LAV Filters - DirectShow Media Splitter and Decoders

[el Filou]

Originally Posted by *MidnightWatcher*

If I only install the LAV Video Decoder 0.75 and keep the splitter and audio decoder at 0.74.1, the videos streamed via FTP play immediately, but if the splitter or audio decoder 0.75 are installed, it takes about 20 seconds before the video begins playing.

I know this could be a bit time consuming, but what you could do is try to install each of the nightlies here: https://files.1f0.de/lavf/nightly/0.74/ and see after each upgrade/downgrade if the problem appears/disappears.
Proceed using a sort of "divide search": install a build from the middle of the list, like 0.74.1-59, check if the problem happens, if it does then the issue was introduced in a build between 0.74.1 and that one, if it doesn't it was in a later one, then repeat the same process with the smaller resulting selection.
At worst it should take you only installing 6 of those to pinpoint which one exactly introduced the issue.
Then you can see all the codes changes that happened here: https://github.com/Nevcairiel/LAVFil....74.1...master and hopefully find something that explains it and nev can take a look at it.

Originally Posted by RealSnoopyDog

It would be helpful to know for which file format this happens for you. I don't have problems where starting a video stream takes 20 seconds or more on a network storage. They all start immediately (plain mpeg and mkv)

What protocol? Maybe it only affects FTP.

[*MidnightWatcher*]

Originally Posted by RealSnoopyDog

It would be helpful to know for which file format this happens for you. I don't have problems where starting a video stream takes 20 seconds or more on a network storage. They all start immediately (plain mpeg and mkv)

All my videos are mkv.

[*MidnightWatcher*]

Originally Posted by SeeMoreDigital

When was the last time you disabled the mains power from all your gear, waited between 30 to 60 seconds, and switched everything back on again!?

My Synology NAS was behaving strangely a few weeks ago after an update. After "switching it off and on again"... It's working fine

It plays fine with 0.74.1, but not with 0.75. If it were the server I'd have issues regardless of version.

[nevcairiel]

Does it actually use LAV Splitter to access the FTP server, or is it using an external URL Source Filter? More information is more better.

PS:
Issues are not always as straight forward as you might think. Restarting your NAS takes you as much time as declaring that its not the cause.

[*MidnightWatcher*]

Originally Posted by nevcairiel

Does it actually use LAV Splitter to access the FTP server, or is it using an external URL Source Filter? More information is more better.

PS:
Issues are not always as straight forward as you might think. Restarting your NAS takes you as much time as declaring that its not the cause.

Hi nev, I restarted the FTP server and still the same.

I'm using Kodi with MPC-BE as the external player, and MPC-BE is set up to use only LAV for splitter, audio, video. They are all active in the task bar also when a video is playing. Does this answer your question?

[clsid]

MPC-BE Menu > Play > Filters

It is probably using "File Source (URL)", which may be caching the whole file before playback starts.

You can edit this registry key to change the source filter:
HKEY_CLASSES_ROOT\ftp
LAV = {B98D13E7-55DB-4385-A33D-09FD1BA26338}

[*MidnightWatcher*]

Originally Posted by clsid

MPC-BE Menu > Play > Filters

It is probably using "File Source (URL)", which may be caching the whole file before playback starts.

You can edit this registry key to change the source filter:
HKEY_CLASSES_ROOT\ftp
LAV = {B98D13E7-55DB-4385-A33D-09FD1BA26338}

MPC-BE 1.5.7.6005

Filters currently loaded:
- Default DirectSound Device
- XySubFilter (=> madVR)
- madVR Renderer
- Audio Switcher
- LAV Video Decoder
- LAV Audio Decoder
- LAV Splitter Source

I tried updating FTP Source Filter value data in the registry as suggested, but still takes 20 seconds to start playing a video.

[biship]

For me playing files from my Synology NAS it takes 5-7s before the video starts, and oddly, the screen is also blank for the first 5s of the video. I can hear the audio. All MKVs.

[*MidnightWatcher*]

Originally Posted by biship

For me playing files from my Synology NAS it takes 5-7s before the video starts, and oddly, the screen is also blank for the first 5s of the video. I can hear the audio. All MKVs.

It takes 5-7 second before playing, plus another 5 seconds for the video to be displayed? Curious -- is your connection "fast ethernet" (10/100) or gigabit (10/100/1000)? The blanking sounds like your display is adjusting to the frame/refresh rate. My JVC projector takes about 6 seconds, which is normal.

[clsid]

@nevcairiel
I am debugging a hang in m_pDXVA2Allocator->GetBuffer()
The free list is empty/null and m_lCount=m_lAllocated=23

I assume that this situation of all buffers being in use should not happen under normal conditions?
This problem occurred for a user with heavy GPU usage by Firefox. Could it be that a buffer is not freed (or re-used) when a failure occurs somewhere in the DXVA2 code (of FFmpeg)?