Mencoder using libavcodec to encode ac3 produces slow video

Hi,
I use ps3mediaserver as dlna server and it encodes using mencoder with the following options:
mencoder -ss 0 -quiet /home/user/data/temp/video1.mp4 -quiet -quiet -oac lavc -of mpeg -quiet -quiet -mpegopts format=mpeg2:muxrate=500000:vbuf_size=1194:abuf_size=64 -ovc lavc -channels 2 -lavdopts debug=0:threads=4 -lavcopts autoaspect=1:vcodec=mpeg2video:acodec=ac3:abitrate=256:threads=4:keyint=1:vqscale=1:vqmin=2:vrc_maxrate=30000:vrc_buf_size=1835 -ass-color ffffff00 -ass-border-color 00000000 -ass-font-scale 1.0 -ass-force-style FontName=Arial,Outline=1,Shadow=1,MarginV=10 -quiet -quiet -subdelay 20000 -quiet -quiet -ofps 24000/1001 -quiet -quiet -mc 0.1 -quiet -af lavcresample=48000 -srate 48000 -o /tmp/javaps3media/mencoder1301695142450
where video1.mp4 has mov container, aac audio and h264 720p video, a typical hd video.
If I change the acodec=ac3 to acodec=libmp3lame everything works like a charm.
Any idea why ac3 is so buggy?

Hello, thanks for your reply.
>>"HD clips totalled no more than 320 MB!"
>That's some massive compression going on there. mp4?
The source is an iPhone 4.
I should point out that I am not a huge fan of QT but I was simply attempting to output in the same(?) format as the source. The source is three very important impromptu videos of the final hours of my wife's grandfather singing a song. My intention is to combine them into a single video to upload to YouTube private video site.
One of the videos was taken vertically and flipping it horizontally is normally pretty easy and very good quality in Pinnicle Studio but like I previously stated, Premiere did a horrible job.
At this time, all I have is CS4 with Premiere and I thought it would turn out a lot better than this. Can you recommend a better output CODEC and associate settings?
Ty

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Dialogue Normalization is a funny old setting - it actually refers to the amount of attenuation applied to the audio source with -31db meaning no attenuation, which should mean that the volume of the audio is preserved throughout the compression process.
There's a lot more to this, of course, have a look here for some plain explanations:
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What is the encoding video bitrate? If you don't know or can't answer that, then you sure as heck should not be encoding a 1920x1080 video.
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OK, that would mean that a video bitrate of half that should usually provide a video download that is not interupped by buffering (most of the time anyway). So assuming a video bitrate of 750kbps, what would the optimum display dimensions be?
Before we decide, here's a little info about bitrate. For highest quality playback, the video bitrate is tied directly to the display dimensions. That is, the larger the display, the more incoming data is required to properly display the video. Think of bitrate in terms of a can of paint. If you have 1 quart of paint, you might be able to do a very nice job on a 32 X 24 foot area. But if you try to stretch that same amount of paint out over a 64 X 48 foot area, the coverage will not be nearly as good and you get poor results.
In the same way, a video displayed at 640 X 480 pixels will require 4 times the bitrate as a video displayed at 320 X 240 pixels to produce the same quality. So for example a video with a bitrate of 100kbps, displayed at 160 X 120 will produce the same quality results as a video with a bitrate of 1600kbps if displayed at 640 X 480.
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As for framerate, maintain the original raw video framerate for best results. So if the video was shot at 24fps, leave it.
As for video converters, do you have the Flash 8 Video Converter? It works just fine for video to be delivered over the Internet. Remember, you are taking a Cadillac version of video (h.264 HD) and stuffing it into a Chevy body to get it to work over the Internet.
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Frank VA wrote:
You guys fighting mp4 as a standard, forcing us to an additional product, or what?
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Frank VA wrote:
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