[MEncoder-users] Compatibility broken with my hardware player since 1.0pre7, DIVX vs FMP4 tag

[Guillaume POIRIER]

Hi,

On 6/1/05, Gilles Hamel <hamel_g at club-internet.fr> wrote:
> Hello,
> 
> I have a trancontinent TR100 hardware player powered by MT1389 chip.
> Since 1.0pre7, divx encoded by mplayer doesn't work. I have sound only,
> but no video. I use "-ovc lavc -lavcopts vcodec=mpeg4" to encode. An
> interesting clue is when i mplay in verbose mode the same divx encoded
> with 1.0pre6 and 1.0pre7, I get some differences :
> 
> $ mplayer -v exemple_encoded_with_1.0pre6.avi
> ...
> ====== STREAM Header =====
> Type: vids   FCC: DIVX (58564944)
> ...
> ======= VIDEO Format ======
>    biCompression 1482049860='DIVX'
> ...
> Software  : MEncoder 1.0pre6-3.3.4
> ...
> VIDEO:  [DIVX]  720x304  24bpp  25.000 fps  1355.2 kbps (165.4 kbyte/s)
> [V] filefmt:3  fourcc:0x58564944  size:720x304  fps:25.00  ftime:=0.0400
> 
> $ mplayer -v exemple_encoded_with_1.0pre7.avi
> ...
> ====== STREAM Header =====
> Type: vids   FCC: FMP4 (34504D46)
> ...
> ======= VIDEO Format ======
> biCompression 877677894='FMP4'
> ...
> Software  : MEncoder 1.0pre7-3.3.4
> ...
> VIDEO:  [FMP4]  720x304  24bpp  25.000 fps  1361.2 kbps (166.
> [V] filefmt:3  fourcc:0x34504D46  size:720x304  fps:25.00  ft
> 
> If I patch exemple_encoded_with_1.0pre7.avi file with DIVX tag, the divx
> works fine.
> It seems that my hardware player doesn't like FMP4 tag !
> 
> I see there is a atag option, but no vtag ...
> Why this change in 1.0pre7 ? it's an important compatibility issue !
> Is there a workaround by modifying the codecs.conf file ?

Use "-ffourcc".

I you need more informations about this change (done by the ffmpeg
project), dig the ML.

Guillaume
-- 
Jazz music and Open Source development looks like chaos to an
untrained eye, but end-up producing masterpieces like "Kind of Blue"
and "MPlayer".
That's why I love them both...
  -- John Coltrane