1. Try with ffprobe util, and share the results here.
2. Share your sample files.
3. If problem reproduces with your app only, provide simplified, but
compiling&running&reproducing code sample.
4. Try increasing AVFormatContext.max_analyze_duration over
5*1000*1000, also .probe_size to sth more than default.

-- 
Andrey Utkin
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