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Buffering with streaming over wifi  XML
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bugoy8



Joined: 08/25/2009 22:36:38
Messages: 9
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Hi, great app first and foremost!

Just had a question on buffering when streaming remotely over wifi. Playback buffers every few seconds. Is this due to connection or due to the spec of the host PC (ie. which is a P4 3ghz machine).

Setup:
- Port fwd setup in router
- Connect manually to server / host - IP:port

Appreciate your feedback.
Admin



Joined: 08/23/2009 08:49:34
Messages: 8705
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Hi,

what's your (home) internet connection upload speed and the remote WiFi download speed? If playback buffers every few seconds it means the bandwidth is not enough. If you are using live conversion you can try reducing the resolution or decreasing the quality.
Anonymous



Thanks for the quick reply.

Upload is around 700kbs. DL bandwidth from wifi is around 1.5 to 2mbs.

I've decreased the quality, same result.

Thing is I get a msg on the app saying the computer might not be fast enough to transcode? But files which are not transcoded suffer the same faith (ie. it stops every 5 seconds.
bugoy8



Joined: 08/25/2009 22:36:38
Messages: 9
Offline

Oppss, my post above. Forgot to login.
Admin



Joined: 08/23/2009 08:49:34
Messages: 8705
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What is your computer CPU? Do you have the warning also when using live conversion over local network? Files that are already converted have probably bigger bitrate than your bandwidth is.
bugoy8



Joined: 08/25/2009 22:36:38
Messages: 9
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PC spec:
- P4 2.8ghz
- 2gbs RAM

Yeah I do get the warning over the local network. Actual message states "Warning. Your computer seems to be too slow to be able to convert this video live. Do you want to continue anyway?""

And it still buffers over the local network. Am I safe to assume that this is a PC speed issue? Under processes (task manager), the ffmpeg.exe is on 98% utlization.



Admin



Joined: 08/23/2009 08:49:34
Messages: 8705
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You computer is too slow for smooth live conversion. Video transcoding is a very demanding task. Core Duo processor or faster is recommended.
bugoy8



Joined: 08/25/2009 22:36:38
Messages: 9
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Okay thanks. I can try it on a C2D.

Files that are already converted have probably bigger bitrate than your bandwidth is.


Based on what you mentioned above, it is better to convert / transcode the files, thus making it best suited for the iphone?

Ie. if both Play and Play live conversion options are available, is it better to choose the latter as the former may have bigger bitrates, etc.

Again appreciate your responses.
Admin



Joined: 08/23/2009 08:49:34
Messages: 8705
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bugoy8 wrote:Okay thanks. I can try it on a C2D.

Files that are already converted have probably bigger bitrate than your bandwidth is.


Based on what you mentioned above, it is better to convert / transcode the files, thus making it best suited for the iphone?

Ie. if both Play and Play live conversion options are available, is it better to choose the latter as the former may have bigger bitrates, etc.

Again appreciate your responses.


When I was writing the above I didn't realize that you're trying it on and older single core CPU. The main problem with your buffering is you computer. Bandwidth comes second. On WiFi it's probably best to have the files converted upfront (so that they don't need to be converted while watching) but that means additional time spent converting the videos. Live conversion solves this problem by converting the file as you're watching it. Live Conversion is also better suited for streaming over 3g / outside your local network because you can easily change video quality without having to recode entire file.
bugoy8



Joined: 08/25/2009 22:36:38
Messages: 9
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Hi,

Installed this on a quicker C2D e7200 machine. Whilst it's improved the playback with live conversion, its still buffers quite often (not as bad as the p4 machine).

I've lowered the quality and res, which improves connection. However still get the buffer issue.

Tried to on the following:
- playing mkv from local drive (host local drive)
- playing avi from network drive

Guess we can attribute this to bandwidth then?

Really want this to work as I've a great solution. Will save me from converting all my videos to m4v format.

Admin



Joined: 08/23/2009 08:49:34
Messages: 8705
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Hi,

do you get the buffering while playing over local network or over internet? Can you try playing a file using live conversion and after some playback time copy the live conversion log (depending on whether you use beta server version it will be either in conversion tab or in the logs tab) and paste it here? Thanks.
bugoy8



Joined: 08/25/2009 22:36:38
Messages: 9
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- Buffering over the internet, both wifi and 3G
- Using beta server

Here's the log. Thanks for your help

Admin



Joined: 08/23/2009 08:49:34
Messages: 8705
Offline

Okay, from the log I can tell the following. Your computer is fast enough to do live transcoding. In your first log you seem to have high quality set which results in video bitrate of roughly 1000kbit/s. That can be bit too big for 3G.

In second you decreased the quality so the resulting bitrate is around 550kbit/s. That should be small enough for smooth playback over 3G. If you keep getting buffering it means that either your internet connection upload speed is too slow (might happen with asymmetric connections such as ADSL where upload speed is significantly slower than download) or that there are local 3G problems with your provider. In some locations 3G doesn't run on full speed.
bugoy8



Joined: 08/25/2009 22:36:38
Messages: 9
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Just did a speedtest. Upload speedtest from my home connection is .77mbs. That should be sufficient right?



The DL speed via wifi, which I use whilst outside (ie. from work), is around 1.5mbs. Will post a speedtest later today.
Admin



Joined: 08/23/2009 08:49:34
Messages: 8705
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The upload bandwidth should be enough for medium quality of most movies (movies with lot of action and quick scenes might need lower quality/resolution or bigger bandwidth).
The problem here might be 3G download speed. In my experience it's rather variable. Depending on location and signal coverage it can get as slow as 100kbps. Also strong signal doesn't necessarily mean that the 3G is going to be fast.
 
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