[GEM-dev] Gem says quicktime ok, then disagrees with itself

[B. Bogart]

Hey Guenter,

This is an interesting suggestion. I can't try it now since I'm away
from that machine.

Does it imply that ffmpeg uses the filename to check filetype? Or only
as a last resort when the magic number test fails?

So if the codec is "DV" then this quicktime is not at all involved? No
QT headers or anything? This may explain why qtinfo says the file is not
a quicktime... I'm confused why this "codec" would not require a
"container" format though... oy!

Anyhow I'll try it tomorrow.

Oh and BTW I can use ffplay to decode three DV videos at the same time,
using about 80% CPU on my new Athlon64 3200. no dropped frames visible..
pretty handy.

B.

� wrote:
>
> Hi,
>
> Have you tried to rename it to dv.dv (other extension !)
> Maybe it is not a quicktime file after all.
>
> Guenter
>
>
> On Wed, 29 Jun 2005, B. Bogart wrote:
>
>
>>Hey again,
>>
>>Well after a LOT more digging I found some things out. First off I
>>realised that mplayer was decoding my DV MOV with ffmpeg. Good news, so
>>I messed with ffplay some more and finally got it to load my MOV the
>>same as totem & mplayer (using ffmpeg).
>>
>>So the issue seems to be that ffmpeg does not know what kind of file it
>>is, but knows how to decode it.
>>
>>ffplay dv.mov
>>
>>gives:
>>
>>unkown format
>>
>>ffplay -f dv dv.mov
>>
>>Works!!!
>>
>>So we need to force ffmpeg to try a certain codec in this case... Is
>>this possible from inside Gem? Clearly ffmpeg is much better at decoding
>>than recognizing formats, could there be a manual mode to specify the
>>codec manually to pix_film ? Or is there some other library (code from
>>mplayer?) that actually IS good at recognizing formats? mplayer actually
>>tries to load the DV file with qdv.dll but since it is not on my system
>>it gives up and tries ffmpeg, and clearly tells it what format to expect.
>>
>>So I feel much closer to loading this file in Gem, what do I need to do
>>to get it to actually work? (now that it is clear that ffmpeg will play
>>it).
>>
>>Thanks.
>>
>>B>
>>
>>
>>
>>IOhannes m zmoelnig wrote:
>>
>>>B. Bogart wrote:
>>>
>>>
>>>i think i have already said this before, but i have to admit (again)
>>>that i haven't been able to open _any_ video with FFMPEG (i/o error).
>>>probably making this work would help....
>>>
>>>
>>>mfg.asdr.
>>>IOhannes
>>>
>>>_______________________________________________
>>>GEM-dev mailing list
>>>GEM-dev at iem.at
>>>http://lists.puredata.info/listinfo/gem-dev
>>>
>>
>
>
> _______________________________________________
> GEM-dev mailing list
> GEM-dev at iem.at
> http://lists.puredata.info/listinfo/gem-dev
>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 256 bytes
Desc: OpenPGP digital signature
URL: <http://lists.puredata.info/pipermail/gem-dev/attachments/20050629/b94291ab/attachment.pgp>