Daily FFMPEG BUILDS

[Amnon82]

Here is the newest FFMPEG Build:

CVS 12.04.04 MinGW - AC3 Encoding/Decoding enabled

Have Fun

P.S.

It supports padding now.
So You can add borders on each side of the frame.

[katjarella]

DANKE !!!

[tickey]

Originally posted by Amnon82
Here is the newest FFMPEG Build:

CVS 31.03.04 MinGW - AC3 Encoding enabled

Have Fun

I think AC3 encoding was always enabled. AC3 DECODING wasn't until you did yesterday.
Is that what you mean or am I wrong?
PS, I have not had time to look for the command line for proper 5.1 decoding, will try and do it 2day.

[celtic_druid]

Option is --enable-a52 (enable GPL'ed A52 support [default=no]) so I would assume that it is for both decoding and encoding, unlike aac where you have faad and faac.

[tickey]

Originally posted by celtic_druid
Option is --enable-a52 (enable GPL'ed A52 support [default=no]) so I would assume that it is for both decoding and encoding, unlike aac where you have faad and faac.

The subject came up here: http://forum.doom9.org/showthread.ph...0&pagenumber=1


From: http://ffmpeg.sourceforge.net/faq.html

1.7 Why Audio is not decoded in VOB files ?
AC3 decoding is optional as the codec is currently released under the GPL. Enable it with ./configure --enable-a52. Take care: by enabling AC3, you automatically change the license of libavcodec from LGPL to GPL

Apparently AC3 decoding is not automatically enablabled.
Try it in ffmpeggui you will see it will not read ac3 or avi w/ac3 audio.

Avalon enabled it in his build @ the above link.
It works great on AC3 2 channel and very fast(4xbesweet)but the gui was not written to handle this function so it mishandles ac3 5.1 and the result is not acceptable in that case.
So we are looking for the proper command for ac3 5.1 channel decoding and then Avalon said he will make the gui 4 it.
I just haven't had the time to go looking 4 it and testing out the options, maybe later 2day.

[Mug Funky]

nice. i appreciate you compiling and hosting these binaries...

one question about the ac3 thing... is ffmpeg able to be piped to through stdin? i'd LOVE to be able to encode ac3 through foobar2000's CLI option.

[Amnon82]

nice to see that people like the small things I can do.

@tickey: It was 04:00 AM as I compiled the Build of today. Encoding/decoding ... It was to early to get a clear mind...
Next update maybe tomorrow morning...

[Amnon82]

New version online. Anyway, did somebody here a SVCD encode?
For example I've a 16:9 Source and want a SVCD in the right aspect ratio. I managed to get the rigth resolution with cropping:

464x430 but I didn't get managed to add borders to get a valid 480x576 resolution.

It will be nice to find out how to do proper resizing in ffmpeg. Or isn't there a way encoding 4:3 SVCD out of 16:9 without Eggheads?

[Mozart]

addborders is called by people in the linux world as "padding". There is a post at ffmpeg-devel-maillist from somebody who created a patch for ffmpeg so that it could be able to "pad" a video encoding.

[Amnon82]

K, Mozart my friend. Can You link me the patch? I'll try to build it into the windows version. Then we all have this feature also in windows.
If You can link also the source of the patch.

[Amnon82]

Today I'm trying something new. this is the line I used for compiling ffmpeg:

./configure --enable-a52 --enable-pp

So preprocessing is now also activated.

[Mozart]

have a look at here.

It is possible to get a lot of information from mailist. The only problem is that it is a huge mess... For example: if you want to get a .mpv output, use -f mpeg1video -vcodec mpeg2video video.mpv

[edit]sourceforge mail list goes down from time to time. If you cannot connect at this moment, try again latter.[/edit]

[Amnon82]

Mozart the problem is how to use a maillist. (maybe stupied...). I mailed to one and now I got emails about this thema. I think thats the way it goes or not. It is not a forum like here where somebody post a question and somebody else answers it. I'll take a look on the link you given me.

[LigH]

I don't know about this specific one, but from those I know, you'll probably have to write your mail not to one member, but to a specific mailing list address, to have all members at once informed.

But I don't remember the name of that famous, so often used, mailing-list daemon - how was it called...

[Amnon82]

I see. This is also what I found out. This system is creasy, but if it works...

[tickey]

Some results re ffmpeg ac3 decoding/encoding.
AC3 2.0 channel@X_bitrate to AC3 2.0 channel@X_bitrate-pass
AC3 5.1 channel@X_bitrate to AC3 5.1 channel@X_bitrate-pass
AC3 2.0 channel@X_bitrate to mp2 2 channel@X_bitrate-pass
AC3 5.1 channel@X_bitrate to mp2 2 channel@X_bitrate-fail: appends 3x2 channels end to end
mp3/avi 2 channel@X_bitrate to AC3 2.0 channel@X_bitrate-pass
mp3/avi 2 channel@X_bitrate to mp2 2 channel@X_bitrate-pass

I couldn't sort out the ac3 5.1 channel to mp2 (for svcd/vcd people).
If someone has the command line for this that works, please post.
Myself I use the AC3 5.1 channel@X_bitrate to AC3 5.1 channel@X_bitrate for reducing the size of my ac3 for my KDVDs(3 short/2 long movies/dvd).

Just as a short comparison I tested AC3 5.1 channel@X_bitrate to AC3 5.1 channel@X_bitrate on the new BeSweet on a short/fixed 10 min ac3 file-just reintroduced today.
BeSweet:82 secs
FFMpeg:approx. 60 secs

Special thanks to Avalon for enabling this great feature in ffmpeg.
Sample cli

path\ffmpeg.exe -ab 256 -ar 48000 -ac 6 -acodec ac3 -i path\input.ac3 path\output.ac3

Transodes an ac3 5.1 to ac3 5.1
It is also being discussed here.
http://forum.doom9.org/showthread.ph...0&pagenumber=2
I will also post this in the audio section, as that's were it belongs but I wanted to wrap up loose ends in this tread.

[Amnon82]

tickey you're a realy thankfull man...

[lithoc]

Does it has volume level for each channel? For FR,FL,Center,SR,SL and Subwoofer? I find BeSweet have this feature.

[Amnon82]

I didn't test this ac3encode feature. I don't think so...

[tickey]

Originally posted by lithoc
Does it has volume level for each channel? For FR,FL,Center,SR,SL and Subwoofer? I find BeSweet have this feature.

Not that I know of. If you need those features use besweet.
Adjusting those settings do not always yeild a good result.
Myself, I don't adjust those settings so i use ffmpeg.