Is there bit rate limitation for H264 video on the PCH A200?

[jutoto]

Hi

I have some problems with video files from my Smartphone.
it's seams to be the bit rate that is too hight??
the original Bit rate is 17 Mbps
the movie freeze some times, to have a good view I need to decrease the bite rate lower than 15Mbps.

My movies are h264 encoded in 1080p.
Is there a limitation with the A200 hardware and what is this limit???
Do you think that the A300 hardware is more and enought powerfull to read this kind of file???

Media info :

Général
Nom complet : D:\moto2012\8.04.12\20120408_111342.mp4
Format : MPEG-4
Profil du format : 3GPP Media Release 4
Identifiant du codec : 3gp4
Taille du fichier : 75,5 Mio
Durée : 37s 38ms
Type de débit global : Variable
Débit global moyen : 17,1 Mb/s

Vidéo
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Profil du format : High@L4.0
Paramètres du format, CABAC : Oui
Paramètres du format, RefFrames : 1 image
Paramètres du format, GOP : M=1, N=30
Type de muxing : Container profile=Unknown@22.4
Identifiant du codec : avc1
Identifiant du codec/Info : Advanced Video Coding
Durée : 37s 38ms
Durée de la source duration : 37s 71ms
Type de débit : Variable
Débit : 17,0 Mb/s
Largeur : 1 920 pixels
Hauteur : 1 080 pixels
Format à l'écran : 16/9
Type d'images/s : Variable
Images par seconde : 30,050 Im/s
Images/s mini : 25,641 Im/s
Images/s maxi : 37,037 Im/s
Espace de couleurs : YUV
Sous-échantillonnage de la chrominance : 4:2:0
Profondeur des couleurs : 8 bits
Type d'image : Progressif
Bits/(Pixel*Image) : 0.273
Taille du flux : 75,1 Mio (100%)
Taille du flux source : 75,2 Mio
Langue : Anglais

Audio
ID : 1
Format : AAC
Format/Info : Advanced Audio Codec
Profil du format : LC
Identifiant du codec : 40
Durée : 37s 36ms
Durée de la source duration : 37s 48ms
Type de débit : Variable
Débit : 61,3 Kbps
Débit maximum : 71,3 Kbps
Canaux : 1 canal
Position des cannaux : Front: C
Echantillonnage : 44,1 KHz
Mode de compression : Avec perte
Taille du flux : 277 Kio (0%)
Taille du flux source : 277 Kio
Langue : Anglais

Thank you

[halfelite]

that isnt even close to the limit. to give an idea avatar movie is 45Mb/s it should play that no problem. but being from a phone and inside mp4 could be your problem. see what happens if you remux the file to mkv without changing bitrate

[Nebraskaguy]

As i know, the bit rate of H.264 video on PCH A200 should be at least 40Mbps ...

[accident]

people play test videos well over 100mbps no problem.

[jutoto]

Ok.

I made some test this week.
My files was on a network media server and it seams that for video with high bit-rate (>20mbs)the problem is the network transfer speed. because when the same files is on the local hard drive of the popcorn it work fine.

I made other test with the same film encoded with different setting of the H264, and it seams that the problem is not really the output bit-rate, but mostly the choice of the algorithm complexity.
The codec level and the image key setting.

I notice that if I reduce the images number between 2 images key so we have more images key => THE VIDEO IS MORE FLUID
may be because the popcorn have less job to calculate and rebuild images???

[halfelite]

You just give your answer. Your network is not fast enough to stream the video for some reason. I have level 5.1 with 18 refrrames that i stream just fine to my pch.

[tman12]

Not sure if this will help in your situation or not but I posted this thread http://www.networkedmediatank.com/showth...?tid=49277 a while ago that fixed the issue I was having with high bitrate files. After changing the receive window I haven't had a single problem with even the highest bit rate files I throw at it. Maybe it will work for you too, good luck.

[jutoto]

Thank you I will try, but where can I set the receive window???
Is it a pch param?

---

@halfelite
I export ma video from adobe premiere with the adobe media encoder (no other choices) that it work with the mainconcept h264 encoder.
what ever I set into the "distance between keyframes" param I always have an output file with refFrame = 3 images?

What the refFrames is about?

How can I set it?

[jutoto]

@tman12, thank you
setting the network speed to auto solve 80% of my problems.
Now videos with bit rate > 20 mbs are readable from the network.
I have only video slowdown as the bit rate increases rapidly.

I have found where to set the receive window (it appears when I change to auto) so I will test your value and may be others...