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Old 25th January 2013, 23:52   #14021  |  Link
loudmax
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Hi Nev,

thanks for your great work!
Itīs the only freeware that plays broadcast AVC-Intra atm.

There only seems to be a problem with the automatic field order detection. When field order is set to "auto" the motion in the video looks wrong. When I set it to "top field first" the video is fine.
Iīve tested AVC-Intra clips from different sources, like Avid, Omneon, Quantel...all with the same result. MediaInfo reports all of them as top field first.

Iīve uploaded a file for you, where the motion jitter is clearly visible: http://free-vsts.com/files/MXF/AVCI100_1080_sps.mxf

Thanks for your help!
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Old 25th January 2013, 23:54   #14022  |  Link
glorp
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Quote:
Originally Posted by 6233638 View Post
I thought that's what the "Forced Subtitles (Auto)" stream was supposed to be, but I can't think of a single disc where that has ever shown any subtitles. (I have it set to use that track on English discs by default)
That's what I thought too. But the tooltip on the option says it may not work with all discs so I guess now we know which ones are likely candidates for that
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Old 26th January 2013, 01:31   #14023  |  Link
Blight
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nev:
Do you think you can support DVD Fast Forward with audio and pitch correction when decoding the audio?
The "IDVDControl2" interface supports it through the "SetOption" function with the "DVD_AudioDuringFFwdRew" flag.

I apply this flag in Zoom Player when the following setting is enabled:
Adv. Options / Playback / DVD / DVD Values - Maintain audio during fast forward / rewind
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Old 26th January 2013, 07:01   #14024  |  Link
nevcairiel
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I could probably enable audio somehow, but not with pitch correction. Faster audio just sounds funny then.
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Last edited by nevcairiel; 26th January 2013 at 08:43.
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Old 26th January 2013, 07:28   #14025  |  Link
nevcairiel
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Quote:
Originally Posted by loudmax View Post
There only seems to be a problem with the automatic field order detection. When field order is set to "auto" the motion in the video looks wrong. When I set it to "top field first" the video is fine.
Iīve tested AVC-Intra clips from different sources, like Avid, Omneon, Quantel...all with the same result. MediaInfo reports all of them as top field first.
I don't think either MediaInfo or LAV actually detect anything, the difference is the default assumption. If LAV doesn't detect any field order indication, it defaults to BFF, and it seems that MediaInfo defaults to TFF.
I'm not sure what is the better assumption, really.

Not sure how one would figure this out from this stream, i find no indications of field order.
But thats what the option is for, to override it on the occasional file which doesn't tell us this.
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Last edited by nevcairiel; 26th January 2013 at 07:44.
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Old 26th January 2013, 09:01   #14026  |  Link
pankov
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Nev,
if you haven't already done it and you have access to this parameter when select the field order you can use the framerate as a helper.
If I'm not mistaken most PAL (50i) content ... except DV which I'm not sure is that popular nowadays .... is TFF. Most 60i contenet is BFF.
I can't test the file right now to see if follows this rule because I'm on my tablet but I hope post could help.
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Old 26th January 2013, 09:03   #14027  |  Link
nevcairiel
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ffmpeg only has a flag called "top_field_first", which can be 0 or 1, it doesn't exactly tell me if it actually determined the file is BFF, or if thats just the value being unset =p
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Old 26th January 2013, 09:19   #14028  |  Link
wanezhiling
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According to my personal experience, most broken interlaced videos (no field order) are actually TFF.
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Old 26th January 2013, 09:23   #14029  |  Link
Pomegranate
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Is it possible to back up settings? I'll be switching to Win 7 x64 this weekend.
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Old 26th January 2013, 09:40   #14030  |  Link
wanezhiling
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Originally Posted by Pomegranate View Post
Is it possible to back up settings? I'll be switching to Win 7 x64 this weekend.
http://i.imgur.com/ckEyjnJ.png
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Old 26th January 2013, 09:56   #14031  |  Link
Pomegranate
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"A picture is worth a thousand words". Thank you.
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Old 26th January 2013, 10:01   #14032  |  Link
nevcairiel
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Quote:
Originally Posted by wanezhiling View Post
According to my personal experience, most broken interlaced videos (no field order) are actually TFF.
Well, you may think that now, but when you play such a broken file that is BFF, you wouldn't notice that its broken, because it defaults to BFF.
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Old 26th January 2013, 10:36   #14033  |  Link
loudmax
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As far as I know, bff was originated by the NTSC standard. All HD codecs and PAL SD codecs are tff. Exept DV25, DVCPro25 and DVCPro50, which are bff in PAL and NTSC.
So maybe you could let the fieldorder automatic check if the video is not dv, but 25fps or HD and then switch to tff?
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Old 26th January 2013, 10:38   #14034  |  Link
nevcairiel
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Didn't i already mention that it doesn't tell me if it detected a movie to be BFF, or just didn't detect anything at all? There is no distinction there.
Feel free to request this from the ffmpeg developers, i don't have the resources to fix every problem in ffmpeg myself.
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Last edited by nevcairiel; 26th January 2013 at 10:47.
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Old 26th January 2013, 10:51   #14035  |  Link
loudmax
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Okay, thanks!
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Old 26th January 2013, 16:55   #14036  |  Link
iSunrise
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nev, I cannot get Camtasia files to play with the LAV decoder. LAV Splitter seems to be doing everything correctly and detects it, but the LAV decoder doesnīt get invoked. The file has the (new) TechSmith Video Codec 2 (which comes with Camtasia Studio 8, older versions only support TechSmith Video Codec). My source (like the sample at the bottom) is an AVI export from the original .camrec file that Camtasia produces when recording.



Am I doing something wrong here? I have enabled .camtasia in the LAV decoder, still doesnīt work. I even tried to manually build a graph with GraphStudio, but the video output pin just wonīt connect to the LAV decoder input pin. Am I doing something wrong?

If I play the file with the AVI Decompressor (quartz.dll) I get heavy image corruption, thatīs why I thought LAV would work, but strangely, it doesnīt.

You can get a sample here:
https://ffmpeg.org/trac/ffmpeg/ticket/1533

Thanks a lot for looking into it!

Last edited by iSunrise; 26th January 2013 at 17:06.
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Old 26th January 2013, 17:05   #14037  |  Link
nevcairiel
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Whoever said it was supposed to work?
But it will work in the future.
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Old 26th January 2013, 17:11   #14038  |  Link
iSunrise
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Quote:
Originally Posted by nevcairiel View Post
Whoever said it was supposed to work?
But it will work in the future.


So you implemented support for it? Wow, that was fast. Eager to try it out now!
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Old 26th January 2013, 17:18   #14039  |  Link
wanezhiling
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Originally Posted by nevcairiel View Post
But it will work in the future.
MPC-BE supports tscc2, let's expect LAV.
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Old 27th January 2013, 12:22   #14040  |  Link
Rimsky
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Two question:

1. does Lav Video Decoder support HW deinterlace on AMD Radeon in future? Or only NV/cuda/QS?
I interesting only in "copy-back" deinterlace for recoding and SmoothVideo Project

2. YADIF seem to be worst than linear blending. What can I do fo better deinterlace quality with LAV Video?
Or may be LAV Video can make software linear deinterlace in newer version? yeah, it is not perfect, but better than nothing and chip for CPU.

LAV + YADIF


FFDSHOW + Linear blending

Last edited by Rimsky; 27th January 2013 at 12:27.
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