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johnywhy

Bug? Player is late.

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is this a bug?

 

during playback of video in storyboard, if i click pause, the video does NOT pause on the frame currently in the preview pane.

 

instead, it jumps ahead many seconds, and pauses at a different point in the video.

 

i also notice that the video in the preview pane is several seconds behind the timeline position.

 

using a netbook with 1 Gig ram.

 

(VideoPad is the only free video editor i've found yet, which gives me real-time playback on a machine with limited memory, so i hope this can be fixed.)

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is this a bug?

 

during playback of video in storyboard, if i click pause, the video does NOT pause on the frame currently in the preview pane.

 

instead, it jumps ahead many seconds, and pauses at a different point in the video.

 

i also notice that the video in the preview pane is several seconds behind the timeline position.

 

using a netbook with 1 Gig ram.

 

(VideoPad is the only free video editor i've found yet, which gives me real-time playback on a machine with limited memory, so i hope this can be fixed.)

 

This is a performance issue.

Please give us some details about your system and video file you try to edit in Videopad:

- CPU (Processor) frequency and model;

- Resolution of your video file (use MediaInfo tool if required);

 

Also make sure you always connect your netbook to a power source when using Videopad.

Netbook often decreases CPU performance when running on battery.

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This is a performance issue.

Please give us some details about your system and video file you try to edit in Videopad:

- CPU (Processor) frequency and model;

- Resolution of your video file (use MediaInfo tool if required);

 

Also make sure you always connect your netbook to a power source when using Videopad.

Netbook often decreases CPU performance when running on battery.

 

Hi,

 

I'm experiencing a similar / identical problem. The preview pane video is slow and falls behind the audio track. If I pause and resume the playback, the video jumps to the right frame and is in sync with the audio track, but starts to fall behind right away after resuming.

 

The media file I'm editing / previewing is a 720p H.264 that I've converted to .avi using Matrox MPEG-2 I-frame HD codec, data rate 150Mb/s. Further details by your suggested MediaInfo further down *).

 

I'm also using a laptop, but it's a Lenovo X301 with Intel dual-core U9400, 3GB of RAM, and an SSD hard drive, so quite a powerhouse for a laptop. It is a little low on SSD space - just 7GB free - so it's possible that things are getting tight there. Any recommendations? I've already cleaned the cache with Videopad. Any other places I should look into?

 

I consider myself relatively experienced with PCs, so all tips, even detailed to the bone, are welcome. I try to avoid touching registers, though :)

 

Thanks,

JSK

 

*)

 

General

Format : AVI

Format/Info : Audio Video Interleave

Format profile : OpenDML

File size : 5.90 GiB

Duration : 7mn 27s

Overall bit rate : 113 Mbps

 

Video

ID : 0

Format : M701

Codec ID : M701

Duration : 7mn 27s

Bit rate : 112 Mbps

Width : 1 280 pixels

Height : 720 pixels

Display aspect ratio : 16:9

Frame rate : 29.970 fps

Bits/(Pixel*Frame) : 4.045

Stream size : 5.82 GiB (99%)

 

Audio

ID : 1

Format : PCM

Format settings, Endianness : Little

Format settings, Sign : Signed

Codec ID : 1

Codec ID/Hint : Microsoft

Duration : 7mn 27s

Bit rate mode : Constant

Bit rate : 1 536 Kbps

Channel(s) : 2 channels

Sampling rate : 48.0 KHz

Bit depth : 16 bits

Stream size : 82.0 MiB (1%)

Interleave, duration : 166 ms (4.98 video frames)

Interleave, preload duration : 469 ms

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Hi Nat,

 

quite some logic there in your post - I'm not gonna go into all details of it in my response. However, I'd like to emphasize that "big file size" does not necessarily mean "lots to do for the computer"; in fact, it can be the opposite, because the pre-converted MPEG-2 (your large .avi) means that the editor does not have to convert / process the file on-the-fly while editing as it has to do with highly compressed formats (that your MP4 likely is; this is more about the contents / codecs, not the container).

 

I'm a video edit newbie myself, but quite sure of that above. See more @ http://buildyourown.wordpress.com/2010/08/08/how-to-transcode-mov-files-using-matrox-codecs.

 

> I have repeated this with MPEG2 clips and there is no

> delay at all so it seems to be linked to using MPG4 video.

 

I strongly encourage you to go for a setup that works. I wouldn't try editing my .MOV (H.264 + AAC audio) without converting it first into something less compressed.

 

JSK

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