problem while playing mpegts-h264 video file

[paolo perotinus]

Hello.I encoded (with ffmpeg) two mpegts-h264 video file:

Uploadfiles.io - bruttofile.ts

  
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Uploadfiles.io - bruttofile.ts
 Upload files, for free, securely, anonymously, without limits. @UploadFilesFree  |   |

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Uploadfiles.io - bruttofile2.ts
  
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Uploadfiles.io - bruttofile2.ts
 Upload files, for free, securely, anonymously, without limits. @UploadFilesFree  |   |

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The first one is encoded  with gop-size=25, the second one with gop-size=5.
I'm trying to play them with (gstreamer 1.12.2):
"gst-launch-1.0 -v filesrc location=file.ts ! tsdemux name=demuxer demuxer. ! h264parse ! avdec_h264 ! autovideosink" 
and I can play well the second one, while in the first one many frames are dropped.

I can correctly play both of them with VLC or ffplay.
What's wrong with gst-launch and how can I fix it?Thanks
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