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View Full Version : Anyone care to take a shot at why this video won't play....




shorn
Jan 14, 2011, 11:09 AM
Hi all,

I've converted (using MKVTools) alot of MKV's successfully. However I hit some that wont play on the appletv (gen2).

Heres the log of the file that wont play...

General / Container Stream #1
Total Video Streams for this File.................1
Total Audio Streams for this File.................1
Video Codecs Used.................................AVC
Audio Codecs Used.................................AAC LC
File Format.......................................MPEG-4
Play Time.........................................51mn 52s
Total File Size...................................677 MiB
Total Stream BitRate..............................1 825 Kbps
Title (Tag).......................................A New Germany (1933 - 1939)
Encoded with......................................iFlicks
Video Stream #1
Codec (Human Name)................................AVC
Codec (FourCC)....................................avc1
Codec Profile.....................................High@L3.1
Frame Width.......................................720 pixels
Frame Height......................................572 pixels
Frame Rate........................................25.000 fps
Total Frames......................................77808
Display Aspect Ratio..............................1.373
Scan Type.........................................Progressive
Color Space.......................................YUV
Codec Settings (Summary)..........................CABAC / 16 Ref Frames
QF (like Gordian Knot)............................0.161
Codec Settings (CABAC)............................Yes
Codec Settings (Reference Frames).................16
Video Stream Length...............................51mn 52s 320ms
Video Stream BitRate..............................1 659 Kbps
Video Stream BitRate Mode.........................VBR
Bit Depth.........................................8 bits
Video Stream Size.................................615 MiB (91%)
Video Stream Title................................/Volumes/BACK UP/The World At War/Season 01/The.World.At.War.s01.e01.A New Germany - 1933-1939.mkv.temp.v1.h264 - Imported with GPAC 0.4.6-DEV (internal rev. 6)
Video Encoder.....................................x264 - core 68 r1195M 5d75a9b
Video Encoder (Settings)..........................cabac=1 / ref=16 / deblock=1:-3:-2 / analyse=0x3:0x133 / me=umh / subme=10 / psy_rd=1.9:0.2 / mixed_ref=1 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / chroma_qp_offset=-3 / threads=3 / nr=0 / decimate=1 / mbaff=0 / bframes=8 / b_pyramid=0 / b_adapt=2 / b_bias=0 / direct=3 / wpredb=1 / keyint=250 / keyint_min=25 / scenecut=40 / lookahead=100 / rc=2pass / mbtree=1 / bitrate=1659 / ratetol=1.0 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:0.85
Date of Original Encoding.........................UTC 2011-01-13 07:04:51
Audio Stream #1
Codec.............................................AAC
Codec (FourCC)....................................40
Audio Stream Length...............................51mn 52s 128ms
Audio Stream BitRate..............................157 Kbps
Audio Stream BitRate Mode.........................VBR
Number of Audio Channels..........................2
Audio Channel's Positions.........................Front: L R
Sampling Rate.....................................48.0 KHz
Audio Stream Size.................................58.4 MiB (9%)
Audio Stream Title................................/Volumes/BACK UP/The World At War/Season 01/The.World.At.War.s01.e01.A New Germany - 1933-1939.mkv.temp.Audio.t0.aac:lang=English - Imported with GPAC 0.4.6-DEV (internal rev. 6)
Audio Stream Language.............................English
Date of Original Encoding.........................UTC 2011-01-13 07:05:16


and heres one that plays fine...

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 / AAC LC
File Format.......................................MPEG-4
Play Time.........................................22mn 59s
Total File Size...................................971 MiB
Total Stream BitRate..............................5 905 Kbps
Title (Tag).......................................Pilot
Encoded with......................................iFlicks
Video Stream #1
Codec (Human Name)................................AVC
Codec (FourCC)....................................avc1
Codec Profile.....................................High@L3.1
Frame Width.......................................1 280 pixels
Frame Height......................................720 pixels
Frame Rate........................................23.976 fps
Total Frames......................................33073
Display Aspect Ratio..............................16:9
Scan Type.........................................Progressive
Color Space.......................................YUV
Codec Settings (Summary)..........................CABAC / 5 Ref Frames
QF (like Gordian Knot)............................0.239
Codec Settings (CABAC)............................Yes
Codec Settings (Reference Frames).................5
Video Stream Length...............................22mn 59s 421ms
Video Stream BitRate..............................5 285 Kbps
Video Stream BitRate Mode.........................VBR
Bit Depth.........................................8 bits
Video Stream Size.................................870 MiB (90%)
Video Stream Title................................/Volumes/BACK UP/Modern Family/Season 01/Modern.Family.S01E01.720p.BluRay.X264-REWARD.mkv.temp.v1.h264 - Imported with GPAC 0.4.6-DEV (internal rev. 6)
Video Encoder.....................................x264 - core 104 r1713 c276662
Video Encoder (Settings)..........................cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-2 / threads=12 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=240 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=5285 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00
Date of Original Encoding.........................UTC 2011-01-12 22:58:44
Audio Stream #1
Codec.............................................AC-3
Codec (FourCC)....................................ac-3
Audio Stream Length...............................22mn 59s 424ms
Audio Stream BitRate..............................448 Kbps
Audio Stream BitRate Mode.........................CBR
Number of Audio Channels..........................6
Audio Channel's Positions.........................Front: L C R, Side: L R, LFE
Sampling Rate.....................................48.0 KHz
Bit Depth.........................................16 bits
Audio Stream Size.................................73.7 MiB (8%)
Audio Stream Title................................/Volumes/BACK UP/Modern Family/Season 01/Modern.Family.S01E01.720p.BluRay.X264-REWARD.mkv.temp.Audio.t0.ac3:lang=English - Imported with GPAC 0.4.6-DEV (internal rev. 6)
Audio Stream Language.............................English
Date of Original Encoding.........................UTC 2011-01-12 22:59:21
Audio Stream #2
Codec.............................................AAC
Codec (FourCC)....................................40
Audio Stream Length...............................22mn 59s 349ms
Audio Stream BitRate..............................157 Kbps
Audio Stream BitRate Mode.........................VBR
Number of Audio Channels..........................2
Audio Channel's Positions.........................Front: L R
Sampling Rate.....................................48.0 KHz
Audio Stream Size.................................25.9 MiB (3%)
Audio Stream Title................................/Volumes/BACK UP/Modern Family/Season 01/Modern.Family.S01E01.720p.BluRay.X264-REWARD.mkv.temp.Audio.t0.added.aac:lang=English - Imported with GPAC 0.4.6-DEV (internal rev. 6)
Audio Stream Language.............................English
Date of Original Encoding.........................UTC 2011-01-12 22:59:28


Theres not much difference between them so i cannot understand what the problem is.



roidy
Jan 14, 2011, 11:16 AM
At a guess I'd say it's because it's been encoded with 16 reference frames:eek: Thats gonna make any device struggle.

shorn
Jan 14, 2011, 11:52 AM
That was the only thing that i noticed was different. What do the reference frames mean then? This is untouched video, so I'm guessing it'll need encoding? I was hoping avoid that, especially as it was h264 originally. Its a pain, cos it plays flawlessly in iTunes, but i guess ATV is another beast!

roidy
Jan 14, 2011, 12:31 PM
Reference Frames (http://en.wikipedia.org/wiki/Reference_frame_(video))

To put it into perspective Blu-ray's usually have between 2 and 5 reference frames, 16 is just plain stupid but alas you find this in a lot of torrented material. The people who encode them think there getting better quality by using insainly high ref frame numbers when infact there just making the file harder to play.

BlackMangoTree
Jan 14, 2011, 03:11 PM
As other have said 16 reference frames is the issue. Why do people encode in stupid ways.