> On 2016 Oct 8, at 2:38 PM, Alexey Eromenko <[email protected]> wrote:
> 
>> I haven’t looked at your file, but the first thing I would do is compare 
>> your encoding settings (which, as far as I can see, you still haven’t 
>> posted) to the video specifications of the playback device.  For your iPad 
>> Pro, they are:
> 
> I posted everything. All default settings still cause the problem for
> a few specific videos (the vast majority of my encoded videos work
> just fine)..
> 
> 
> $ ffmpeg -i $INPUT.y4m  -b:v 1200k -s 640x360 $OUTPUT.mp4
> 
> FFmpeg's encoder output:
> http://pastebin.com/NgkJVARD

I’ve never seen an ffmpeg configuration output that looks like that, but what 
do I know.  Also it gives you a warning that there is a "library configuration 
mismatch" - I don’t know what that is but would fix that before looking for 
other problems.

I don’t see anything obvious in the output that should make it incompatible 
with Apple’s specs.
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