audio within Smart Cutter play mode not always in sync

[mskala914]

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

[admin]

Dear mskala914:
Thanks for your message.

'the video lags the audio in the Smart Cutter window. ... sound to be accurate to correctly determine the places to cut.'
Due to the frame accurate demand of H.264 video cut, we can not use DXVA playback in our product, so the video playback in Smart Cutter is not as strong as those popular video players, such as Mpc HC, Splash. Actually you could use the audio VU meter below the seek bar to help you determine the sound peak.

Please feel free to send us your further advice and suggestion.
Thank you very much.

Best Regards,
FameRing Support Team

[mskala914]

Thanks for the response. It seems that my best option may be to play the video with sound in a regular player, while turning off the sound in Smart Cutter, locating close to the same frames during pause to do the proper cuts. My main goal is avoiding re-encoding all the rest of the file, while hearing some things off
camera to cue where the cuts go (not critical down to exact frame).