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• Create a slide show from images in a folder [on hold]

  26 juillet 2017, par randommman

  So i have a folder with images like so :

  1.png
  
  2.png
  
  3.png
  
  .. etc

  I am trying to generate a slideshow video from the videos, i have the following code :

          string ffmpegPath = "ffmpeg.exe";
  
          string ffmpegParams = "-y - r " + mimtime + " -i " + Images + "- c:v libx264 -r 15 - pix_fmt yuv420p -vf fps = 90 " + Video;
  
  
  
          Process ffmpeg = new Process();
  
          ffmpeg.StartInfo.FileName = "cmd.exe";
  
          ffmpeg.StartInfo.Arguments = "/k " + ffmpegPath + " " + ffmpegParams;
  
          ffmpeg.Start();

  But this is giving me permision denied, because I think I need to add the individual images. How can I get the individuall images to generate a video ?

• I using ffmpeg to live stream a hd video to rtmp server of facebook but when see it only show 360 quality

  29 octobre 2018, par jack ma

  This is my ffmpeg code :

  'ffmpeg -i "{}"  ' \
  
        '-vf "zoompan=z=\'min(max(zoom,pzoom)+0.0015,2)\':d=1:x=\'iw/2-(iw/zoom/2)\':y=\'ih/2-(ih/zoom/2)\'" ' \
  
        '-vcodec libx264 ' \
  
        '-preset veryfast ' \
  
        '-maxrate 2932k ' \
  
        '-bufsize 2500k ' \
  
        '-vf "format=yuv420p" ' \
  
        '-g 60 ' \
  
        '-acodec libmp3lame ' \
  
        '-b:a 198k ' \
  
        '-ar 44100 ' \
  
        '-s 1280x720 ' \
  
        '-f flv "{}"

  I have wasted 2 day for this problem. Thanks for reading !

• How to fill audio AVFrame (ffmpeg) with the data obtained from CMSampleBufferRef (AVFoundation) ?

  24 mai 2013, par Aleksei2414904

  I am writing program for streaming live audio and video from webcamera to rtmp-server. I work in MacOS X 10.8, so I use AVFoundation framework for obtaining audio and video frames from input devices. This frames come into delegate :

  -(void) captureOutput:(AVCaptureOutput*)captureOutput didOutputSampleBuffer:    (CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection*)connection ,

  where sampleBuffer contains audio or video data.

  When I recieve audio data in the sampleBuffer, I'm trying to convert this data into AVFrame and encode AVFramewith libavcodec :

      aframe = avcodec_alloc_frame();  //AVFrame *aframe;
  
      int got_packet, ret;
  
      CMItemCount numSamples = CMSampleBufferGetNumSamples(sampleBuffer); //CMSampleBufferRef
  
  
  
      NSUInteger channelIndex = 0;
  
  
  
      CMBlockBufferRef audioBlockBuffer = CMSampleBufferGetDataBuffer(sampleBuffer);
  
  
  
      size_t audioBlockBufferOffset = (channelIndex * numSamples * sizeof(SInt16));
  
  
  
      size_t lengthAtOffset = 0;
  
  
  
      size_t totalLength = 0;
  
  
  
      SInt16 *samples = NULL;
  
  
  
      CMBlockBufferGetDataPointer(audioBlockBuffer, audioBlockBufferOffset, &lengthAtOffset, &totalLength, (char **)(&samples));
  
  
  
              const AudioStreamBasicDescription *audioDescription = CMAudioFormatDescriptionGetStreamBasicDescription(CMSampleBufferGetFormatDescription(sampleBuffer));
  
  
  
      aframe->nb_samples =(int) numSamples;
  
  
  
      aframe->channels=audioDescription->mChannelsPerFrame;
  
  
  
      aframe->sample_rate=(int)audioDescription->mSampleRate;
  
  
  
       //my webCamera configured to produce 16bit 16kHz LPCM mono, so sample format hardcoded here, and seems to be correct
  
      avcodec_fill_audio_frame(aframe, aframe->channels, AV_SAMPLE_FMT_S16,
  
  
  
                               (uint8_t *)samples,
  
  
  
                                aframe->nb_samples *
  
  
  
                               av_get_bytes_per_sample(AV_SAMPLE_FMT_S16) *
  
  
  
                               aframe->channels, 0);  
  
      //encoding audio
  
      ret = avcodec_encode_audio2(c, &pkt, aframe, &got_packet);
  
      if (ret < 0) {
  
          fprintf(stderr, "Error encoding audio frame: %s\n", av_err2str(ret));
  
          exit(1);
  
      }

  The problem is that when I get so formed frames, I can hear the wanted sound, but it is slowing down and discontinuous (as if after each data frame comes the same frame of silence). It seems that something is wrong in the transformation from CMSampleBuffer to AVFrame , because the preview from the microphone created with AVFoundation from the same sample buffers played normally.

  I would be grateful for your help.

  UPD : Creating and initializing the AVCodceContext structure
   

      audio_codec= avcodec_find_encoder(AV_CODEC_ID_AAC);
  
      if (!(audio_codec)) {
  
          fprintf(stderr, "Could not find encoder for '%s'\n",
  
                  avcodec_get_name(AV_CODEC_ID_AAC));
  
          exit(1);
  
      }
  
      audio_st = avformat_new_stream(oc, audio_codec);  //AVFormatContext *oc;
  
      if (!audio_st) {
  
          fprintf(stderr, "Could not allocate stream\n");
  
          exit(1);
  
      }
  
  
  
        audio_st->id=1;
  
        audio_st->codec->sample_fmt= AV_SAMPLE_FMT_S16;
  
        audio_st->codec->bit_rate = 64000;
  
        audio_st->codec->sample_rate= 16000;
  
        audio_st->codec->channels=1;
  
        audio_st->codec->codec_type= AVMEDIA_TYPE_AUDIO;