[FFmpeg-user] Problem with astats and adrawgraph

[Paul B Mahol]

On 11/25/19, Michael Koch <astroelectronic at t-online.de> wrote:
> Am 25.11.2019 um 12:04 schrieb Paul B Mahol:
>> On 11/25/19, Michael Koch <astroelectronic at t-online.de> wrote:
>>> Am 25.11.2019 um 00:08 schrieb Michael Koch:
>>>> I just found the solution to this problem myself:
>>>> astats=metadata=1:reset=1,adrawgraph=m1=lavfi.astats.1.RMS_level
>>>>
>>>> The underline character is missing in the documentation, where the
>>>> option is called "RMS level dB". Same problem for most other options
>>>> too.
>>>
>>> This command line works as expected:
>>>
>>> c://ffmpeg/ffmpeg -i P1000479.mov -lavfi
>>> astats=metadata=1:reset=1,adrawgraph=m1=lavfi.astats.1.RMS_level:mode=line:slide=scroll:min=-90:max=0
>>> -pix_fmt yuv420p -t 5 -y test.mp4
>>>
>>>
>>> However when I try to do exactly the same thing two times and combine
>>> the videos with vstack, then I get warnings "More than 1000 frames
>>> duplicated" "More than 10000 frames duplicated" and FFmpeg becomes
>>> extremely slow:
>>>
>>> c://ffmpeg/ffmpeg -i P1000479.mov -lavfi
>>> [0]astats=metadata=1:reset=1,adrawgraph=m1=lavfi.astats.1.RMS_level:mode=line:slide=scroll:min=-90:max=0[1];[0]astats=metadata=1:reset=1,adrawgraph=m1=lavfi.astats.1.RMS_level:mode=line:slide=scroll:min=-90:max=0[2];[1][2]vstack
>>> -pix_fmt yuv420p -t 5 -y test.mp4
>>>
>>> What's wrong with this command line?
>> Can not reproduce.
>> Please provide input files.
>
> www.astro-electronic.de/P479_1s.mov
>
> This is a one second segment of my video (and is produces the same
> warnings as above), made with
> ffmpeg -i P1000479.mov -c:v copy -c:a copy -t 1 -y P479_1s.mov
> It's normal that the content is mostly black (with a few stars) and
> audio is only background noise.

Still can not reproduce it. Make sure you use latest ffmpeg version.

>
> Michael
>
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