LAV Filters - DirectShow Media Splitter and Decoders

[nevcairiel]

Problem with "LAV Splitter Source" & "LAV Splitter". This DASH(AVC)-video stop automatically after try to starts:
https://www.dropbox.com/s/5ydixpwtg9rnl4z/%D0%9A%D0%B0%D0%BB%D0%B5%D1%82%D0%B8%D0%BD%20%D0%90%D0%BD%D0%B4%D1%80%D0%B5%D0%B9.mp4?dl=0

Any feedback would be appreciated.

The file plays fine here with the latest nightly version.

[videoh]

Maybe Nev can shed some light. Apparently not.

[nevcairiel]

If using "LAV Splitter Source" stream playback reload from start after returning from pause state. Steps to reproduce:
1. Add "LAV Source" to GraphStudio, use "http://podcast.dimitrysmirnov.ru/blog/wp-content/uploads/2017/02/propoved-82258/propoved-82258_i.mp4" as the URL.

Try with tomrrows nightly version, I enabled reconnect for http connections.

[nevcairiel]

Apparently not.

I tried the most basic YV12 script, something like:

Version()
ConvertToYV12()

And it plays fine in latest MPC-HC. Even more so if you install stand-alone LAV Filters, as it will then use LAV Video to convert the video, instead of relying on a system I420 codec.

So whatever is wrong, is on your end. You didn't exactly give much information other then "it doesn't work" though, so there is nothing i can do.

[sneaker_ger]

@videoh
Which AviSynth version are you using?

[videoh]

Avisynth+ 2085

[Kadano]

I downloaded a version of LAV Filters that allows setting a priority chain for Hardware Decoders (see screenshot below). However, I don't remember where I found it, and I can't find it with Google any longer. Yet I want to install it on a different PC too. Does anybody know where this version is being released?

http://i.imgur.com/poCT6A3.png

[clsid]

That is tmod version:
http://tmod.nmm-hd.org/LAVFilters/
But chain is usually pointless. Just use DXVA2 copyback.

Avisynth+ 2085
Here you can get a newer version:
http://avisynth.nl/index.php/AviSynth%2B

[videoh]

Thanks, clsid, I'll try it out today. These are just my growing pains from moving to Win10. :rolleyes:

[max79]

to sneaker_ger:
I don't understand what do you mean "forced"? My settings:
[HKEY_CURRENT_USER\Software\LAV\Splitter]
"substreams"=dword:00000000
"prefAudioLangs"="rus,eng"

If one of the two remaining questions the answer was- "Yes", then the same problem would be with other types of containers.

Info from "MediaInfo" about .MKV-file with two RUS-audio tracks:
Audio Menu ID: 1(have AC3 format)
Audio Menu ID: 2(have DTS HD MA format)

[sneaker_ger]

In MKV tracks can be marked as "default" and "forced". If the AC3 track is marked "default" that will have priority over quality.

https://abload.de/img/lav_mkv_default_flag_nzutj.jpg
MediaInfo should also show those flags. Unfortunately, you cut the log down...

the same problem would be with other types of containers.
Post a sample if that is the case.

[max79]

to sneaker_ger:
Thank you! I got an answer to my question)
If so, why I have no problems with other types of containers? And if the AC3 track is marked "forced" and not "default" what is the difference in that case?

[nevcairiel]

No other container defines a "Default" stream flag, only Matroska does - and LAV listens when its set. "Forced" is only used for subtitles by LAV, on an audio stream it doesn't have any impact.

[LigH]

@ max79:

You can inspect (and change) MKV container flags with the MKVToolnix GUI. (Also with mkvpropedit and some GUI for it, but that's rather outdated now, and not so user friendly, editing XML control files etc.)

[max79]

Why these HLS-streams stoped after few minutes?:
http://www.djing.com/tv/live.m3u8
http://www.djing.com/tv/animation.m3u8
http://www.djing.com/tv/classics.m3u8
http://www.djing.com/tv/dancefloor.m3u8
http://www.djing.com/tv/underground.m3u8

I can play it only through this:
https://www.hlsplayer.net/

to LigH:
Thank you for information!

Any feedback would be appreciated.

[nevcairiel]

Streaming support is provided "as is", it either works or it doesn't. Streaming doesn't fit very well into the current design of LAVs internals (its designed for file playback).

[Helios61]

LAV: 0.69.0
Mediaportal 1 current version
INTEL HD 4600 HD Audio
HDMI Connection HTPC -> Yamaha RX-V681



Hi @nevcairiel, Hi @all
I've noticed a lot of audio dropouts while playback of live tv (DVB/C) in Mediaportal with RTL TV, only the AC3 stream. With other stations and MPEG audio streams all is working fine. LAV Audio AC3 bitstreaming is configured in MediaPortal 1.
Testfile ->Link (https://www.dropbox.com/s/sak22gpwjt0c236/Der%20Blaulicht%20Report.ts?dl=0)<-

Have made some tests:
1. Playback in MP with LAV Audio (passthrough): Drop Outs
2. Playback in MP with AC3Filter (passthrough): Drop Outs
3. Playback in MP with MS DTV-DVD Audio (passthrough): Playback is fine
4. Have demuxed the audio stream from the .ts container. Playback of the ac3 stream in Foobar2000 (WASAPI) ist working fine without drop outs. In MPC/HC (LAV Audio) again dropouts.

Could you please look at this behaviour?

Best regards
Helios

[max79]

to nevcairiel:
I'm checked. In v0.69.0.18-git my SUPPORT REQUEST - #1 not(!) fixed. :(
And my SUPPORT REQUEST - #4 fixed now. :)

[max79]

Problem with "LAV Splitter Source" but only just in information delivery about audio channels. It's show 5.1ch but E-AC3_Audio-file[http://s1.demo-world.eu/hd_trailers.php?file=dolby_digital_plus_channel_check_lossless-DWEU.mkv] have 7.1ch(please see pic in attachment). Anyway this DD+ file plays correctly through "LAV Splitter Source"+"CyberLink Audio Decoder (PDVD Generic)[v9.4.0.2221]".
https://forum.doom9.org/attachment.php?attachmentid=15846&d=1491692385

Any feedback would be appreciated.

[max79]

Problem with "LAV Audio Decoder". It's show 5.1ch but E-AC3_Audio-file[http://s1.demo-world.eu/hd_trailers.php?file=dolby_digital_plus_channel_check_lossless-DWEU.mkv] have 7.1ch. And plays BACK channels in SIDE channels(please see pic in attachment).
https://forum.doom9.org/attachment.php?attachmentid=15847&d=1491692662
https://forum.doom9.org/attachment.php?attachmentid=15848&d=1491692670

Any feedback would be appreciated.

[sneaker_ger]

ffmpeg decoder doesn't decode eac3 substreams. You have to bitstream or use a different decoder. Activate "Use legacy 5.1 channel layout" to output back instead side.

[max79]

to sneaker_ger:
I think you are wrong! Look at my pic from my SR-#7: Codec = eac3. All DD+ audio files with 5.1ch plays fine! Problem only with DD+ 7.1ch.

[huhn]

looks like an ffmpeg limitation: https://trac.ffmpeg.org/ticket/4608
bitstreaming should work fine.

adding attachments doesn't mean we can see them.

[nevcairiel]

Please test these streams with ffmpeg, if it outputs 5.1 there, then you should report the problem there. LAV just uses ffmpeg for decoding, it doesn't implement its own decoders.
As sneaker_ger has said, dependent substreams (ie. as found on Blu-ray EAC3 tracks) are not supported, which is often used for 7.1

PS:
"Side" is the default 5.1 surround channel for Dolby codecs.

[nevcairiel]

Hi @nevcairiel, Hi @all
I've noticed a lot of audio dropouts while playback of live tv (DVB/C) in Mediaportal with RTL TV, only the AC3 stream. With other stations and MPEG audio streams all is working fine. LAV Audio AC3 bitstreaming is configured in MediaPortal 1.
Testfile ->Link (https://www.dropbox.com/s/sak22gpwjt0c236/Der%20Blaulicht%20Report.ts?dl=0)<-

The stream seems to be broken (the frame CRCs don't match on the audio frames with glitches). Did you have bad reception when recording it?

[max79]

to huhn:
Sorry. I didn't know. Now i'm fix that.

[sneaker_ger]

You can't fix attachments. A moderator needs to approve them manually and that often takes days. That's why most people here upload to external hosters instead. (like imgur.com, abload.de for images or sendspace.com, mediafire.com, mega.nz for other files)
But in this case we probably don't need your screenshots. You know it's an ffmpeg feature limitation.

[max79]

to nevcairiel:
I'm checked. In v0.69.0.20-git my SUPPORT REQUEST - #1 still did not fixed...

[nevcairiel]

Repeatedly asking will also not fix it. LAV Filters is provided "as is", I cannot fix every obscure use-case immediately, sorry.
Feel free to send a patch that fixes it.

[Helios61]

The stream seems to be broken (the frame CRCs don't match on the audio frames with glitches). Did you have bad reception when recording it?
It is german Unitymedia cable TV. Quality and signal strength are 100%. TV card is Digital Devices cine DVB-C/C2/T2.

[nevcairiel]

Well, the stream still appears to be corrupt, the checksums don't match for a bunch of audio frames. Can't really try to improve playback if the first message i get is wrong frame checksums - who knows what happened to the stream exactly.

[manolito]

@Helios61

Your stream is MPEG2-TS, and these streams ALWAYS need to be converted to PS elementary streams (with PropjectX or PVAStrumento. I prefer ProjectX).

I ran your file through ProjectX, and for the AC3 stream there were many complaints about missing sync words. But after ProjectX had repaired the audio and I remuxed it to an MPEG2 program stream it played perfectly, no dropouts and no sync problems.

Looks like UnityMedia is sending out corrupt AC3 streams...


Cheers
manolito

[manolito]

@nevcairiel

Since the good old DVB-T is history (in Germany), I do have lots of problems with DVB-T2... :mad:

I decode the files (mTS container, HEVC video, audio either eac3 or aac-latm) using LAVFilters with DSS2Mod. Basically this works, but it looks like leading B-Frames cannot be decoded. See this post by Mr. Cypheros (TS-Doctor):
https://cypheros.de/forum_ger/index.php?PHPSESSID=79ba096d4857235c2d131cc16234f552&topic=3702.msg25288#msg25288

Is this true? I mean, is LAV splitter to blame?


Cheers
manolito

[LigH]

Sounds like a usual "open GOP" issue? To support easy channel switching, video streams should be encoded with closed GOPs, I believe; but that reduces efficiency slightly...

[sneaker_ger]

Here (https://drive.google.com/open?id=0B5YjHFt4OQFFb2tlTy1INXFzZDQ)'s a recent sample if needed. Seeking breaks the picture until what I assume is the next keyframe. (And only one program can be used but IIRC that's by design/a known LAV limitation.)
MPC-BE splitter + LAV Video works fine.

[nevcairiel]

The FFmpeg TS demuxer does not offer such functionality (it doesn't know what kind of frames are in the stream, since thats codec dependent information and mpeg-ts itself does not carry such flags), and I do not currently plan to work on this myself.
I could maybe hide the frames (like h264 does) if that makes you feel better? :) It would still start decoding a "proper" image at the same spot as it does now though.

MPEG-TS is generally not a format you should expect "perfect" seeking on, because the format itself has basically no seeking support. Even finding the appropriate timecode in the file is already a slow process, and with broadcast streams can even be really annoying (ie. with wrap-around).

[manolito]

@sneaker_ger

Your sample is even nastier than the files I get from my new Xoro DVBT2 receiver... :mad:

MediaInfo reports 7 video and audio streams. Pretty weird already. Repacking it to MKV using the current MKVMerge works without errors, but the resulting MKV does not show any video, neither in VLC nor in DirectShow based players.

Using FFmpeg to repack the file to MKV does work, but I get a nasty A/V sync error. I need to determine the delay manually, taking the values from MediaInfo does not work.

I need to convert my HEVC TV captures to AVC because my streaming box (XTreamer Sidewinder) does not support HEVC, and I desperately need to develop an automatic way to make these conversions. Looks like I got some work ahead of me...

Cheers
manolito

[Helios61]

Well, the stream still appears to be corrupt, the checksums don't match for a bunch of audio frames.


Looks like UnityMedia is sending out corrupt AC3 streams...

The issue seems to be over. I didn't have noticed dropouts within the last days.
Big Thanks for yor support @nevcairiel and @manolito

[oddball]

I've just reinstalled Windows 10 Creators Update and I can't seem to get subs to NOT display using XYSubFilter with MPC-BE. Normally I put eng:eng|f;eng:off;*:eng;*:* in both the audio and subtitle fields under 'Advanced' in LAV Splitter. But it's not working. Subs are displaying no matter what.

Any ideas?

[sneaker_ger]

Do you have "Default track preference" ticked in MPC-BE "Options">"Playback"? It overrides LAV's selection.

P.S.: audio priority is only simple like e.g. "eng,jap,spa" ..., only subtitle field accepts pairs

[oddball]

Do you have "Default track preference" ticked in MPC-BE "Options">"Playback"? It overrides LAV's selection.

P.S.: audio priority is only simple like e.g. "eng,jap,spa" ..., only subtitle field accepts pairs

That may be why and I am sure I have asked this before and forgot about it :)

[Budtz]

I get presentation glitches in madvr (one every 5 minutes) with dxva copy back but not cuvid? What could cause this?

[Budtz]

I get presentation glitches in madvr (one every 5 minutes) with dxva copy back but not cuvid? What could cause this?

I think setting my gtx1060 to optimal performance fixes the issue. but this kind of nagates the point of using dxva in the first place since my cpu can handle 1080p just fine.

any1 got any experiance in this?

[Asmodian]

It is an Nvidia driver issue, while adaptive often works well the optimal power mode(s) can be too aggressive when saving power.

[nevcairiel]

Using CUVID puts your GPU into high performance mode at all times, thats the only reason it sometimes is perceived as "better" - you can however do the same setting in the control panel regardless of decoder API used.
So yes, put your card into Adaptive mode, avoid Optimal Power.

[Budtz]

thx for the info. I wonder how many turns this stuff on who dont need it thinking it gets things running more effeciently when really - unless the cpu cant handle the decoding - its drains more power

lots of sites and forums recommand turning it on to save resourses - seems it most likely will do the opposate on a modern desktop pc

I need it for HECV 4k material but its so far and few between im cosidering running decoding of the cpu to save the resourses.

I cant get HECV 4k matirial to decode. does cuvid not support this? is that why I couldnt get it to work?

I see lots of older sites saying cuvid is the best but i have a feeling that nowadays its dxva thats best

[sneaker_ger]

I need it for HECV 4k material but its so far and few between im cosidering running decoding of the cpu to save the resourses.
Only tick the respective "UHD 4K" and "HEVC" boxes in LAV Video. It's automatic, then.

I cant get HECV 4k matirial to decode. does cuvid not support this? is that why I couldnt get it to work?

I see lots of older sites saying cuvid is the best but i have a feeling that nowadays its dxva thats best
DXVA2 (copy-back) is recommended. CUVID can be problematic.

But what exactly do you mean by "I cant get HECV 4k matirial to decode."? Only CUVID? Not at all? Black screen? Error message? Software fallback (see "active decoder" in LAV settings during playback)? OS? HEVC 8 bit or 10 bit or 12 bit ... ?

[Budtz]

Only tick the respective "UHD 4K" and "HEVC" boxes in LAV Video. It's automatic, then.

Thats a good idea. thou i have set my card to run at max performance for dxva to be stable so i guess its using the resourses anyway

DXVA2 (copy-back) is recommended. CUVID can be problematic.

But what exactly do you mean by "I cant get HECV 4k matirial to decode."? Only CUVID? Not at all? Black screen? Error message? Software fallback (see "active decoder" in LAV settings during playback)? OS? HEVC 8 bit or 10 bit or 12 bit ... ?

checking active decoder its not using hardware decodoing. i get no balck screens or anything - it just uses software which resaults in 100% cpu usage

i can only get lav to decode the 4k hevc files using dxva copy back

[nevcairiel]

As sneaker_ger suggested, your video is likely 10-bit then, which CUVID does not support properly at this time (still waiting for NVIDIA to release the new Video Codec SDK).
In anycase, as mentioned above, DXVA is generally favorable for decoding.

[nevcairiel]

I've been working the last couple days on refactoring some internals of LAV Video to reduce overhead and make it more efficient, as well as generally cleaning up the code and updating to newer API standards of FFmpeg.
There is still some more work to come, but the big chunks are done. As a result, video decoding in basically all modes is slightly faster (except DXVA2-Native, which stays mostly the same, as it by-passed much of the logic already).

The catch is that I refactored *a lot* of the internals of the LAV Video avcodec module (primary software decoder, and also for the DXVA2 modes), and it is possible that there are new bugs in there that I did not find yet. So to everyone using nightly builds, it would be greatly appreciated if you would report any issues that appear in todays nightly (0.69.0-32 and newer), which did not occur before - either with earlier nightlies, or the 0.69 release.

You can find the latest nightly here:
https://files.1f0.de/lavf/nightly/

The changes I described are in 0.69.0-32 and newer builds.