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• How to using every 5 sec generate video output File Path to Encode with RTMP Formate write data in ios ? [on hold]

  16 juillet 2015, par Sandeep Joshi

  (void) segmentRecording:(NSTimer*)timer {
  
  if (!shouldBeRecording) {
  
      [timer invalidate];
  
  }
  
  AVAssetWriter *tempAssetWriter = self.assetWriter;
  
  AVAssetWriterInput *tempAudioEncoder = self.audioEncoder;
  
  AVAssetWriterInput *tempVideoEncoder = self.videoEncoder;
  
  self.assetWriter = queuedAssetWriter;
  
  self.audioEncoder = queuedAudioEncoder;
  
  self.videoEncoder = queuedVideoEncoder;
  
  NSLog(@"Switching encoders");
  
  
  
  dispatch_async(segmentingQueue, ^{
  
      if (tempAssetWriter.status == AVAssetWriterStatusWriting) {
  
          @try {
  
              [tempAudioEncoder markAsFinished];
  
              [tempVideoEncoder markAsFinished];
  
              [tempAssetWriter finishWritingWithCompletionHandler:^{
  
                  if (tempAssetWriter.status == AVAssetWriterStatusFailed) {
  
                      [self showError:tempAssetWriter.error];
  
                  } else {
  
                      [self uploadLocalURL:tempAssetWriter.outputURL];
  
                  }
  
              }];
  
          }
  
          @catch (NSException *exception) {
  
              NSLog(@"Caught exception: %@", [exception description]);
  
              //[BugSenseController logException:exception withExtraData:nil];
  
          }
  
      }
  
      self.segmentCount++;
  
      if (self.readyToRecordAudio && self.readyToRecordVideo) {
  
          NSError *error = nil;
  
          self.queuedAssetWriter = [[AVAssetWriter alloc] initWithURL:[OWUtilities urlForRecordingSegmentCount:segmentCount basePath:self.basePath] fileType:(NSString *)kUTTypeMPEG4 error:&error];
  
          if (error) {
  
              [self showError:error];
  
          }
  
          self.queuedVideoEncoder = [self setupVideoEncoderWithAssetWriter:self.queuedAssetWriter formatDescription:videoFormatDescription bitsPerSecond:videoBPS];
  
          self.queuedAudioEncoder = [self setupAudioEncoderWithAssetWriter:self.queuedAssetWriter formatDescription:audioFormatDescription bitsPerSecond:audioBPS];
  
          //NSLog(@"Encoder switch finished");
  
      }
  
  });}
  
  
  
  
  
  
  
  (void) uploadLocalURL:(NSURL*)url {
  
  NSLog(@"upload local url: %@", url);
  
  NSString *inputPath = [url path];
  
  NSString *outputPath = [inputPath stringByReplacingOccurrencesOfString:@".mp4" withString:@".ts"];
  
  NSString *outputFileName = [outputPath lastPathComponent];
  
  NSDictionary *options = @{kFFmpegOutputFormatKey: @"mpegts"};
  
  NSLog(@"%@ conversion...", outputFileName);
  
  [ffmpegWrapper convertInputPath:[url path] outputPath:outputPath options:options progressBlock:nil completionBlock:^(BOOL success, NSError *error) {
  
      if (success) {
  
          if (!isRtmpConnected) {
  
              isRtmpConnected = [rtmp openWithURL:HOST_URL enableWrite:YES];
  
          }
  
          isRtmpConnected = [rtmp isConnected];
  
  
  
          if (isRtmpConnected) {
  
  
  
              NSData *video = [NSData dataWithContentsOfURL:[NSURL URLWithString:outputPath]];
  
              NSUInteger length = [video length];
  
              NSUInteger chunkSize = 1024 * 5;;
  
              NSUInteger offset = 0;
  
              NSLog(@"original video length: %lu \n chunkSize : %lu", length,chunkSize);
  
            // Let's split video to small chunks to publish to media server
  
              do {
  
                  NSUInteger thisChunkSize = length - offset > chunkSize ? chunkSize : length - offset;
  
                  NSData* chunk = [NSData dataWithBytesNoCopy:(char *)[video bytes] + offset
  
                                                       length:thisChunkSize
  
                                                 freeWhenDone:NO];
  
                  offset += thisChunkSize;
  
  
  
                  // Write new chunk to rtmp server
  
                  NSLog(@"%lu", (unsigned long)[rtmp write:chunk]);
  
                  sleep(1);
  
              } while (offset < length);
  
          }else{
  
              [rtmp close];
  
          }
  
  
  
  
  
      } else {
  
          NSLog(@"conversion error: %@", error.userInfo);
  
      }
  
  }];}

  This code use for live streaming for send data using RTMP Wrapper.
  Not write in Socket properly because every 5 second to generate different file output file.

  This is proper way ?

  I have no idea how to get NSData in proper way.

  Please help me .

• FFmpeg - MJPEG decoding gives inconsistent values

  28 décembre 2016, par ahmadh

  I have a set of JPEG frames which I am muxing into an avi, which gives me a mjpeg video. This is the command I run on the console :

  ffmpeg -y -start_number 0 -i %06d.JPEG -codec copy vid.avi

  When I try to demux the video using ffmpeg C api, I get frames which are slightly different in values. Demuxing code looks something like this :

  AVFormatContext* fmt_ctx = NULL;
  
  AVCodecContext* cdc_ctx = NULL;
  
  AVCodec* vid_cdc = NULL;
  
  int ret;
  
  unsigned int height, width;
  
  
  
  ....
  
  // read_nframes is the number of frames to read
  
  output_arr = new unsigned char [height * width * 3 * 
  
                                  sizeof(unsigned char) * read_nframes];
  
  
  
  avcodec_open2(cdc_ctx, vid_cdc, NULL);
  
  
  
  int num_bytes;
  
  uint8_t* buffer = NULL;
  
  const AVPixelFormat out_format = AV_PIX_FMT_RGB24;
  
  
  
  num_bytes = av_image_get_buffer_size(out_format, width, height, 1);
  
  buffer = (uint8_t*)av_malloc(num_bytes * sizeof(uint8_t));
  
  
  
  AVFrame* vid_frame = NULL;
  
  vid_frame = av_frame_alloc();
  
  AVFrame* conv_frame = NULL;
  
  conv_frame = av_frame_alloc();
  
  
  
  av_image_fill_arrays(conv_frame->data, conv_frame->linesize, buffer, 
  
                       out_format, width, height, 1);
  
  
  
  struct SwsContext *sws_ctx = NULL;
  
  sws_ctx = sws_getContext(width, height, cdc_ctx->pix_fmt,
  
                           width, height, out_format,
  
                           SWS_BILINEAR, NULL,NULL,NULL);
  
  
  
  int frame_num = 0;
  
  AVPacket vid_pckt;
  
  while (av_read_frame(fmt_ctx, &vid_pckt) >=0) {
  
      ret = avcodec_send_packet(cdc_ctx, &vid_pckt);
  
      if (ret < 0)
  
          break;
  
  
  
      ret = avcodec_receive_frame(cdc_ctx, vid_frame);
  
      if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
  
          break;
  
      if (ret >= 0) {
  
          // convert image from native format to planar GBR
  
          sws_scale(sws_ctx, vid_frame->data, 
  
                    vid_frame->linesize, 0, vid_frame->height, 
  
                    conv_frame->data, conv_frame->linesize);
  
  
  
          unsigned char* r_ptr = output_arr + 
  
              (height * width * sizeof(unsigned char) * 3 * frame_num);
  
          unsigned char* g_ptr = r_ptr + (height * width * sizeof(unsigned char));
  
          unsigned char* b_ptr = g_ptr + (height * width * sizeof(unsigned char));
  
          unsigned int pxl_i = 0;
  
  
  
          for (unsigned int r = 0; r < height; ++r) {
  
              uint8_t* avframe_r = conv_frame->data[0] + r*conv_frame->linesize[0];
  
              for (unsigned int c = 0; c < width; ++c) {
  
                  r_ptr[pxl_i] = avframe_r[0];
  
                  g_ptr[pxl_i]   = avframe_r[1];
  
                  b_ptr[pxl_i]   = avframe_r[2];
  
                  avframe_r += 3;
  
                  ++pxl_i;
  
              }
  
          }
  
  
  
          ++frame_num;
  
  
  
          if (frame_num >= read_nframes)
  
              break;
  
      }
  
  }
  
  
  
  ...

  In my experience around two-thirds of the pixel values are different, each by +-1 (in a range of [0,255]). I am wondering is it due to some decoding scheme FFmpeg uses for reading JPEG frames ? I tried encoding and decoding png frames, and it works perfectly fine. I am sure this is something to do with the libav decoding process because the MD5 values are consistent between the images and the video :

  ffmpeg -i %06d.JPEG -f framemd5 -
  
  ffmpeg -i vid.avi -f framemd5 -

  In short my goal is to get the same pixel by pixel values for each JPEG frame as I would I have gotten if I was reading the JPEG images directly. Here is the stand-alone bitbucket code I used. It includes cmake files to build code, and a couple of jpeg frames with the converted avi file to test this problem. (give ’—filetype png’ to test the png decoding).

• Revision 30246 : Corrections de grosses boulettes sql Correction d’une boulette dans la ...

  27 juillet 2009, par kent1@… — Log

  Corrections de grosses boulettes sql
  Correction d’une boulette dans la déclaration des champs
  On ne permet la demande de réencodage que depuis le document original sinon vive ma perte de qualité
  On affiche un message indiquant que c’est une version encodée issue d’un autre document s’il y a lieu de le faire
  On encode les sons dorénavant