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MPEG-4 poor encoding quality
Videocentricity
Contributor Location: Long Beach,CA Joined: May 21, 2007 05:37 Messages: 394 Offline
[Post New]
Excellent answer.
In fact <blush> I still use PDR9 most days even though I have pDR11 around.
So I had created a profile Gyaes the other night but cannot see how to edit any of the values.

Following your reply I searched the drive for profile.ini and found this below. I assume editing it manually will produce the desired bitrate/video dimensions etc
Will advise later when i get the chance to sit down.

Thanks for all your time,
Ron

&
<Class>MPEG-4 AVC
<Name>Gyaes
<Description>
Custom Profile -1Gyaes
<Output FileName>
<DescID>11922
<NameID>11923
<Group>2
<File Format Class>11
<Video Format Class>8
<Audio Format Class>10
<Stream Flag>3
<Field Order>0
<Attribute>40083
<Video BitRate>9000000
<Min BitRate>0
<Max BitRate>0
<Video Quality>0
<Video Width>1280
<Video Height>720
<Frame Rate>29.969999
<Profile Level>65357
<Pattern>IBPBPBPBPBPBPBPBPBPBPBPBPBPBP
<Pre Processing>0
<Resize>1
<Flip Video>0
<Speed Quality Indicator>6
<Interlacing>0
<Encoder Mode>0
<App Type>2
<Dynamic GOP>0
<Deblock>1
<EntryMode>1
<Encoder Type>32
<Audio Layer>2
<Audio Mode>2
<Audio BitRate>192000
<Audio Channels>2
<Audio SamplesPerSec>1
<Audio BitsPerSample>1
<Misc>0
<SamplesPerFrame>0
&&
If you can't solve the problem - Change the problem
Videocentricity
Contributor Location: Long Beach,CA Joined: May 21, 2007 05:37 Messages: 394 Offline
[Post New]
Most excellent !
I edited the profile and converted a video which was 86Mb originally and now is just 33Mb with barely any reduction in quality, which is just what I was looking for. I might even try a profile down around 400kbps which could halve it again, very useful for lower bandwidth users (BTinternet ahem!) I am on a foggy hillside with a bit of damp twisted copper 12 miles from any glassfiber junction, and a 7Mb download speed.

ORIGINAL
86Mb
1280x720
29fps
2.05mbps

CONVERTED
33Mb
720x480
29fps
715kbps


I cannot thank you enough for the info about profile.ini though I still wonder how it is meant to be edited other than using Notepad. Lastly, can you tell me about these Pixelan plugins - do you have a favorite which gets employed often? If you can't solve the problem - Change the problem
Videocentricity
Contributor Location: Long Beach,CA Joined: May 21, 2007 05:37 Messages: 394 Offline
[Post New]
FYI, I made a new profile differing only in that the bitrate was now 363kbs
I tested a 48.3Mb source created using my first custom profile and ran it through again in profile #2
This time it saved as 29.7Mb and was still in my opinion excellent for full screen web delivery.

The original mpeg made in my PDR was 287 Mb and I had been converting it to 53Mb FLV to put on my web server, now I am playing MP4, some using HTML5 code and some using the same flowplayer as for flv for browsers which don't yet support html5


both items saved as H264 avc

48.3Mb
716kbs
720x480

29.7Mb
363kbs
720x480

[Final note, 3rd profile of 98kbs bitrate produced bad noise e.g. noticeable yellow Star Wars scrolling titling (using PDR titles) at an output size of 15Mb, where the black edges of the letters got chewed up ]

This message was edited 3 times. Last update was at Dec 12. 2014 12:51

If you can't solve the problem - Change the problem
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