Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion. Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules. |
12th December 2010, 04:23 | #1 | Link |
Registered User
Join Date: Jul 2007
Location: Windsor-Detroit
Posts: 12
|
Audio Sync Issue
Over the course of the last 4 years, I've been converting our family video clips from Canon PowerShot A620 using AutoGK 2.55 Xvid 75% quality, auto video and audio settings. The resulting MPEG4 file has MP3 VBR audio.
GREAT! MPC-HC plays all my files flawless. I recently purchased a Seagate FreeAgent Theater+ HD medial player. I noticed that video plays choppy and lags behind the audio. After some experimenting, I finally got smooth video in perfect sync only when I encode with MP3 CBR audio (VBR was the culprit). I noticed that when I open my AutoGK-created files using Avidemux I get 2 messages: 1-Avidemux detected VBR MP3 audion in this file. For keeping audio/video in sync, time map is needed. Build it now? 2-Index is not up to date. Rebuild frame now? Despite clicking yes to both, FreeAgent plays only a second or two of the new file and stops. Maybe I'm not doing it right. It's my first day using Avidemux. Sounds like from now on, I should select CBR to ensure better support with the FAT+. Since I have nearly 500 files with VBR. Is there a way to batch process them and fix this issue? Either converting VBR to CBR or rebuilding the avi files with time maps? Here are Media Infos for a file before and after Avidemux changes: RAW file Code:
General Complete name : E:\Temp\MVI_3249.AVI Format : AVI Format/Info : Audio Video Interleave File size : 163 MiB Duration : 1mn 31s Overall bit rate : 15.0 Mbps Mastered date : FRI DEC 03 13:45:52 2010 Writing application : CanonMVI02 Video ID : 0 Format : M-JPEG Codec ID : MJPG Duration : 1mn 31s Bit rate : 14.9 Mbps Width : 640 pixels Height : 480 pixels Display aspect ratio : 4:3 Frame rate : 30.000 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 1.616 Stream size : 162 MiB (99%) Audio ID : 1 Format : PCM Format settings, Sign : Unsigned Codec ID : 1 Codec ID/Hint : Microsoft Duration : 1mn 31s Bit rate mode : Constant Bit rate : 88.2 Kbps Channel(s) : 1 channel Sampling rate : 11.024 KHz Bit depth : 8 bits Stream size : 982 KiB (1%) Interleave, duration : 991 ms (29.74 video frames) Interleave, preload duration : 1000 ms Code:
General Complete name : E:\Temp\MVI_3249_agk1.avi Format : AVI Format/Info : Audio Video Interleave File size : 46.1 MiB Duration : 1mn 31s Overall bit rate : 4 241 Kbps Writing application : VirtualDubMod 1.5.4.1 (build 2178/release) Writing library : VirtualDubMod build 2178/release Video ID : 0 Format : MPEG-4 Visual Format profile : Advanced Simple@L5 Format settings, BVOP : Yes Format settings, QPel : No Format settings, GMC : No warppoints Format settings, Matrix : Custom Codec ID : XVID Codec ID/Hint : XviD Duration : 1mn 31s Bit rate : 4 175 Kbps Width : 640 pixels Height : 480 pixels Display aspect ratio : 4:3 Frame rate : 30.000 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.453 Stream size : 45.4 MiB (98%) Writing library : XviD 1.2.1 (UTC 2008-12-04) Audio ID : 1 Format : MPEG Audio Format version : Version 2.5 Format profile : Layer 3 Codec ID : 55 Codec ID/Hint : MP3 Duration : 1mn 31s Bit rate mode : Variable Bit rate : 55.5 Kbps Nominal bit rate : 64.0 Kbps Channel(s) : 1 channel Sampling rate : 11.025 KHz Stream size : 619 KiB (1%) Alignment : Aligned on interleaves Interleave, duration : 52 ms (1.57 video frames) Interleave, preload duration : 518 ms Writing library : LAME3.98r Encoding settings : -m m -V 4 -q 2 -lowpass 5.5 --abr 64 Code:
General Complete name : E:\Temp\MVI_3249_agk1r.avi Format : AVI Format/Info : Audio Video Interleave File size : 45.5 MiB Duration : 1mn 31s Overall bit rate : 4 175 Kbps Video ID : 0 Format : MPEG-4 Visual Format profile : Advanced Simple@L5 Format settings, BVOP : Yes Format settings, QPel : No Format settings, GMC : No warppoints Format settings, Matrix : Custom Codec ID : XVID Codec ID/Hint : XviD Duration : 1mn 31s Bit rate : 4 175 Kbps Width : 640 pixels Height : 480 pixels Display aspect ratio : 4:3 Frame rate : 30.000 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.453 Stream size : 45.4 MiB (100%) Writing library : XviD 1.2.1 (UTC 2008-12-04) Audio ID : 1 Format : MPEG Audio Codec ID : 55 Codec ID/Hint : MP3 Duration : 1mn 31s Bit rate : 56.0 Kbps Channel(s) : 1 channel Sampling rate : 11.025 KHz Stream size : 625 KiB (1%) Alignment : Aligned on interleaves |
Tags |
audio, avi, cbr, sync, vbr |
Thread Tools | Search this Thread |
Display Modes | |
|
|