LAV Filters - DirectShow Media Splitter and Decoders

[tuco76]

With madVR, LAV will never perform any dithering. Dithering in LAV is only performed when required, ie. when converting from 10-bit to 8-bit.

Thanks the quick reply nev!

[NikosD]

The file is invalid, seems like it was created before the spec was finalized.

It seems that latest official LAV filters 0.62 decode it fine!

Also, some nightly builds - even the newer ones - decode it fine.

Something from the very latest nightly builds, broke the compatibility.

[nevcairiel]

That doesn't change the reason though. There were a lot of checks added against broken samples that otherwise caused a crash, as a side-effect that can cause invalid samples that worked before (by accident) to stop working, but the sample has always been invalid, so its not a big concern.

[NikosD]

OK

Just to be sure that it's not a bug of the decoder/splitter or FFMpeg.

[jebediah]

Any idea why i don't get the correct sound from this source?
I'm using the latest Lav filter and it works great with ffdshow.

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : V_MPEG4/ISO/AVC
Duration : 1h 51mn
Bit rate : 5 606 Kbps
Width : 1 920 pixels
Height : 802 pixels
Display aspect ratio : 2.40:1
Frame rate mode : Constant
Frame rate : 25.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.146
Stream size : 4.38 GiB (95%)
Writing library : x264 core 130 r2273 b3065e6
Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=240 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=20.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=62500 / vbv_bufsize=78125 / crf_max=0.0 / nal_hrd=none / ip_ratio=1.40 / aq=1:1.00
Default : Yes
Forced : No
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

Audio
ID : 2
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Format settings, Endianness : Big
Codec ID : A_AC3
Duration : 1h 51mn
Bit rate mode : Constant
Bit rate : 192 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Stream size : 154 MiB (3%)
Default : Yes
Forced : No

[filler56789]

Any idea why i don't get the correct sound from this source?
I'm using the latest Lav filter and it works great with ffdshow.

Please define "correct sound" :)

Also, and IMHO, 192kbps :confused: is not sufficient bitrate for 5.1 channels...
So you have either a buggy version of MediaInfo, or a bad AC3 stream...

Codec ID : A_AC3
Duration : 1h 51mn
Bit rate mode : Constant
Bit rate : 192 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Bit depth : 16 bits

[Kurtnoise]

Without sample, this doesn't mean nothing...

[jebediah]

Please define "correct sound" :)

Also, and IMHO, 192kbps :confused: is not sufficient bitrate for 5.1 channels...
So you have either a buggy version of MediaInfo, or a bad AC3 stream...

There's no sound at all, but every 5 sec or so there's a short popping sound.

[filler56789]

There's no sound at all, but every 5 sec or so there's a short popping sound.

Then please demux the audio stream and post it to a filesharing site.
As Kurtnoise said, without a sample file, there will be no solution to the problem
(assuming that the problem is in the LAV filters, bien entendu).

[jebediah]

Then please demux the audio stream and post it to a filesharing site.
As Kurtnoise said, without a sample file, there will be no solution to the problem
(assuming that the problem is in the LAV filters, bien entendu).

That's way out of my league and i have no clue how to do that.

[ThurstonX]

That's way out of my league and i have no clue how to do that.

Can you find a tool that will allow you to edit it such that you can create a 5-10 second clip? If so, post that on a decent file sharing site and provide the link. People here love to analyze clips and provide feedback, but without a clip there are so many possibilities. Gotta meet 'em half way.

[sneaker_ger]

That's way out of my league and i have no clue how to do that.

Get mkvtoolnix and start mkvmerge GUI. Drop the file into it and uncheck everything except the audio track. Go to the "global" tab, choose "split by parts based on timecodes" and enter "-1:00" (without the quotes) under "Parts". Now start muxing and upload the resulting file to a service like file-upload.net (http://en.file-upload.net/).

[shadowdogg]

Doesn't seem to be able to handle Dolby Atmos track on transformers extinction, it just reads at dolby digital 5.1

[mastan]

Geforce GTX 980 video decoding speed:
http://www.3dnews.ru/assets/external/illustrations/2014/09/19/902100/dxva.png

Looks like 4K hw decoding is finally coming!

[nevcairiel]

Its the same video decoder the 750 (Ti) had, not really "news", but it is plenty fast.

[User 2014]

i've a noob question: why ffmpeg doesn't add dts audio codecs? (only supports dts)

[Elbart_]

Bug with LAV Splitter (at least 0.58.2 and newer) playing WebM made from GIFs:

1.) Convert test.gif to test.webm with ffmpeg using:
ffmpeg -i test.gif -an -c:v libvpx test.webm

2.) Play it in MPC-HC (1.7.0 and newer) using the built-in Matroska Source Filter (which is using LAV Splitter).

3.) The video will look something like this: http://i.imgur.com/CTA8EYc.png

In Firefox, Chrome, ffplay, VLC and MPC-HC using Haali's Splitter, the video is playing fine.

test.gif and already encoded test.webm can be found here: https://www.mediafire.com/folder/yk7ur0ewnkilk/LAVSplitter_GIF_WebM-Matroska

[wanezhiling]

Doesn't seem to be able to handle Dolby Atmos track on transformers extinction, it just reads at dolby digital 5.1

I cut a sample file: https://www.sendspace.com/file/m2106p

[PetitDragon]

Will there be any Dolby ATMOS integrated TrueHD software decoder soon in the near future?

[LigH]

This implies the question: Is a decoding algorithm already publicly known?

But documentation is only one factor. Legal state (license protection) may be another.

[nevcairiel]

Those TrueHD tracks should play again in the latest Git version, I've also send a patch for this to the ffmpeg mailing list, and its included in their repository as well now.

[clsid]

Which GPUs support the new HEVC acceleration? Just the second gen Maxwell cards, or also older ones like the 750 Ti?

[nevcairiel]

No idea about the 750, since its somewhat slow, but high-end Kepler cards like my 780 also support it.

[DragonQ]

No idea about the 750, since its somewhat slow, but high-end Kepler cards like my 780 also support it.
As far as I can tell, there are no nVidia cards with pure hardware HEVC decoders. Some of the newer ones feature a "hybrid" decoder, which basically does all of the parts that overlap with AVC decoding in hardware and the rest in software. I suppose that counts as acceleration but how does it compare with the newly-optimised HEVC decoding in ffmpeg that you added to the nightly builds recently?

The 970/980 do have a full HEVC hardware encoder though.

[nevcairiel]

Thats why it only works on high-end Kepler cards, it needs a certain amount of shader performance to do it, and also why I'm not sure it would work on the 750.

[SeeMoreDigital]

Which GPUs support the new HEVC acceleration? Just the second gen Maxwell cards, or also older ones like the 750 Ti?I asked the same question myself last month... (http://forum.doom9.org/showthread.php?t=170987) Given the speed that HEVC decoders have made it into televisions, I find it odd that they've not made it into GPU's :eek:

[nevcairiel]

TVs are huge devices, you can just plug a new chip in some corner of the thing and call it a day. A GPU needs to incorporate the decoding function into its own silicon, sounds like a much more complicated task.

[foxyshadis]

Will there be any Dolby ATMOS integrated TrueHD software decoder soon in the near future?

It took about a year and a half for an open source decoder for TrueHD to be written, so I'd expect roughly 1-2 years for Atmos, unless someone is truly dedicated.

[nevcairiel]

Considering that Atmos is not even a "normal" audio codec as such, probably longer.
We don't even have a bitexact DTS-HD MA decoder in open-source yet, and that format is way old now!

[Megalith]

Okay, I'm a complete noob at this. How would I go about updating the internal LAV filters in MPC so TrueHD tracks with Atmos can play correctly? I'm looking at the Git page but am not sure what files I need.

[huhn]

you can't update the internal filter in mpc-hc you need a new version of mpc hc for this.

you can build a lavfilter with "atmos" "decoding" support by following this:
Compiling
=============================
Compiling is pretty straight forward using VC++2013 (included project files).
Older versions of Visual Studio are not supported.

It does, however, require that you build your own ffmpeg and libbluray.
You need to place the full ffmpeg package in a directory called "ffmpeg" in the
main source directory (the directory this file was in). There are scripts to
build a proper ffmpeg included.

I recommend using my fork of ffmpeg, as it includes additional patches for
media compatibility:
http://git.1f0.de/gitweb?p=ffmpeg.git;a=summary

libbluray is compiled with the MSVC project files, however a specially modified
version of libbluray is required. Similar to ffmpeg, just place the full tree
inside the "libbluray" directory in the main directory.

You can get the modified version here:
http://git.1f0.de/gitweb?p=libbluray.git;a=summary

maybe the next nightly in mpc-hc gets this new lavfilter version.

[Arm3nian]

I can't seem to play Age of Extinction. Everything else works with my settings in mpc-be. Tried just a clean install of mpc-hc and no video/audio in there either. It says playing but stays at the 0 time stamp. I can click around and get different frames in the video but it doesn't play. The video does play in a clean install of VLC however.

[Megalith]

you can't update the internal filter in mpc-hc you need a new version of mpc hc for this.

you can build a lavfilter with "atmos" "decoding" support by following this:


maybe the next nightly in mpc-hc gets this new lavfilter version.

Guess I'll just wait for the next MPC-HC update, then.

I can't seem to play Age of Extinction. Everything else works with my settings in mpc-be. Tried just a clean install of mpc-hc and no video/audio in there either. It says playing but stays at the 0 time stamp. I can click around and get different frames in the video but it doesn't play. The video does play in a clean install of VLC however.

It's because of the Atmos track. It should play fine if you select the 640 kbps lossy audio track.

[wanezhiling]

Latest lav (http://pan.baidu.com/s/1gd1its3#dir/path=%2F%E8%87%AA%E7%BC%96%E8%AF%91%E8%BD%AF%E4%BB%B6)

[Sparktank]

Latest lav (http://pan.baidu.com/s/1gd1its3#dir/path=%2F%E8%87%AA%E7%BC%96%E8%AF%91%E8%BD%AF%E4%BB%B6)

Leads to a blank page with Chinese characters that are not clickable.
All my plugins are disabled and it's still an unusable page for me.

EDIT: works in chrome.
Just not Palemoon (Firefox variant)

[User 2014]

nevcairiel, please add default button to each tab of your lav decoders & splitters.

[foxyshadis]

you can't update the internal filter in mpc-hc you need a new version of mpc hc for this.

you can build a lavfilter with "atmos" "decoding" support by following this:


maybe the next nightly in mpc-hc gets this new lavfilter version.

mpc-hc nightlies never get nightly LAV filters, they always use stable. Wait for nev to release a new preview (which should be better tested) or try wanezhiling's, but you have to disable the internal filters in mpc-hc first.

[sneaker_ger]

mpc-hc nightlies never get nightly LAV filters, they always use stable.
Not true (https://github.com/mpc-hc/mpc-hc/commit/12cf1a98232192b07a3e2215f615a24a848585df). But they don't have the new Nvidia HEVC stuff yet.

[wanezhiling]

http://i.imgur.com/zCI3H9y.jpg

Is it really working? :)

[nevcairiel]

If it says active then of course its working.
Please don't post giant screenshots though.

[wanezhiling]

But 'Video Engine Load' in GPU-Z is still zero...
Hmmm.. why?

[nevcairiel]

You should read what "Hybrid HEVC decoding" means. =)

[wanezhiling]

:o Oh it eats shaders...

So now we can say that lav is the world's first h265 hw decoder?:p

[NikosD]

Kudos to nevcairiel for HEVC hybrid decoder.

My first tests with signature system - HD 4600@1200MHz - using HEVC DXVA2 decoder show that it's limited by GPU power.

It can decode even 4K HEVC but with low bitrate and low fps clips.

Definitely slower than CPU HEVC, at least on my Core i7-4790 using latest HEVC CPU optimizations, probably more useful for laptops or desktops with HD 4600 and slower CPUs.

HEVC DXVA2 could be faster than those CPUs using HD 4600 and can be used in situations where CPU is utilized at max, during CPU HEVC decoding.

I will try Intel's GPA monitor tool later, in order to check out if any fixed-function HW is used (QuickSync), but from the decoding speed, it's almost impossible.

The power usage using HEVC DXVA decoder was 3 times more (!) than using pure CPU on signature system for 4K HEVC clips.

[wanezhiling]

http://i.imgur.com/H9v5WvY.jpg
Even 10-bit hevc materials can be also decoded with cuvid mode??:confused:

[nevcairiel]

I see no evidence that its 10-bit. But no, 10-bit doesn't really work.

[wanezhiling]

General
ID : 0 (0x0)
Complete name : D:\Videos\HD\Test\[三星专用.4K.演示片] UHD 4+3混搭.ts
Format : MPEG-TS
File size : 1.38 GiB
Duration : 3mn 51s
Overall bit rate mode : Constant
Overall bit rate : 51.4 Mbps

Video
ID : 257 (0x101)
Menu ID : 1 (0x1)
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5.2
Codec ID : 36
Duration : 3mn 50s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate : 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 10 bits
Writing library : ATEME Titan KFE 3.5.1 (4.5.1.0)

Maybe just an accident, hehe..

[Elbart_]

Added another test-file "test2" to https://www.mediafire.com/folder/yk7ur0ewnkilk/LAVSplitter_GIF_WebM-Matroska (mentioned here (http://forum.doom9.org/showthread.php?p=1694320#post1694320)).

Apparently playback is only broken up until a "hard" scene-change, after which the video is played back just fine, until it hits the next problem.

And I added "test3", which shows all kinds of brokenness when played with LAV Splitter.

[nevcairiel]

Should be fixed in the next version.

[truexfan81]

if it eats shaders, how would it affect those of us that are pushing the limit with madvr?