[mythtv] [PATCH] HDTV Recorder Patch
Daniel Thor Kristjansson
danielk at mrl.nyu.edu
Thu Dec 2 18:55:51 UTC 2004
On Wed, 1 Dec 2004, Isaac Richards wrote:
]Yeah, the old hdtvrecorder would treat sequence headers as gop starts if no
]real gop headers were found. Looking over your patch, I think you've broken
] else if (0xB8 == k1)
] else if (0xB3 == k1 && !_gop_seen)
I've updated the HDTV recorder patch:
It has four improvements motivated by John Poet's testing:
1) The PCR stream is recorded, even if it is not in the PMT.
This isn't in the old hdtvrecorder, but is needed to produce
valid streams when recording John's local CBS station. Thanks
go to Taylor Jacob for the info that lead to this bug fix.
2) If GOPs are not found the hdtvrecorder tries to use sequence
headers instead. This is in the old hdtvrecorder, but
got lost in the new hdtvrecorder code.
3) If neither GOPs, nor Sequence headers are found in the first 30
frames hdtvrecorder creates a jump table by marking every 15th
frame as a keyframe. This works for recordings but if we don't fix
the resolution change bug in ffmpeg, it could cause problems there.
Hopefully every stream will have a GOP or Sequence header anyway.
4) I created a statistics class TSStats which keeps track of the
streams we are not recording. If VB_RECORD is true the recorder
prints out the cummulative statistics once for every million
packets we see. This prevents debugging messages from swamping
the CPU, while providing the same information.
More information about the mythtv-dev