audio within Smart Cutter play mode not always in sync
Posted: Wed Oct 31, 2012 1:38 pm
Hi, in searching I didn't see any problem like this listed.
Basically, only on MP4 files generated by my camera, 720p or 1080i, the video lags the audio
in the Smart Cutter window. It starts fine but gets progressively worse, like several seconds
over 2 minutes. If the file is played outside of Smart Cutter by media player classic it is fine.
Also the file when cut by Smart Cutter is cut properly. But I need the sound to be accurate to
correctly determine the places to cut.
I wonder if the cheap JVC sd camera I have is outputting audio with unusual parameters.
Any help would be appreciated. Mediainfo of one of the files from the camera follows.
Thanks,
Mark S.
MediaInfo from JVC 1080p output
----------------------------------------
General
Complete name : C:\PIC_0214.MP4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 242 MiB
Duration : 2mn 46s
Overall bit rate mode : Variable
Overall bit rate : 12.2 Mbps
Movie name/More : JVC PICSIO
Encoded date : UTC 2012-09-30 17:32:14
Tagged date : UTC 2012-09-30 17:32:14
Origin :
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.0
Format settings, CABAC : No
Format settings, ReFrames : 2 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2mn 46s
Bit rate mode : Variable
Bit rate : 12.1 Mbps
Maximum bit rate : 16.0 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 fps
Standard : NTSC
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.195
Stream size : 240 MiB (99%)
Title : JVC H.264
Language : English
Encoded date : UTC 2012-09-30 17:32:14
Tagged date : UTC 2012-09-30 17:32:14
Color primaries : BT.709-5, BT.1361, IEC 61966-2-4, SMPTE RP177
Transfer characteristics : BT.709-5, BT.1361
Matrix coefficients : BT.709-5, BT.1361, IEC 61966-2-4 709, SMPTE RP177
Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 2mn 46s
Bit rate mode : Variable
Bit rate : 128 Kbps
Maximum bit rate : 192 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Compression mode : Lossy
Stream size : 2.59 MiB (1%)
Title : JVC AAC
Language : English
Encoded date : UTC 2012-09-30 17:32:14
Tagged date : UTC 2012-09-30 17:32:14
Material_Duration : 166187
Material_StreamSize : 2715514
Basically, only on MP4 files generated by my camera, 720p or 1080i, the video lags the audio
in the Smart Cutter window. It starts fine but gets progressively worse, like several seconds
over 2 minutes. If the file is played outside of Smart Cutter by media player classic it is fine.
Also the file when cut by Smart Cutter is cut properly. But I need the sound to be accurate to
correctly determine the places to cut.
I wonder if the cheap JVC sd camera I have is outputting audio with unusual parameters.
Any help would be appreciated. Mediainfo of one of the files from the camera follows.
Thanks,
Mark S.
MediaInfo from JVC 1080p output
----------------------------------------
General
Complete name : C:\PIC_0214.MP4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 242 MiB
Duration : 2mn 46s
Overall bit rate mode : Variable
Overall bit rate : 12.2 Mbps
Movie name/More : JVC PICSIO
Encoded date : UTC 2012-09-30 17:32:14
Tagged date : UTC 2012-09-30 17:32:14
Origin :
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.0
Format settings, CABAC : No
Format settings, ReFrames : 2 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2mn 46s
Bit rate mode : Variable
Bit rate : 12.1 Mbps
Maximum bit rate : 16.0 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 fps
Standard : NTSC
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.195
Stream size : 240 MiB (99%)
Title : JVC H.264
Language : English
Encoded date : UTC 2012-09-30 17:32:14
Tagged date : UTC 2012-09-30 17:32:14
Color primaries : BT.709-5, BT.1361, IEC 61966-2-4, SMPTE RP177
Transfer characteristics : BT.709-5, BT.1361
Matrix coefficients : BT.709-5, BT.1361, IEC 61966-2-4 709, SMPTE RP177
Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 2mn 46s
Bit rate mode : Variable
Bit rate : 128 Kbps
Maximum bit rate : 192 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Compression mode : Lossy
Stream size : 2.59 MiB (1%)
Title : JVC AAC
Language : English
Encoded date : UTC 2012-09-30 17:32:14
Tagged date : UTC 2012-09-30 17:32:14
Material_Duration : 166187
Material_StreamSize : 2715514