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• Capture user-defined segment of RTSP video using FFmpeg

  10 janvier 2019, par Tom Larcher

  I’m endeavouring to capture a segment of video from an RTSP (static not live) video stream using FFmpeg, however I’m not certain how this is achieved.

  I am presently able to cut a segment of video from a local video file using a command similar to the one below :

  ffmpeg -y -i input_video.mp4 -ss 0:04:41.215 -to 0:07:17.335 output_video.mp4

  However commands similar to the above don’t seem to be working for remote (RTSP) video files. I’ve taken a look around for ways in which this can be achieved, to no avail. I’ve come across information on capturing individual frames as well as methods of capturing RTSP video files for storage locally, but I can’t seem to connect the dots to capture only a selected portion of the RTSP video.

  Any help on this would be immensely appreciated.

• 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

  16 mai, 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