readFrame error Matlab R2016a Mac OSX 10.11.1

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MJU
MJU 2016-6-23
评论： liomsi liomsi 2022-1-6
Trying to convert a video to images. So far getting errors with 2 very simple lines of code--wondering if this is an issue of running on Mac. I converted the original .avi file to .m4v.
OBJ = VideoReader('SampleVidB1.m4v');
video = readFrame(OBJ);
The error:
Error using VideoReader/hasFrame (line 46)
Could not read file due to an unexpected error. Reason: Cannot Open
Error in VideoReader/readFrame (line 104)
if ~hasFrame(obj)
Additionally, I have seen mmread used in this application. Is it best to just download that from the file exchange and proceed? Thanks!
  2 个评论
MJU
MJU 2016-6-23
Just the path to the file. VideoReader runs fine, seems to be readFrame that won't work.

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回答（1 个）

MJU
MJU 2016-6-23
Ok, I seem to have found a solution. QuickTime was not allowing me to open the video as an .avi file so I had used VLC to convert it to a .m4v. The conversion had options for 'Video Codec' which was set to 'H.264' by default. I tried a more familiar looking option, 'MPEG-4' and the code runs. Will continue with the rest tomorrow, hopefully that resolves this issue.
  1 个评论
liomsi liomsi
liomsi liomsi 2022-1-6
My video codec is MPEG-4 and I still get this error.
I started to get this issue once I used video with a frame rate of 32 Hz (it is OK with other videos of frame rate 34 Hz).
Matlab version: 2017a.

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