readFrame error Matlab R2016a Mac OSX 10.11.1

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!

[Walter Roberson]

What do you get for

which -all SampleVidB1.m4v

[MJU]

Just the path to the file. VideoReader runs fine, seems to be readFrame that won't work.

Answer 1

[MJU]

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.

[liomsi liomsi]

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.