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• How to reencode a h264 wiiU to a standar format video

  25 juin 2016, par didix16

  I’m trying to make a bridge between wiiU and web interface to view the video h264 signal. I’m not familiar with video programming but I’m searching some info about it. Following this documentation :

  • http://libdrc.org/docs/re/sc-vstrm.html
  • http://libdrc.org/docs/installation.html#patched-dependencies
    It says that wiiU works with a H.264 variation. So since there is someone who made a h264decoder of wiiU in python (https: //github.com/justjake/drc-sim-keyboard/blob/master/H264Decoder.py) I’ll want to decode that kind of h264 and transform it to some kind of standard video for stream and get it over tag on a html5 web page. It is possibly do it with ffmpeg libraries ?

  If it, can someone tell me how ? I’m programming the bridge in C++.

  Oh yes, at the moment I’m capturing the data from udp socket, so I just need transform the incoming data detailed in sc-vstrm.html documentation into some web stream video standard.

  Thank you so much guys :).

• ffmpeg : record 1 hour segment, right on the hour, no/little frame lost [closed]

  2 septembre 2024, par Jean-Michel

  I need to record 24/7 an incoming SRT stream into 1 hour chunks, starting right on the hour.
The start needs to be as close as XX:00:00.000 as possible and little to no frame lost between the recordings.

  


  For now I am using a systemd service with that ExecStart command :

  


  /usr/bin/ffmpeg -fflags +discardcorrupt -i 'srt://:4010?pkt_size=1316&mode=listener' -c copy -map 0:v:0 -map 0:a? -f segment -strftime 1 -segment_time 3600 -reset_timestamps 1 -segment_format ts '/somefolder/recording_%%d%%m%%Y_%%H%%M00.ts'


  


  And using a crontab to restart the service on the hour to insure the next file properly starts at the expected time.

  


  0 * * * * cd /etc/systemd/system && systemctl restart srt_recorder_4010.service


  


  Unfortunately, the restart of the service takes 5 to 10 seconds and we are loosing that duration in the recorded file.
If I'm not using the crontab, I get 1 hour files but I have no control on the start time.

  


  Any suggestion to get something more accurate ?
Could there be a way to combine ffmpeg internal ability to exactly segment 1 hour file but enforce to do it on the hour ?
Or externally, if there was a way to send a "next file" command (api, signal) to a perpetual running ffmpeg to change recording file ?

  


  Thanks

  


• MoviePy : Concatenating video clips causes weird glitches in final video

  16 mai 2022, par JohnSmithy1266

  Is there a way to successfully always patch up any clips together in such a way that prevents weird glitches ? I put together a .mp4 from smaller .mp4 files and I got a final video with weird glitches. I am running Python 3.6.1 on Windows 10 through Sublime Text 3. I used MoviePy to do the concatenation.

  



  The code :

  



  from moviepy.editor import VideoFileClip, concatenate_videoclips
import os.path

path = "C:/Users/blah/videos/out/"

cliparray = []

for filename in os.listdir(path):
    cliparray.append(VideoFileClip(path + filename))

final_clip = concatenate_videoclips(cliparray)

final_clip.write_videofile(path + "concatenatedvideo.mp4", codec = "libx264")


  



  The weird glitches :

  



  

  1. One of the clips turns into a 3x3 grid of smaller clips.

  


  2. Another has the audio not lined up with the video

  


  3. Another is sped up faster than what was normal.