Date: Thu, 28 Apr 2011 15:35:32 +0200 (CEST) From: Oliver Fromme <olli@lurza.secnetix.de> To: freebsd-multimedia@FreeBSD.ORG Subject: mplayer problem (glitches) with H.264 HD videos Message-ID: <201104281335.p3SDZWuH091427@lurza.secnetix.de>
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Hi, I've got a strange problem with mplayer that's difficult to debug. I'm not sure if it's FreeBSD-specific, but I think it is, because otherwise someone else would have noticed it, too, but Google doesn't find anything. Unfortunately I don't have a sufficiently powerful Linux machine to check. The problem only seems to occur when playing full-HD video (1080p) encoded with H.264/MPEG-4 AVC "High Profile", for example the *.m2ts files from an AVCHD structure. At certain locations in the video there's a small glitch, as if there was a bit error in the MPEG data stream. It's reproducible, i.e. it always happens at exactly the same locations. But there is no bit error. The same file can be played without any problems with ffplay, vlc and avidemux under FreeBSD, and also with VLC and some other player (I think it's Power- DVD) under Windows. Also, my hardware player (ASUS Oplay) plays it fine. Only mplayer is affected by the problem. When the glitch occurs, the following line is printed: [h264 @ 0x884f3a0]concealing 0 DC, 0 AC, 0 MV errors Sometimes -- but not always -- followed by these: [h264 @ 0x884f3a0]mmco: unref short failure [h264 @ 0x884f3a0]number of reference frames exceeds max (probably corrupt input) I'm pretty sure that the input file is not corrupt because all other players I've tried play the video fine and don't print any error messages. It must be a bug in mplayer's version of the x264 or libav libraries, or maybe something in the FreeBSD port's patches. The problem is not driver-related. The same messages are printed when I run mplayer without video output, i.e. "-vo null -ao null -nosound -benchmark". Can anybody reproduce this? I'm using a fairly recent 8-stable (i386) and the most recent port of mplayer (1.0.r20110329). The previous version of mplayer (1.0.r20101106) had exactly the same problem. I think this problem exists for a long time already. Best regards Oliver -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M. Handelsregister: Registergericht Muenchen, HRA 74606, Geschäftsfuehrung: secnetix Verwaltungsgesellsch. mbH, Handelsregister: Registergericht Mün- chen, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart FreeBSD-Dienstleistungen, -Produkte und mehr: http://www.secnetix.de/bsd PI: int f[9814],b,c=9814,g,i;long a=1e4,d,e,h; main(){for(;b=c,c-=14;i=printf("%04d",e+d/a),e=d%a) while(g=--b*2)d=h*b+a*(i?f[b]:a/5),h=d/--g,f[b]=d%g;}
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