I was using a media player that read xvid encoded videos, so I used avidemux to encode all my videos to avi. In general, I encoded using two-pass with an average bitrate of 1500kbps.
I have now gotten an iPhone, and I'd like to use avidemux to convert all avi my videos to mp4 encoded with H264. I've read that H264 has a better compression algorithm and I can get the same quality at lower bitrates, so if I encode using two-pass, what average bitrate should I use to mantain similar quality in my videos?
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Ok, thanks. Is there anyway then to determine the quality of my avi files? I just don't want to set the quality unnecessarily high.
In avidemux I can set for quality either constant rate factor or constant quantiser, and the value between 0(high quality) and 51(low quality). Is there a value that's standard for DVD quality? -
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Handbrake is great. When I transcode AVI to H264 I simply use the same filesize and set the audio bitrates to match. I end up with about the same video bitrate and the quality is fine. One possible bug in Handbrake: Be sure to set the proper framerate; don't rely upon "same as source" as I've seen a number of conversions produce jerky results; when I manually set the framerate to match the source, I don't have any problems.
Last edited by rumplestiltskin; 18th Oct 2010 at 11:29. Reason: clarification
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Try roughly a 1/3 less bitrate. Maybe 800Kb/s for H.264 compared to 1500Kb/s for Xvid and see how it looks.
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So If I have a h264 video file at about 850kbps to keep similar quality in Xvid I'd be looking at encoding the Xvid at a third higher bitrate (about 1133kbps). Is that correct?
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If you buy MediaPlayerPro ($1.99USD) app, it will NATIVELY play Divx/Xvid AVIs, MKVs, etc on your iPhone (iOS v4.3 or later) - no conversion needed!
Scott -
So If I have a h264 video file at about 850kbps to keep similar quality in Xvid I'd be looking at encoding the Xvid at a third higher bitrate (about 1133kbps). Is that correct?
If you reencode the Xvid encode you will lose quality, since the encoding with Xvid (probably) introduced (a lot) new artifacts, which for the encoder will be new details and thus the 'same source' criteria is gone.
(The other way around reencoding a H.264 file, you also do not have the same source, so simply using 1/3 more bitrate will not produce the same quality.) -
If you buy MediaPlayerPro ($1.99USD) app, it will NATIVELY play Divx/Xvid AVIs, MKVs, etc on your iPhone (iOS v4.3 or later) - no conversion needed!
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