Recherche avancée

Sur d’autres sites (8534)

• mobile-ffmpeg can't open gallery videos

  25 juillet 2020, par MoTahir

  I'm trying to practice video editing with ffmpeg, I made a sample app which allows the users to either record a video then edit it or choose a video from gallery to edit.

  


  When the user records videos with the application a temporary file is created then that file path is sent to ffmpeg to edit then save

  


  "-i $videoPath  -vf crop=ih/$screenR:ih $outPath"


  


  I'm just cropping the video then saving it as a test, The above command works as intended without any problems.

  


  When I try to edit videos from gallery it doesn't work, I understand that the storage system in new versions of android devices is different, the uri is just an address to the content not an actual path to the file

  


  the video path from gallery is something like this

  


  


  content ://media/external/file/38625

  


  


  ffmpeg can not access the video with that path so it can't edit it, what should I do ? thank you in advance.

  


• Vidgear write Video not open

  25 août 2020, par MrTuyen

  Source code

  



  Command : (https://drive.google.com/file/d/14YGKIhftAidQVvR_nMWY3oIhcWFzLERE/view?usp=sharing)

  



  No errors occurred. I have been trying to figure out how to write videos with Vidgear. I am working with windows and webcam.

  



  Error : "Output.mp4" Opened is a black color. (https://drive.google.com/file/d/11x-q_w59gdaAECtRIqi0MNGIOZ-Vuati/view?usp=sharing)

  



  # import required libraries
from vidgear.gears import CamGear
from vidgear.gears import WriteGear
import cv2

# Open live video stream on webcam at first index(i.e. 0) device
stream = CamGear(source=0).start()

# retrieve framerate from CamGear Stream and pass it as `-input_framerate` parameter
output_params = {"-input_framerate":stream.framerate}

# Define writer with defined parameters and suitable output filename for e.g. `Output.mp4`
writer = WriteGear(output_filename = 'Output.mp4', **output_params)

# loop over
while True:

    # read frames from stream
    frame = stream.read()

    # check for frame if None-type
    if frame is None:
        break


    # {do something with the frame here}


    # write frame to writer
    writer.write(frame)

    # Show output window
    cv2.imshow("Output Frame", frame)

    # check for 'q' key if pressed
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

# close output window
cv2.destroyAllWindows()

# safely close video stream
stream.stop()

# safely close writer
writer.close()


  


• avformat/webm_chunk : Open AVIOContext before initializing sub-muxer

  17 mai 2020, par Andreas Rheinhardt

  avformat/webm_chunk : Open AVIOContext before initializing sub-muxer
  The description of AVOutputFormat.init contains the statement that "this
  
  method must not write output". Due to this, the webm_chunk muxer defers
  
  opening the AVIOContext for the child muxer until avformat_write_header(),
  
  i.e. there is no AVIOContext when the sub-muxer's avformat_init_output()
  
  is called. But this violates the documentation of said function which
  
  requires the AVFormatContext to have an already opened AVIOContext.
  
  This commit fixes this.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/webm_chunk.c