[MPlayer-dev-eng] [PATCH] ffvhuff: encoded frame too large

[Loren Merritt]

On Mon, 25 Jun 2007, infernix wrote:
> Loren Merritt wrote:
>> On Fri, 13 Apr 2007, infernix wrote:
>>> I'm encoding to a large resolution ffvhuff file (source is 1920x1040) and 
>>> am occasionally getting this message from mencoder:
>>> [ffvhuff @ 0x8847980]encoded frame too large
>>> Does anyone know what happens to a frame when this error occurs? Does it 
>>> get discarded? Is it because I'm encoding to avi?
>
>> MEncoder allocates a constant buffer size of 2MB to hold a compressed 
>> frame. 1080p is 3MB uncompressed, and huffyuv (or any lossless codec) can't 
>> always compress a 3MB frame into less than 2MB.
>> Solution: increase the buffer size, and/or make it dynamic.
>
> Is there any reason why this defaults to 2MB in svn? I keep patching it to 
> 4MB for every build, and I can't imagine it would hurt to change it to that 
> by default - but IANAC.

No, but there's also no reason to expect 4MB, or any other constant size, 
is enough. And no one has implemented a variable size buffer yet. The 
simplest incarnation of that might be to add something to lavc's api 
allowing each encoder to guess in advance how big its frames can get.

--Loren Merritt