[MPlayer-users] Creating yuv stream for encoding in Dirac with Mplayer

[Antonnio M]

Hello

You can use $ lav2yuv -f file.mpg from the mjpeg-tools

Antonio Ondas

--- $BNkCVM'Li(B <cso at katch.ne.jp> escribió: 
> Hello, i have a problem...
> 
>  How to dump raw yuv stream in yuv420? or does
> anybody have a good idea
> to convert YV12 raw stream into yuv420 ? i am using
> windows .. what i
> can use is mplayer and ffmpeg,,, and
> imageMagick..only. 
> 
> 
>  i am trying to test dirac wavelet video codec...
> (to check it really
> better than xvid or mpeg4 or not..)
> dirac needs video sources in yuv420 stream, so i
> have to convert video
> images into yuv streams..
> 
> what i tried to dump movies into raw yuv stream ..
> 
> mplayer  t.m2v -vo yuv4mpeg -vf
> format=i420,scale=720:540
> 
> Playing t.m2v.
> MPEG-ES file format detected.
> VIDEO:  MPEG2  720x480  (aspect 2)  29.970 fps 
> 6000.0 kbps (750.0 kbyte/s)
> vo_yuv4mpeg: Using (default) progressive frame mode
> Opening video filter: [scale w=720 h=540]
> Opening video filter: [format fmt=i420]
>
==========================================================================
> Opening video decoder: [mpegpes] MPEG 1/2 Video
> passthrough
> VDec: vo config request - 720 x 480 (preferred csp:
> Mpeg PES)
> Could not find matching colorspace - retrying with
> -vf scale...
> Opening video filter: [scale]
> The selected video_out device is incompatible with
> this codec.
> VDecoder init failed :(
> Opening video decoder: [libmpeg2] MPEG 1/2 Video
> decoder libmpeg2-v0.3.1
> Selected video codec: [mpeg12] vfm:libmpeg2 (MPEG 1
> or 2 (libmpeg2))
>
==========================================================================
> Audio: no sound
> Starting playback...
> VDec: vo config request - 720 x 480 (preferred csp:
> Planar YV12)
> VDec: using Planar I420 as output csp (no 1)
> Movie-Aspect is 1.33:1 - prescaling to correct movie
> aspect.
> SwScaler: reducing / aligning filtersize 1 -> 4
> SwScaler: reducing / aligning filtersize 1 -> 4
> SwScaler: reducing / aligning filtersize 5 -> 4
> SwScaler: reducing / aligning filtersize 5 -> 4
> 
> SwScaler: BICUBIC scaler, from Planar YV12 to Planar
> YV12 using MMX2
> VO: [yuv4mpeg] 720x540 => 720x540 Planar YV12
> 
> 
>   t.m2v is PAL Mpeg2 video.. and i supposed this
> command to be convert
> it to i420(yuv420) raw video stream.
>  but, messages told it as `YV12'. `-vf format=i420'
> option doesn't work
> with a option `-vo yuv4mpeg' ???
> 
>  (VO: [yuv4mpeg] 720x540 => 720x540 Planar YV12)
> 
>  so, after finished dumping.. i can't play it in
> direct..
> 
> when i typed ...
> mplayer -fps 25 -rawvideo on:size=583200:w=720:h=540
> stream.yuv
> 
> Playing stream.yuv.
>
==========================================================================
> Opening video decoder: [raw] RAW Uncompressed Video
> VDec: vo config request - 720 x 540 (preferred csp:
> Planar I420)
> VDec: using Planar I420 as output csp (no 0)
> Movie-Aspect is undefined - no prescaling applied.
> VO: [directx] 720x540 => 720x540 Planar I420
> Selected video codec: [rawi420] vfm:raw (RAW I420)
>
==========================================================================
> 
>  mplayer choose raw Uncompressed Video Decoder and
> its colour space is
> I420 ..but it wouldn't be played. i think it is in
> YV12 , not in yuv420..
> i don't know about colors spaces at all, but i have
> to get yuv
>  stream in yuv420 so that i can pass them to encode 
> `dirac_encoder -SD576 -qf 9 stream out' ..
> 
>  (i know it can be displayed with options, such as
> `y420' or `yuv2' or
> `yv12' )
> 
>  How to dump raw yuv stream in yuv420? or does
> anybody have good idea to
> convert YV12 raw stream into yuv420 ? i am using
> windows .. what i can
> use is mplayer and ffmpeg,,, and imageMagick.. 
> 
>  what i want to do is to create raw yuv stream,
> which can be played
> without specifying color space ..(is what is need to
> encode into dirac)
> 
> Please help me....
> and sorry my bad english..
> 
>  Thank you,
>  Tomonari Suzuoki
>  cso at katch.ne.jp
> 
> 
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>  


		
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