[FFmpeg-devel] Vertical bands with RT21 (Intel Real Time Video 2.1) codec

Mats Peterson matsp888 at yahoo.com
Sat Dec 19 07:52:27 CET 2015

On 12/19/2015 07:20 AM, Dave Yeo wrote:
> On 12/18/15 09:54 AM, Paul B Mahol wrote:
>> On 12/18/15, Mats Peterson<matsp888-at-yahoo.com at ffmpeg.org>  wrote:
>>> >On 12/18/2015 05:32 AM, Mats Peterson wrote:
>>>> >>On 12/18/2015 05:12 AM, Mats Peterson wrote:
>>>>> >>>On 12/18/2015 04:13 AM, Mats Peterson wrote:
>>>>>> >>>>Samples:https://drive.google.com/open?id=0B3_pEBoLs0faei1Sd1h6SG11QlE
>>>>>> >>>>
>>>>>> >>>>Mats
>>>>>> >>>>
>>>>> >>>
>>>>> >>>The clips are sample clips from Video for Windows, in case anyone
>>>>> >>>wonders. I haven't created them myself.
>>>>> >>>
>>>>> >>>Mats
>>>>> >>>
>>>> >>
>>>> >>The output is generally washed-out, as well, apart from the bands.
>>>> >>
>>>> >>Mats
>>>> >>
>>> >
>>> >I noticed this issue has been discussed as far back as in 2005 (see
>>> >http://sourceforge.net/p/ffmpeg/bugs/310/), but using the slightly
>>> >different terms "ghosting and shadow effects". In any case, it
>>> obviously
>>> >still hasn't been fixed.
>> No, this is different issue. Do you know a software that actually
>> plays such videos correctly?
> They play correctly using the builtin OS/2 video player, especially at
> the preferred resolution, maybe 240x320. FFplay shows the colours as
> washed out and the banding that is mentioned. If I enlarge the OS/2
> window to the same size as the FFplay window, it looks somewhat staticy
> with vertical lines of static but still much better then FFplay. MPlayer
> plays at the correct resolution but has the same issues as FFplay,
> banding and washed out colours.
> Video for Windows didn't like the fact that I tried to install it on a
> drive with over 2GBs free so didn't test under real hardware.
> Dave
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Yes, and the reason MPlayer has the same issues is because it uses 
FFmpeg to decode the video. Thanks for another "proof". I have used 
Windows 3.1 in dosbox, and it works "fine" there, albeit with a tiny 
hint of vertical bands still showing. As I said before, this is probably 
inheherent to the codec itself.


Mats Peterson

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