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• Splitting video in short clip result in some being empty ?

  2 décembre 2018, par Édouard Lopez

  I’m trying to split a video (50-100Mo) into several small clips of a few seconds each. I don’t need re-encoding, hence my use of codec copy.

  However some of the resulting clips don’t have any video.

  Fast but no video in some files

  ffmpeg \
  
    -y \
  
    -i ./data/partie-1:-Apprendre-300-mots-du-quotidien-en-LSF.jauvert-laura.hd.mkv \
  
    -ss 0:00:07.00 \
  
    -codec copy \
  
    -loglevel error \
  
    -to 0:00:10.36 \
  
    'raw/0:00:07.00.au revoir.mkv'

  I also tried -map 0 -c copy, -acodec copy -map 0:a -vcodec copy -map 0:v or no option related to codec.

  Slow but complete

  No argument related to audio/video encoding, it’s working but pretty slow.

  ffmpeg -y \
  
    -i "$SOURCE_VIDEO_FILE" \
  
    -ss 0:05:37.69 \
  
    -to 0:05:40.64 \
  
    -loglevel error
  
    'raw/0:05:37.69.pas la peine.mkv'

  Question

  How do I split a video into small chunk ~2-4s when I have no need for re-encoding ?

  related : https://video.stackexchange.com/q/25365/23799

• ffmpeg is not executing clip.run() when compiled with pyinstaller

  24 septembre 2018, par Thriskel

  When executing the .exe file in another machine that doens’t have it’s requeriments installed, running the programs gives the error :

  Exception in thread Thread-1:
  
  Traceback (most recent call last):
  
    File "threading.py", line 916, in _bootstrap_inner
  
    File "threading.py", line 864, in run
  
    File "y2m.py", line 80, in workit
  
    File "site-packages\ffmpeg\_run.py", line 202, in run
  
    File "subprocess.py", line 707, in __init__
  
    File "subprocess.py", line 992, in _execute_child
  
  FileNotFoundError: [WinError 2] The system cannot find the file specified

  I’m compiling the exe file using the command :

  pyinstaller y2m.py

  I’ve been reading every other post in this and others forums refered to this kind of problem but I don’t seem to find or understand the way of fixing this.

  The source code is in here

  and the warny2m.txt file is in here

  Things that I have tried :

  • using —paths=pathToLibFolder
  • using -w
  • using an older pyinstaller version
  • adding python3 to path
  • using -p DIR to add C :\Python3\Lib location then sub locations, also individual scripts. (those 3 ways to see if it would work)

  EDIT :

  When using ffmpeg_run.py the code fails. line is clip.run() where clip presents the input and output file.

• avformat/mxfdec : extend mxf_handle_missing_index_segment for all clip wrapped essences

  20 mai 2018, par Marton Balint

  avformat/mxfdec : extend mxf_handle_missing_index_segment for all clip wrapped essences
  Also make sure we set a valid track index sid and a valid track edit rate in
  
  order for the index to be useful.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavformat/mxfdec.c