[MPlayer-users] latest win32 build - FLV encoding broken?

[Mark Kennedy]

Hi,

I also have the same problem using SVN rev: 23847 and ffmpeg externals 
from rev: 9778.  Encoding seems to work as normal, but neither mplayer 
nor Flash 9 player liked the video stream (audio was fine if present).

I suspected it was a problem with libavformat, and I found (after trial 
and error) that rolling ALL ffmpeg libs to anything before r7593 (which 
had commit log 'add codec_id <-> codec_tag tables to AVIn/OutputFormat') 
and then matching this with an mplayer checkout from the same day (6th 
Jan '07 -> r21847) meant I got a compilable mencoder that could produce 
working FLVs.

I'm not an mplayer/ffmpeg developer so I can't say this was anything but 
a stab in the dark.  It's possible 'codec_id <-> codec_tag tables' is 
completely unrelated to the problem, but I thought this might be useful 
to somebody.

Incidentally, I have now successfully got VP6 encoding with FLVs working 
using the vp6vfw.dll.  To do this I had to get mencoder producing valid 
FLV files using the revisions I mention above, and then doing:

svn up -r HEAD libmpcodecs/*vfw*.c

(i.e. bringing all vfw related files in libmpcodecs up to date)

I could then use 'vfw2menc' from the win32 mencoder install on a windows 
box to make me some .mcf configuration files that I stuffed into 
mencoder thus:

./mencoder input.mov \
     -of lavf \
     -ffourcc FLV1 \
     -ovc vfw \
     -oac mp3lame \
     -xvfwopts codec=vp6vfw.dll:compdata=configfilename.mcf \
     -srate 44100 \
     -lameopts vbr=3:br=96:mode=3 \
     -af lavcresample=44100:16:1 \
     -vf scale=720:-3 \
     -lavfopts i_certify_that_my_video_stream_does_not_use_b_frames \
-o output.flv

The .mcf files are perfectly portable from the windows machine to my 
linux box, hence I can now encode VP6 on a headless server without using 
On2's frankly irritating VP6 SDK \o/.  I tested this using a dll from 
the 'personal edition'.

I am thinking that the binary format used in the .mcf looks fairly 
trivial, so will attempt to write a script to create them on the cmd 
line without having to deal with windows dialog boxes :-)

Hope that helps somebody else.

Mark

Razvan Cosma wrote:
>  Hi all,
> Testing with MPlayer+mencoder Sherpya-SVN-r23404-4.2.0, several mpeg2
> and quicktime mpeg4 sources. Mencoder doesn't show any errors, but
> running mplayer on the resulting file outputs a lot of "unsupported
> codec" errors and only plays the sound.
> On the same system, MPlayer+mencoder dev-SVN-r22220-4.1.1 work fine.
> Command line used:
> D:\\Apps\\MPlayer\\mencoder.exe "%1" -lavfopts i_certify_that_my_video_stre
> am_does_not_use_b_frames -vf scale=320:180 -ffourcc FLV1 -of lavf -ovc
> lavc -oac
>  lavc -lavcopts
> dia=2:precmp=2:cmp=2:subcmp=2:vcodec=flv:vbitrate=256:acodec=mp3
> :abitrate=56 -srate 22050 -o "%1.flv"
> 
> _______________________________________________
> MPlayer-users mailing list
> MPlayer-users at mplayerhq.hu
> http://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
> 
> ______________________________________________________________________
> This email has been scanned by the MessageLabs Email Security System.
> For more information please visit http://www.messagelabs.com/email 
> ______________________________________________________________________