Re: [FFmpeg-user] nvenc ffmpeg

[Roger Allen]

On Mon, May 16, 2016 at 2:50 AM, Аз Есмь  wrote:
> i've got the same problem. GeForce GT 610, nVidia driver 361.42, Kubuntu 
> 16.04.

Supported GPUs are listed here:
https://developer.nvidia.com/nvidia-video-codec-sdk#gpulist which for
GeForce cards can be summarized as "Kepler & Maxwell GPUs only".

According to https://en.wikipedia.org/wiki/GeForce_600_series the GT
610 is a GF119 or Fermi card.  That came out prior to the Kepler cards
that first included NVENC.
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Re: [FFmpeg-user] nvenc ffmpeg

[Roger Allen]

On Sat, May 14, 2016 at 5:36 AM, gofrane  wrote:
>
>  ffmpeg -y -i input.mp4  -vcodec  nvenc -b:v 5M  -acodec copy OUTPUT.mp4*
>
snip

> [nvenc @ 0x2721540] No NVENC capable devices found
>

This seems like it is the likely error to focus on.  Are you sure your
NVIDIA GPU has NVENC?  Do you have recent drivers installed?
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Re: [FFmpeg-user] concat images to h.264 movie not working

[Roger Allen]

I can confirm that putting the "-r 30" to just prior to the -i option works
well for me.  Thanks again, Moritz.

I will say that a 25Hz -> 30Hz resampling doesn't seem like it should drop
all but 2 frames.  But, that wasn't really what I wanted either.  I wanted
a straight 30Hz rate without resampling.

On Mon, Dec 7, 2015 at 5:29 PM, Marton Balint  wrote:
> Is this a regression?

In my opinion, this appears to be a regression.  This worked as I expected
(or close enough) with ffmpeg 1.1.3 on my Mac.

> Does this work OK if duration is specified in the concat file for each
file?

It appears to work without any DTS/PTS errors if I specify 'duration
0.033' after each file statment.

> I have a feeling that the concat demuxer never worked well with static
images and unknown duration.

I see 1.1.3 working.  I'm new around here, but it seems overly pedantic to
force users to add a constant duration value in between every line for such
a simple case.

--Roger
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Re: [FFmpeg-user] concat images to h.264 movie not working

[Roger Allen]

> Why don't *you* show us *your* exact command's output?

I included a pointer at the end of the email.  I regret that was not more
obvious to you.  Please see
https://gist.github.com/rogerallen/426203d3a580898bd864

> If I switch your "-r" option to become an input option

Thank you.  I will try that.  To be sure I understand, that is moving the
"-r 30" to just prior to the -i option?

--Roger



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[FFmpeg-user] concat images to h.264 movie not working

[Roger Allen]

Hi,

I have an older build of ffmpeg (1.1.3) on my Mac and I'm able to put a
list of png images in a file and use ffmpeg to create a h264 encoded movie.

Trying to do the same thing on a PC with the most recent build
(ffmpeg-20151205-git-a16243a-win64-static) results in "DTS" errors and a
file that has just a couple frames in it.  A large number of images
produces a massive stream of errors.

I saw https://trac.ffmpeg.org/ticket/4765 and the related discussion
http://ffmpeg-users.933282.n4.nabble.com/DTS-Out-of-Order-DTS-amp-PTS-Invalid-Dropping-td4667944.html
and it seems related to what I'm seeing.  It sounds as if the simple case
of creating a movie just from images has regressed.

For a testcase, I've uploaded some loopable public domain test images to
http://imgur.com/a/TVyJT (under Post Options at the bottom, choose download
album)

The commands I run are (in a bash shell)

printf "file '%s'\n" ./*.png > test_ffmpeg.list
ffmpeg \
-f concat -i test_ffmpeg.list \
-r 30 -pix_fmt yuv420p \
-c:v libx264 -preset slow \
Muybridge_race_horse_animated.mp4

On my Mac, this creates a nice loopable movie.  On the PC it creates a
2-frame movie.  Am I doing something wrong or is there a bug?

Thanks,

Roger

p.s. logfiles & script are at
https://gist.github.com/rogerallen/426203d3a580898bd864
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