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#1 | Link |
Registered User
Join Date: May 2007
Location: atlanta, GA, USA
Posts: 14
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lost audio sync after merging raw AC3 ripped from DVD and video encoded in H.264
Hi,
I have a PAL-encoded DVD that I want to compress and keep on my htpc hard disk. I followed the mencoder-mp4box-mkvmerge path to compress the video to H.264 with x264 and kept the AC3 audio intact. However, in the muxed MKV file, the audio keeps drifting. I tried changing audio frame duration, sync and delay options in mkvmerge to no avail. I hope somebody can spot some obvious mistake I am making. Here's how I did it: Code:
# compress video mencoder dvd://1 -dvd-device /media/cdrom -ovc x264 -nosound -x264encopts subq=6:partitions=all:8x8dct:me=umh:frameref=5:bframes=3:b_pyramid:weight_b:crf=22:threads=2 -of rawvideo -o rip.h264 # put raw video in MP4 container MP4Box -add rip.h264 rip.mp4 # dump raw AC3 audio to dump.stream file mplayer dvd://1 -dvd-device /media/cdrom -dumpaudio # rename audio file and mux into MKV container mv streamp.dump streamp.dump.ac3 mkvmerge -o rip.mkv stream.dump.ac3 rip.mp4 Code:
$ mkvinfo rip.mkv + EBML head |+ Doc type: matroska |+ Doc type version: 1 |+ Doc type read version: 1 + Segment, size 736098744 |+ Seek head (subentries will be skipped) |+ EbmlVoid (size: 4027) |+ Segment information | + Timecode scale: 1000000 | + Muxing application: libebml v0.7.7 + libmatroska v0.8.1 | + Writing application: mkvmerge v2.0.2 ('You're My Flame') built on Jul 16 2008 20:03:58 | + Duration: 5533.120s (01:32:13.120000000) | + Date: Mon Oct 27 15:02:39 2008 UTC | + Segment UID: 0xde 0xe3 0x52 0xab 0xac 0x71 0xbf 0x1b 0xbe 0x5c 0xae 0xdd 0x70 0x30 0x76 0x35 |+ Segment tracks | + A track | + Track number: 1 | + Track UID: 3719640652 | + Track type: audio | + Enabled: 1 | + Default flag: 1 | + Forced flag: 0 | + Lacing flag: 1 | + MinCache: 0 | + Timecode scale: 1.000000 | + Max BlockAddition ID: 0 | + Codec ID: A_AC3 | + Codec decode all: 1 | + Default duration: 32.000ms (31.250 fps for a video track) | + Language: und | + Audio track | + Sampling frequency: 48000.000000 | + Channels: 6 | + A track | + Track number: 2 | + Track UID: 2748424880 | + Track type: video | + Enabled: 1 | + Default flag: 1 | + Forced flag: 0 | + Lacing flag: 0 | + MinCache: 1 | + Timecode scale: 1.000000 | + Max BlockAddition ID: 0 | + Codec ID: V_MPEG4/ISO/AVC | + Codec decode all: 1 | + CodecPrivate, length 42 | + Default duration: 40.000ms (25.000 fps for a video track) | + Language: und | + Video track | + Pixel width: 720 | + Pixel height: 480 | + Interlaced: 0 | + Display width: 768 | + Display height: 480 |+ EbmlVoid (size: 1024) |+ Cluster I'd be happy to give more info. Anybody have any clues for me? Thanks in advance. ![]() |
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#2 | Link |
Registered User
Join Date: May 2007
Location: atlanta, GA, USA
Posts: 14
|
solved it with -vf harddup
Nevermind, it was because mencoder skipped frames while encoding the video. Adding a "-vf harddup" fixed the discrepancy between the audio and video. See the mencoder man page for description of harddup. So it works now!
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Tags |
ac3, mencoder, mp4box, sync error, x264 |
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