VirtualDub2

[v0lt]

Originally Posted by LigH

I just tried to convert a clip encoded with AV1 and Opus. File Information displays the details. But the audio stream appears to be silent.

Yes. There is a problem with Opus audio decoding.

[blob2500]

Originally Posted by v0lt

VirtualDub2 x64 with updated avlib-1.vdplugin

Thanks for this upgrade.

But with this version I get this issue (using caching input driver): mpeg-2 in .mkv doesn't seek; it doesn't see I/K-frames (shift + right/left arrow goes to last/first frame only).

No problem with last official Virtualdub2 (2020) and no problem with h.264/MKV.

[LigH]

I found another issue with your test build:

On the occasion of the death of the most thanked Flat Earther, Bob Knodel, I downloaded a video from YouTube using yt-dlp, to cut out the "15 degrees per hour drift" meme. But the selected start and end positions of the opened clip were not reliable, neither while exporting it to a separate MP4 file, nor while navigating and playing it in the timeline editor. The audio was async, and the start moved randomly.

[v0lt]

VirtualDub2_x64_ffmpeg6.0_test6.7z
I seem to have fixed the problem with OPUS decoding.
It's not clear to me how to solve other problems, the code is very confusing.

[isidroco]

Originally Posted by jpsdr

Yes i have. I can put the file on an ftp server and PM you IP & log information if you want.

Any chance for me to have x64 of DShowInputDriver.vdplugin?
Not needed now, but want to do some comparisons with Caching Input driver. Thanks!

[isidroco]

Originally Posted by poisondeathray

Your screenshot for x265vfw shows DAR width, height, not SAR . Try 16 and 9 .
If the the extra commandline box works, you can enter --sar x:y there instead

Just tested, DAR setting is ignored in x265vfw, but ntsc: "--sar 10:11" or for PAL: "--sar 59:54" will generate 4:3 hevc video.
For 16:9 ntsc/pal use: --sar 40:33 / --sar 16:11

[v0lt]

Originally Posted by isidroco

Any chance for me to have x64 of DShowInputDriver.vdplugin?

http://www.virtualdub.org/beta/DShow...river-0.93.zip

[nji]

I need to make a capture of a coming broadcasted video
and so tried this function of VD2 for the first time.
Doing so I encountered problems, maybe someone can help?

At the beginning the audio is about 1s to early.
In between the audio sounds "strangely wrong"/ swaying.
At the end (abt. 2 min) the audio is much to quick,
the voices sound like Donald Duck, still the audio
sync seems to lessen/ vanish (in opposite to what the
statistic pane says).

I enclose the statistic pan at the end of the video.
(At the beginning it shows a sync error of abt 10ms).

I used lagarith for video compr., and PCM for audio.

My settings (when different from default):
Video - Source:
Panning area = top level client area, Acc. mode = GDI
Video - Set Custom Format = 1280 x 768
Audio - Default Output Loopback (Core Audio)
Capture - Capture Settings: Framerate = 50
(Strange: The statistic pane says 27.3 fps, and the
captured movie is abt. 50 fps; checked framewise: a dupe abt. every 10th)
Capture - Timing: Automatical disable ... (no matter how it's set).

What might be going on here?

[isidroco]

Originally Posted by v0lt

http://www.virtualdub.org/beta/DShow...river-0.93.zip

Thanks!

Originally Posted by nji

Screen Capture: Strange audio desync

Hi nji. Which is the capture card you are using?
Please try these Capture Timing Options:
[x] Drop frames..; [x] Insert null...; Null limit: 10; [x] Sync audio to video...; [x] Correct video timing...; [x] Automatic; Number of audio blocks:30; [x] Force audio clock...

Also try first using Capture Settings: Frame Rate=25 (you may try 50fps later after succeeding with 25).

On Lagarith: Mode YV12; [x] Use Multithreading. Uncheck the rest (Null frames may cause desynch on some programs). YV12 is smaller.

[nji]

@isidroco:
Thank you.

Capture card: For screen capture there is no need for a capture card - I don't have any.

Settings: Timing: The settings you suggest are the default ones. With the exception of "Automatic".
That's what I tried - without success.

But meanwhile I tried disabling Resync mode, "Correct" and "Automatic". ==> Audio in sync from start to end!!
So there seems to be a kind of bug (?) in VD2?

Moreover there remains the question about fps (see my first post above).

[nji]

Up to now I mostly used mp4 container for (AVC1, AAC) to have good compatibility.
(Good choice?).
Recently I noticed that AAC in VD2 offers only CBR mode, while most prof movies use VBR mode.
So my (second) question:
Should I use VBR, and how to do that?
(I suspect I need an external codec for it?)

[StainlessS]

No idea if relevant but,
There were always problems in VDub with mp3 VBR,
perhaps problems with *any* VBR is an AVI issue. [EDIT: Or VDub issue]

[isidroco]

Originally Posted by nji

...
(Strange: The statistic pane says 27.3 fps, and the
captured movie is abt. 50 fps; ...

I think the key is there, VDub thinks video is 50fps, but it's being captured at 27.3. I just made a test (with defaults settings as shown before), and with 50fps statistics was also 50 A/V was on synch. Maybe your system has a bottleneck that prevents you to reach that fps. Please use VirtualDub64 which is a lot faster. And try slower FPS first.

[isidroco]

Originally Posted by nji

Should I use VBR, and how to do that?
(I suspect I need an external codec for it?)

Learnt the hard way: Never use VBR audio with VDub.

[nji]

Thank you for your hints!

[LigH]

Today I wanted to open an old AVI file with 16 kHz stereo MP3 audio through AviSynth+. VirtualDub2 build 44282 does it. VirtualDub2_x64_ffmpeg6.0_test6 instead:

---------------------------
File open error
---------------------------
FFMPEG: Unsupported channel layout.
---------------------------
OK
---------------------------

I also tried to export it as WAV, 16 bit stereo, 44100 Hz, loading it separately via LwLibavAudioSource and multiplexing it using AudioDub: same issue.

[SeeMoreDigital]

Originally Posted by LigH

I also tried to export it as WAV, 16 bit stereo, 44100 Hz, loading it separately via LwLibavAudioSource and multiplexing it using AudioDub: same issue.

Have you tried using good old fashioned AVIMux GUI?

[LigH]

Ehm, I passed the material through AviSynth+, that failed. Both with audio out of an AVI file and with separate audio from WAVSource().AudioDub().

[isidroco]

Originally Posted by LigH

Ehm, I passed the material through AviSynth+, that failed. Both with audio out of an AVI file and with separate audio from WAVSource().AudioDub().

Try opening the video with VDub2, and File, Save Audio to a WAV file. Try that .WAV in AviSynth.

[LigH]

I tested a little more and discovered:

The basic builds of VirtualDub2 (both 32 and 64 bit) usually offer the "Caching input driver" when opening an AVI file but immediately switch to the internal "AVIFile/AviSynth input driver" when I select an AVS file.

The test6 build of VirtualDub2 also offers the "Caching input driver" when opening an AVI file; but when I select an AVS file in the directory listing of the File - Open dialog, it utilises my harddisk heavily for a dozen of seconds, then does not automatically switch to "AVIFile/AviSynth input driver". When I try to open the AviSynth script file with the "Caching input driver", it fails complaining "FFMPEG: Unsupported channel layout."; but when I manually switch to the "AVIFile/AviSynth input driver", the script opens.