[FFmpeg-user] Error: Impossible to convert between the formats...(Nvidia codecs)

[Ben Parham]

Thank you, Dennis. By removing _pix_fmt the issue was solved.
But when I change the preset from p2 to p3 or p4, I face this error:

[hevc @ 000001ebb41bdc40] hardware accelerator failed to decode picture
[hevc @ 000001ebb41bb440] Could not find ref with POC 24
[rtsp @ 000001ebb42500c0] Invalid DTS: 126000 PTS: 118800 in output stream
0:0, replacing by guess
Error while decoding stream #0:0: Generic error in an external library
[hevc @ 000001ebb41bbc40] No decoder surfaces left
[hevc @ 000001ebb41bbc40]
decoder->cvdl->cuvidDecodePicture(decoder->decoder, &ctx->pic_params)
failed -> CUDA_ERROR_INVALID_VALUE: invalid argument

Could you help me to fix this error please?


On Sat, Jul 9, 2022 at 6:11 PM Dennis Mungai <dmngaie at gmail.com> wrote:

> On Sat, 9 Jul 2022 at 12:45, DEF <shaker.doc at gmail.com> wrote:
>
> > On Sat, 9 Jul 2022 at 08:25, Ben Parham <behfarteam at gmail.com> wrote:
> > >
> > > Hello,
> > >
> > > I try to use Nvidia codecs in live transcoding. The input stream is
> from
> > an
> > > IP camera (Hikvision) and its color format is "*yuvj420p*". My command
> > is:
> > >
> > > ffmpeg.exe -y -hwaccel cuda -hwaccel_output_format cuda -rtsp_transport
> > tcp
> > > -i "rtsp://admin:Pass1@192.168.1.1" -flags +low_delay -vcodec
> hevc_nvenc
> > > -s 1920x1080 -preset p2 -pix_fmt yuv420p -tune hq -rc vbr -vb 700k
> > -maxrate
> > > 800k -minrate 200k -bufsize 800k -g 25 -acodec copy -strict -2 -flags
> > > +global_header -f rtsp "rtsp://localhost:8000/stream"
> >
> > Check out documenation at
> >
> >
> https://docs.nvidia.com/video-technologies/video-codec-sdk/ffmpeg-with-nvidia-gpu/
> >
> > Use -vsync 0 option with decode to prevent FFmpeg from creating output
> > YUV with duplicate and extra frames.
> > This seems to be the commonest runtime issue.
> >
> > Try
> > ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda
> > rtsp_transport tcp -i "rtsp://admin:Pass1@192.168.1.1" -flags
> > +low_delay -vcodec hevc_nvenc -vf scale_cuda=1920:1080 -preset p2
> > -pix_fmt yuv420p -tune hq -rc vbr -vb 700k -maxrate  800k -minrate
> > 200k -bufsize 800k -g 25 -acodec copy -strict -2 -flags +global_header
> > -f rtsp "rtsp://localhost:8000/stream"
> >
> >
> > Def
> >
>
> The error may have to do with the specified pixel format filter in the
> command line, specifically  " -pix_fmt yuv420p".
> Remove that and retest with a command such as this one:
>
> ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda
> rtsp_transport tcp -i "rtsp://admin:Pass1@192.168.1.1" -flags
> +low_delay -vcodec hevc_nvenc -vf scale_cuda=1920:1080 -preset p2
> -tune hq -rc vbr -vb 700k -maxrate  800k -minrate
> 200k -bufsize 800k -g 25 -acodec copy -strict -2 -flags +global_header
> -f rtsp "rtsp://localhost:8000/stream"
>
> With CUDA/NVDEC hwaccel, the default pixel format will be CUDA. Inserting a
> request for another format via "-pix_fmt yuv420p" as is would fail, as it
> introduces the need for hwdownload and format conversion which isn't
> automatic.
> Please retest and report back.
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