XviD Second Pass With FFMPEG

[BTJustice]

EDIT: IT WORKS!!! Please read... http://forums.gbpvr.com/showpost.php?p=3...stcount=35

I am trying to figure out how to have ffmpeg do a second pass when encoding a .mpg to a .avi but every time it leaves the .mpg and creates the .avi but it has no size. Here is my code in config.xml ...

Code:

<Conversion name="XviD" cmd="-y -i {SOURCE_FILE} -f avi -ab 224k -ac 2 -acodec mp3 -vcodec xvid -deinterlace -pass 2 -qscale 7 -vtag XVID {DEST_FILE}" targetExtension=".avi" />

[Reddwarf]

To use the "-pass 2" parameter to ffmpeg you need to run it first with the "pass 1" parameter, that creates a passlogfile with statistics that is used during the second pass. But it is not possible to have the built-in conversion do a two-pass conversion, for that you need to replace the ffmpeg-command with the name of a .bat-file that does the actual conversion. Search the forums for "ffmpeg", there are some hints and clues in some threads here.

[BTJustice]

Searching for -pass didn't yield any results.

I did some digging and found this code for a .BAT file...

Code:

Title %~n1 -- pass 1
"C:\Program Files\Devnz\GBPVR\Third Party\ffmpeg\ffmpeg.exe" -i %1 -vcodec xvid -bf 1 -an -deinterlace -qscale 7 -pass 1 -y nul.avi
Title %~n1 -- pass 2
"C:\Program Files\Devnz\GBPVR\Third Party\ffmpeg\ffmpeg.exe" -i %1 -vcodec xvid -acodec mp3 -ab 224k -bf 1 -pass 2 "%~dp1%~n1.avi"
pause

I am not sure if that would work or how to enter the syntax to use it in config.xml

[Reddwarf]

First of all: What's your goal, are you looking for a good quality encoded file, a small file or a quick conversion? You can't have them all, it will always be a compromise, so why do you want to do a two-pass conversion?

With h264 codec however, it is possible to have a relativly small file with good quality, but it takes time. Let me hear what you want.

[BTJustice]

I want a sharp picture and a small file. My XviD .avi files are good on size using qscale 7, but they have blocks in them especially in action sequences and in areas where the video is black. I figured a second pass would clean them up a bit more.

Maybe the blockiness comes from watching videos in full screen. My resolution for them is 720 x 480 whereas I use 1440 x 900 on my desktop.

Of course if there is a better codec out there to encode with that would give me small size and a decent picture then I am all for it.

[Reddwarf]

The best result I'v got so far is with the H264 codec, here's the command line I use in the postprocessing .bat:

"C:\Programfiler\devnz\gbpvr\Third Party\FFmpeg\ffmpeg.exe" -i "%1" -threads 2 -s 768x576 -crf 22 -vcodec h264 -flags +loop -cmp +chroma -partitions +parti8x8+parti4x4+partp8x8+partp4x4+partb8x8 -me umh -subq 7 -trellis 1 -refs 6 -bf 16 -directpred 3 -b_strategy 1 -bidir_refine 1 -coder 1 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -bt 142282 -rc_eq "blurCplx^(1-qComp)" -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -acodec mp3 -ar 44100 -ab 128k -y "%2"

You could modify it to fit the syntax in config.xml, h264 encoding however is a heavy task. See thread http://forums.nextpvr.com/showthread.php?t=40978

Good luck!

[BTJustice]

Would this simple code work?

Code:

<Conversion name="H.264" cmd="-y -i {SOURCE_FILE} -f mp4 -ab 256k -ac 2 -acodec mp3 -ar 44100 -crf 22 -deinterlace -threads 2 -vcodec h264 -vtag H264 {DEST_FILE}" targetExtension=".mp4" />

[Reddwarf]

Why not give it a try and see for yourself? (remember to back-up the original file first).

[BTJustice]

It doesn't work.

[BTJustice]

On a side note, I thought this was pretty impressive...

http://flowplayer.org/forum/7/12671

I made a new thread about H.264...

http://forums.nextpvr.com/showthread.php?p=326671