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Sur d’autres sites (7324)

  • ValueError When Reading Video Frame

    27 juin 2016, par Bassie

    I am following this article, from where I got this code :

    FFMPEG_BIN ="Z:\ffmpeg\bin\ffmpeg.exe"
    

    
import subprocess as sp
    
command = [ FFMPEG_BIN,
    
            '-i', 'video.mp4',
    
            '-f', 'image2pipe',
    
            '-pix_fmt', 'rgb24',
    
            '-vcodec', 'rawvideo', '-']
    
pipe = sp.Popen(command, stdout = sp.PIPE, bufsize=10**8, shell=True)
    

    
import numpy
    
# read 420*360*3 bytes (= 1 frame)
    
raw_image = pipe.stdout.read(420*360*3)
    
# transform the byte read into a numpy array
    
image =  numpy.fromstring(raw_image, dtype='uint8')
    
image = image.reshape((360,420,3))
    
# throw away the data in the pipe's buffer.
    
pipe.stdout.flush()

    When I run it I see this error :

    Traceback (most recent call last):
    
  File "Z:\py\ffmtest\test.py", line 16, in <module>
    
    image = image.reshape((360,420,3))
    
ValueError: total size of new array must be unchanged
    
</module>

    Where line 16 is image = image.reshape((360,420,3)). I think this error is produced by numpy, but probably because I am calculating the values for my video incorrectly.

    Output :

    raw_image : b’ ’

    len(raw_image) : 0

    image : [ ]

    len(image) : 0

    I am not sure whether I am passing in the correct values for read or reshape functions - any help at all is much appreciated !

  • avformat/format : Stop reading data at EOF during probing

    10 mai 2023, par Michael Niedermayer
    avformat/format : Stop reading data at EOF during probing

    Issue found by : Сергей Колесников
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavformat/format.c

  • Not reading the first character of every second line in a file [duplicate]

    13 janvier 2024, par Monki Majik

    In a BASH script (latest Xubuntu) this successfully reads and prints every line in mp4.txt

    &#xA;

    ls *.mp4 > mp4.txt&#xA;while read F ; do&#xA;    echo $F&#xA;    echo ${F/mp4}mkv&#xA;#        ffmpeg -i "$F" -map 0 -c copy "${F/mp4}mkv"&#xA;done &lt; ./mp4.txt&#xA;

    &#xA;

    Uncommenting the ffmpeg line causes the first character from every other line in mp4.txt to not be in F.

    &#xA;

    I'm expecting every file line to be read consistently.

    &#xA;

    I've tried Bash : Special characters lost when reading file

    &#xA;

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