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• x264 segmentation error :in ff_rgb24ToY_avx ()

  20 octobre 2017, par helloliu

  On my Ubunutu 16.04,I compiled the ffmpeg 、nasm and x264 code as follows :

  cd ffmeg/
  
  ./configure &&make &&make install 
  
  git clone http://git.videolan.org/git/x264.git
  
  cd x264/
  
  ./configure &&make &&make install 

  And then, I run in the follow way :

  ./x264 --input-res=1080x1920 --input-csp=rgb --output ~/x264/raw_framews.264  ~/x264/raw_framews

  Unfortunately,it reports with the errors as follows :

    lavf [error]: could not open input file
  
    avs [error]: failed to load avisynth
  
    raw [info]: 1080x1920p 0:0 @ 25/1 fps (cfr)
  
    resize [warning]: converting from rgb24 to yuv420p
  
    x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
    x264 [info]: profile High, level 4.0
  
    [swscaler @ 0x3f31540] Warning: data is not aligned! This can lead to a speedloss
  
    Thread 1 "x264encode" received signal SIGSEGV, Segmentation fault.
  
    0x0000000000534777 in ff_rgb24ToY_avx ()

  Can anyone help us with this error ? many thanks.

• python converting video to audio

  29 janvier, par programmer44

  We are working on a project to convert video to audio, and this is the sample code :

  



  from converter import Converter
from moviepy.editor import *
c = Converter()
clipv = 'g.mp4'
clipc = VideoFileClip(clipv).subclip(0,20)
conv = c.convert(clipc, 'clip5.mp3', {'format':'mp3','audio':{'codec': 'mp3','bitrate':'22050','channels':1}})
for timecode in conv:
    pass    


  



  However, it gives me this error

  



  Traceback (most recent call last)&#xA; File "del.py", line 7, in <module>&#xA;    for timecode in conv:&#xA; File "/usr/local/lib/python2.7/dist-packages/converter/__init__.py", line 181, in convert&#xA;    if not os.path.exists(infile):&#xA; File "/usr/lib/python2.7/genericpath.py", line 18, in exists&#xA;    os.stat(path)&#xA;TypeError: coercing to Unicode: need string or buffer, instance found&#xA;</module>

  



  Of course, the other alternative is to use ffmpeg, but the problem is that the video in this case is an object instance, and as of now I am yet to find a way of passing object instances from python to bash.

  



  The video object could be written as a video file, but that will lead to lots of time wastage, as the conversion takes place inside a loop.

  



  It is quite time consuming to have to write the video file time and again, so as to easily extract audio from it.

  



  I would highly appreciate any solution that will either help me get around the above error, or any that will allow me to pass the video fileclip object instance to bash ffmpeg as a variable.

  


• libavcodec/h264_parse : don't use uninitialized value when chroma_format_idc==0

  7 septembre 2017, par Mark Wachsler

  libavcodec/h264_parse : don't use uninitialized value when chroma_format_idc==0
  When parsing a monochrome file, chroma_log2_weight_denom was used without
  
  being initialized, which could lead to a bogus error message being printed, e.g.
  
    [h264 @ 0x61a000026480] chroma_log2_weight_denom 24576 is out of range
  
  It also could led to warnings using AddressSanitizer.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/h264_parse.c