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• How to extract frames from the In-memory mp4 file (bytes buffer) in Python ?

  9 juillet 2020, par stlaza

  Now, my solution extracts images with saving bytes on disk using OpenCV/FFmpeg :

  


  from fastapi import APIRouter, UploadFile, File

@router.post("/")
def extract_stream_frames(stream: UploadFile = File(...)):
    temp_filename = os.path.join(tempfile.gettempdir(), str(uuid.uuid4()) + ".mp4")
    # print(stream.content_type)
    local_temp_file = open(temp_filename, "wb")
    local_temp_file.write(stream.file.read())
    local_temp_file.close()
    try:
        images = video.sampling(local_temp_file.name, num_frames=Config.IMAGES_PER_STREAM)
        images = list(map(lambda array: image.preprocess(array, Config.IMAGE_HEIGHT, Config.IMAGE_WIDTH), images))
        result = classify(images=images)
    finally:
        os.remove(local_temp_file.name)
    return result


  


  Frames extracting function :

  


  def sampling(video_path: str, num_frames: int):
    cam = cv2.VideoCapture(video_path)
    images = []
    while True:
        ret, frame = cam.read()
        if ret:
            images.append(cv2.cvtColor(frame, cv2.COLOR_BGR2RGB))
        else:
            break
    cam.release()
    cv2.destroyAllWindows()
    total_frames = len(images)
    images = [images[frame_no] for frame_no in range(0, total_frames, (total_frames + num_frames -1) // num_frames)]

    return images


  


  Is there a any solution that doesn't require saving stream on disk ?

  


• how to decode h264 data from rtsp stream directively to BGR24 pixel format for cv::Mat or cv::cuda::GpuMat with ffmpeg c lib on NVIDIA GPU ?

  30 septembre 2019, par Wussup

  I want decode h264 dirctively to cv::Mat or cv::cuda::GpuMat without sws_scale to saving CPUs.

  So is there any way to make it realized ? thanks in advance.

• avcodec : Don’t anonymously typedef structs

  22 septembre 2014, par Diego Biurrun

  avcodec : Don’t anonymously typedef structs
  

  • [DBH] libavcodec/aacpsy.c
  • [DBH] libavcodec/ac3dec.c
  • [DBH] libavcodec/alac.c
  • [DBH] libavcodec/alsdec.c
  • [DBH] libavcodec/amrwbdec.c
  • [DBH] libavcodec/ansi.c
  • [DBH] libavcodec/atrac1.c
  • [DBH] libavcodec/avs.c
  • [DBH] libavcodec/binkaudio.c
  • [DBH] libavcodec/bitstream.c
  • [DBH] libavcodec/c93.c
  • [DBH] libavcodec/cdxl.c
  • [DBH] libavcodec/cinepak.c
  • [DBH] libavcodec/cook.c
  • [DBH] libavcodec/cscd.c
  • [DBH] libavcodec/dcadec.c
  • [DBH] libavcodec/elbg.c
  • [DBH] libavcodec/g723_1.c
  • [DBH] libavcodec/gif.c
  • [DBH] libavcodec/huffman.c
  • [DBH] libavcodec/idcinvideo.c
  • [DBH] libavcodec/iff.c
  • [DBH] libavcodec/imc.c
  • [DBH] libavcodec/kgv1dec.c
  • [DBH] libavcodec/libopenjpegdec.c
  • [DBH] libavcodec/libopenjpegenc.c
  • [DBH] libavcodec/libspeexdec.c
  • [DBH] libavcodec/libspeexenc.c
  • [DBH] libavcodec/mimic.c
  • [DBH] libavcodec/nuv.c
  • [DBH] libavcodec/proresdec.c
  • [DBH] libavcodec/qcelpdec.c
  • [DBH] libavcodec/qdm2.c
  • [DBH] libavcodec/ra288.c
  • [DBH] libavcodec/roqaudioenc.c
  • [DBH] libavcodec/roqvideoenc.c
  • [DBH] libavcodec/rv34_parser.c
  • [DBH] libavcodec/sipr.c
  • [DBH] libavcodec/srtdec.c
  • [DBH] libavcodec/svq3.c
  • [DBH] libavcodec/truespeech.c
  • [DBH] libavcodec/v210enc.h
  • [DBH] libavcodec/vble.c
  • [DBH] libavcodec/vc1_parser.c
  • [DBH] libavcodec/vc1dec.c
  • [DBH] libavcodec/vorbisdec.c
  • [DBH] libavcodec/vorbisenc.c
  • [DBH] libavcodec/wmalosslessdec.c
  • [DBH] libavcodec/wmaprodec.c
  • [DBH] libavcodec/wmavoice.c
  • [DBH] libavcodec/zerocodec.c