id summary reporter owner description type status priority milestone component version severity resolution keywords cc mlocked 8864 mythtranscode corrupting recordings when transcoding to MPEG4 (NUV->NUV) nate sphery "Have seen this behavior for about a week now. Currently at r26104 on the trunk. When running mythtranscode on a HD recording using the ""Low Quality"" profile and MPEG4, I have had a number of corrupted recordings. The output file sizes are approximately 1/3 of their normal size for typical recordings. The audio appears fine, however all but a few sporadic frames of video are gone/corrupted. Note: Some of these recordings may have been tagged for transcoding twice, i.e. mythtranscode has been run on them twice with the same settings. When picking shows for transcode, I sometimes accidentally re-transcode recordings, however this has never caused any issues in the past and typically results in an innocuous no-op. So this behavior might be specific to transcoding twice, I cannot tell for sure. Perhaps an option allowing myth to skip transcoding shows that have already been transcoded could be added (will check the tickets if a request for this has already been made) When playing one of the corrupted recordings, the frontend streams this output to the console: {{{ [mpeg4 @ 0x70425c0] slice end not reached but screenspace end (70 left 7FE828, score= -3) [mpeg4 @ 0x70425c0] concealing 3600 DC, 3600 AC, 3600 MV errors [mpeg4 @ 0x70425c0] slice end not reached but screenspace end (70 left 7FBFA7, score= -3) [mpeg4 @ 0x70425c0] concealing 3600 DC, 3600 AC, 3600 MV errors [mpeg4 @ 0x70425c0] slice end not reached but screenspace end (70 left 7F9267, score= -3) [mpeg4 @ 0x70425c0] concealing 3600 DC, 3600 AC, 3600 MV errors 2010-09-04 21:47:20.850 OSD: Base theme size: 1280x720 2010-09-04 21:47:20.850 OSD: Scaling factors: 0.85625x0.972222 [mpeg4 @ 0x70425c0] slice end not reached but screenspace end (70 left 7F2829, score= -3) [mpeg4 @ 0x70425c0] concealing 3600 DC, 3600 AC, 3600 MV errors [mpeg4 @ 0x70425c0] slice end not reached but screenspace end (72 left 7F2187, score= -3) [mpeg4 @ 0x70425c0] concealing 3600 DC, 3600 AC, 3600 MV errors 2010-09-04 21:47:20.866 OSD: Base theme size: 1280x720 2010-09-04 21:47:20.866 OSD: Scaling factors: 0.85625x0.972222 [mpeg4 @ 0x70425c0] slice end not reached but screenspace end (66 left 6E0072, score= -3) [mpeg4 @ 0x70425c0] concealing 3600 DC, 3600 AC, 3600 MV errors }}} " defect closed minor MythTV - Mythtranscode Unspecified medium Fixed 0