VirtualDub2

[LigH]

Oops, my fault, I only thought about the ffmpeg command line interface...

MeGUI uses the x265.exe command line encoder; this is neither a VfW codec nor a library module (as used in VirtualDub2's separate "FFMPEG / x265" encoder).

You might use the x265 CLI encoder via the "External encoder" setup in VirtualDub2. But this has no pretty user interface.

[poisondeathray]

Originally Posted by SeeMoreDigital

I installed x265vfw v3.40 which like libx264 core 157 video encoder does offer a method of entering 'Sample Aspect Ratio' values. But sadly the entered values don't appear to make it into the video stream



By contrast, the x265 video encoder in MeGUI is able to produce encodes with aspect ratio signalling within the video stream. But I don't know when/where this SAR information is added

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

[SeeMoreDigital]

Originally Posted by poisondeathray

Your screenshot for x265vfw shows DAR width, height, not SAR . Try 16 and 9 .

After entering '16' in the 'DAR width' box and '9' in the 'DAR height' box, I can confirm that no aspect ratio signalling makes its way into the video stream...

[LigH]

Does it work differently if you use a side channel "Output file" in x265vfw, instead of passing it through VirtualDub2?

[takla]

Is there any way to get 10bit to the dropdown menu under external encoder settings? I can only pick between yuv 8bit, 16bit and various rgb pixel formats.

[SeeMoreDigital]

Originally Posted by LigH

Does it work differently if you use a side channel "Output file" in x265vfw, instead of passing it through VirtualDub2?

Sadly your suggestion does not work either

[shekh]

Originally Posted by takla

Is there any way to get 10bit to the dropdown menu under external encoder settings? I can only pick between yuv 8bit, 16bit and various rgb pixel formats.

Such option is not implemented, but I assume it is safe to roundtrip 10-bit content in 16-bit. Are you afraid of rounding error?

[takla]

Originally Posted by shekh

Such option is not implemented, but I assume it is safe to roundtrip 10-bit content in 16-bit. Are you afraid of rounding error?

I wanted to encode in 10bit (lossy) for better precision from the encoder. I'd like to do this with vdub2 since it is nice for cutting the video frame accurately. I'd then send the stream to ffmpeg.

Not sure what you mean with "roundtrip 10-bit content in 16-bit". But when I select 16bit, and set 10bit as an ffmpeg command, I get the following 2 errors:

with -pix_fmt yuv420p10le and 4:2:0 8bit yuv
https://i.imgur.com/8p3rCq1.png

with -pix_fmt yuv420p10le and 4:2:0 16bit yuv
https://i.imgur.com/ZZlw6pE.png

[shekh]

Originally Posted by takla

I wanted to encode in 10bit (lossy) for better precision from the encoder. I'd like to do this with vdub2 since it is nice for cutting the video frame accurately. I'd then send the stream to ffmpeg.

Not sure what you mean with "roundtrip 10-bit content in 16-bit". But when I select 16bit, and set 10bit as an ffmpeg command, I get the following 2 errors:

with -pix_fmt yuv420p10le and 4:2:0 8bit yuv
https://i.imgur.com/8p3rCq1.png

with -pix_fmt yuv420p10le and 4:2:0 16bit yuv
https://i.imgur.com/ZZlw6pE.png

the ffmpeg command line must include pix_fmt twice: one for raw input and another for your desired output

like this:

-f rawvideo -pix_fmt %(pix_fmt) -s %(width)x%(height) -r %(fpsnum)/%(fpsden) -i - -c:v libx264 -pix_fmt yuv420p10le %(tempvideofile)

%(pix_fmt) macro always matches the format selected in dropdown in ffmpeg syntax.

[takla]

Originally Posted by shekh

-

Ohh I see. Thanks. It's working now.

[GAP]

I have two questions:

1. What is the difference the x264 8 bit and x264 10 bit codecs respectively? And is it similar to x264vfw codec?
2. Can anyone explain what those FFMPEG encoders are?

[LigH]

1. x264 8 bit encodes video in the MPEG-4 AVC Main/High Profile with internal quantized components of 8 bit resolution; x264 10 bit encodes video in the MPEG-4 AVC High 10 Profile with internal quantized components of 10 bit resolution. The latter is specifically known to be useful for cartoon video content. — NOTE: Not every player is capable of playing High 10 Profile AVC video.

2. They are not VfW codecs, but provided by a separate collection of encoders based on ffmpeg's libavcodec library, so they are independent of any codecs installed into your Windows system. Similar to the decoders in VLC. VDub2 contains ffmpeg based decoders, too

[LigH]

I got a report that VirtualDub2 doesn't handle audio conversions when processing a clip with 24 bit PCM audio. Using FFmpeg Lame MP3 produces loud static noise (I can confirm). FFmpeg AAC "crashes" (in my case the dub process gets stuck after 650 audio samples, then "Integer division by zero" crash).

When I try to convert the audio to 16 bit internally in VirtualDub2 before compression, it fails with an error message in the Audio group of the "Save video" dialog, Sample Layout: [Cannot convert audio: the source audio form{...}].

[LigH]

Any idea about the reason, shekh? 24 bit integer not supported in the audio pipeline?

And again, the ffmpeg library ages on and on...

[richardpl]

What ages on and on?

[LigH]

VirtualDub2 still uses an ffmpeg plugin version with an older API because adapting VirtualDub2 to the requirements of the most recent ffmpeg API version seems to be a heavy challenge for shekh...

[shekh]

Originally Posted by LigH

Any idea about the reason, shekh? 24 bit integer not supported in the audio pipeline?

And again, the ffmpeg library ages on and on...

Sorry for late reply, do you still have the sample? I tried it and it works for me (converted test file to pcm_s24le with ffmpeg).
Anyway, VD2 can internally work with u8, s16le, f32le. Other formats get converted by the input driver.

[Emulgator]

x264 with CRF <17 might be what you're searching for.

[LigH]

@shekh: 24 bit example. AviSynth script just as dummy video track. Important part is the WAV file to be used as external audio track (Audio - Audio from other file...), in Audio "Full processing mode" and with a Compressor. Archive contains an MKV with Ut Video and PCM audio track, and to compare, another with MP3 audio track compressed via the FFmpeg Lame MP3 encoder. The result with AAC is broken, did not add this.

Audio driver is an "NVIDIA High Definition Audio" device, general Windows 10 64b.

[GAP]

How do you convert AVISynth scripts to Virtualdub processing scripts?