[vdr] Re: Problems playing NTSC-material with mplayer-plugin on FF-dvb-card

[Michal Dobrzynski <michal@appl.com.au>]

On 23/10/2004, at 7:15 AM, Harri Kukkonen wrote:

> I can't get mplayer-plugin (or is it called just MP3-plugin now?) to  
> play NTSC-based material (29.97 or 23.976 fps) on my FF DVB-card. More  
> specifically the problem is with Xvid etc. files which need to be  
> encoded into MPEG1 for the FF-card.
> Playing ntsc mpeg-files works, and also playing PAL (25fps) xvid and  
> divx files works.
> If I set NTSC="false" in mplayer.sh.conf, then the playback works  
> since everything is transformed to PAL. But I'd rather play these in  
> their original speed since my tv is NTSC-capable.
>
> Googling the issue I found just one relevant article, and even it was  
> related to mencoder:
> http://itdp.fh-biergarten.de/mplayer-users/2004-07/msg00474.html
>
> The problem obviously is with mplayer and not the plugin directly, but  
> I was hoping someone would know a way to fix this issue.
>
> Attached is the mplayer commandline that the plugin uses and the  
> relevant piece of mplayer's output.
>
> Here is some version information from my Gentoo (x86 stable) system:
> ffmpeg-0.4.7, mplayer-1.0_pre4-r7, vdr-1.3.12, MP3-plugin 0.9.7
> DVB-card is Fujitsu-Siemens DVB-C
>
> --  
> Harri Kukkonen
> hkkukkon@cc.hut.fi
> Here is the mplayer commandline that the player tries:
>
> logger: *** DEBUG: Variable CMDLINE has value "/usr/bin/mplayer -vo  
> mpegpes -ao mpegpes -vop  
> lavc=5000:29.970,expand=512:480:-1:-1:1,scale=512:480   -cache 4096  
> -slave -nolirc  -subpos 80 -sub-bg-color 0 -sub-bg-alpha 0 -quiet "
>
> And here is a snippet of the log that mplayer gives:
>
> Cache fill:  0.00% (0 bytes)    AVI file format detected.
> VIDEO:  [XVID]  512x384  16bpp  29.970 fps  946.4 kbps (115.5 kbyte/s)
> ======================================================================= 
> ===
> Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
> MP3lib: init layer2&3 finished, tables done
> AUDIO: 48000 Hz, 2 ch, 16 bit (0x10), ratio: 16000->192000 (128.0 kbit)
> Selected audio codec: [mp3] afm:mp3lib (mp3lib MPEG layer-2, layer-3)
> ======================================================================= 
> ===
> Opening /dev/dvb/adapter0/video0+audio0
> Opening video filter: [lavc=5000:29.970]
> Opening video filter: [expand w=512 h=480 x=-1 y=-1 osd=1]
> Expand: 512 x 480, -1 ; -1  (-1=autodetect) osd: 1
> Opening video filter: [scale w=512 h=480]
> ======================================================================= 
> ===
> Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
> Selected video codec: [ffodivx] vfm:ffmpeg (FFmpeg MPEG-4)
> ======================================================================= 
> ===
> Checking audio filter chain for 48000Hz/2ch/16bit ->  
> 48000Hz/2ch/16bit...
> AF_pre: af format: 2 bps, 2 ch, 48000 hz, little endian signed int
> AF_pre: 48000Hz 2ch Signed 16-bit (Little-Endian)
> AO: [mpegpes] 48000Hz 2ch Signed 16-bit (Little-Endian) (2 bps)
> Building audio filter chain for 48000Hz/2ch/16bit ->  
> 48000Hz/2ch/16bit...
> PLAYBACK STARTED
> mplayer: slave cmd: seek 2.0 1
> VDec: vo config request - 512 x 384 (preferred csp: Planar YV12)
> VDec: using Planar YV12 as output csp (no 0)
> 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 3DNOW
> [mpeg1video @ 0x847b880]removing common factors from framerate
> [mpeg1video @ 0x847b880]MPEG1/2 doesnt support 2997/100 fps
> Could not open codec.
> FATAL: Cannot initialize video driver.
>
> FATAL: Could not initialize video filters (-vf) or video output (-vo).
The problem (apparently) is a bug in ffmpeg. It supposedly can't accept  
fractional framerates. A solution (of sorts because it may in fact do  
nothing helpful) is to change the manner in which mplayer is called. It  
was suggested to me that it should not be lavc=bitrate:fps but rather  
lavc=bitrate=fps . That works in that it displays to the screen but I  
haven't had much time to work out what parameters mplayer ACTUALLY  
uses.

Good luck.

Regards,
Michal Dobrzynski