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• How do I bind a specific wlan interface to an ffmpeg/ffplay call without modifying the source ?

  5 mai 2017, par Falimond

  I have two wifi USB adapters connected to a Raspberry Pi running Raspbian jessie with their respective wlan0 and wlan1 interfaces set up. I can successfully use wpa_supplicant to connect to two individual, identical devices from which I can individually access a UDP video stream using ffplay. Now I need to simultaneously bring up both UDP streams. This would be easy if the access URLs were different, but they are not and I cannot change the IP addresses, requiring another solution.

  Unless I am mistaken, there is no way to specify an interface in the call to ffplay/ffmpeg. I have looked through the FFmpeg source relevant to the UDP protocol and know that I can specify an interface in the appropriate setsockopt calls in libavformat/udp.c, but modifying the source in this way is rather involved and I’d like to avoid it if possible.

  I looked into adding namespaces using ip but this doesn’t seem like it will work because I can only bind the wireless hardware device phy0, not the separate wlan interfaces associated with phy0.

  Are there alternate means of dealing with such a situation where the UDP streams’ URLs are the same or am I stuck with modifying the FFmpeg source code ?

• Converting mkv files to mp4 with ffmpeg-python

  25 octobre 2020, par myth0s

  I have a lot of .mkv files that I'm trying to convert to .mp4, so I decided to try and program a solution in python. After a few hours, trying to figure out how to copy the subfolders too, I gave up on it and decided to stick with converting individual subfolders, and then copying them over to another directory.

  


  I've made a simple script, that should convert .mkv files that are in the same folder as the script. However, I keep getting this error :

  


  


  FileNotFoundError : [WinError 2] The system cannot find the file specified

  


  


  Here's my code :

  


  import os
import ffmpeg

start_dir = os.getcwd()

def convert_to_mp4(mkv_file):
    no_extension = str(os.path.splitext(mkv_file))
    with_mp4 = no_extension + ".mp4"
    ffmpeg.input(mkv_file).output(with_mp4).run()
    print("Finished converting {}".format(no_extension))

for path, folder, files in os.walk(start_dir):
    for file in files:
        if file.endswith('.mkv'):
            print("Found file: %s" % file)
            convert_to_mp4(file)
        else:
            pass



  


• avcodec/cuviddec : correctly set key_frame with interlaced content

  11 juin 2021, par stuhlo

  avcodec/cuviddec : correctly set key_frame with interlaced content
  Fixes #9283
  This fixes setting of 'key_frame' flag in AVFrame when input h264 packets represents individual fields of interlaced video.
  
  In this case, pairs of two consecutive fields represents a single decoded picture and have identical 'CurrPicIdx', however, only
  
  the first field is entirely intra-coded and has the flag 'intra_pic_flag' set and the second field was resetting the flag before
  
  it was even read in the function 'cuvid_output_frame'.
  Signed-off-by : Timo Rothenpieler <timo@rothenpieler.org>
  

  • [DH] libavcodec/cuviddec.c