder::ImageDecoder(std::string filename)
  
  {
  
      AVInputFormat* iformat;
  
      if (!(iformat = av_find_input_format("image2")))
  
          throw std::invalid_argument(std::string("input Codec not found\n"));
  
  
  
      this->fctx = NULL;
  
      if (avformat_open_input(&amp;this->fctx, filename.c_str(), iformat, NULL) &lt; 0)
  
      {
  
          std::string error = "Failed to open input file ";
  
          error += filename;
  
          error += "\n";
  
          throw std::invalid_argument(error);
  
      }
  
  #ifdef LIB_AVFORMAT_STREAM_CODEC_DEPRECATED
  
      if (!(this->codec = avcodec_find_decoder(this->fctx->streams[0]->codecpar->codec_id)))
  
          throw std::invalid_argument(std::string("Failed to find codec\n"));
  
  
  
      if (!(this->cctx = avcodec_alloc_context3(this->codec)))
  
          throw std::invalid_argument(std::string("could not create image read context codec"));
  
  
  
      if (avcodec_parameters_to_context(this->cctx, this->fctx->streams[0]->codecpar) &lt; 0)
  
          throw std::invalid_argument(std::string("could not get contest codec from stream"));
  
  #else
  
      this->cctx = this->fctx->streams[0]->codec;
  
      if (!(this->codec = avcodec_find_decoder(this->cctx->codec_id)))
  
          throw std::invalid_argument(std::string("Failed to find codec\n"));
  
  #endif
  
  
  
      if (this->cctx->codec_id == AV_CODEC_ID_RAWVIDEO) {
  
          // TODO Make Dynamic
  
          this->cctx->pix_fmt = AV_PIX_FMT_YUYV422 ;
  
          this->cctx->height = 800;
  
          this->cctx->width = 1280;
  
      }
  
  
  
      if (avcodec_open2(this->cctx, this->codec, NULL) &lt; 0)
  
          throw std::invalid_argument(std::string("Failed to open codec\n"));
  
  
  
  #ifdef USING_NEW_AVPACKET_SETUP
  
      if (!(this->pkt = av_packet_alloc()))
  
          throw std::invalid_argument(std::string("Failed to alloc frame\n"));
  
  #else
  
      this->pkt = new AVPacket();
  
      av_init_packet(this->pkt);
  
  #endif
  
      read_file();
  
  }
  
  
  
  ImageDecoder::~ImageDecoder()
  
  {
  
      avcodec_close(this->cctx);
  
      avformat_close_input(&amp;this->fctx);
  
  #ifdef USING_NEW_AVPACKET_SETUP
  
      av_packet_free(&amp;this->pkt);
  
  #else
  
      av_free_packet(this->pkt);
  
      delete this->pkt;
  
  #endif
  
  }
  
  
  
  void ImageDecoder::read_file()
  
  {
  
      if (av_read_frame(this->fctx, this->pkt) &lt; 0)
  
          throw std::invalid_argument(std::string("Failed to read frame from file\n"));
  
  
  
      if (this->pkt->size == 0)   
  
          this->ret = -1;
  
  }
  
  
  
  #ifdef LIB_AVCODEC_USE_SEND_RECEIVE_NOTATION
  
  void ImageDecoder::send_next_packet() {
  
  
  
      if ((this->ret = avcodec_send_packet(this->cctx, this->pkt)) &lt; 0)
  
          throw std::invalid_argument("Error sending a packet for decoding\n");
  
  }
  
  
  
  bool ImageDecoder::receive_next_frame(AVFrame* frame)
  
  {
  
      if (this->ret >= 0)
  
      {
  
          this->ret = avcodec_receive_frame(this->cctx, frame);
  
          if (this->ret == AVERROR_EOF)
  
              return false;
  
          else if (this->ret == AVERROR(11))//11 == EAGAIN builder sucks
  
              return false;
  
          else if (this->ret &lt; 0)
  
              throw std::invalid_argument("Error during decoding\n");
  
          return true;
  
      }
  
      return false;
  
  }
  
  #else
  
  void ImageDecoder::decode_frame(AVFrame* frame)
  
  {
  
      int got_frame = 0;
  
      if (avcodec_decode_video2(this->cctx, frame, &amp;got_frame, this->pkt) &lt; 0) 
  
          throw std::invalid_argument("Error while decoding frame %d\n");
  
  }
  
  #endif
  
  </stdexcept>