FFMPEG: Some encoding tips
 

This is what I'm currently testing, and it seems it's working correctly. It also plays in ALL my standalone players.
I encode like this:

Then for the second pass, change the -pass 1 to -pass 2

After you have encoded your file, demux with TMPEG, and remux with BBMpeg as MPEG-1. Not as VCD :!:
Like this:

http://www.digitalfaq.com/archives/error.gif

This way, you get zero mux errors.
So far, I've encoded several ~10 minute clips, and they all play fine. Other than a slight "greenish" color on the picture, everything else seems correct.
Tested on Macintosh and Windows.
Same results on both platforms.

-kwag

And how about a mpeg-2 multiplex???

My Philips can play all the resolutions but for resolution up to 352x288 they have to be multiplexed as SVCD (not VCD). I still encode in mpeg-1 not mpeg-2

Just tried it. Had to mux as MPEG-2. Not as SVCD. At least in WMP, it plays correctly when muxed as MPEG-2.

-kwag

hmmm... funnny:

ffmpeg -i '/windows/H/rip/119/VTS_01_1.VOB' -s 352x288 -b 795 -minrate 300 -maxrate 2500 -g 18 -bf 1 '/windows/E/11sept.mpg' -an
Input #0, mpeg, from '/windows/H/rip/119/VTS_01_1.VOB':
Duration: 00:50:42.2, bitrate: 13827 kb/s
Stream #0.0: Video: mpeg2video, 720x576, 25.00 fps, 8300 kb/s
Stream #0.1: Audio: 0x0000
Stream #0.2: Audio: 0x0000
Stream #0.3: Audio: 0x0000
Stream #0.4: Audio: 0x0000
Stream #0.5: Audio: 0x0000
Output #0, mpeg, to '/windows/E/11sept.mpg':
Stream #0.0: Video: mpeg1video, 352x288, 25.00 fps, q=2-31, 795 kb/s
Stream #0.1: Audio: mp2, 64 kb/s
Stream mapping:
Stream #0.0 -> #0.0
Stream #0.5 -> #0.1
Error while opening codec for stream #0.1 - maybe incorrect parameters such as bit_rate, rate, width or height






OR:



ffmpeg -i '/windows/H/rip/119/VTS_01_1.VOB' -an -s 352x288 -b 795 -minrate 300 -maxrate 2500 -g 18 -bf 1 '/windows/E/11sept.mpg'
Input #0, mpeg, from '/windows/H/rip/119/VTS_01_1.VOB':
Duration: 00:50:42.2, bitrate: 13827 kb/s
Stream #0.0: Video: mpeg2video, 720x576, 25.00 fps, 8300 kb/s
Stream #0.1: Audio: 0x0000
Stream #0.2: Audio: 0x0000
Stream #0.3: Audio: 0x0000
Stream #0.4: Audio: 0x0000
Stream #0.5: Audio: 0x0000
File '/windows/E/11sept.mpg' already exists. Overwrite ? [y/N] y
Output #0, mpeg, to '/windows/E/11sept.mpg':
Stream #0.0: Video: mpeg1video, 352x288, 25.00 fps, q=2-31, 795 kb/s
Stream mapping:
Stream #0.0 -> #0.0
Gleitkomma-Ausnahme

I have that also, it's important to have the parameters in a certain order. Here, the "-an" must be before the name of the output to be taken in account.

Same if you do "-s 352x288 -i nameofthesource" the output won't be in 352x288 but in the source res :!:

the 2nd time i did:
"ffmpeg -i '/windows/H/rip/119/VTS_01_1.VOB' -an"... 8O

And it didn't work ?
You reported the error only in the first case, so I thought everything was correct with the second one.

the 2nd one was : "Gleitkomma-Ausnahme"
--> something to do with an floatcomma ... (dont really know how to translate this...)

-s MUST be after -i
Everything before -i is assumed as input.
[options] -i [options] output

-kwag

ok... i got it... I didn't compile with ac3 support... now it works...

btw:

no -hq in your commandline???

funny... after muxing as MPEG2 he gives me a much too big size in nero!

maybe because of the "Pack options" value 2048?

I think I'll try muxing as an svcd...

EDIT:
2 audio streams + muxed as svcd and workes like a charm :-D (mux rate = 0)

Hello:

I just finished encoding vob 1 of Sleeping Beauty, with the following results:

1.- The audio resulted in Spanish. Is there a way to choose the audio languaje? Can it handle 2 languajes?
2.- When I tried to run -pass 2, which is the only thing I changed on the script, it gave me the following error message:
Am doing something wrong?
3.- I see pixelation in scenes where there is no movement: blue sky, clouds, etc.
4.- It took about 20 minutes to encode 1.048 Gigas, and I just lost the file while trying to run -pass 2. As I mentioned earlier, the only thing I changed was the following: "-pass 1" for "-pass 2" and somehow the first mpg file is now reading 0 Gb. Perhaps I did something wrong......

Thanks for your help.

Totonho03

Hi Otto,

I've experienced the same thing here. The only way around it, has been to edit the .log file that ffmpeg produces, by deleting lines at the end of the log file and saving the log again. I can't see any errors on the log, but after I delete 4 or 5 lines (from the end), then I can start my encode again with the "-pass 2" and it continues without errors.


-kwag

He once gave me a "Error while opening codec for stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height"...try compiling with ac3 support:
http://www.kvcd.net/forum/viewtopic.php?t=6208


select language:
http://www.kvcd.net/forum/viewtopic.php?t=6209

:D :D

only 18 threads so far... 2 of em marked with a [FAQ] in the topic... :wink:
and 1 with a [QUESTION] about 2 audio streams :D :lol:

How about a -bf 2 and a -g 25 (for PAL) ???
Works fine for me with the newest CVS of ffmpeg...
:D
this would be closer to the original kvcd