[MEncoder-users] mp4 audio slipping when played back in Quicktime
nicolas.hesler at sheridanc.on.ca
Mon Apr 7 14:56:18 CEST 2008
Jorge Peixoto de Morais Neto wrote:
> On Wed, Apr 2, 2008 at 8:21 PM, Nicolas Hesler
> <nicolas.hesler at sheridanc.on.ca> wrote:
>> I've successfully created an MP4 with mencoder using the following command line. The file plays back normally using VLC but when played back in Quicktime, the audio slips by a couple of frames after about a minute. Any idea why this might be happening and how I might be change my command line options to make Quicktime happy?
>> Note: I'm frameserving from Premiere and so my source should not inherently have a sync issue. (or so i assume)
>> and my video source is only about a minute long, so the slippage is noticeable by the end of the video.
>> mencoder -of lavf -sws 9 -lavfopts format=mp4 -vf dsize=1280:720:0,scale=0:0,expand=1280:720,harddup -ovc x264 -x264encopts bitrate=5000:qcomp=0.7:qp_min=1:direct_pred=auto:keyint=48:partitions=all:me=umh:subq=7:frameref=8:trellis=2:global_header:pass=1:psnr -oac faac -faacopts mpeg=4:object=2:br=224:raw -channels 2 -srate 48000
> 1) Try encoding to .avi and then using an external tool for muxing to mp4
> 2) Why qp_min=1?
> 3) Why these faacopts?
Does anyone have an answer for why Quicktime might be having an A/V sync
issue where other media players do not?
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