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• bash : receive single frames from ffmpeg pipe

  30 août 2014, par manu

  I’m trying to achieve single-frame handling in a pipe where the the j2c encoder "kdu_compress" (Kakadu) only accepts single files. To save harddrive space. I didn’t manage to pipe frames directly, so I’m trying to handle them via a bash script, by creating each picture, process it, and overwrite it with the next.

  Here is my approach. Thanks for your advice, I really want to climb this mountain, though I’m a bit fresh here thanks.

  ---

  Is it possible to pipe an ffmpeg output to a bash script and save the individual frame,
  do further commands with the file before the next frame is handled ?

  Best result so far is, that ALL frames are added into the intermediate file, without recognizing the end of a frame.

  I used this ffmpeg setting to pipe, example with .ppm :

  ffmpeg -y  -i "/path/to/source.mov" -an -c:v ppm -updatefirst 1 -f image2 - \
  
   | /path/to/receiver.sh

  and this script as a receiver.sh

  #!/bin/bash  
  
  
  
  while read a; 
  
  do 
  
      cat /dev/null > "/path/to/tempfile.ppm"; #to empty the file first
  
      cat $a >> "/path/to/tempfile.ppm";        #to fill one picture
  
  
  
      kdu_compress -i /path/to/tempfile.ppm -otherparams   #to process this intermediate
  
  
  
  done
  
  exit;

  Thank you very much.

• Index error with MoviePy and OSError : MoviePy error : failed to read the duration of file

  24 août 2022, par Alejandro

  I made a small script to concatenate some clips. The names of the clips are stored in another text file that is read from.

  


  I get the error first that

  


  in ffmpeg_parse_infos
line = [l for l in lines if keyword in l][index]
IndexError: list index out of range


  


  then during that exception above, another occurs below

  


  Traceback (most recent call last):&#xA;  File "e:\Projects\TwitchMontage\VideoCompilation\src\create_video.py", line 32, in <module>&#xA;    clips = create_clips_from_list(list)&#xA;  File "e:\Projects\TwitchMontage\VideoCompilation\src\create_video.py", line 20, in create_clips_from_list&#xA;    clip = VideoFileClip(str(video_file_path))&#xA;  File "C:\Users\Alejandro\AppData\Local\Programs\Python\Python38\lib\site-packages\moviepy\video\io\VideoFileClip.py", line 88, in __init__&#xA;    self.reader = FFMPEG_VideoReader(filename, pix_fmt=pix_fmt,&#xA;  File "C:\Users\Alejandro\AppData\Local\Programs\Python\Python38\lib\site-packages\moviepy\video\io\ffmpeg_reader.py", line 35, in __init__&#xA;    infos = ffmpeg_parse_infos(filename, print_infos, check_duration,&#xA;  File "C:\Users\Alejandro\AppData\Local\Programs\Python\Python38\lib\site-packages\moviepy\video\io\ffmpeg_reader.py", line 289, in ffmpeg_parse_infos&#xA;    raise IOError(("MoviePy error: failed to read the duration of file %s.\n"&#xA;OSError: MoviePy error: failed to read the duration of file E:\Projects\TwitchMontage\VideoCompilation\VideoFiles\raw_clips\clip0.mp4&#xA;</module>

  


  I suspect something is wrong with FFMPEG but I have no idea what to change to fix this. Is there any manipulation I can make to FFMPEG or the videos themselves to make them work with moviepy ?

  


  Code is below :

  


  import os
from moviepy.editor import VideoFileClip, concatenate_videoclips

PATH_TO_VALID_CLIPS = 'VideoCompilation/ClipData/valid_clips.txt'
PATH_TO_RAW_CLIPS = 'E:\Projects\TwitchMontage\VideoCompilation\VideoFiles\\raw_clips'
os.environ['IMAGEIO_FFMPEG_EXE'] = 'ffmpeg'

def read_valid_clips_list():
    #read valid clips
    file = open(PATH_TO_VALID_CLIPS, 'r')
    list = file.readlines()
    return list

def create_clips_from_list(list):
    clips = []
    for i, filename in enumerate(list):
        print(str(i) + '\n')
        video_file_path = os.path.abspath(os.path.join(PATH_TO_RAW_CLIPS, filename))
        print(video_file_path + '\n')
        clip = VideoFileClip(str(video_file_path))
        clips.append(clip)

    return clips

def create_draft(clips):
    draft = concatenate_videoclips(clips)
    draft.write_videofile("VideoCompilation/VideoFiles/videos/draft.mp4")
    return draft

list = read_valid_clips_list()
clips = create_clips_from_list(list)
draft = create_draft(clips)


  


  EDIT :

  


  I discovered something strange. When I manually create the combined video, there are no errors but the video created is corrupted and unplayable.

  


  

  


• Merge commit '435cd7bc99671bf561193421a50ac6e9d63c4266'

  28 septembre 2017, par James Almer

  Merge commit '435cd7bc99671bf561193421a50ac6e9d63c4266'
  * commit '435cd7bc99671bf561193421a50ac6e9d63c4266' :
  
    arm : vp9lpf : Use orrs instead of orr+cmp
  
    arm/aarch64 : vp9lpf : Calculate !hev directly
  
    aarch64 : vp9itxfm : Optimize 16x16 and 32x32 idct dc by unrolling
  
    arm : vp9itxfm : Optimize 16x16 and 32x32 idct dc by unrolling
  
    aarch64 : vp9mc : Calculate less unused data in the 4 pixel wide horizontal filter
  
    arm : vp9mc : Calculate less unused data in the 4 pixel wide horizontal filter
  
    aarch64 : vp9mc : Simplify the extmla macro parameters
  This commit is a noop, see
  
  ac6cb8ae5b1c56c4a3fceb635c60d05e447c4365
  
  bff07715904cc02f04eb5c5e171b431eb00f0c3b
  
  045e33ae3fee74e39b1321dddf727eacb1ecf541
  
  758302e4bc14e93989e7feb1135ec3f807c3310d
  
  148cc0bb890839bc2a9cda514c5e71acc39eb374
  
  f0ecbb13cf1cf706a1350dad657219dc7b3c131e
  
  92ab8374b1051dd632c3ccc326b6cb1d564f293f
  Merged-by : James Almer <jamrial@gmail.com>