Django的videothumbs和使用<a href="https://github.com/macmichael01/django-videothumbs" rel="nofollow">django-videothumbs</a> 視頻領域「列表索引超出範圍」錯誤

Question

Im爲：

video = videothumbs.VideoThumbField(upload_to='videos', sizes=((125,125),(300,200),)) 

在上傳，上傳的視頻，但在創建縮略圖我有這樣的錯誤：

Exception Value: list index out of range Exception Location:/library/videothumbs.py in generate_thumb, line 51

和第51行：

for c in range(len(histogram[0])): 
    ac = 0.0 
    for i in range(n): 
     ac = ac + (float(histogram[i][c])/n) 
     avg.append(ac) 

視頻檔案有什麼問題？

編輯： 與print histogram我：

sh: ffmpeg: command not found 

但在終端：

FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard 
Mac OSX universal build for ffmpegX 
configuration: --enable-memalign-hack --enable-mp3lame --enable-gpl --disable-vhook -- disable-ffplay --disable-ffserver --enable-a52 --enable-xvid --enable-faac --enable-faad --enable-amr_nb --enable-amr_wb --enable-pthreads --enable-x264 
libavutil version: 49.0.0 
libavcodec version: 51.9.0 
libavformat version: 50.4.0 
built on Apr 15 2006 04:58:19, gcc: 4.0.1 (Apple Computer, Inc. build 5250) 
usage: ffmpeg [[infile options] -i infile]... {[outfile options] outfile}... 
Hyper fast Audio and Video encoder 

在此先感謝

Answer 1

你檢查的histogram[0]價值？最有可能histogram沒有任何元素。

我會改變代碼：

if len(histogram) > 0: 
    for c in range(len(histogram[0])): 
    ac = 0.0 
    for i in range(n): 
     ac = ac + (float(histogram[i][c])/n) 
     avg.append(ac)