[mythtv-users] unusual behavior of transcoded mpeg-4 recordings
David Murphy
dm1000 at gmail.com
Thu Mar 15 22:42:43 UTC 2007
I did a bit of searching but didn't come up w/ a description that neatly
matched this symptom.
I've been transcoding HD and SD programs captured by my air2pc card.
The programs transcode fine and look great when played back. I can skip
and jump forward or back to my hearts content and the playback will
resume normally. However, if I pause, fast forward or rewind at any
speed, playback will not resume properly. For example, if I pause a
transcoded program and then resume playback the video appears to play at
~1/2 speed or perhaps it would be more accurate to say that it appears
to play at 1/2 normal framerate although the audio remains synced. If I
were then to press Fast Forward to 3x speed the video smooths out and
plays at normal framerate except of course there is no audio.
I haven't changed any of the compression settings that had warnings
attached to them. For example, here is a profile that seems to generate
the problem:
-lossless transcoding: NO
-resize video while transcoding: YES
-width: 480 height: 480
-codec: mpeg-4
-bitrate: 2200
-max quality: 2
-min quality: 15
-max quality difference between frames: 3
-scale bitrate for frame size: NO
-enable high-quality encoding: YES
-enable 4MV encoding: YES
-enable interlaced DCT encoding: NO
-enable interlaced motion estimation: NO
AUDIO
codec: mp3
sampling rate: 32000
mp3 quality: 5
volume: 90
This is a Mythdora 3.2 system. I'm not sure why playback would be
normal after a skip or jump but not after a pause. Am I using one or
more problematic transcoder settings?
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