Re: Digicam-Video: Skipping frame bei Audio bewirkt Stille am Ende > 1 min.
Maik Holtkamp <[email protected]>
| Newsgroups | gmane.linux.suse.multimedia.german |
|---|---|
| Message-ID | <[email protected]> |
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Hi,
0n 10/02/12@12:32 Al Bogner told me:
...
> mencoder -ovc x264 -x264encopts qp=28:threads=auto:pass=1 \
...
> --------------------------------------------------
> Mencoder 2. Durchgang
> --------------------------------------------------
...
> VIDEO: [MJPG] 640x480 24bpp 30.000 fps 6815.3 kbps (831.9 kbyte/s)
^^^^
> Selected video codec: [ffmjpeg] vfm: ffmpeg (FFmpeg MJPEG)
^^^^^
Das scheint mir aber kein x264 zu sein, was mencoder da gebaut hat,
oder?
Habe keine Erfahrung mit x264 encoding, aber ich lass diese Tage
gerade:
- ---cut---
From: Phil Ehrens <[email protected]>
Subject: Re: [transcode-users] h.264 tips?
Date: Mon, 1 Feb 2010 08:26:56 -0800
To: transcode Users Mailing List <[email protected]>
I put the Who? in Mishehu wrote:
>
> I would like to use transcode to encode this file into a matroska
> (mkvu)container with h.264 as the video codec and a direct copy of
> the
> audio (no transcoding of the a52 stream). There are three options
> that
> I know of so far:
>
> 1. Use transcode selecting x264 as the video codec for -y
> 2. Use transcode specifying ffmpeg as the backend
> 3. Directly using ffmpeg and skipping the use of transcode.
>
> I would like to try 2-pass encoding for best overall quality. The
> expense of encoding time is of no real consequence to me, as I can
> simply batch these up and run them overnight.
According to the x264 developers, 2-pass is non-functional
in x264. The passlog file, according to them, contains only
null entries. There is some sort of aggressive lookahead
option for x264 called cpb or something (I don't do x264)
that they CLAIM does as good as 2-pass but in a single pass.
My own observations of many people's encodes indicate that
it is easy to do a high-quality encode with x264 that is
not as good as a high-quality encode done with lavc mpeg4.
A real expert however can do a mind-bogglingly great
encode with x264. If your content has any high-action, check
the results with x264 carefully, because that's where it
falls down (and that's exactly where lavc 2-pass shines).
- ---cut---
das 2-pass da wohl eh kaput ist.
- --
bye maik
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