[FFmpeg-devel] [PATCH v9] lavc/rawdec: Remove monowhite switching code for 1 bpp AVI without a palette

Mats Peterson matsp888 at yahoo.com
Sat Feb 13 13:00:08 CET 2016


On 02/13/2016 12:58 PM, Mats Peterson wrote:
> On 02/13/2016 12:57 PM, Mats Peterson wrote:
>> On 02/13/2016 12:54 PM, Mats Peterson wrote:
>>> On 02/13/2016 12:52 PM, Mats Peterson wrote:
>>>>>> just double checked, this is not the case in written pal8 nut files
>>>>>> nor does the nut spec say anything about that.
>>>>>>
>>>>>
>>>>> Then check an odd-width nut file like the one below. And FFmpeg
>>>>> doesn't
>>>>> care about specs when using "-vcodec copy". The stride will be the one
>>>>> of the original data, whether it's 2, 4 or some other amount of bytes.
>>>>>
>>>
>>> The stride will be *aligned* to 2, 4 or some other amount of bytes.
>>>
>>> Mats
>>>
>>
>> Try "ffmpeg -i 8bpp_129.avi -vcodec rawvideo 8bpp_129.nut" with the file
>> below. It will have a stride aligned to 4 bytes like the original AVI
>> file, and per the Microsoft specification, since it doesn't "-vcodec
>> copy" won't touch the video data.
>>
>> https://drive.google.com/open?id=0B3_pEBoLs0faekxWUTdkVGNTTlk
>> _______________________________________________
>
> I mean "ffmpeg -i 8bpp_129.avi -vcodec copy 8bpp_129.nut" of course.
>
> Mats
>

The stride will be 132 bytes, divisible by 4, rather than 129 bytes.

Mats



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