[mythtv-users] Error: Failed to decode frame. Position was: 0

[Greg Grotsky]

Hey guys, I'm trying to do a lossless transcode from MPEG2 to MPEG2 on a few
recordings.  I scheduled 4 of them to be transcoded, the first two succeeded
without an issue (3.2GB->2.1GB) but the second two are giving me problems.
When mythbackend kicks off the mythtranscode, the backend log starts spewing
tons of the error message from my subject line: "Failed to decode frame.
Position was: 0" and mythtranscode consumes 100% cpu while filling the log.
The status of the transcode from the "System Information" screen shows 0%
and doesn't appear to progress.  What can I do about this to debug?  The
recordings I'm transcoding are all from the same channel and are the same
program.  Here's my backend log:

2009-04-25 10:11:15.338 MainServer::ANN Monitor
2009-04-25 10:11:15.338 adding: mythbox as a client (events: 1)
2009-04-25 10:11:16.771 mythbackend: Running housekeeping thread
2009-04-25 10:11:16.874 JobQueue: Transcode Starting for The Simpsons "Good,
Sad and Drugly": Autodetect (3.4 GB)
2009-04-25 10:11:16.877 transcode: Transcode Starting: The Simpsons "Good,
Sad and Drugly": Autodetect (3.4 GB)
2009-04-25 10:11:16.912 UPnpMedia: BuildMediaMap VIDEO scan starting in
:/mythtv/shows:
2009-04-25 10:11:16.961 Using runtime prefix = /usr/local
2009-04-25 10:11:16.961 Empty LocalHostName.
2009-04-25 10:11:16.961 Using localhost value of mythbox
2009-04-25 10:11:16.970 New DB connection, total: 1
2009-04-25 10:11:16.973 Connected to database 'mythconverg' at host:
localhost
2009-04-25 10:11:16.974 Closing DB connection named 'DBManager0'
2009-04-25 10:11:16.974 Connected to database 'mythconverg' at host:
localhost
2009-04-25 10:11:16.976 Enabled verbose msgs: important
2009-04-25 10:11:16.977 New DB connection, total: 2
2009-04-25 10:11:16.978 Connected to database 'mythconverg' at host:
localhost
2009-04-25 10:11:16.983 Transcoding from
/mythtv/recordings3/1121_20090419185900.mpg to
/mythtv/recordings3/1121_20090419185900.mpg.tmp
2009-04-25 10:11:17.006 Connecting to backend server: 192.168.0.10:6543 (try
1 of 5)
2009-04-25 10:11:17.006 Using protocol version 44
2009-04-25 10:11:17.006 MainServer::ANN Monitor
2009-04-25 10:11:17.007 adding: mythbox as a client (events: 0)
2009-04-25 10:11:17.007 MainServer::ANN Monitor
2009-04-25 10:11:17.007 adding: mythbox as a client (events: 1)
2009-04-25 10:11:17.149 AFD: Opened codec 0x738980, id(MPEG2VIDEO)
type(Video)
2009-04-25 10:11:17.149 AFD: codec AC3 has 2 channels
2009-04-25 10:11:17.150 AFD: Opened codec 0x7390c0, id(AC3) type(Audio)
2009-04-25 10:11:17.183 Honoring the cutlist while transcoding
2009-04-25 10:11:17.185 Cutlist        :
0-3883,32176-41204,64793-78506,93973-104280,115017-118541
2009-04-25 10:11:17.185 Original Length: 118541 frames
2009-04-25 10:11:17.185 New Length     : 78086 frames
2009-04-25 10:11:17.186 Transcode: Looking for autodetect profile:
Autodetect from 720p
2009-04-25 10:11:17.188 New DB connection, total: 3
2009-04-25 10:11:17.189 Connected to database 'mythconverg' at host:
localhost
2009-04-25 10:11:17.205 SampleRate: Attempted to add a rate 32000 Hz, which
is not in the list of allowed rates.
2009-04-25 10:11:17.208 Transcode: Using autodetect profile: MPEG2
2009-04-25 10:11:17.208 Switching to MPEG-2 transcoder.
2009-04-25 10:11:17.216 Opening /mythtv/recordings3/1121_20090419185900.mpg
2009-04-25 10:11:17.228 Input #0, mpegts, from
'/mythtv/recordings3/1121_20090419185900.mpg':
2009-04-25 10:11:17.228   Duration: 00:32:58.02, start: 21701.748378,
bitrate: 14591 kb/s
2009-04-25 10:11:17.228     Stream #0.0[0x31]: Video: mpeg2video, yuv420p,
1280x720 [PAR 1:1 DAR 16:9], 19000 kb/s, 59.94 tb(r)
2009-04-25 10:11:17.228     Stream #0.1[0x34](eng): Audio: ac3, 48000 Hz,
stereo, s16, 256 kb/s
2009-04-25 10:11:17.237 #0 PTS:06:01:42.116 Delta: 0.0ms queue: 26
2009-04-25 10:11:17.237 #1 PTS:06:01:42.100 Delta: 16.3556ms queue: 2
2009-04-25 10:11:17.303 UPnpMedia: BuildMediaMap Done. Found 1180 objects
2009-04-25 10:11:17.995 Converting frame #21 from B to I
2009-04-25 10:11:17.998 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.998 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.998 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.998 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.998 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.998 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.999 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.999 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.999 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.999 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.999 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.999 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.999 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.999 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.999 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.999 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.999 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.999 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.999 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.999 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.999 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.999 Failed to decode frame.  Position was: 0
2009-04-25 10:11:17.999 Failed to decode frame.  Position was: 0
2009-04-25 10:11:18.000 Failed to decode frame.  Position was: 0
etc...
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