[Avidemux] ***FAQ*** <2008-10-02>

[LoRd_MuldeR]

Originally Posted by Mgz

do those encoders and audio codecs support multi-thread?

Multi-threading support is not a question of Avidemux, it depends totally on the individual encoder! For example "x264" has awesome multi-threading support (100% load on all four cores of a Quadcore). At the same time the multi-threading support in "Xvid" is very limited (compared to x264). About the ffmpeg/libavcodec encoders: I'm not sure, but at least the MPEG-2 encoders seems to use two cores...

Note: In Avidemux you can configure the number of threads separately for each encoder.

[cheshire2k]

any idea on putting a dvd thru this ?

[LoRd_MuldeR]

Originally Posted by cheshire2k

any idea on putting a dvd thru this ?

Please express your question in a way it can be answered

Avidemux can read VOB files (as found on DVD's) as well as create compliant MPEG-2 files (for burning onto DVD).
But Avidemux is neither a DVD ripping software nor a DVD authoring/burning software...

What exactly do you want to do?


[EDIT]

Maybe those guides can help you to get a start:
* http://www.avidemux.org/admForum/viewtopic.php?id=3469
* http://www.avidemux.org/admForum/viewtopic.php?id=3570


[EDIT²]

Avidemux cannot read ISO files, nor can it read the video directly from DVD discs!
You need to use a ripping software (DVDFab Decrypter, DVD Decrypter, AnyDVD, etc.) to get the VOB files on your Hard Drive.
Then simply open the first VOB of the main movie (e.g. VTS_01_1.VOB) in Avidemux via "File" -> "Open".
If Avidemux asks for appending several files, then say "Yes". If it asks for indexing the MPEG file, say "Yes" again...

[cheshire2k]

sorry my bad It kept coming up with permission denied on reading the iso mounted to a virtual drive so I riped the dvd to a folder instead and works but takessssssssss FOREVER lastnite I set it running at 10pm 2 pass 1381 bitrate no audio max refs 3 with 3 filters and its still going now today at 2.56pm any reason why its taking forever ?.

[foxyshadis]

Your computer's too slow?

[cheshire2k]

:P i dont know why but on fairuse on full settings or using the same commands in the codec settings it only takes 8 hours to convert maybe 10 but ony this its taking forver

[LoRd_MuldeR]

I can assure you, that Avidemux isn't noticeable slower (or faster) than other video editors.
The bottleneck will be the encoder anyway (well, unless you use really heavy filters).
And since Avidemux is using x264 for H.264 encoding, there won't be any difference to other applications using x264.
The same applies to Xvid for MPEG-4 ASP encoding.

So there are basically two possible reasons why encoding speed is significant slower:
You either use different encoder settings (even if you didn't notice) or you use different filters...

[cheshire2k]

Is it me or is go faster when you select priority to below normal ?

[LoRd_MuldeR]

Originally Posted by cheshire2k

Is it me or is go faster when you select priority to below normal ?

You still have fun posting in the Sticky/FAQ thread, eh?


To answer your question:

It doesn't make any sens to get "faster" encoding speed by lowering the process priority of the encoding application!
Lowering the priority of other applications could indeed speed-up the encoding - in certain cases. But I guess that's not what you meant, right?


For information:

Process priorities only take effect when there are several processes running at the same time (processes with high CPU time consumption).
And of course only if there are more processes/threads running than CPU Cores. Otherwise each process/thread can happily run on it's own core.
So as long as your are running Avidemux only and don't do other CPU intensive tasks concurrently, the effect of priorities will be near zero

I personally prefer "below normal" priority for Avidemux, so I can do other things (listen to music, surf the internet, and so on) while I'm encoding.
Those lightweight tasks won't "steal" too much CPU time from Avidemux, so encoding speed won't be effected in a noticeable way...

[freedom4651]

How can i add ASS subtitle in Avidemux without getting error ?
my subtitle file contain multiple style and japanese chracter. This file is fine when played using DirectVobSub, but when i try to make it hardsubbed using Avidemux, it always says "Cannot read_file for *D:\project\Natsuyaki Miyabi - Natsu Remember You.ass*"

Log file included

[LoRd_MuldeR]

@freedom4651
If you find a bug, you can file a bug report at http://bugs.avidemux.org/
You should also provide a sample file to reproduce the problem...

BTW: Instead of attaching your log, which requires approval, better use [CODE] tags in your post

[LigH]

Feature request:

If Avidemux imports a Matroska file with native MPEG4-ASP video (e.g. built with MeGUI using xvid-encraw), it assumes FourCC = DIVX on exporting it to AVI. That may be "risky" when MPEG4-ASP features were set up in xvid-encraw which are beyond the abilities of DivX.

I'd like to see an option (e.g. in the "Input" settings) where I can chose a FourCC being assumed for "V_MPEG4/ISO/ASP" MKV imports (DIVX, DX50, XVID, maybe MP4V/LMP4/FMP4?). Possibly one for MPEG4-AVC too (although saving AVC AVIs may not be encouraged...).
__

P.S.: Would it even be detectable if DivX may not be able to decode some ASP video stream, and XviD (ffdshow) may be required?

[LoRd_MuldeR]

Originally Posted by LigH

If Avidemux imports a Matroska file with native MPEG4-ASP video (e.g. built with MeGUI using xvid-encraw), it assumes FourCC = DIVX on exporting it to AVI. That may be "risky" when MPEG4-ASP features were set up in xvid-encraw which are beyond the abilities of DivX.

AFAIK Avidemux uses "DIVX" as default FourCC for MPEG-4 ASP in AVI in order to ensure Standalone player compatibility (some won't accept other FourCC codes).

Originally Posted by LigH

I'd like to see an option (e.g. in the "Input" settings) where I can chose a FourCC being assumed for "V_MPEG4/ISO/ASP" MKV imports (DIVX, DX50, XVID, maybe MP4V/LMP4/FMP4?). Possibly one for MPEG4-AVC too (although saving AVC AVIs may not be encouraged...).
__

P.S.: Would it even be detectable if DivX may not be able to decode some ASP video stream, and XviD (ffdshow) may be required?

I think you have a much better chance to get that implemented by posting in the Avidemux forum:
http://www.avidemux.org/admForum/

But I think the developers are working on Avidemux 2.5 right now, so they might not be willing to add new features at the moment...

[fatinmidage]

a powerful tool,great~

[prettylove99]

it is a awesome video edited application
would u plz tell me how to add filters to Avidemux
many thanks in advance
best regards

[LoRd_MuldeR]

Originally Posted by prettylove99

it is a awesome video edited application
would u plz tell me how to add filters to Avidemux
many thanks in advance
best regards

Avidemux uses "built-in" filters, so all the filters you see in the pre-compiled builds cannot be changed.
So you would have to edit the source code (implement the new filter) and re-compile Avidemux.

However Avidemux now supports Filter-Plugins, so new video filters can be added via plugins easily.
This way re-compiling Avidemux is not needed to add a filter. All you need is the Plugin DLL...

Another option: Use Avisynth input (AVSProxy GUI) and be able to use all Avisynth filters

[prettylove99]

thanks for your feedback

[prettylove99]

sorry to bother u again
i am a beginner here
the question is that when i try to use the avsproxy gui to open a avisynth script( F:\MTV\1.AVS) it failed
the message is as below:
AVIsynth has encountered a problem ,please see the logo for detailed information!
this may be caused by a missing plugin,an invalid setting ,an imporper script or an unsupported input file.

AvsSocket Proxy, derivated from avs2yuv by Loren Merritt
Loading Avisynth.dll
Avisynth.dll loaded
Env created
Importing..

Avisynth error:
DirectShowSource: RenderFile, the filter graph manager won't talk to me
(C:\DOCUME~1\PRETTY~1\LOCALS~1\Temp\dshow_82262283.avs, line 1)
Initializing WinSock
WinSock ok
Socket bound to port 9999
Waiting for client to connect...

> Exit Code: 1

[LoRd_MuldeR]

"DirectShowSource: RenderFile, the filter graph manager won't talk to me"

You try to use DirectShowSource() but no suitable DirectShow filter for your source video is installed on your system!
Either install the suitable DirectShow decoders/encoders or try FFmpegSource as an alternative...

[prettylove99]

many thanks for your reply
but i can open this script(F:\MTV\1.AVS) by Virtualdub directly