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• Split a movie so that each GIF is under a certain file size

  9 novembre 2014, par Terence Eden

  Problem

  I want to convert a long movie into a series on animated GIFs.

  Each GIF needs to be <5MB.

  Is there any way to determine how large a GIF will be while it is being encoded ?

  Progress So Far

  I can split the movie into individual frames :

  ffmpeg -i movie.ogv -r 25 frameTemp.%05d.gif

  I can then use convert from ImageMagick to create GIFs. However, I can’t find a way to determine the likely file size before running the command.

  Alternatively, I can split the movie into chunks :

  ffmpeg -i movie.ogv -vcodec copy -ss 00:00:00 -t 00:20:00 output1.ogv

  But I’ve no way of knowing if, when I convert the file to a GIF it will be under 5MB.

  A 10 second scene with a lot of action may be over 5MB (bad !) and a static scene could be under 5MB (not a problem, but not very efficient).

  Ideas

  I think that what I want to do is convert the entire movie into a GIF, then find a way to split it by file size.

  Looking at ImageMagick, I can split a GIF into frames, but I don’t see a way to split it into animated GIFs of a certain size / length.

  So, is this possible ?

• 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

• 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.

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  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 :

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

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  Here's my code :

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  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



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