[FFmpeg-user] HEVC acceleration

[Andriy Gelman]

On Wed, 24 Jun 2020 at 10:28, Mohammed Bey Ahmed Khernache <
mohbeyinfo at gmail.com> wrote:

> Hello,
> I am trying to decode HEVC-encoded content using ffmpeg. I am still unable
> to leverage the HEVC accelerator, which is hevc_v4l2m2m in the case of the
> platform I am using, RB3.
> Below are the command and the output.
>
> -----------------------------------------------------------------
> root at linaro-developer:~# ffmpeg -c:v hevc_v4l2m2m  -i blue_sky_fps_25.265
> -f null /dev/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-hwaccel=hevc_v4l2m2m
>   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 'blue_sky_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 @ 0xaaaadc9c13b0] Using device /dev/video1
> [hevc_v4l2m2m @ 0xaaaadc9c13b0] driver 'qcom-venus' on card 'Qualcomm Venus
> video decoder' in mplane mode
> [hevc_v4l2m2m @ 0xaaaadc9c13b0] 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 @ 0xaaaadc9c13b0] VIDIOC_G_FMT ioctl
> free(): double free detected in tcache 2
> Aborted
> -----------------------------------------------------------------
>

Hi Mohammed,

Could you check if this patch solves the double free?
https://patchwork.ffmpeg.org/project/ffmpeg/patch/20200509173541.7667-1-andriy.gelman@gmail.com/

Thanks,
Andriy