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Posted: 8/1/2011 10:18 PM
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Santiago
Joined: 7/29/2011
Posts: 61
@Warp, fair enough, give me an example of an obscure standardized codec that can compete with Mpeg 4 AVC quality. @sgrunt, I produced a sine wave to match the duration of my Ninja Gaiden test video, encoded and packed with the video. When I opened it via directshowsource with Avisynth and extracted the audio, there was a weird pre-echo of sine and then silence at the beginning with a total length of 59 ms and 22 ms of silence at the end of the file, when truncated the audio track would be at its original length. It looks like you werent full of it after all. Interesting. Could this be corrected on the ffdshow audio decoder by adding 59 ms delay? Not that its a big deal anyway. I cant notice the subtle delay.
Posted: 8/1/2011 10:21 PM
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sgrunt
He/Him
Emulator Coder, Former player
Joined: 10/28/2007
Posts: 1360
Location: The dark horror in the back of your mind
Actually, what you'd need to do is truncate that length of audio from the beginning of the file (normally, the first part of audio is silence anyway, particularly where we have our ~2 second encoder logos attached); the encoder then introduces the delay to have the audio start at the correct time.
Posted: 8/2/2011 12:41 AM
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Santiago
Joined: 7/29/2011
Posts: 61
I see. Its too bad that you cant set a negative delay on ffdshow audio decoder. Why is there a limit to decimate only 20 frames though, it should be 60. Is it possible to Dedup a video twice?
Posted: 8/2/2011 1:06 PM
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Flygon
Joined: 11/4/2007
Posts: 1772
Location: Australia, Victoria
It's not possible to DeDup a video twice. The limitation is there due to limitations in the plugin we use. We could DeDup even more video frames, but personally, I don't think it's a good idea (it has very severe seeking side effects with some players, and necessitates lowering the keyint to compensate).
Posted: 8/2/2011 1:35 PM
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Warp
Banned User
Joined: 3/10/2004
Posts: 7698
Location: Finland
Santiago wrote:
@Warp, fair enough, give me an example of an obscure standardized codec that can compete with Mpeg 4 AVC quality.
You are missing the point. Please reread what I wrote you the first time.
Posted: 8/2/2011 1:50 PM
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sgrunt
He/Him
Emulator Coder, Former player
Joined: 10/28/2007
Posts: 1360
Location: The dark horror in the back of your mind
Flygon wrote:
It's not possible to DeDup a video twice.
Actually, surprisingly, it is possible - you just need to pass DeDup the timecodes file you generated in the first round as the "timesin" parameter to generate a correct timecodes file as output I don't recommend going much beyond the usual limit DeDup sets, however, on the basis of diminishing returns from a file size perspective - very few segments in the clips we normally work with will have very large numbers of consecutive duplicate frames - and from a usability perspective, as removing too many duplicate frames affects seekability in the resulting encode.
Posted: 8/2/2011 3:49 PM
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Santiago
Joined: 7/29/2011
Posts: 61
@Warp, I heard your original point, which was that non-standard codecs arent necessarily worse than standard and that there probably is an obscure crappy codec that you might find in the ISO database (i would like to see it?) Again I would have to disagree, considering that non-standard codecs are almost always made by amateurs with a jaded perspective on wanting to prove how it doesn't take a professional/authority to create a good product or "rebelling against the system". But the bottom line is that the quality of non-standard codecs vs. standard is inferior. AAC is better than Vorbis at the same bitrate, and x264 I dont think I have to prove to you guys that it kicks the crap out of even the best non-standard video codec out there. @sgrunt, can you provide more details? I do not plan to use Dedup twice or even Dedup at all for any serious purpose, i'm just experimenting so I can update my journal. I have kept track and always anxiously awaited the next best codec since 2002 when videos were really large but really low quality and would take forever to download. H264 certainly was the true triumph that I have long waited for. Little did I know that people would be so f**ing change-resistant and that 8 years after the codec is released people would still knowingly and willingly use old, outdated codec for no other reason besides that they are retards. You guys on the other hand always look out for the cutting edge technology out there. Thats why I like you and visit here every now and then. I didnt know about Dedup before but it certainly does look like the next step for better quality, for animation at least, I dont know about real life movies.
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