No snapshots possible during transcoding AND previewing

[nmi]

Hi,
i'm using VLC 2.0.6 to transcode and preview a videosignal from an usb-grabber with windows 7 (same problem with windows 10).
It's a fresh install of vlc an a clean vlcrc file.

The process is started with the following command line:

start vlc.exe dshow:// :dshow-vdev="USB Capture DVI+" --snapshot-path=D:\GE\temp\ --snapshot-prefix=tempSnapshot --snapshot-format=jpg --sout=#transcode{venc=ffmpeg,vcodec=mp2v,vb=8001,fps=25.0,threads=4,width=1280,height=720}:duplicate{dst='standard{access{file,append},mux=ts,dst=D:\GE\temp\tempView2.mpg}',dst=display}

My problem is, that i cannot take snapshots. The menu items are grayed out and so also the hotkey for snapshot doens't function.

I tried disabling all the points of hardware acceleration i can find, no changes.
Preferences->Video->Use Hardware Acceleration
- (# Use hardware YUV->RGB conversions (boolsche (logisch)) -> directx-hw-yuv=0)
- (# Overlay video output (boolsche (logisch)) -> overlay=0)
Preferences->Input & Codecs->Videocodecs->Hardware decoding
- (# Hardware decoding (boolsche (logisch)) -> ffmpeg-hw=0)

Any idea?

I also tried other 2.x versions, but the probelms stays the same.

A test with the actual version 3.0.1 with the above shows no video and and also do no transcoding. If anybody can tell me how to do this with version 3.0.1 (or any other version) i would be happy.

The only functinal version is 1.1.11, but with the used grabber this version of VLC is very unstable an crashes after a short time.

Thank you for helping and sorry for my bad english...
nmi

[nmi]

Addition (tested with version 2.1.5 and 2.0.8, think it would be the same with the other 2.x versions):

I have the same problem if i try to convert AND display an video from usb-grabber like this:

-> Media
-> Open Capture Device
-> Select Video Device "USB Capture DVI+"
-> Convert
-> select "Display the output"
-> select any profile
-> choose an destination file
-> press "Start" Button

Video is displayed an an video file will be created at the choosen destination.

But: the whole submenu of "Video" except the Submenu "Video Track" is disabled an subsequently i CANNOT produce a snapshot....

If i only do the following, i CAN produce a snapshot (but logically no video file from the grabber is generated):

-> Media
-> Open Capture Device
-> Select Video Device "USB Capture DVI+"
-> Play

I hope somebody can help to fix that...
nmi

[Jean-Baptiste Kempf]

Can you play the capture device in VLC 3.0?

[nmi]

Hi,
sorry for late answer...

No, it's not possible to transcode and simultaneously show an video taken from a directShow device. Tried with another grabber today, same result (with the win32 versions "3.0.0", "3.0.1" and nightly build "vlc-4.0.0-20180311-0303-dev-win32".

I have extended the batch file with additional entries so now it writes an logfile.

Code: Select all

start vlc.exe dshow:// :dshow-vdev="USB2.0 Grabber" --snapshot-path=D:\GE\temp\ --snapshot-prefix=tempSnapshot --snapshot-format=jpg :dshow-aspect-ratio=4\:3 :dshow-size=720x576 :dshow-fps=25.0 :dshow-video-input=1 --extraintf=logger --verbose=2 --logmode=text --file-logging --logfile=D:\GE\temp\vlc.log :sout=#transcode{venc=ffmpeg,vcodec=mp2v,vb=6000,fps=25.0,threads=4,width=720,height=576}:duplicate{dst={standard{access{file,append},mux=ts,dst=D:\GE\temp\tempView4.mpg}},dst=display}

This is the content of the logfile created with the "3.0.0" version (i hope it's ok to post the logfile in this way).

nmi



-- logger module started --
main debug: VLC media player - 3.0.0 Vetinari
main debug: Copyright © 1996-2018 the VideoLAN team
main debug: revision 3.0.0-2-0-gaf3950764d
main debug: configured with ../extras/package/win32/../../../configure '--enable-update-check' '--enable-lua' '--enable-faad' '--enable-flac' '--enable-theora' '--enable-twolame' '--enable-avcodec' '--enable-merge-ffmpeg' '--enable-dca' '--enable-mpc' '--enable-libass' '--enable-x264' '--enable-schroedinger' '--enable-realrtsp' '--enable-live555' '--enable-dvdread' '--enable-shout' '--enable-goom' '--enable-caca' '--enable-qt' '--enable-skins2' '--enable-sse' '--enable-mmx' '--enable-libcddb' '--enable-zvbi' '--disable-telx' '--enable-nls' '--host=i686-w64-mingw32' '--with-breakpad=https://win.crashes.videolan.org' 'host_alias=i686-w64-mingw32' 'PKG_CONFIG_LIBDIR=/home/jenkins/workspace/vlc-release/windows/vlc-release-win32-x86/contrib/i686-w64-mingw32/lib/pkgconfig'
main debug: using multimedia timers as clock source
main debug: min period: 1 ms, max period: 1000000 ms
main debug: searching plug-in modules
main debug: loading plugins cache file D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\plugins\plugins.dat
main warning: cannot read D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\plugins\plugins.dat: No such file or directory
main debug: recursively browsing `D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\plugins'
main debug: plug-ins loaded: 488 modules
main debug: opening config file (C:\Users\Norbert\AppData\Roaming\vlc\vlcrc)
main debug: looking for logger module matching "any": 2 candidates
file debug: opening logfile `D:\GE\temp\vlc.log'
main debug: using logger module "file"
main debug: translation test: code is "en_GB"
main debug: looking for keystore module matching "memory": 3 candidates
main debug: using keystore module "memory"
main debug: CPU has capabilities MMX MMXEXT SSE SSE2 SSE3 3DNow! FPU
main debug: Creating an input for 'Media Library'
main debug: Input is a meta file: disabling unneeded options
main debug: using timeshift granularity of 50 MiB
main debug: using timeshift path: C:\Users\Norbert\AppData\Local\Temp
main debug: `file/directory:///C:/Users/Norbert/AppData/Roaming/vlc/ml.xspf' gives access `file' demux `directory' path `/C:/Users/Norbert/AppData/Roaming/vlc/ml.xspf'
main debug: creating demux: access='file' demux='directory' location='/C:/Users/Norbert/AppData/Roaming/vlc/ml.xspf' file='C:\Users\Norbert\AppData\Roaming\vlc\ml.xspf'
main debug: looking for access_demux module matching "file": 15 candidates
main debug: no access_demux modules matched
main debug: creating access: file:///C:/Users/Norbert/AppData/Roaming/vlc/ml.xspf
main debug: (path: C:\Users\Norbert\AppData\Roaming\vlc\ml.xspf)
main debug: looking for access module matching "file": 25 candidates
main debug: using access module "filesystem"
main debug: looking for stream_filter module matching "prefetch,cache_read": 24 candidates
cache_read debug: Using stream method for AStream*
cache_read debug: starting pre-buffering
cache_read debug: received first data after 1 ms
cache_read debug: pre-buffering done 304 bytes in 0s - 296 KiB/s
main debug: using stream_filter module "cache_read"
main debug: looking for stream_filter module matching "any": 24 candidates
playlist debug: using XSPF playlist reader
main debug: using stream_filter module "playlist"
main debug: stream filter added to 0391c310
main debug: looking for stream_filter module matching "any": 24 candidates
main debug: no stream_filter modules matched
main debug: looking for stream_directory module matching "any": 1 candidates
main debug: no stream_directory modules matched
main debug: attachment of directory-extractor failed for file:///C:/Users/Norbert/AppData/Roaming/vlc/ml.xspf
main debug: looking for stream_filter module matching "record": 24 candidates
main debug: using stream_filter module "record"
main debug: creating demux: access='file' demux='directory' location='/C:/Users/Norbert/AppData/Roaming/vlc/ml.xspf' file='C:\Users\Norbert\AppData\Roaming\vlc\ml.xspf'
main debug: looking for demux module matching "directory": 55 candidates
main debug: using demux module "directory"
main debug: looking for meta reader module matching "any": 2 candidates
lua debug: Trying Lua scripts in C:\Users\Norbert\AppData\Roaming\vlc\lua\meta\reader
lua debug: Trying Lua scripts in D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\meta\reader
lua debug: Trying Lua playlist script D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\meta\reader\filename.luac
main debug: no meta reader modules matched
main debug: `file/directory:///C:/Users/Norbert/AppData/Roaming/vlc/ml.xspf' successfully opened
main debug: looking for xml reader module matching "any": 1 candidates
main debug: using xml reader module "xml"
main debug: EOF reached
main debug: removing module "directory"
main debug: removing module "record"
main debug: removing module "playlist"
main debug: removing module "cache_read"
main debug: removing module "filesystem"
main debug: creating audio output
main debug: looking for audio output module matching "any": 6 candidates
mmdevice debug: using default device
mmdevice debug: version 2 session control unavailable
mmdevice debug: volume from -63.000000 dB to +0.000000 dB with 1.500000 dB increments
mmdevice debug: display name changed: VLC media player (LibVLC 3.0.0)
main debug: using audio output module "mmdevice"
main debug: keeping audio output
main debug: looking for interface module matching "logger,none": 16 candidates
logger error: The logger interface no longer exists.
logger: As of VLC version 0.9.0, use --file-logging to write logs to a file.
main debug: no interface modules matched
main error: no suitable interface module
main error: interface "logger,none" initialization failed
main debug: looking for interface module matching "hotkeys,none": 16 candidates
main debug: using interface module "hotkeys"
main debug: looking for interface module matching "globalhotkeys,none": 16 candidates
main debug: using interface module "win32"
main: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
main debug: looking for interface module matching "any": 16 candidates
main debug: looking for extension module matching "any": 1 candidates
lua debug: Opening Lua Extension module
lua debug: Trying Lua scripts in C:\Users\Norbert\AppData\Roaming\vlc\lua\extensions
lua debug: Trying Lua scripts in D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\extensions
lua debug: Trying Lua playlist script D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\extensions\VLSub.luac
lua debug: Scanning Lua script D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\extensions\VLSub.luac
lua debug: Script D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\extensions\VLSub.luac has the following capability flags: 0x5
main debug: using extension module "lua"
main debug: using interface module "qt"
main debug: processing request item: null, node: Playlist, skip: 0
main debug: rebuilding array of current - root Playlist
main debug: rebuild done - 1 items, index -1
main debug: starting playback of new item
main debug: resyncing on dshow://
main debug: dshow:// is at 0
main debug: creating new input thread
main debug: Creating an input for 'dshow://'
main debug: requesting art for new input thread
main debug: using sout chain=`transcode{venc=ffmpeg,vcodec=mp2v,vb=6000,fps=25.0,threads=4,width=720,height=576}:duplicate{dst={standard{access{file,append},mux=ts,dst=D:\GE\temp\tempView4.mpg}},dst=display}'
main debug: stream=`duplicate'
main debug: looking for sout stream module matching "duplicate": 23 candidates
duplicate debug: creating 'duplicate'
duplicate debug: * adding `standard{access{file,append},mux=ts,dst=D:\GE\temp\tempView4.mpg}'
main debug: stream=`standard'
main debug: looking for sout stream module matching "standard": 23 candidates
main debug: set config option: sout-standard-access to {file,append}
main debug: set config option: sout-standard-mux to ts
main debug: set config option: sout-standard-dst to D:\GE\temp\tempView4.mpg
main debug: looking for sout access module matching "any": 9 candidates
main warning: option file is unknown
main debug: set config option: sout-file-append to (null)
file debug: file access output opened (D:\GE\temp\tempView4.mpg)
main debug: using sout access module "file"
main debug: looking for sout mux module matching "ts": 11 candidates
main debug: looking for meta fetcher module matching "any": 1 candidates
mux_ts debug: shaping=200000 pcr=70000 dts_delay=400000
main debug: using sout mux module "mux_ts"
main debug: muxer support adding stream at any time
main debug: muxer prefers to wait for all ES before starting to mux
stream_out_standard debug: using `{file,append}/ts://D:\GE\temp\tempView4.mpg'
main debug: using sout stream module "stream_out_standard"
duplicate debug: * adding `display'
main debug: stream=`display'
main debug: looking for sout stream module matching "display": 23 candidates
main debug: using sout stream module "display"
main debug: using sout stream module "duplicate"
main debug: stream=`transcode'
main debug: looking for sout stream module matching "transcode": 23 candidates
lua debug: Trying Lua scripts in C:\Users\Norbert\AppData\Roaming\vlc\lua\meta\fetcher
lua debug: Trying Lua scripts in D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\meta\fetcher
main debug: set config option: sout-transcode-venc to ffmpeg
main debug: no meta fetcher modules matched
main debug: set config option: sout-transcode-vcodec to mp2v
main debug: looking for art finder module matching "any": 2 candidates
main debug: set config option: sout-transcode-vb to 6000
main debug: set config option: sout-transcode-fps to 25.0
main debug: set config option: sout-transcode-threads to 4
main debug: set config option: sout-transcode-width to 720
main debug: set config option: sout-transcode-height to 576
stream_out_transcode debug: Checking video codec mapping for mp2v got mp2v
stream_out_transcode debug: codec video=mp2v 720x576 scaling: 0.000000 6000kb/s
main debug: using sout stream module "stream_out_transcode"
main debug: using timeshift granularity of 50 MiB
main debug: using timeshift path: C:\Users\Norbert\AppData\Local\Temp
main debug: `dshow://' gives access `dshow' demux `any' path `'
main debug: creating demux: access='dshow' demux='any' location='' file='(null)'
main debug: looking for access_demux module matching "dshow": 15 candidates
lua debug: Trying Lua scripts in C:\Users\Norbert\AppData\Roaming\vlc\lua\meta\art
lua debug: Trying Lua scripts in D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\meta\art
lua debug: Trying Lua playlist script D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\meta\art\00_musicbrainz.luac
dshow debug: dshow-vdev: USB2.0 Grabber
dshow debug: dshow-adev:
dshow debug: width x height 720x576
lua debug: skipping script (unmatched scope) D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\meta\art\00_musicbrainz.luac
lua debug: Trying Lua playlist script D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\meta\art\01_googleimage.luac
lua debug: skipping script (unmatched scope) D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\meta\art\01_googleimage.luac
lua debug: Trying Lua playlist script D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\meta\art\02_frenchtv.luac
lua debug: skipping script (unmatched scope) D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\meta\art\02_frenchtv.luac
lua debug: Trying Lua playlist script D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\meta\art\03_lastfm.luac
lua debug: skipping script (unmatched scope) D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\meta\art\03_lastfm.luac
main debug: no art finder modules matched
dshow debug: found device: USB2.0 Grabber
dshow debug: asking for device: USB2.0 Grabber
qt debug: IM: Setting an input
dshow debug: asked for USB2.0 Grabber, binding to USB2.0 Grabber
dshow debug: using device: USB2.0 Grabber
dshow debug: EnumDeviceCaps: output pin: Capture
dshow debug: EnumDeviceCaps: input pin: Analoger Videoeingang
dshow debug: EnumDeviceCaps: trying pin Capture
dshow debug: EnumDeviceCaps: input pin default format configured
dshow debug: EnumDeviceCaps: input pin accepts chroma: YUY2, width:720, height:576, fps:25.000000
dshow debug: CaptureFilter::JoinFilterGraph
dshow debug: connecting filters
dshow debug: CaptureFilter::EnumPins
dshow debug: CapturePin::QueryDirection
dshow debug: CaptureFilter::EnumPins
dshow debug: CapturePin::QueryDirection
dshow debug: CapturePin::ConnectedTo [not connected]
dshow debug: CaptureFilter::EnumPins
dshow debug: CapturePin::QueryDirection
dshow debug: CapturePin::QueryPinInfo
dshow debug: CapturePin::ConnectedTo [not connected]
dshow debug: CapturePin::QueryPinInfo
dshow debug: CaptureFilter::EnumPins
dshow debug: CapturePin::QueryDirection
dshow debug: CapturePin::QueryDirection
dshow debug: CapturePin::QueryAccept [OK] (width=720, height=576, chroma=YUY2, fps=25.000000)
dshow debug: CapturePin::ReceiveConnection [OK]
dshow debug: CapturePin::Disconnect [OK]
dshow debug: CapturePin::QueryDirection
dshow debug: CapturePin::QueryAccept [OK] (width=720, height=576, chroma=YUY2, fps=25.000000)
dshow debug: CapturePin::ReceiveConnection [OK]
dshow debug: CapturePin::Disconnect [OK]
dshow debug: OpenDevice: Removing filters
dshow debug: CaptureFilter::EnumPins
dshow debug: CapturePin::QueryDirection
dshow debug: CapturePin::ConnectedTo [not connected]
dshow debug: CaptureFilter::SetSyncSource
dshow debug: CaptureFilter::JoinFilterGraph
dshow debug: CaptureFilter::GetState 0
dshow debug: CaptureFilter::~CaptureFilter
dshow debug: CapturePin::~CapturePin
dshow error: can't open video device
dshow debug: found device: Digitale Audioschnittstelle (2-
dshow debug: asking for default device: Digitale Audioschnittstelle (2-
dshow debug: asked for Digitale Audioschnittstelle (2-, binding to Digitale Audioschnittstelle (2-
dshow debug: using device: Digitale Audioschnittstelle (2-
dshow debug: EnumDeviceCaps: output pin: Capture
dshow debug: EnumDeviceCaps: input pin: Hauptlautst�rke
dshow debug: EnumDeviceCaps: trying pin Capture
dshow debug: EnumDeviceCaps: input pin default format configured
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:2, samples/sec:44100 bits/sample:16
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:2, samples/sec:44100 bits/sample:16
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:1, samples/sec:44100 bits/sample:16
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:2, samples/sec:32000 bits/sample:16
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:1, samples/sec:32000 bits/sample:16
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:2, samples/sec:22050 bits/sample:16
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:1, samples/sec:22050 bits/sample:16
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:2, samples/sec:11025 bits/sample:16
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:1, samples/sec:11025 bits/sample:16
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:2, samples/sec:8000 bits/sample:16
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:1, samples/sec:8000 bits/sample:16
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:2, samples/sec:44100 bits/sample:8
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:1, samples/sec:44100 bits/sample:8
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:2, samples/sec:22050 bits/sample:8
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:1, samples/sec:22050 bits/sample:8
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:2, samples/sec:11025 bits/sample:8
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:1, samples/sec:11025 bits/sample:8
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:2, samples/sec:8000 bits/sample:8
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:1, samples/sec:8000 bits/sample:8
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:2, samples/sec:48000 bits/sample:16
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:1, samples/sec:48000 bits/sample:16
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:2, samples/sec:96000 bits/sample:16
dshow debug: EnumDeviceCaps: input pin accepts format: araw, channels:1, samples/sec:96000 bits/sample:16
dshow debug: CaptureFilter::JoinFilterGraph
dshow debug: connecting filters
dshow debug: CaptureFilter::EnumPins
dshow debug: CapturePin::QueryDirection
dshow debug: CapturePin::ConnectedTo [not connected]
dshow debug: CapturePin::QueryPinInfo
dshow debug: CaptureFilter::QueryFilterInfo
dshow debug: CapturePin::QueryPinInfo
dshow debug: CaptureFilter::EnumPins
dshow debug: CapturePin::QueryDirection
dshow debug: CapturePin::QueryDirection
dshow debug: CapturePin::QueryAccept [OK] (channels=2, samples/sec=44100, bits/samples=16, format=araw)
dshow debug: CapturePin::ReceiveConnection [OK]
dshow debug: CapturePin::NotifyAllocator
dshow debug: filters connected successfully !
dshow debug: MEDIATYPE_Audio
dshow debug: selected audio pin accepts format: araw
dshow debug: Playing...
dshow debug: CapturePin::QueryPinInfo
dshow debug: CaptureFilter::EnumPins
dshow debug: CapturePin::QueryDirection
dshow debug: CaptureFilter::EnumPins
dshow debug: CapturePin::QueryDirection
dshow debug: CapturePin::QueryPinInfo
dshow debug: CaptureFilter::EnumPins
dshow debug: CapturePin::QueryDirection
dshow debug: CaptureFilter::EnumPins
dshow debug: CapturePin::QueryDirection
dshow debug: CapturePin::ConnectedTo [OK]
dshow debug: CaptureFilter::SetSyncSource
dshow debug: CaptureFilter::Pause
dshow debug: CaptureFilter::Run
main debug: selecting program id=0
main debug: using access_demux module "dshow"
main debug: looking for packetizer module matching "any": 24 candidates
main debug: using packetizer module "copy"
main debug: starting in async mode
main debug: looking for meta reader module matching "any": 2 candidates
lua debug: Trying Lua scripts in C:\Users\Norbert\AppData\Roaming\vlc\lua\meta\reader
lua debug: Trying Lua scripts in D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\meta\reader
lua debug: Trying Lua playlist script D:\GE\Player\vlc-3.0.0-win32\vlc-3.0.0\lua\meta\reader\filename.luac
main debug: no meta reader modules matched
main debug: `dshow://' successfully opened
main debug: switching to sync mode
copy debug: need valid dts
main debug: Buffering 0%
main debug: Buffering 36%
main debug: adding a new sout input for `s16l` (sout_input: 03a32568)
stream_out_transcode debug: not transcoding a stream (fcc=`s16l')
duplicate debug: duplicated a new stream codec=s16l (es=0 group=0)
main debug: adding a new input
mux_ts warning: rejecting stream with unsupported codec s16l
main error: cannot add this stream
duplicate debug: - failed for output 0
main debug: looking for audio decoder module matching "any": 23 candidates
araw debug: samplerate:44100Hz channels:2 bits/sample:16
main debug: using audio decoder module "araw"
duplicate debug: - added for output 1
main debug: Buffering 73%
main debug: Stream buffering done (330 ms in 330 ms)
main debug: Decoder wait done in 0 ms
main debug: creating audio output
main debug: looking for audio output module matching "any": 6 candidates
mmdevice debug: using default device
mmdevice debug: display name changed: VLC media player
mmdevice debug: display name changed: VLC media player
mmdevice debug: display name changed: VLC media player
mmdevice debug: display name changed: VLC media player
mmdevice debug: display name changed: VLC media player
mmdevice debug: version 2 session control unavailable
mmdevice debug: volume from -63.000000 dB to +0.000000 dB with 1.500000 dB increments
main debug: using audio output module "mmdevice"
main debug: looking for aout stream module matching "any": 2 candidates
wasapi debug: buffer size : 88200 frames
wasapi debug: maximum latency: 5805000 ns
wasapi debug: default period : 10158700 ns
wasapi debug: minimum period : 3000000 ns
main debug: using aout stream module "wasapi"
main debug: output 's16l' 44100 Hz Stereo frame=1 samples/4 bytes
main debug: looking for audio volume module matching "any": 2 candidates
main debug: using audio volume module "integer_mixer"
main debug: input 's16l' 44100 Hz Stereo frame=1 samples/4 bytes
main debug: looking for audio filter module matching "scaletempo": 16 candidates
scaletempo debug: format: 44100 rate, 2 nch, 4 bps, fl32
scaletempo debug: params: 30 stride, 0.200 overlap, 14 search
scaletempo debug: 1.000 scale, 1323.000 stride_in, 1323 stride_out, 1059 standing, 264 overlap, 617 search, 2204 queue, fl32 mode
main debug: using audio filter module "scaletempo"
main debug: conversion: 's16l'->'f32l' 44100 Hz->44100 Hz Stereo->Stereo
main debug: looking for audio converter module matching "any": 8 candidates
audio_format debug: s16l->f32l, bits per sample: 16->32
main debug: using audio converter module "audio_format"
main debug: conversion pipeline complete
main debug: conversion: 'f32l'->'s16l' 44100 Hz->44100 Hz Stereo->Stereo
main debug: looking for audio converter module matching "any": 8 candidates
audio_format debug: f32l->s16l, bits per sample: 32->16
main debug: using audio converter module "audio_format"
main debug: conversion pipeline complete
main debug: looking for audio resampler module matching "any": 3 candidates
main debug: using audio resampler module "ugly"
main debug: inserting 2249 zeroes
mmdevice debug: state changed: 1
mmdevice debug: state changed: 1
main warning: playback too late (61670): up-sampling
-- logger module stopped --

[nmi]

Did some further tests. I'm able to just play the capture device with the following code (tested with VLC 3.0.0):

Code: Select all

start vlc.exe dshow:// :dshow-vdev="USB2.0 Grabber" :dshow-aspect-ratio=4\:3 :dshow-size=720x576 :dshow-fps=25.0 :dshow-video-input=1

But as soon as i try anything with ":sout=...." i'm not able to show/transcode anything

nmi

[Jean-Baptiste Kempf]

You should try with a simple sout chain, not a complex one, for a start.

[nmi]

I allready tried this.
The following was tested with vlc 2.0.8 and 3.0.1.
I also tested with other old versions, but with no better results than with 2.0.8 (except for version 1.1.11, there i CAN watch the video, save it compressed to disk (only with ffmpeg) and take snapshots).

1.

Code: Select all

vlc -vvv dshow:// :dshow-vdev="USB2.0 Grabber" --sout=#duplicate{dst=display,dst=file{dst=D:/GE/temp/file01.mp4}}

Delivers a non compressed videofile (much to big for my uses) and also a video on the display, but no snapshot is possible (which is important for me) (Version 2.0.8 and 3.0.1)

2.

Code: Select all

vlc -vvv dshow:// :dshow-vdev="USB2.0 Grabber" --sout=#"transcode{vcodec=h264,vb=2400,scale=1,acodec=none}":duplicate{dst=display,dst=file{dst=D:/GE/temp/file02.mp4}}

Delivers a compressed videofile, but no video on the display with version 2.0.8.
Delivers an empty file with version 3.0.1.

All results are the same if i choose another source of video (e.g. a youtube video file (https://youtu.be/0qHloLgGlio) instead of directShow (dshow:// :dshow-vdev="USB2.0 Grabber")).

If anybody think there could be simpler sout chains for testing my case (look a video, write it to disk compressed simultaneously, take snapshots) or anybody can tell me where is the error in my source code or which version of vlc i should use, i would be very happy.

Greetings,
nmi