[FFmpeg-devel] FFV1.3

Dave Rice daverice at mac.com
Wed Apr 25 03:07:54 CEST 2012

On Apr 24, 2012, at 8:35 PM, Michael Niedermayer wrote:

> On Tue, Apr 24, 2012 at 08:05:27PM -0400, Dave Rice wrote:
>> Hi,
>> On Apr 20, 2012, at 9:50 AM, Michael Niedermayer wrote:
>>> Hi
>>> Ive just commited some changes to the ffv1 codec v1.3
>> I downloaded from git-master and changed line 900 of ffv1.c to "    s->version=3;" in order to start some testing. So far I haven't gotten any files to encode and have been getting an error on the slice number regarding of the source content. Here's an example output using testsrc as an input.
> it need something like -slices 4 

Thanks that worked. With ffv1 version 1.3 and -slices 4 I'm getting 81 fps encoding whereas version 1.0 on the same content gave 31 fps.
On my Mac files encoded with ffv1 version 1.3 cause crashes with the latest releases of QuickTime with Perian, VLC, and but works with with ffplay when the version of ffv1.c is set to 0 or to 3.

So far with sampling various source content at various bits I've found that both the resulting ffv1 version 1 and version 3 produce the same framemd5s.

In ffv1.c I noticed that a CRC mismatch warning could be given but wasn't able to find a situation to actually produce this warning.
Dave Rice

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