MEncoder

„MEncoder is a free command line video decoding, encoding and filtering tool released under the GNU General Public License. It is a close sibling to MPlayer and can convert all the formats that MPlayer understands into a variety of compressed and uncompressed formats using different codecs.“

MEncoder. (2008, February 23). In Wikipedia, The Free Encyclopedia. Retrieved 18:57, April 5, 2008, from
http://en.wikipedia.org/w/index.php?title=MEncoder&oldid=193447614


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Monday, April 7, 2008

Re: [MEncoder-users] mp4 audio slipping when played back in Quicktime

Jorge Peixoto de Morais Neto wrote:
> On Wed, Apr 2, 2008 at 8:21 PM, Nicolas Hesler
> <nicolas.hesler@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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