How to convert mov (MPEG4 + AAC) to avi without re-encoding?

[bobby_yan]

Originally Posted by Kron

Yamb (lossless MOV to MP4).
http://yamb.unite-video.com/

You may find some help here:
http://forum.doom9.org/forumdisplay.php?f=74

Thank you. But I encounter the same problem (A/V slightly out of synch) as described in my last post.

To convert .MOV to .MKV or .OGM with VirtualDubMod with video re-encoding or and without audio re-encoding:

1. Open the .AVS file in VirtualDubMod
2. Set video to "Full processing mode". Select compression (use, for example: xvid or x264 video codec)
3. Open stream list. Set audio to Direct stream copy.
4. Save file as .MKV or .AVI

[Kron]

Or you can just use Avidemux.
http://www.avidemux.org/

Originally Posted by Kron

Or you can just use Avidemux

AAC support was missing on the win32 two days ago
Now you can use Avidemux to convert to AVI, MP4 or OGM (MPEG-4 + AAC).

[bobby_yan]

Originally Posted by Stream Recorder

AAC support was missing on the win32 two days ago
Now you can use Avidemux to convert to AVI, MP4 or OGM (MPEG-4 + AAC).

I use AviSynth 2.4 (r3688).

When I use direct stream copy for both video and audio, the audio is choppy when playing the resulted AVI file in videolan and media player classic, and video-audio is slightly out of sych (2-3s, not a fixed displacement) in the resulted MP4 and OGM files.
But when I use direct stream copy for video and MP3 compression for audio (128kbps, 2 channels, CBR), there are no such problems in AVI or MP4 files.

I remember that MP4 does support AAC audio, but why does the out-of-synch problem exists in the first case? Thank you.

Information of the resulted MP4 files are as follows.

First case: direct audio stream copy
General #0
Complete name : D:\test.mp4
Format : MPEG-4
Format/Info : ISO 14496-1 Base Media
Format/Family : MPEG-4
File size : 816 MiB
PlayTime : 1h 6mn
Bit rate : 1708 Kbps
StreamSize : 2.79 MiB
Movie name : test.mp4
Performer : Avidemux
Screenplay by : Avidemux
Encoded date : UTC 1970-01-01 00:00:00
Tagged date : UTC 1970-01-01 00:00:00
Writing application : Lavf51.12.1

Video #0
Codec : MPEG-4 Visual
Codec profile : Streaming Video Profile/Level 1
Codec settings/BVOP : Yes
Codec settings/QPel : No
Codec settings/GMC : 0
Codec settings/Matri : Default
PlayTime : 1h 6mn
Bit rate : 1574 Kbps
Width : 720 pixels
Height : 540 pixels
Display Aspect ratio : 4/3
Frame rate : 24.941 fps
Resolution : 8 bits
Interlacement : Progressive
StreamSize : 752 MiB
Encoded date : UTC 1970-01-01 00:00:00
Tagged date : UTC 1970-01-01 00:00:00

Audio #0
Codec : AAC LC
Codec/Info : AAC Low Complexity
PlayTime : 1h 6mn
Bit rate : 128 Kbps
Channel(s) : 2 channels
Channel positions : L R
Sampling rate : 44 KHz
Resolution : 16 bits
StreamSize : 61.2 MiB
Encoded date : UTC 1970-01-01 00:00:00
Tagged date : UTC 1970-01-01 00:00:00

Second Case: re-encode audio as MP3
General #0
Complete name : D:\test_re-encode audio.mp4
Format : MPEG-4
Format/Info : ISO 14496-1 Base Media
Format/Family : MPEG-4
File size : 816 MiB
PlayTime : 1h 6mn
Bit rate : 1707 Kbps
StreamSize : 2.12 MiB
Movie name : test.mp4
Performer : Avidemux
Screenplay by : Avidemux
Encoded date : UTC 1970-01-01 00:00:00
Tagged date : UTC 1970-01-01 00:00:00
Writing application : Lavf51.12.1

Video #0
Codec : MPEG-4 Visual
Codec profile : Streaming Video Profile/Level 1
Codec settings/BVOP : Yes
Codec settings/QPel : No
Codec settings/GMC : 0
Codec settings/Matri : Default
PlayTime : 1h 6mn
Bit rate : 1574 Kbps
Width : 720 pixels
Height : 540 pixels
Display Aspect ratio : 4/3
Frame rate : 24.941 fps
Resolution : 8 bits
Interlacement : Progressive
StreamSize : 752 MiB
Encoded date : UTC 1970-01-01 00:00:00
Tagged date : UTC 1970-01-01 00:00:00

Audio #0
Codec : MPEG-1 Audio
PlayTime : 1h 6mn
Bit rate : 128 Kbps
Channel(s) : 2 channels
Sampling rate : 44 KHz
Resolution : 16 bits
StreamSize : 61.2 MiB
Encoded date : UTC 1970-01-01 00:00:00
Tagged date : UTC 1970-01-01 00:00:00

The fps of these two files are different from the one of the original MOV file. This is because the MOV file is severely out of syncn, and the AviSynth adjusts the fps when generating the MP4 files.

To convert .MOV (MPEG-4 + AAC) to .AVI (MPEG-4 + AAC) with VirtualDub with video and audio re-encoding:

1. Open the .AVS file in VirtualDub
2. Set video to "Full processing mode". Select video compression (use, for example: xvid or x264 video codec)
3. Set audio to Direct stream copy
4. Save file as .AVI

To convert .MOV (MPEG-4 + AAC) to .AVI (MPEG-4 + MP3) with VirtualDub with video and audio re-encoding:

1. Open the .AVS file in VirtualDub
2. Set video to "Full processing mode". Select video compression (use, for example: xvid or x264 video codec)
3. Set audio to Full processing mode. Select audio Compression (say, Lame MP3)
4. Save file as .AVI