[FFmpeg-user] "Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)" error

[Andriy Gelman]

Hi Mohammed,

Could you create a ticket on https://trac.ffmpeg.org/ and upload the sample
pls.

Thanks,
Andriy

On Thu, 2 Jul 2020 at 07:24, Mohammed Bey Ahmed Khernache <
mohbeyinfo at gmail.com> wrote:

> Hello,
> I am facing an error when trying to decode HEVC-coded content for some
> video sequences.
> I varied the video resolution as follows:
> 2160p: decoded successfully
> 1600p:  decoded successfully
> 1080p: error
> 720p: error
>
> When I try to decode low resolutions (720p and 1080p), ffmpeg outputs the
> following error message: "Output file is empty, nothing was encoded (check
> -ss / -t / -frames parameters if used)"
>
> Below are the command line and the output.
>
> -------------------------------------------------------------------------------
> root at linaro-developer:~# ffmpeg -vcodec hevc_v4l2m2m -i
> vary_resolution/kimono/AMP_D_Hisilicon_3_1080p_fps_25.265 -f null out.null
> ffmpeg version 4.3 Copyright (c) 2000-2020 the FFmpeg developers
>   built with gcc 8 (Debian 8.3.0-6)
>   configuration: --enable-gpl --enable-nonfree --enable-static
> --disable-shared --enable-pthreads --enable-neon --enable-thumb
> --enable-optimizations --enable-libv4l2
>   libavutil      56. 51.100 / 56. 51.100
>   libavcodec     58. 91.100 / 58. 91.100
>   libavformat    58. 45.100 / 58. 45.100
>   libavdevice    58. 10.100 / 58. 10.100
>   libavfilter     7. 85.100 /  7. 85.100
>   libswscale      5.  7.100 /  5.  7.100
>   libswresample   3.  7.100 /  3.  7.100
>   libpostproc    55.  7.100 / 55.  7.100
> Input #0, hevc, from
> 'vary_resolution/kimono/AMP_D_Hisilicon_3_1080p_fps_25.265':
>   Duration: N/A, bitrate: N/A
>     Stream #0:0: Video: hevc (Main), yuv420p(tv), 1920x1080, 25 fps, 25
> tbr, 1200k tbn, 25 tbc
> [hevc_v4l2m2m @ 0xaaaae2112410] Using device /dev/video0
> [hevc_v4l2m2m @ 0xaaaae2112410] driver 'qcom-venus' on card 'Qualcomm Venus
> video decoder' in mplane mode
> [hevc_v4l2m2m @ 0xaaaae2112410] requesting formats: output=HEVC
> capture=NV12
> Stream mapping:
>   Stream #0:0 -> #0:0 (hevc (hevc_v4l2m2m) -> wrapped_avframe (native))
> Press [q] to stop, [?] for help
> [hevc_v4l2m2m @ 0xaaaae2112410] VIDIOC_G_FMT ioctl
>     Last message repeated 99 times
> Output #0, null, to 'out.null':
>   Metadata:
>     encoder         : Lavf58.45.100
>     Stream #0:0: Video: wrapped_avframe, yuv420p, 1920x1080, q=2-31, 200
> kb/s, 25 fps, 25 tbn, 25 tbc
>     Metadata:
>       encoder         : Lavc58.91.100 wrapped_avframe
> frame=    0 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.00 bitrate=N/A speed=
>  0x
> video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
> muxing overhead: unknown
> Output file is empty, nothing was encoded (check -ss / -t / -frames
> parameters if used)
>
> -------------------------------------------------------------------------------
>
> *Note*: when I drop the "-vcodec hevc_v4l2m2m" option, the decoding is done
> successfully. But, that's not what I am lookign for. I need the hardware
> acceleration.
>
> Any help is welcome.
>
> Best regards
> Mohammed
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