Привет.
При вырезании фрагмента из исходного видео и сохранении изменяется формат звука, при этом звук замедлен (синхронизация вроде не нарушена)
Исходный формат такой:
General
Complete name : D:\UVS060625-001.AVI
Format : AVI
Format/Info : Audio Video Interleave
Commercial name : DVCPRO
Format profile : OpenDML
File size : 6.10 GiB
Duration : 30mn 13s
Overall bit rate mode : Constant
Overall bit rate : 28.9 Mbps
Recorded date : 2006-06-24 20:51:55.000
Video
ID : 0
Format : DV
Commercial name : DVCPRO
Duration : 30mn 13s
Bit rate mode : Constant
Bit rate : 24.4 Mbps
Encoded bit rate : 28.8 Mbps
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 4:3
Frame rate mode : Constant
Frame rate : 25.000 fps
Standard : PAL
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Interlaced
Scan order : Bottom Field First
Compression mode : Lossy
Bits/(Pixel*Frame) : 2.357
Time code of first frame : 00:29:39:13
Time code source : Subcode time code
Stream size : 6.08 GiB (100%)
Encoding settings : ae mode=full automatic / wb mode=automatic / white balance= / fcm=manual focus
Audio
ID : 0-0
Format : PCM
Muxing mode : DV
Muxing mode, more info : Muxed in Video #1
Duration : 30mn 13s
Bit rate mode : Constant
Bit rate : 1 536 Kbps
Encoded bit rate : 0 bps
Channel(s) : 2 channels
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Stream size : 332 MiB (5%)
Encoded stream size : 0.00 Byte (0%)
После сохранения
General
Complete name : D:\UVS060625-001_0001.AVI
Format : AVI
Format/Info : Audio Video Interleave
Commercial name : DV
File size : 55.8 MiB
Duration : 16s 240ms
Overall bit rate mode : Constant
Overall bit rate : 28.8 Mbps
Recorded date : 2006-06-24 15:58:06.000
Video
ID : 0
Format : DV
Duration : 16s 240ms
Bit rate mode : Constant
Bit rate : 24.4 Mbps
Encoded bit rate : 28.8 Mbps
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 4:3
Frame rate mode : Constant
Frame rate : 25.000 fps
Standard : PAL
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Interlaced
Scan order : Bottom Field First
Compression mode : Lossy
Bits/(Pixel*Frame) : 2.357
Time code of first frame : 00:24:32:18
Time code source : Subcode time code
Stream size : 55.8 MiB (100%)
Encoding settings : ae mode=full automatic / wb mode=automatic / white balance= / fcm=manual focus
Audio #1
ID : 0-0
Format : PCM
Muxing mode : DV
Muxing mode, more info : Muxed in Video #1
Duration : 16s 240ms
Bit rate mode : Constant
Bit rate : 768 Kbps
Encoded bit rate : 0 bps
Channel(s) : 2 channels
Sampling rate : 32.0 KHz
Bit depth : 12 bits
Stream size : 1.49 MiB (3%)
Encoded stream size : 0.00 Byte (0%)
Audio #2
ID : 0-1
Format : PCM
Muxing mode : DV
Muxing mode, more info : Muxed in Video #1
Duration : 16s 240ms
Bit rate mode : Constant
Bit rate : 768 Kbps
Encoded bit rate : 0 bps
Channel(s) : 2 channels
Sampling rate : 32.0 KHz
Bit depth : 12 bits
Stream size : 1.49 MiB (3%)
Encoded stream size : 0.00 Byte (0%)
Т.е. вместо одной дороги появляются две, и частота меняется с 48000 на 32000.
Уж с PCM-то не должно быть проблем вообще.