lucolan uno dei file che mi ha creato problemi è questo, ti copio il rapporto di mediainfo perchè ci capisco veramente poco 
Codice:
*** MediaInfo Mac // Plain text file report
2008-12-28 11:20:40 +0100
Information for File: NOME.mkv
General / Container Stream # 1
Total Video Streams for this File -> 1
Total Audio Streams for this File -> 2
Video Codecs Used -> AVC
Audio Codecs Used -> AC3 / AC3
File Format -> Matroska
Play Time -> 1h 25mn
Total File Size -> 4.62 GiB
Total Stream BitRate -> 7 744 Kbps
Encoded with -> mkvmerge v2.0.2 ('You're My Flame') built on Jul 16 2008 20:03:58
Encoding Library -> libebml v0.7.7 + libmatroska v0.8.1
Video Stream # 1
Codec (Human Name) -> AVC
Codec (FourCC) -> V_MPEG4/ISO/AVC
Codec Profile -> High@L4.1
Frame Width -> 1 280 pixels
Frame Height -> 544 pixels
Frame Rate -> 25.000 fps
Total Frames -> 128166
Display Aspect Ratio -> 2.35
Scan Type -> Progressive
Colorimetry -> 4:2:0
Codec Settings (Summary) -> CABAC / 3 Ref Frames
QF (like Gordian Knot) -> 0.404
Codec Settings (CABAC) -> Yes
Video Stream Length -> 1h 25mn 26s 640ms
Video Stream BitRate -> 6 528 Kbps
Video Stream BitRate (Nominal) -> 7 030 Kbps
Bit Depth -> 24 bits
Video Stream Title -> NOME 720p
Video Encoder -> x264 - core 65 r998M 6768543
Video Encoder (Settings) -> cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=umh / subme=6 / psy_rd=1.0:0.0 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=2 / deadzone=21,11 / chroma_qp_offset=-2 / threads=3 / nr=0 / decimate=1 / mbaff=0 / bframes=3 / b_pyramid=0 / b_adapt=1 / b_bias=0 / direct=3 / wpredb=1 / keyint=24 / keyint_min=1 / scenecut=40(pre) / rc=2pass / bitrate=7030 / ratetol=1.0 / qcomp=0.50 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / vbv_maxrate=38000 / vbv_bufsize=30000 / ip_ratio=1.10 / pb_ratio=1.10 / aq=1:1.00
Video Stream Language -> English
Audio Stream # 1
Codec -> AC-3
Codec (FourCC) -> A_AC3
Audio Stream Length -> 1h 25mn 26s 624ms
Audio Stream BitRate -> 448 Kbps
Audio Stream BitRate Mode -> CBR
Number of Audio Channels -> 6
Audio Channel's Positions -> Front: L C R, Rear: L R, LFE
Sampling Rate -> 48.0 KHz
Audio Stream Title -> Italiano DD 5.1 @ 448Kbps
Audio Stream Language -> Italian
Audio Stream # 2
Codec -> AC-3
Codec (FourCC) -> A_AC3
Audio Stream Length -> 1h 25mn 26s 624ms
Audio Stream BitRate -> 448 Kbps
Audio Stream BitRate Mode -> CBR
Number of Audio Channels -> 6
Audio Channel's Positions -> Front: L C R, Rear: L R, LFE
Sampling Rate -> 48.0 KHz
Audio Stream Title -> English DD 5.1 @ 448 Kbps
Audio Stream Language -> English
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