Hmm where to ask...my tv is a plasma with 2 usb inputs. When I watch HD 1.5 gig mkv/avi/mp4 files there's no problem but sometimes audio is out of sync after ff or rewinding..and it's always an mp4 file. Is it differences in how they are encoded? Can I run a header fix instead of a re-encoding.
Of course on the computer there's no playback problems. My plasma model is 2010 Samsung PN58C550G1FXZA
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If you don't have problems with MKVs as a rule, try remuxing a problem MP4 as an MKV with MKVMergeGUI (no re-encoding). If the issue is something like a variable frame rate as Baldrick suggested, remuxing probably won't help, but if the TV just doesn't play nicely with MP4 files it probably will. MKVMerge will open quite a few different file types and remux them as MKV. MKVMergeGUI makes working with MKVs pretty easy... deleting unwanted streams, replacing audio.... that sort of thing.
I have a Samsung Plasma of around the same vintage. I dislike MP4 anyway, and I mostly remux them as MKV before playing them, so I can't really comment on how well my TV plays MP4 files.
Thanks for the help! It does have variable frame rate. I used to read and apply all knowledge from this site almost 10 years ago. Lot's changed since then. Everything is all h264/mkv etc, etc now...
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L4.0
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2h 59mn
Bit rate : 819 Kbps
Width : 720 pixels
Height : 354 pixels
Display aspect ratio : 2.40:1
Original display aspect ratio : 2.40:1
Frame rate mode : Variable
Frame rate : 23.976 fps
Minimum frame rate : 19.969 fps
Maximum frame rate : 29.970 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.134
Stream size : 1.03 GiB (83%)
Writing library : x264 core 130 r2273 b3065e6
Encoding settings : cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=2 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=6 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=1 / keyint=240 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=10 / rc=crf / mbtree=1 / crf=20.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=20000 / vbv_bufsize=25000 / crf_max=0.0 / nal_hrd=none / ip_ratio=1.40 / aq=1:1.00
Encoded date : UTC 2014-01-02 07:42:11
Tagged date : UTC 2014-01-02 08:05:49
Color primaries : BT.601 NTSC
Transfer characteristics : BT.709
Matrix coefficients : BT.601
Avoid variable frame rate video if you want to fast forward on your samsung....