This way re-initializations properly update end_pts, enabling
sub2video_heartbeat to call sub2video_update as expected to re-init
the sub2video AVFrame's contents and to feed a frame into the filter
chain.
This then fixes memory usage ballooning due to framesync waiting
for secondary input in case of no actual subtitle samples being present
for a while in source after a re-init occurs.
if (!ist->sub2video.frame)
return AVERROR(ENOMEM);
ist->sub2video.last_pts = INT64_MIN;
+ ist->sub2video.end_pts = INT64_MIN;
return 0;
}