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• x86/af_afir : use three operand form forat some instructions

  4 janvier 2019, par James Almer

  x86/af_afir : use three operand form forat some instructions
  Fixes compilation with old yasm versions.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavfilter/x86/af_afir.asm

• Publish RTMP stream to Red5 Server form iOS camera

  7 septembre 2015, par Mohammad Asif

  Please look at following code, I have transformed CMSampleBufferRef into AV_CODEC_ID_H264 but I don’t know how to transmit it to Red5 server.

  Thanks,

  - (void)  captureOutput:(AVCaptureOutput *)captureOutput
  
    didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
  
       fromConnection:(AVCaptureConnection *)connection {
  
  
  
  //NSLog(@"This is working ....");
  
  
  
    // [connection setVideoOrientation: [self deviceOrientation] ];
  
  
  
  if( !CMSampleBufferDataIsReady(sampleBuffer) )
  
  {
  
      NSLog( @"sample buffer is not ready. Skipping sample" );
  
      return;
  
  } else {
  
  
  
      if (captureOutput == videoOutput) {
  
  
  
  
  
          CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
  
          CVPixelBufferLockBaseAddress(pixelBuffer, 0);
  
  
  
          // access the data
  
          float width = CVPixelBufferGetWidth(pixelBuffer);
  
          float height = CVPixelBufferGetHeight(pixelBuffer);
  
  
  
          //float bytesPerRow = CVPixelBufferGetBytesPerRowOfPlane(pixelBuffer, 0);
  
          unsigned char *rawPixelBase = (unsigned char *)CVPixelBufferGetBaseAddressOfPlane(pixelBuffer, 0);
  
  
  
  
  
          // Convert the raw pixel base to h.264 format
  
  
  
          if (codec == nil) {
  
  
  
              codec = 0;
  
              context = 0;
  
              frame = 0;
  
  
  
              fmt = avformat_alloc_context();
  
              //avformat_write_header(fmt, NULL);
  
  
  
              codec = avcodec_find_encoder(AV_CODEC_ID_H264);
  
  
  
              if (codec == 0) {
  
                  NSLog(@"Codec not found!!");
  
                  return;
  
              }
  
  
  
              context = avcodec_alloc_context3(codec);
  
  
  
              if (!context) {
  
                  NSLog(@"Context no bueno.");
  
                  return;
  
              }
  
  
  
              // Bit rate
  
              context->bit_rate = 400000; // HARD CODE
  
              context->bit_rate_tolerance = 10;
  
              // Resolution
  
  
  
              // Frames Per Second
  
              context->time_base = (AVRational) {1,25};
  
              context->gop_size = 1;
  
              //context->max_b_frames = 1;
  
              context->width = width;
  
              context->height = height;
  
              context->pix_fmt = PIX_FMT_YUV420P;
  
  
  
              // Open the codec
  
              if (avcodec_open2(context, codec, 0) < 0) {
  
                  NSLog(@"Unable to open codec");
  
                  return;
  
              }
  
  
  
              // Create the frame
  
              frame = av_frame_alloc();
  
              if (!frame) {
  
                  NSLog(@"Unable to alloc frame");
  
                  return;
  
              }
  
          }
  
  
  
          context->width = width;
  
          context->height = height;
  
  
  
          frame->format = context->pix_fmt;
  
          frame->width = context->width;
  
          frame->height = context->height;
  
  
  
          //int nbytes = avpicture_get_size(context->pix_fmt, context->width, context->height);
  
          //uint8_t* outbuffer = (uint8_t*)av_malloc(nbytes);
  
  //            AVFrame *pFrameDecoded = avcodec_alloc_frame();
  
  //            int num_bytes2 = avpicture_get_size(context->pix_fmt, frame->width, frame->height);
  
  //            uint8_t* frame2_buffer2 = (uint8_t *)av_malloc(num_bytes2 * sizeof(uint8_t));
  
  //            avpicture_fill((AVPicture*)pFrameDecoded, frame2_buffer2, PIX_FMT_YUVJ422P, 320, 240);
  
  
  
          frame->pts = (1.0 / 30) * 60 * count;
  
          avpicture_fill((AVPicture *) frame, rawPixelBase, context->pix_fmt, frame->width, frame->height);
  
  
  
          int got_output = 0;
  
          av_init_packet(&packet);
  
          //avcodec_encode_video2(context, &packet, frame, &got_output);
  
  
  
          do {
  
              avcodec_encode_video2(context, &packet, frame, &got_output);
  
              //avcodec_decode_video2(context, &packet, NULL, &got_output);
  
              //*... handle received packet*/
  
  
  
              if (isFirstPacket) {
  
                  [rtmp sendCreateStreamPacket];
  
                  isFirstPacket = false;
  
                  //av_dump_format(fmt, 0, [kRtmpEP UTF8String], 1);
  
                  avformat_alloc_output_context2(&ofmt_ctx, NULL, "flv", [kRtmpEP UTF8String]); //RTMP
  
              }
  
  
  
              packet.stream_index = ofmt_ctx->nb_streams;
  
              av_interleaved_write_frame(ofmt_ctx, &packet);
  
              count ++;
  
  
  
              //[rtmp write:[NSData dataWithBytes:packet.data length:packet.size]];
  
  
  
  
  
          } while(got_output);
  
  
  
          // Unlock the pixel data
  
          CVPixelBufferUnlockBaseAddress(pixelBuffer, 0);
  
  
  
          //[rtmp write:[NSData dataWithBytes:packet.data length:packet.size]];
  
  
  
      } else {
  
  
  
      }
  
  }   }   

• Combine multiple images to form a strip of images ffmpeg

  10 décembre 2019, par phuong do

  I wish to combine multiple images into a single strip of images, using FFMPEG.

  I have been trying to search this thing on google, but unable to find anything useful. All links take me to places where multiple images are combined to give a video output.

  Assuming that all the files are of the same width and height, how can I join them to get a single strip of images. Can anybody help me ?

  example image