Quality Issue AVCHD

[R.A.J.]

After many years happy with SD quality I have just bought a Sony HDR XR520 Handycam. I have used a Sony VGNAR71M laptop with the bundled Premiere elements 4 for editing. The process works fine once I got used to the idea of proxy files.

I have burnt the resulting files onto a DVD
However, occaisionally the resulting output suffers from horizontal lines. It appears that the image from one frame to the next is displaced. There are no blank lines, black, white or discolored sections or pixilation.

Bundled with the camera is Sony PMB (Picture motion browser). Although this is merely a downloading tool & not an editing suite it does present as near opportunity to use Sony's processing. Playing the downloaded files before editing I now realise also produces this symptom. However, advancing frame by frame, using PMB, there are no frames showing any interference!

Playing the video straight from the camera via a HDMI cable to a Panasonic TX-P46G10B TV does not show the symptoms, but although the content was recoded at 1920 * 1080 @ Highest quality the TV isists on playng at 720p definition.

Can anyone please advise how to produce DVD's of HD quality without this irritation?
Many thanks.

[filmboss80]

DVD is standard definition. The best it will give you is 720 x 576 pixels. Although AVCHD video files can be stored on DVD disc, it won't play back on a standard DVD player. If you want HD, you will have to upgrade to Blu-ray.

[R.A.J.]

Thanks but I think you misunderstand me .
The DVD is just a convenient medium for the m2t files.

The symptoms appear even when AVCHD is played from the HDD

As yet Blu ray is expensive, but then DVD's were once.

[poisondeathray]

AVCHD is usually interlaced TFF , did you author the dvd with the same settings?

When the native AVCHD is played from the HDD, do you see something like this:
www.100fps.com

[filmboss80]

I got it. You're basically doing something like what was discussed in this thread: https://forum.videohelp.com/topic350515.html

Yeah, it's probably an interlacing or field mismatch issue.

[aedipuss]

could you post a screenshot of the problem.

[R.A.J.]

Thanks guys.

The interlace situation happens all the time, every frame?. This is only occaisionally.

Also the sympton appears in unedited video?
There can be say 15 seconds clear result in a 20 second clip, then a ripple may be seen!

If I sent a snapshot of a frame you'd see no problems.

It seems to be associated with zooming.

Maybe the data rate @ 1080 is too quick for something.

Also why does the direct Camera TV link insist on 720p & is flawless.

[poisondeathray]

If it's not evident on a snapshot, then please post an unedited original clip (.m2ts , .mts) that illustrates the the issue

[R.A.J.]

OK I'll try but is there a limit to the file size allowable?

Thanks in advance

[creamyhorror]

I'm assuming what you're seeing is "combing", i.e. small sections of regularly-spaced lines. My guess is that you're probably not choosing the correct deinterlacing option in Premiere. But to be sure, we'd need to:

1) know your Premiere export settings
2) see a sample output clip


edit: Actually, if the problem is occurring in the source footage, then seeing a copy of that would be more useful (as PDR has indicated)

[poisondeathray]

OK I'll try but is there a limit to the file size allowable?

I think it's 6MB here, but you can use a free hosting site if larger (e.g. mediafire.com , megaupload.com)

You can cut a section with tsmuxer, for example

[R.A.J.]

Ok This is very short because of the file size limit
I'll look into hosting a larger one tomorrow.
Hope you see something

Cheers!

20090628102907(2).m2ts

[poisondeathray]

I think that's the correct link:

https://forum.videohelp.com/images/guides/p2000570/20090628102907(2).m2ts

occaisionally the resulting output suffers from horizontal lines. It appears that the image from one frame to the next is displaced

I'm not seeing any bizzare horizontal lines in that clip, even when separate fields are viewed

How are you viewing this (how do you have it setup)? i.e. what software media player, what video decoder? Are you deinterlacing for playback?

[R.A.J.]

Hi

Here is a longer clip

http://www.mediafire.com/?sharekey=8e20ddcb2cba1ee0a0f2f20c509059d9013bb13348ab0d2c5621d66e282a0ee8

As I see it most is quite good quality but spoilt?

I just use Windows media player. which seems to work Ok for most...

Deinterlacing Decoding Please advise I just use the defalt WMP whatever that is. I'm a bit suspicious of loading too many codecs in case of conflicts.

Cheers.

[R.A.J.]

Well guys I think I found the answer, but it's good to get otherr views & if you couldn't see the errors I could then....

I got to thinking about screen resolutions & that the laptop although has Full HD 1080 on the spec is normally used with a 1400 * 900 resolution , So just about to explore this.

I ran the video with output only to the TV & nothing to laptop screen

So guess what the symptoms dissappeared...

Conflict between rsolutions or just loading.

I'd be interested....

Anyway thanks for those who offered ideas.

Cheers

[creamyhorror]

The clip is just normally interlaced. I think R.A.J. doesn't have deinterlacing enabled in his player.

R.A.J., if you're seeing interlaced lines (combing) in small sections of the DVD, then it sounds like your video editor is messing up somewhere along the way. You may be using incorrect settings in your editor, or it may simply be an inherent weakness in the program. If you can take a snapshot or otherwise tell us what settings you used to export the clip, that would make things easier. (Premiere is known to do poor downscaling and exporting of AVCHD to DVD, so that could be the problem.)

[creamyhorror]

I got to thinking about screen resolutions & that the laptop although has Full HD 1080 on the spec is normally used with a 1400 * 900 resolution , So just about to explore this.

I ran the video with output only to the TV & nothing to laptop screen

Your TV is probably deinterlacing your footage. Your software player wasn't configured to do it.

[creamyhorror]

Here's how it looks while interlaced (when the player doesn't do any deinterlacing):



After deinterlacing:



Deinterlaced clip:
http://www.mediafire.com/file/oqnyhnmqxmh/horsey.mp4

(I think there may be a framerate issue in your original footage, resulting in the incorrect clip length of my output.)

[poisondeathray]

I ran the video with output only to the TV & nothing to laptop screen

So guess what the symptoms dissappeared...

That's great. But you said you the burned DVD has these artifacts? Even when played on the standalone player? Your theory doesn't explain this observation...

If you deinterlaced with Premiere (to make a progressive DVD), this might explain your observation, as what you might be seeing are deinterlacing artifacts... But you shouldn't deinterlace when making your DVD.

As creamyhorror suggested, maybe you can examine your DVD and cut a small piece that replicates this issue (e.g. using DVD shrink, or even mpg2cut2)