[FFmpeg-user] Issue with hwaccel cuvid

[Andy Sheimo]

Dennis, Thank you. Lesson learned, check latest builds before submitting
questions. Using the latest static build has resolved the issue.

Cheers, -Andy

On Wed, Apr 8, 2020 at 12:14 PM Dennis Mungai <dmngaie at gmail.com> wrote:

> On Wed, 8 Apr 2020 at 19:04, Andy Sheimo <asheimo at gmail.com> wrote:
>
> > This still produces the same error;
> >
> > ffmpeg -threads 1 -loglevel verbose -hwaccel cuvid
> > -hwaccel_output_format cuda -c:v mpeg2_cuvid -extra_hw_frames 3 -i
> > "l:\welter_originals\gamera the brave\Latatude Zero-trailer.mkv" -c:a
> copy
> > -c:v h264_nvenc test.mkv
> >
> > But this works to complete the job;
> >
> > ffmpeg -threads 1 -loglevel verbose -hwaccel cuda
> > -hwaccel_output_format cuda -extra_hw_frames 3 -i
> > "l:\welter_originals\gamera the brave\Latatude Zero-trailer.mkv" -c:a
> copy
> > -c:v h264_nvenc test.mkv
> >
> > By not specifying  -c:v mpeg2_cuvid do we know what decoder is being
> used?
> > Is the process still completely in hardware? Do you think this is a
> > limitation of the cuvid decoder?
> >
> > Thanks for your help. -Andy
> >
>
> NVDEC (an alias to the CUDA hwaccel) handles GPU memory quite differently
> from CUVID, and when its' in use, the decoder is not specified.
> CUVID, however, was never a true hwaccel, but rather a "wrapper" that
> "brings up"/initializes a specific decoder by name passed to it via -c:v,
> in a similar fashion to the bring-up seen with QuickSync (-hwaccel qsv).
>
> I cannot speak much about why CUVID is failing on your end. I migrated all
> my workflows to NVDEC an year ago.
>
> Perhaps omitting the hwacccel_output_format with CUVID will help?
>
> Try this:
>
> ffmpeg -threads 1 -loglevel verbose -hwaccel cuvid
> -c:v mpeg2_cuvid -extra_hw_frames 3 -i
> "l:\welter_originals\gamera the brave\Latatude Zero-trailer.mkv" -c:a copy
> -c:v h264_nvenc test.mkv
>
> Then report back.
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