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• How OpenGL directly manipulates data on GPU that a video hardware decoded by FFmpeg CUDA

  24 janvier 2019, par gn cavalry

  Ubuntu 18.04
  FFmpeg 4.1
  CUDA 10.0

  What I want to do is using FFmpeg CUDA decode a video, directly peocess data on GPU by GLSL , then encode data using FFmpeg CUDA. Like this :

  Raw Video —> FFmpeg CUDA decoder —> GLSL —> FFmpeg CUDA encoder —> New Video

  Here is the short code :

  ret = avcodec_send_packet(decoder_ctx, pkt);
  
  while (ret >= 0) {
  
      ret = avcodec_receive_frame(decoder_ctx, frame);
  
  
  
      /**
  
       * Now CUDA decoded data is stored on GPU and referenced by frame
  
       * How can GLSL manipulate decoded data on GPU directly, 
  
       * without transfer it to CPU and load to GPU again by glTexImage2D()
  
       */
  
  
  
  
  
      // I don't if the following code is right, if GLSL processed data is still referenced by frame
  
      while (avcodec_send_frame(encoder_ctx, frame)) {
  
          avcodec_receive_packet(encoder_ctx, &enc_pkt);
  
      }
  
  }

  Can anyone help me ? Thanks very much !

• FFMpeg doesn't make a blued video on S3

  15 juin 2022, par uekyo

  I want to make a blued video but after running the below code, 48 bite file just appears. I tried mp3 file to transfer to wave then it worked well. Do you guys have any suggestions to make this solution ?

  


  import json
import os
import boto3

def lambda_handler(event, context):
    # boto3 client
    s3 = boto3.client("s3")

    # replace below configuration
    bucket_name = "testestest"
    key = "video1.mp4"

    # downloading file to /tmp directory within lambda
    lambda_file_path = f"/tmp/{key}"
    lambda_output_file_path = "/tmp/trancoded_english_audio.mp4"

    # downloading file
    s3.download_file(bucket_name, key, lambda_file_path)

    # transcoding
    os.system(f'/opt/ffmpeglib/ffmpeg -i {lambda_file_path} -vf "gblur=sigma=50" -c:a copy {lambda_output_file_path}')

    # uploading transcoded file
    s3.upload_file(
        Bucket=bucket_name,
        Key=lambda_output_file_path.split("/")[-1],
        Filename=lambda_output_file_path,
    )

    return {"statusCode": 200, "body": json.dumps("Hello from Srce Cde!")}


  


• libavf/avienc : store language metadata for XSUB streams

  9 novembre 2013, par Erik Olofsson

  libavf/avienc : store language metadata for XSUB streams
  Formatted in such a way that DivX certified players can decode it.
  
  Verified on Sony Playstation 3 and Philips DVP3380.
  Fixes ticket 2385
  Signed-off-by : Erik Olofsson <eaj.olofsson@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavformat/avienc.c