readFrame returns nothing on videos with bit depth 10 bits

Question

YT 2018-10-19

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/424855-readframe-returns-nothing-on-videos-with-bit-depth-10-bits

回答： YT 2018-10-19

I'm trying to read the frames from MKV/MP4 videos with either `read` or `readFrame` but I noticed the following while doing so:

First: some MKV/MP4 files seem to work while others do not. Could this be because of different video encoding settings?
Second: using `read(v,framenumber)` the following error occured for some MKV/MP4 files:

 Error using VideoReader/read>readFramesInIndex (line 275)
  Dot indexing is not supported for  variables of this type.
 Error in VideoReader/read (line 154)
      videoFrames = readFramesInIndex(obj, varargin{1});

Third: using `readFrame(v)` returns nothing and no errors.

NOTE

I've posted this question (& answer) for myself and those who may encounter the same issue in the future

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

YT 2018-10-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/424855-readframe-returns-nothing-on-videos-with-bit-depth-10-bits#answer_342185

After carefully checking the differences between some of the videos, I noticed that some had bit depth of 10 bits (didn't work) while others had 8 bits (work). So after changing this (with ffmpeg), the videos became useable again. Still think it's weird that `readFrame` continued and finished without outputting anything.