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download-buffer speed

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John OCallaghan

download-buffer speed

Hi All

Am wondering if someone out there can help me to construct a pipe to process video frames faster than 1x speed?

I am creating a GST pipeline with the following elements and caps:

uridecodebin (download=TRUE) -> queue -> appsink (drop=FALSE, buffers=1).

I then have a test framework that uses this pipe and runs in a tight loop calling gst_app_sink_pull_sample().

With the above I have measured that the downloadbuffer constructed in uridecodebin appears to be downloading content at 1x speed.

I think this is the case because if I wait for 10 seconds and then pull 10 seconds of frames then I can see my test pull all the frames in 1sec.

But if I wait less than 10seconds and try the same then I can see it delay (waiting for frames to download).

Basically what I am seeing is that for however many seconds of frames I want to pull I need to wait that corresponding amount of time or I will see a delay on the pipe.

Is there someway to tell the downloadbuffer to pull data quicker than 1x?

Apologies in advance if I haven’t explained myself very well!

Many thanks

John

Accenture Global Solutions Limited, 3 Grand Canal Plaza, Grand Canal Street Upper, Dublin 4

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Tim Müller

Re: download-buffer speed

On Mon, 2017-01-16 at 16:31 +0000, [hidden email] wrote:

Hi John,

Am wondering if someone out there can help me to construct a pipe to process video frames faster than 1x speed?

I am creating a GST pipeline with the following elements and caps:

uridecodebin (download=TRUE) -> queue -> appsink (drop=FALSE, buffers=1).

I then have a test framework that uses this pipe and runs in a tight loop calling gst_app_sink_pull_sample().

With the above I have measured that the downloadbuffer constructed in uridecodebin appears to be downloading content at 1x speed.

I think this is the case because if I wait for 10 seconds and then pull 10 seconds of frames then I can see my test pull all the frames in 1sec.

But if I wait less than 10seconds and try the same then I can see it delay (waiting for frames to download).

Basically what I am seeing is that for however many seconds of frames I want to pull I need to wait that corresponding amount of time or I will see a delay on the pipe.

Is there someway to tell the downloadbuffer to pull data quicker than 1x?

What kind of URI is it? In other words - where does the data come from?

Cheers

-Tim

--

Tim Müller, Centricular Ltd - http://www.centricular.com

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gstreamer-devel mailing list
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John OCallaghan

Re: download-buffer speed

I have tried from a few different types of URI:

For example:

file:///my/local/file.webm

https://download.blender.org/durian/trailer/sintel_trailer-720p.mp4

With both variants I am seeing similar behavior.

Thanks

John

Accenture Global Solutions Limited, 3 Grand Canal Plaza, Grand Canal Street Upper, Dublin 4

From: gstreamer-devel <[hidden email]> on behalf of Tim Müller <[hidden email]>
Organization: Centricular Ltd
Reply-To: Discussion of the development of and with GStreamer <[hidden email]>
Date: Monday 16 January 2017 at 17:24
To: Discussion of the development of and with GStreamer <[hidden email]>
Subject: Re: download-buffer speed

On Mon, 2017-01-16 at 16:31 +0000, [hidden email] wrote:

Hi John,

Am wondering if someone out there can help me to construct a pipe to process video frames faster than 1x speed?

I am creating a GST pipeline with the following elements and caps:

uridecodebin (download=TRUE) -> queue -> appsink (drop=FALSE, buffers=1).

I then have a test framework that uses this pipe and runs in a tight loop calling gst_app_sink_pull_sample().

With the above I have measured that the downloadbuffer constructed in uridecodebin appears to be downloading content at 1x speed.

I think this is the case because if I wait for 10 seconds and then pull 10 seconds of frames then I can see my test pull all the frames in 1sec.

But if I wait less than 10seconds and try the same then I can see it delay (waiting for frames to download).

Basically what I am seeing is that for however many seconds of frames I want to pull I need to wait that corresponding amount of time or I will see a delay on the pipe.

Is there someway to tell the downloadbuffer to pull data quicker than 1x?

What kind of URI is it? In other words - where does the data come from?

Cheers

-Tim

--

Tim Müller, Centricular Ltd - http://www.centricular.com

John OCallaghan

Re: download-buffer speed

Ah!

I think I may have found something.

If I call gst_event_new_seek() with a rate of 32 (off the top of my head) I am now seeing much faster downloadbuffer speeds against a local file.

I will need to do more investigating into how this is happening but for the first time today I am seeing a chink of light!

Will let ye know how I get in.

Thanks

John

Accenture Global Solutions Limited, 3 Grand Canal Plaza, Grand Canal Street Upper, Dublin 4

From: "O'Callaghan, John" <[hidden email]>
Date: Monday 16 January 2017 at 17:28
To: Discussion of the development of and with GStreamer <[hidden email]>
Subject: Re: download-buffer speed

I have tried from a few different types of URI:

For example:

file:///my/local/file.webm

https://download.blender.org/durian/trailer/sintel_trailer-720p.mp4

With both variants I am seeing similar behavior.

Thanks

John

Accenture Global Solutions Limited, 3 Grand Canal Plaza, Grand Canal Street Upper, Dublin 4

On Mon, 2017-01-16 at 16:31 +0000, [hidden email] wrote:

Hi John,

Am wondering if someone out there can help me to construct a pipe to process video frames faster than 1x speed?

I am creating a GST pipeline with the following elements and caps:

uridecodebin (download=TRUE) -> queue -> appsink (drop=FALSE, buffers=1).

I then have a test framework that uses this pipe and runs in a tight loop calling gst_app_sink_pull_sample().

With the above I have measured that the downloadbuffer constructed in uridecodebin appears to be downloading content at 1x speed.

I think this is the case because if I wait for 10 seconds and then pull 10 seconds of frames then I can see my test pull all the frames in 1sec.

But if I wait less than 10seconds and try the same then I can see it delay (waiting for frames to download).

Basically what I am seeing is that for however many seconds of frames I want to pull I need to wait that corresponding amount of time or I will see a delay on the pipe.

Is there someway to tell the downloadbuffer to pull data quicker than 1x?

What kind of URI is it? In other words - where does the data come from?

Cheers

-Tim

--

Tim Müller, Centricular Ltd - http://www.centricular.com