[mythtv-users] Mythvideo: Internal Player, mplayer or Xine which is prefered?
Jon Boehm
boehm100 at comcast.net
Thu Aug 16 02:40:11 UTC 2007
Tom,
It looks like xine uses the DScale open source library to do this. I
found some good documentation here:
http://deinterlace.sourceforge.net/Help/
Jon
Tom Dexter wrote:
>> From: Jon Boehm
>>
>> Tom Dexter wrote:
>>> I use xine for just about everything. I have wmv files set to use
>> mplayer,
>>> thought I virtually never watch them in mythtv. I've experimented a
>> little
>>> with mkv files and mplayer seems to handle some that xine won't.
>>>
>>> I'm running mythtv 0.20.1 and I'm sure the internal player in SVN is
>> much
>>> better than what I have. xine just supports so many codecs and formats.
>>>
>>> I know you didn't specifically ask about DVDs, but I use xine for DVDs
>> as
>>> well as VIDEO_TS, iso, and img DVDs. One big advantage of this is being
>>> able to use the tvtime deinterlace post processing. When I first
>> started
>>> watching DVDs in mythtv, I noticed that some DVDs had some pretty nasty
>>> tearing issues especially during panning no matter what player I used.
>>> After enabling post processing with the tvtime deinterlace plugin in
>> xine,
>>> all those issues went away and my DVD playback always looks simply
>> amazing.
>>> The command I have set up for DVD playback is:
>>>
>>> xine --post tvtime -pfhq dvd:/%d
>>>
>>> ...and for the file types VIDEO_TS, iso, and img:
>>>
>>> xine --post tvtime -pfhq dvd:/%s
>>>
>>> Then, in my /home/mythtv/.xine/config file I have:
>>>
>>> gui.post_plugins.deinterlace:tvtime:method=GreedyH
>>>
>>> ...which sets the deinterlace method to GreedyH and leaves all other
>> options
>>> at the defaults, which apparently are:
>>>
>>> cheap_mode=1,pulldown=0,use_progressive_frame_flag=1
>>>
>>> The only place I've seen those options documented thoroughly is in the
>> gui
>>> of gxine, which I find pretty odd. Anyway...the DVD playback I get with
>>> that output at 1080i to my TV (a Hitachi RC CRT) is noticably better
>> than
>>> any DVD player I've owned.
>>>
>>> Tom
>> Tom,
>>
>> Wow, thats some really great info. Where did you find out about the
>> tvtime post processing in xine?
>>
>> I found this page to have some really great info too.
>> http://knoppmythwiki.org/index.php?page=XineDVDHowTo
>>
>> Thanks,
>> Jon
>>
>
> I happened to notice the tvtime deinterlacing stuff in gxine and that
> started me looking into it. There's choice little about it I'll tell you.
> Like I said...the only detailed info on the tvtime plugin settings I can
> find are in the gxine gui. I'll paste it into the end of this email.
>
> I tried several methods, but that GreedyH seems to work just great for
> me...it really does look like a very high-end DVD player. Apparently,
> setting the deinterlacing method directly (as apposed to setting it with a
> post processing plugin) is depricated. Also note that the default entry of
> 1 for use_progressive_frame_flag mens (I think) that it won't deinterlace if
> it detects the progressive frame flag.
>
> Tom
> --------------------------------------------------------------------------------------------------------------------------------
> Parameters for tvtime plugin:
> --------------------------------------------------------------------------------------------------------------------------------
> Advanced tvtime/deinterlacer plugin with pulldown detection
> This plugin aims to provide deinterlacing mechanisms comparable to high
> quality progressive DVD players and so called line-doublers, for use with
> computer monitors, projectors and other progressive display devices.
>
> Parameters
>
> Method: Select deinterlacing method/algorithm to use, see below for
> explanation of each method.
>
> Enabled: Enable/disable the plugin.
>
> Pulldown: Choose the 2-3 pulldown detection algorithm. 24 FPS films that
> have being converted to NTSC can be detected and intelligently reconstructed
> to their original (non-interlaced) frames.
>
> Framerate_mode: Selecting 'full' will deinterlace every field to an unique
> frame for television quality and beyond. This feature will effetively double
> the frame rate, improving smoothness. Note, however, that full 59.94 FPS is
> not possible with plain 2.4 Linux kernel (that use a timer interrupt
> frequency of 100Hz). Newer RedHat and 2.6 kernels use higher HZ settings
> (512 and 1000, respectively) and should work fine.
>
> Judder_correction: Once 2-3 pulldown is enabled and a film material is
> detected, it is possible to reduce the frame rate to original rate used (24
> FPS). This will make the frames evenly spaced in time, matching the speed
> they were shot and eliminating the judder effect.
>
> Use_progressive_frame_flag: Well mastered MPEG2 streams uses a flag to
> indicate progressive material. This setting control whether we trust this
> flag or not (some rare and buggy mpeg2 streams set it wrong).
>
> Chroma_filter: DVD/MPEG2 use an interlaced image format that has a very
> poor vertical chroma resolution. Upsampling the chroma for purposes of
> deinterlacing may cause some artifacts to occur (eg. color stripes). Use
> this option to blur the chroma vertically after deinterlacing to remove the
> artifacts. Warning: cpu intensive.
>
> Cheap_mode: This will skip the expensive YV12->YUY2 image conversion,
> tricking tvtime/dscaler routines like if they were still handling YUY2
> images. Of course, this is not correct, not all pixels will be evaluated by
> the algorithms to decide the regions to deinterlace and chroma will be
> processed separately. Nevertheless, it allows people with not so fast
> systems to try deinterlace algorithms, in a tradeoff between quality and cpu
> usage.
>
> * Uses several algorithms from tvtime and dscaler projects.
> Deinterlacing methods: (Not all methods are available for all plataforms)
>
> [Linear] Linear Interpolation:
> Expands each field independently without blurring or copying in time. Use
> this if you want TV-quality with low CPU, and you have configured your
> monitor to run at the refresh rate of the video signal.
>
> Full resolution mode expands each field to full size for high quality
> fullscreen use.
> ---
> [LinearBlend] Linear Blend (mplayer):
> Avoids flicker by blurring consecutive frames of input. Use this if you
> want to run your monitor at an arbitrary refresh rate and not use much CPU,
> and are willing to sacrifice detail.
>
> Temporal mode evenly blurs content for least flicker, but with visible
> trails on fast motion. From the linear blend deinterlacer in mplayer.
> ---
> [Greedy] Greedy - Low motion (DScaler):
> Uses heuristics to detect motion in the input frames and reconstruct image
> detail where possible. Use this for high quality output even on monitors
> set to an arbitrary refresh rate.
>
> Simple detection uses linear interpolation where motion is detected, using a
> two-field buffer. This is the Greedy: Low Motion deinterlacer from DScaler.
> ---
> [Greedy2Frame] Greedy 2-frame (DScaler):
>
> ---
> [Weave] Weave Last Field:
> Only updates the most recent field.
> ---
> [LineDoubler] Line Doubler:
>
> ---
> [Vertical] Vertical Blend (ffmpeg):
>
> Avoids flicker by blurring consecutive frames of
> input. Use this if you want to run your monitor at an arbitrary refresh
> rate and not use much CPU, and are willing to sacrifice detail.
>
> Vertical mode blurs favouring the most recent field for less visible trails.
> From the deinterlacer filter in ffmpeg.
> ---
> [ScalerBob] Scaler Bob:
>
> Expands each field independently without blurring
> or copying in time. Use this if you want TV-quality with low CPU, and you
> have configured your monitor to run at the refresh rate of the video signal.
>
> Half resolution is poor quality but low CPU requirements for watching in a
> small window.
> ---
> [GreedyH] Greedy - High Motion (DScaler):
>
> Uses heuristics to detect motion in the input
> frames and reconstruct image detail where possible. Use this for high
> quality output even on monitors set to an arbitrary refresh rate.
>
> Advanced detection uses linear interpolation where motion is detected, using
> a four-field buffer. This is the Greedy: High Motion deinterlacer from
> DScaler.
> ---
> [TomsMoComp] Tom's Motion Compensated (DScaler):
>
> Uses heuristics to detect motion in the input
> frames and reconstruct image detail where possible. Use this for high
> quality output even on monitors set to an arbitrary refresh rate.
>
> Motion search mode finds and follows motion vectors for accurate
> interpolation. This is the TomsMoComp deinterlacer from DScaler.
> ---
>
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