* modules/codec/ffmpeg/encoder.c:
- use AV_NOPTS_VALUE instead of 0 when it's available
- reworked the hurry-up mode to start with disabling the B frames first
- reworked the hurry-up mode to remove my thread mess
- check that we don't feed ffmpeg with twice the same PTS (crashes ffmpeg)
- correctly flag the picture types
* modules/stream_out/transcode.c:
- use AV_NOPTS_VALUE instead of 0 when it's available
- copy block_t::i_flags to sout_buffer_t::i_flags (temporary)