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

[Mats Peterson]

On 12/19/2015 07:52 AM, Mats Peterson wrote:
> 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
>> _______________________________________________
>> ffmpeg-devel mailing list
>> ffmpeg-devel at ffmpeg.org
>> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> 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
>

Not inheherent, inherent. Nothing funny about this ;)

Mats

-- 
Mats Peterson
http://matsp888.no-ip.org/~mats/