SMB - limited bandwidth

Hello,

playing the same file from an SMB server via wifi is fine with VLC 2.2.2, but VLC 3.0.1 is constantly buffering.

When monitoring the network traffic, it can go over 3Mio/s with VLC 2, but seems to be limited to ~ 2Mio/s with VLC 3. The wifi connexion speed is ~ 100 Mbit/s.

I have tested with default settings on two distributions (Kubuntu, KDE Neon), the results are the same.

Missing logs.

assigned to @Courmisch

added Component::Input: network streams label

VLC 3.0.1 log

Added attachment:

• vlc-3-log.txt

The video is this trailer: http://www.demo-world.eu/download-movie-trailers-hd/?file=mad_max_fury_road_2015_tlr1-DWEU.mkv&pic=mad_max_fury_road_2015.jpg

But it can be reproduced with any high bitrate videos.

I have also compiled VLC 4.0.0git and have the same results.

Is it with the same SMB module?

On Kubuntu 18.04, the SMB plugin is 3.0.1

On Kde Neon, which is based on Ubuntu 16.04, the SMB plugin is 2.2.2. But I am using the snap version of VLC 3.0.1

I hope this answers your question, I don't know how to check the version of a module from within VLC.

No, I mean: both are using smbclient, not dsm plugin (you can see that in the logs)

vlc 2.2.2 log

Added attachment:

• vlc-2-log.txt

Sorry, I am still a bit confused.

I have attached the log from vlc 2.2.2. I hope it is helpful.

Try to increase the prefetch-read-size value and see if it helps?

Feels similar to #19806 (closed)

changed milestone to %3.0.x maintenance

I don't think it's a clearly SMB-specific issue.

From https://trac.videolan.org/vlc/ticket/19806#comment:1

Streaming FLAC and MP3 has the buffer issue, but streaming an m4a file from the same network share doesn't.

Original author: László Károlyi

It's a combinaison.

Replying to [comment:7 Rémi Denis-Courmont]:

Try to increase the prefetch-read-size value and see if it helps?

Yes, it helps a lot. Thanks.

The higher I increase the value, the higher the bandwidth's limitation goes. The graph of my network activity is now very similar to what I got with VLC 2.2.2.

What is an acceptable value?

The higher I increase the value, the higher the bandwidth's limitation goes. The graph of my network activity is now very similar to what I got with VLC 2.2.2.

I have 20s of buffer set, and it doesn't help. The data seems to be coming slower than it's played. See #19806 (closed).

Original author: László Károlyi

Replying to [comment:13 Jean-Baptiste Kempf]:

What is an acceptable value? It seems that the higher is the better.

Here are some quick measurements with my particular connection (reported as ~104MBit/s) and with the previous sample:

prefetch-read-size -> maximum peak

default 16k -> 1.9Mio/s\ 32k -> 2.6 Mio/s\ 64k -> 3.0 Mio/s\ 128k -> 3.4 Mio/s\ 256k -> 3.6 Mio/s\ 512k -> 3.7 Mio/s\ 1024k -> 4 Mio/s\ 2048k -> 4.2 Mio/s\ 4096k -> 4.2 Mio/s

2048k seems to be the sweet spot for my particular case. I have almost no buffering issue with my high bitrate samples (the trailer of Mad Max Fury Road, and the trailer of Mission Impossible Rogue Nation from the same website).

Replying to [comment:14 László Károlyi]:

The higher I increase the value, the higher the bandwidth's limitation goes. The graph of my network activity is now very similar to what I got with VLC 2.2.2.

I have 20s of buffer set, and it doesn't help. The data seems to be coming slower than it's played. See #19806 (closed). The value I have changed is in input/codecs -> stream filters -> prefetch -> read size