Re: Read frame by frame mp4 file, need example.

[Антон Шаров]

Hi.
 
There was a bug in my pipe (hence WARN messages) and now my approach starts somehow work
( https://gist.github.com/sharov-am/78949b8866235ca14112818385893152 ). Given fps=15, code in gist
generate jpeg images for 1 sec., namely 14 images, and then start looping forever. Here is some dbg messages:
 
Step START msg
[cnt=0]  time = -1, pos = -1, def =-1, bytes = -1
===NEW STEP EVENT RAISE=====
Step START msg
[cnt=1]  time = -1, pos = -1, def =-1, bytes = -1
===NEW STEP EVENT RAISE=====
Step START msg
Step DONE msg
[cnt=2]  time = 132000000, pos = -1, def =0, bytes = -1
===NEW STEP EVENT RAISE=====
Step START msg
Step START msg
Step DONE msg
//skipped
[cnt=12]  time = 804000000, pos = -1, def =0, bytes = -1
===NEW STEP EVENT RAISE=====
Step START msg
Step START msg
Step DONE msg
[cnt=13]  time = 871000000, pos = -1, def =0, bytes = -1
===NEW STEP EVENT RAISE=====
Step START msg
Step START msg
Step DONE msg
[cnt=14]  time = 938000000, pos = -1, def =0, bytes = -1
===NEW STEP EVENT RAISE=====
 
As you may notice, time is changing but everything else not. More over, on 15 iteration
 
var result = pipeline.QueryPosition(Format.Buffers, out var pos);
 
return false and Error message in console:
 
 ERROR           videodecoder gstvideodecoder.c:2016:gst_video_decoder_src_query_default:<d3d11h264dec0> query failed
 
and it starts looping forever… So, what I’m doing wrong, why it handles only 1 sec. of video and then stuck? How can I advance stream to next frames?
 
Thanks in advance.
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