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MKV (h.264 1080p) playback is jerky
Posted: 25 Sep 2011 19:37
by plotzzz
A terrible truth: HD MKVs (I only have h.264 1080p files) play jerky (saccadé) with VLC but play fine with a basic Windows Media Player 9!
I tried to play with some video output options (overlay, predefined/DirectX) it won't do.
Anybody aware of that ? Any fix ? thanks
PS: I always mux with the latest MKVToolnix/Merge available
Re: MKV (h.264 1080p) playback is jerky
Posted: 25 Sep 2011 22:07
by Jean-Baptiste Kempf
OS?
Re: MKV (h.264 1080p) playback is jerky
Posted: 26 Sep 2011 11:41
by plotzzz
WinXP 32bits (same behaviour on Win7 64bits)
CPU load about 55%
Code: Select all
Général
Identifiant unique : 182881319635063085480521687890419633601 (0x8995A935AF6D87DABF7F0B29EDB5CDC1)
Nom complet : G:\Films\HP.mkv
Format : Matroska
Version du format : Version 2
Taille du fichier : 5,99 Gio
Durée : 2h 15mn
Débit global moyen : 6 317 Kbps
Date d'encodage : UTC 2011-09-24 21:07:46
Application utilisée : mkvmerge v4.9.1 ('Ich will') built on Jul 11 2011 23:53:15
Bibliothèque utilisée : libebml v1.2.1 + libmatroska v1.1.1
Vidéo
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Profil du format : High@L4.0
Paramètres du format, CABAC : Oui
Paramètres du format, RefFrames : 4 images
Paramètres du format, GOP : M=8, N=32
Type de muxing : Header stripping
Identifiant du codec : V_MPEG4/ISO/AVC
Durée : 2h 15mn
Débit : 5 808 Kbps
Largeur : 1 920 pixels
Hauteur : 1 088 pixels
Largeur originale : 1 080 pixels
Format à l'écran : 16/9
Format à l'écran d'origine : 16/9
Images par seconde : 50,000 Im/s
Images/s d'origine : 25,000 Im/s
Espace de couleurs : YUV
Sous-échantillonnage de la chrom : 4:2:0
Profondeur des couleurs : 8 bits
Type d'image : MBAFF
Bits/(Pixel*Image) : 0.056
Taille du flux : 5,51 Gio (92%)
Coordonnées de chromaticité : BT.709-5, BT.1361, IEC 61966-2-4, SMPTE RP177
Caractéristiques du transfert : BT.709-5, BT.1361
Coefficients de la matrice : BT.709-5, BT.1361, IEC 61966-2-4 709, SMPTE RP177
Audio #1
ID : 2
Format : E-AC-3
Format/Info : Audio Coding 3
Type de muxing : Header stripping
Identifiant du codec : A_EAC3
Durée : 2h 15mn
Type de débit : Constant
Débit : 128 Kbps
Canaux : 2 canaux
Position des cannaux : Front: L R
Echantillonnage : 48,0 KHz
Mode de compression : Avec perte
Délai par rapport Vidéo : -340ms
Taille du flux : 124 Mio (2%)
Titre : Stereo
Langue : Anglais
Audio #2
ID : 3
Format : E-AC-3
Format/Info : Audio Coding 3
Type de muxing : Header stripping
Identifiant du codec : A_EAC3
Durée : 2h 15mn
Type de débit : Constant
Débit : 256 Kbps
Canaux : 6 canaux
Position des cannaux : Front: L C R, Side: L R, LFE
Echantillonnage : 48,0 KHz
Mode de compression : Avec perte
Délai par rapport Vidéo : -100ms
Taille du flux : 249 Mio (4%)
Titre : 5.1
Langue : Français
Texte
ID : 4
Format : UTF-8
Identifiant du codec : S_TEXT/UTF8
Identifiant du codec/Info : UTF-8 Plain Text
Langue : Français
Re: MKV (h.264 1080p) playback is jerky
Posted: 26 Sep 2011 15:44
by VLC_help
Re: MKV (h.264 1080p) playback is jerky
Posted: 26 Sep 2011 17:41
by plotzzz
It still won't work.
If it can help an Avidemux developper once told me: "actually vlc is producing them [the jitters] when increasing its PTS delay".
No idea what it means.
PS: happens every time, with mp2 audio as well.
Re: MKV (h.264 1080p) playback is jerky
Posted: 27 Sep 2011 16:12
by VLC_help
Is there some sample file you could share to us?
Re: MKV (h.264 1080p) playback is jerky
Posted: 27 Sep 2011 17:52
by plotzzz
Here is an example generated by Avidemux, but behaviour is the same once remuxed with MKVToolnix. It gives bugs with VLC, but plays fine with WMP9 (ffdshow & Haali media splitter icons showing in the taskbar)
http://dl.free.fr/lZc7Fu5Wb
Re: MKV (h.264 1080p) playback is jerky
Posted: 28 Sep 2011 15:44
by VLC_help
I will check that file during weekend.
Re: MKV (h.264 1080p) playback is jerky
Posted: 02 Oct 2011 16:50
by VLC_help
Thanks. The file must be 1080i since there is MBAFF tag in it. And it is prolly a slow decoding issue related to interlacing since VLC 1.2.0 nightlies play the file much better.
Re: MKV (h.264 1080p) playback is jerky
Posted: 02 Oct 2011 18:16
by plotzzz
Yes, I would say 1080i since Mediainfo or even VLC say 50fps. But again my CPU load doesn't go above 55%. So I guess I just wait for a VLC update ?
Re: MKV (h.264 1080p) playback is jerky
Posted: 03 Oct 2011 15:55
by VLC_help
Current VLC releases can only do single core H.264 decoding. VLC 1.2.0 will support multicore H.264 decoding.
Re: MKV (h.264 1080p) playback is jerky
Posted: 16 Oct 2011 00:15
by plotzzz
I doubt that's the issue because it happens even with 30% CPU load, and disappears if EAC3 is reencoded (which I would like to avoid).
Re: MKV (h.264 1080p) playback is jerky
Posted: 01 Nov 2011 12:16
by plotzzz
Most of all I forgot to mention that before remuxing into MKV, VLC plays the video very well when it's still in the .ts transport stream.