How to encode a partial video by using "encodebin"?

[Victor]

Hi everyone,

How to re-encode a partial video by using "encodebin"? The last time I 
tried, the "encodebin" element encoded the whole video stream, and it 
did not help if `gst_element_seek_simple` to the position I wanted to 
start extracting from. Yes, it was dumb I knew. Just tried and wished to 
be lucky. Anyway, there must be something missing. What objects shall be 
modified before they arrive at "encodebin", the buffers, events or 
queries? It obviously is doable to re-encode a partial video file and 
save to a new one, because that is what GES is doing, to re-encode only 
a part of a whole. I tend not to use GES, because sometimes prefer 
extracting videos without re-encoding, and it seems inevitable for GES 
to re-encode the clip. So, what data shall be modified before they flow 
into the "encodebin" element? Thanks.

Victor