[mythtv-users] Status of ffmpeg 4.4.1

[Klaas de Waal]

On Fri, 5 Nov 2021 at 22:49, Klaas de Waal <klaas.de.waal at gmail.com> wrote:

>
>
>
> On Fri, 5 Nov 2021 at 21:43, Peter Bennett <pb.mythtv at gmail.com> wrote:
>
>>
>> On 11/5/21 3:17 PM, Klaas de Waal wrote:
>>
>>
>>
>> On Wed, 3 Nov 2021 at 20:30, Peter Bennett <pb.mythtv at gmail.com> wrote:
>>
>>> Most things are working with ffmpeg 4.4.1 in the devel/ffmpeg-resync
>>> branch
>>>
>>> What is not working:
>>>
>>> - Audio "upconvert stereo to 5.1 sound" when playing a video with stereo
>>> sound - error message and no audio playback .
>>>
>>> - Speedup / slowdown when playing a video with dolby 5.1 audio - error
>>> message and no audio playback .
>>>
>>> - Report from John Pilkington that an existing bug with edit markers and
>>> step lengths now reacts slightly differently - I don't know if it is
>>> better or worse with the new ffmpeg.
>>>
>>> I am looking into the 5.1 audio issues.
>>>
>>> Peter
>>>
>>>
>>> Hi Peter,
>>
>> As mentioned in the mythtv-dev mailing list, there are with the new
>> FFmpeg often blocking artifacts when starting playback and when jumping
>> forward and backward.
>> This happens also on recordings made with the old FFmpeg so it looks to
>> me like a playback-only issue.
>> I do see this on my cable TV recordings which are H264, 1080i interlaced
>> 50/25 frames per second, both HD and SD.
>> I do NOT see this on Bluray rips which are 24p.
>> I also do not see this on recordings with MPEG2 video coding, only on
>> H264.
>>
>> Hope you can have a look into this also,
>>
>> Thanks,
>> Klaas.
>>
>>
>>
>> I am not able to reproduce this on the devel/ffmpeg-resync branch. I
>> tried with NVDEC and with OpenGL playback profiles. Which playback profile
>> are you using?
>>
>>
>>  Hi Peter,
>
> Looks like it happens with VDPAU only. NVDEC, OpenGL and VAAPI (that on
> Intel hardware) are OK.
> So the failing combination is VDPAU/H264/interlaced.
>
> Tested some more on other recordings and there are also blocking artifacts
with NVDEC, but less pronounced and also sometimes the stream makes a
difference. If it is difficult to reproduce I can create a ticket for this
and attach photographs and clips.

Thanks,
Klaas.
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