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Hans
MPlayer and H264?
Posted on: 2013/2/19 22:51    #1
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This thread over at AW.net caught my attention. More specifically, this:

Quote:
Another disturbing fact I discovered was that during normal play with benchmark of the same video in 8000kbit mpeg2 format, 76% of the CPU time went into the cgx_wpa VO driver! That just has to be because of a superslow RAM->GFX speed because simple color conversion (which uses altivec btw) and copying just cannot be 3 times heavier than decoding the mpeg2 data.


That would put the RAM->VRAM transfer rate at under 130 MiB/s if it were running at 30 fps. However, the frame-rate is even lower. He estimates it at about half, which would be ~65 MiB/s. That sounds ridiculously low for an A1-X1000, so I'm wondering two things:
- What is MPlayer using to do the transfer? WritePixelArray()? Or some custom copy routine?
- Which version of the rtg.library were these tests run at? WritePixelArray() achieves ~400 MiB/s with 53.30, but only ~110 MiB/s with the older 41.4355 on the A1-X1000

If the latest rtg.library was used, then I can only conclude that MPlayer's cgx_wpa must be doing something pretty inefficient when converting YUV to RGB and copying it to VRAM.

Hans
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sofistisoftware
Re: MPlayer and H264?
Posted on: 2013/2/20 13:53    #2
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Strange nobody has interest in it ! It's a very important thing to argue among developers, it could bring us a faster video player closer to our operating system and take advantage to amiga os4 features
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kas1e
Re: MPlayer and H264?
Posted on: 2013/2/20 16:16    #3
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@Hans

I assume its all about muimplayer port from Fab ? Because as far as i know only Fab one have and cgx, and p96 drivers, while old mplayer have only p96 ones.

If so, then relevant part of drivers and video output here:

video_out and cgx_common : general ones
vo_cgx_wpa - cgx driver
vo_p96pip* - p96 driver which i just get from old mplayer and a bit adapt
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Hans
Re: MPlayer and H264?
Posted on: 2013/2/20 20:09    #4
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@kas1e
Quote:

kas1e wrote:
@Hans

video_out and cgx_common : general ones
vo_cgx_wpa - cgx driver
vo_p96pip* - p96 driver which i just get from old mplayer and a bit adapt


It seems a pretty safe bet that it's the MUI MPlayer. Looking at the cgx_wpa code, it is using WritePixelArray(). So, that brings me to the second question that I asked: which rtg.library version was it tested with?

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Antique
Re: MPlayer and H264?
Posted on: 2013/2/20 20:59    #5
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How can one find out what version was out at a certain time? Seing that the post was made on 16.december last year.I believe there has been released a newer one after that? Or am i way off?

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Hans
Re: MPlayer and H264?
Posted on: 2013/2/20 21:43    #6
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@Antique

Quote:

Antique wrote:
How can one find out what version was out at a certain time? Seing that the post was made on 16.december last year.I believe there has been released a newer one after that? Or am i way off?


In a shell window, enter:
version rtg.library


IIRC, version 53.30 was released via AmiUpdate shortly after Deniil started that thread. So, you're right that he was probably using version 41.4355. It would be interesting to see whatever tests he did repeated with the latest version.


Hans
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Deniil
Re: MPlayer and H264?
Posted on: 2013/2/20 21:51    #7
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I am using rtg.library 41.4355 (2011-07-14).
I'll do an update and test again

Edit: Except I can't because AmiUpdate crashes
Edit2: Ok, managed to update but I honestly can't see any difference what so ever on the border-line videos. I will test with the benchmark when I get time.


Edited by Deniil on 2013/2/20 22:46:21
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Hans
Re: MPlayer and H264?
Posted on: 2013/2/22 0:24    #8
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Quote:

Deniil wrote:
Edit2: Ok, managed to update but I honestly can't see any difference what so ever on the border-line videos. I will test with the benchmark when I get time.


Let's see what the benchmarks say. If it makes no real difference, then the bottleneck isn't the RAM => VRAM transfer operation.

EDIT: BTW, which version of MPlayer are you using for the tests? There may be versions that use an experimental custom RAM => VRAM copy routine that doesn't use WritePixelArray() floating around.

Hans


Edited by Hans on 2013/2/22 7:14:48
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Deniil
Re: MPlayer and H264?
Posted on: 2013/2/24 13:01    #9
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@Hans

I'm using MPlayer UNKNOWN-4.4.3 (C) 2000-2010 MPlayer Team (MUI-MPlayer for OS4).

Now I just tried the benchmark again and it was pretty much the same:
MPeg-2:
Quote:

Playing Storage:Video-Downhill/2012_Are-Bike-Festival-hi8.mpg.
MPEG-PS file format detected.
VIDEO: MPEG2 1280x720 (aspect 1) 29.970 fps 8000.0 kbps ( 0.0 kbyte/s)
VO: [cgx_wpa] Welcome man !.
Opening video filter: [screenshot]
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffmpeg2] vfm: ffmpeg (FFmpeg MPEG-2)
==========================================================================
Audio: no sound
Starting playback...
Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
[swscaler @ 0x4cdaf840]ALTIVEC: Color Space RGB24
[swscaler @ 0x4cdaf840]using unscaled yuv420p -> rgb24 special converter
VO: [cgx_wpa] 1280x720 => 1280x720 Planar YV12
VO: Disabling blanker
[swscaler @ 0x4cdaf840]ALTIVEC: Color Space RGB24


BENCHMARKs: VC: 5.056s VO: 17.004s A: 0.000s Sys: 0.405s = 22.466s
BENCHMARK%: VC: 22.5068% VO: 75.6895% A: 0.0000% Sys: 1.8037% = 100.0000%
VO: Enabling blanker

Exiting... (End of file)


Same clip with original H264 codec cut and muxed into AVI:
Quote:

Playing Storage:Video-Downhill/2012_Are-Bike-Festival-HD-music.avi.
AVI file format detected.
[aviheader] Video stream found, -vid 0
[aviheader] Audio stream found, -aid 1
VIDEO: [H264] 1280x720 24bpp 29.970 fps 10609.1 kbps (1295.1 kbyte/s)
Clip info:
Software: Lavf52.64.2
VO: [cgx_wpa] Welcome man !.
Opening video filter: [screenshot]
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
==========================================================================
Audio: no sound
Starting playback...
Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
[swscaler @ 0x4cdaf840]ALTIVEC: Color Space RGB24
[swscaler @ 0x4cdaf840]using unscaled yuv420p -> rgb24 special converter
VO: [cgx_wpa] 1280x720 => 1280x720 Planar YV12
VO: Disabling blanker
[swscaler @ 0x4cdaf840]ALTIVEC: Color Space RGB24


BENCHMARKs: VC: 25.144s VO: 14.245s A: 0.000s Sys: 0.240s = 39.629s
BENCHMARK%: VC: 63.4474% VO: 35.9462% A: 0.0000% Sys: 0.6064% = 100.0000%
VO: Enabling blanker

Exiting... (End of file)
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Hans
Re: MPlayer and H264?
Posted on: 2013/2/24 19:42    #10
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Quote:

Deniil wrote:
@Hans

I'm using MPlayer UNKNOWN-4.4.3 (C) 2000-2010 MPlayer Team (MUI-MPlayer for OS4).

Now I just tried the benchmark again and it was pretty much the same

That suggests that the RAM => VRAM transfer isn't the bottleneck. Or, maybe it's not using WritePixelArray() after all.

Could you try again with the -noaspect option? It's possible that MPlayer is rescaling the image, which is likely slow.

NOTE: I don't know if the -noaspect option actually works; I've seen suggestions that it doesn't do anything. It's still worth trying, though.

Hans
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Thematic
Re: MPlayer and H264?
Posted on: 2013/2/24 21:23    #11
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It works. MPlayer reports these things even when there is no scaling necessary nor applied.
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Deniil
Re: MPlayer and H264?
Posted on: 2013/2/27 20:45    #12
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@Hans

If you see this line:
[swscaler @ 0x4cdaf840]using unscaled yuv420p -> rgb24 special converter

I'm pretty sure it doesn't scale because it fits perfectly on a 1280x720 screen, and there is no way to even force it to scale without overlay. I have many clips I'd like to scale up but it refuses.
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Hans
Re: MPlayer and H264?
Posted on: 2013/2/27 22:00    #13
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Quote:

Deniil wrote:
@Hans

If you see this line:
[swscaler @ 0x4cdaf840]using unscaled yuv420p -> rgb24 special converter

I'm pretty sure it doesn't scale because it fits perfectly on a 1280x720 screen, and there is no way to even force it to scale without overlay. I have many clips I'd like to scale up but it refuses.

It's best not to make any assumptions. Have a look at part of the cgx_wpa code:

static int draw_slice(uint8_t *image[], int stride[], int w,int h,int x,int y)
{
#if 1
    uint8_t *dst[3];
  int dstStride[3];

    dstStride[0] = window_width*image_bpp;
    dstStride[1] = 0;
    dstStride[2] = 0;

    dst[0] = (uint8_t *) ( (ULONG) image_buffer +x*image_bpp) ;
    dst[1] = NULL;
    dst[2] = NULL; 

    sws_scale_ordered(swsContext, 
            image,
            stride,
            y + internal_offset_y,
            h,
            dst, 
            dstStride);
#else
    w -= (w%2);
    yuv2rgb( (UBYTE *) ( (ULONG) image_buffer + (y*image_width+x)*image_bpp) , image[0], image[1], image[2],\
                                     w, h, image_width*image_bpp,
                                     image_width, image_width/2 );
#endif
    return 0;
}


Note the use of a function called sws_scale_ordered(). I have no idea if this does or doesn't make a difference. However, all I can say is that the performance benchmark doesn't stack up with what the RAM => VRAM speed should be, even when taking into account the YUV => RGB conversion.

My main point is that you have no idea what MPlayer is actually doing behind the scenes. Did you try the -noaspect option?

Hans
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Deniil
Re: MPlayer and H264?
Posted on: 2013/2/28 12:22    #14
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@Hans

Haven't tried the -noaspect switch yet but will do when I get home.

Another annoying this I noticed with the cgx_wpa driver is that it can't handle 852x480 without inverting colours. 854 works though. Too bad I'm too borded and lazy to set up and compile it myself...
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