Stream video while downloading iOS

Question

I am using iOS 7 and I have a .mp4 video that I need to download in my app. The video is large (~ 1 GB) which is why it is not included as part of the app. I want the user to be

Answer 1

I can only assume that the MPMoviePlayerViewController caches the file length of the file when you started it.

The way to fix (just) this issue is to first determine how large the file is. Then create a file of that length. Keeping an offset pointer, as the file downloads, you can overwrite the "null" values in the file with the real data.

So you get to a specific point in the download, start the MPMoviePlayerViewController, and let it run. I'd also suggest you use the "F_NOCACHE" flag (with fcntl()) so you bypass the file block cache (which means you will lower your memory footprint).

The downside to this architecture is that if you get stalled, and the movie player gets ahead of you, well, the user is going to have a pretty bad experience. Not sure if there is any way for you to monitor and take preemptive action.

EDIT: its quite possible that the video is not read sequentially, but certain information requires the player to essentially look ahead for something. If so, then this is doomed to fail. The only other possible solution is to use some software tool to sequentially order the file (I'm no video expert so cannot comment from experience on any of the above).

To test this out, you can construct a "damaged" video of varying lengths, and test that to see what works and what does not. For instance, suppose you have a 100Meg file. Write a little utility program, and over write the last 50Megs of data with zeros. Now play this video. Its should fail 1/2 through. If it fails right away, well, you now know that its seeking in the file.

If non sequential, its possible that its looking at the last 1000 bytes or so, in which case if you don't overwrite that things work as you want. If you get lucky and this is the case, you would eventually download the last 1000 bytes, then then start from the front of the file.

It really gets down to finding some way before introducing real networking into the picture, to play a partial file. You will surely find it easier to artificially introduce the networking conditions without really doing it real time.