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Old 5th August 2011, 07:47   #1  |  Link
asarian
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Can x264 output a (reusable for AviSynth) uncompressed stream?

Is there a way to have x264 output a truly uncompressed stream that can be used again in AviSynth?

I need to do a 2-pass job, in which I first do the upper half (540p, with some overlap), and then the lower half of the movie. For that I need to output both streams to an uncompressed format first, so I can use a second AviSynth pass for (compressed) x264, in which I concatenate the two uncompressed output streams.

Thanks.
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Old 5th August 2011, 09:16   #2  |  Link
nm
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Use avs2yuv or VirtualDub for uncompressed output. Or encode losslessly (--qp 0) with x264 to save disk space.
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Old 5th August 2011, 10:48   #3  |  Link
asarian
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Quote:
Originally Posted by nm View Post
Use avs2yuv or VirtualDub for uncompressed output. Or encode losslessly (--qp 0) with x264 to save disk space.
Thanks!

I tried --qp 0, but I'm getting a steam that's unusable: tsMuxeR can convert it to m2ts, but eac3to can't turn it into an mkv (if I don't do the latter, FFVideoSource tells me the input stream isn't cut on packet boundaries). And both streams are entirely black on playback. :(
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Old 5th August 2011, 11:25   #4  |  Link
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If you want an mkv, make x264 output an mkv.
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Old 5th August 2011, 12:31   #5  |  Link
asarian
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Quote:
Originally Posted by J_Darnley View Post
If you want an mkv, make x264 output an mkv.
Doh on me

That worked flawlessly, btw. Even though Windows 7 doesn't seem to be able to playback the resultant lossless streams natively, it doesn't matter: x264 itself can handle the streams for input just fine. As a result, I now have a flawlessly denoised full movie!

Thanks for all your help, guys!
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Old 5th August 2011, 12:53   #6  |  Link
LoRd_MuldeR
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Lossless H.264, as implemneted in x264, uses Predictive Lossless Coding, which requires a H.264 decoder capable of the "High 4:4:4" profile

The Microsoft decoder doesn't support that profile, I guess. But libavcodec (ffdshow, FFmpegSource, etc) does! CoreAVC does too, if that matters for you.

So not really a problem, as "lossless" video is usually used for intermediate storage, which means you can simply use a supported decoder for your work.
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