On Aug 23, 2018, at 1:13 PM, Bill Barnett <bill.barn...@jasniksolutions.com> 
wrote:
> 
> We are looking for help to determine why the first 7 to 10 seconds of mp4 
> data video is not displayed in most instances.

Tell whoever wrote that interface that “NTSC” and “720p” are incompatible terms.

As to your question, it’s obvious from the I-frame interval settings combined 
with the frame rate.  The -f flag you gave tells it to select the 10 fps 
stream, which only puts out a fresh I frame every 10 seconds, given 100 frame 
GOPs and 10 fps.  Until you get a closed GOP and a fresh I frame, the decoder 
can’t begin decoding, lacking references for most of the delta frame data.

If you want low latency video, you must use a shorter GOP.  That will require a 
higher encoding bit rate to get equivalent perceived quality.  TANSTAAFL.
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