Here is related logs from libav, there is no picture...
Nov 11 12:04:21 ubuntu tvheadend[13113]: transcode: 0001: 01:MPEG2VIDEO: ==> Using profile vaapi-h265
Nov 11 12:04:21 ubuntu tvheadend[13113]: transcode: 0001: 02:MPEG2AUDIO: ==> Using profile webtv-aac
Nov 11 12:04:21 ubuntu tvheadend[13113]: transcode: 0001: 03:DVBSUB: ==> Copy
Nov 11 12:04:21 ubuntu tvheadend[13113]: transcode: 0001: 05:DVBSUB: ==> Filtered out
Nov 11 12:04:21 ubuntu tvheadend[13113]: TS: Telia Turku/250MHz/Yle TV1 Transport error indicator (total 1)
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Format yuv420p chosen by get_format().
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: detected 12 logical cores
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVFilter: Setting 'time_base' to value '1/90000'
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVFilter: Setting 'sample_rate' to value '48000'
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVFilter: Setting 'sample_fmt' to value 's16p'
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVFilter: Setting 'channel_layout' to value 'stereo'
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVFilter: tb:1/90000 samplefmt:s16p samplerate:48000 chlayout:stereo
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVFilterGraph: query_formats: 3 queried, 6 merged, 0 already done, 0 delayed
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: SWResampler: Using s16p internally between filters
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVFilter: ch:2 chl:stereo fmt:s16p r:48000Hz -> ch:2 chl:stereo fmt:fltp r:48000Hz
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Skipping B slice due to open GOP
Nov 11 12:04:21 ubuntu tvheadend[13113]: message repeated 107 times: [ libav: AVCodecContext: Skipping B slice due to open GOP]
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: Opened VA display via DRM device /dev/dri/renderD128.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: libva: VA-API version 1.5.0
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: libva: va_getDriverName() returns 0
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: libva: Trying to open /usr/lib/x86_64-linux-gnu/dri/radeonsi_drv_video.so
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: libva: Found init function __vaDriverInit_1_5
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: libva: va_openDriver() returns 0
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: Initialised VAAPI connection: version 1.5
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: Format 0x3231564e -> nv12.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: Format 0x30313050 -> p010le.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: Format 0x36313050 -> unknown.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: Format 0x32315659 -> yuv420p.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: Format 0x56595559 -> unknown.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: Format 0x59565955 -> uyvy422.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: Format 0x41524742 -> bgra.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: Format 0x41424752 -> rgba.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: Format 0x58524742 -> bgr0.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: Format 0x58424752 -> rgb0.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: VAAPI driver: Mesa Gallium driver 19.2.1 for Radeon RX 570 Series (POLARIS10, DRM 3.33.0, 5.3.0-19-generic, LLVM 9.0.0).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWDeviceContext: Driver not found in known nonstandard list, using standard behaviour.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x2.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Direct mapping disabled: deriving image does not work: 1 (operation failed).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x3.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x4.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x5.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x6.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x7.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x8.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x9.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0xa.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0xb.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0xc.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0xd.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0xe.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0xf.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x10.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x11.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x12.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x13.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x14.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x15.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x16.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x17.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x18.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x19.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x1a.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x1b.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x1c.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x1d.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x1e.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x1f.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x20.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x21.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Input surface format is nv12.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Using VAAPI profile VAProfileHEVCMain (17).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Using VAAPI entrypoint VAEntrypointEncSlice (6).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Using VAAPI render target format YUV420 (0x1).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Using constant-quality mode.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Using intra and P-frames (supported references: 1 / 0).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Driver does not support some wanted packed headers (wanted 0xd, found 0).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Using nv12 as format of reconstructed frames.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x22.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Direct mapping disabled: deriving image does not work: 1 (operation failed).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x23.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x24.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Using fixed QP = 25 / 25 / 30 for IDR- / P- / B-frames.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Using level 3.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVFilter: Setting 'video_size' to value '720x576'
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVFilter: Setting 'pix_fmt' to value 'yuv420p'
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVFilter: Setting 'time_base' to value '1/50'
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVFilter: Setting 'pixel_aspect' to value '64/45'
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVFilter: w:720 h:576 pixfmt:yuv420p tb:1/50 fr:0/1 sar:64/45 sws_param:
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVFilter: Setting 'pix_fmts' to value 'nv12|vaapi_vld'
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVFilter: w:iw h:ih flags:'bilinear' interl:0
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVFilter: auto-inserting filter 'auto_scaler_0' between the filter 'Parsed_yadif_0' and the filter 'Parsed_format_1'
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVFilterGraph: query_formats: 5 queried, 3 merged, 1 already done, 0 delayed
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVFilter: w:720 h:576 fmt:yuv420p sar:64/45 -> w:720 h:576 fmt:nv12 sar:64/45 flags:0x2
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: hwupload: Surface format is nv12.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Created surface 0x26.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Direct mapping disabled: deriving image does not work: 1 (operation failed).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Map surface 0x26.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Unmap surface 0x26.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Encode frame: 720x576 (48959).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Pictures ending truncated GOP:
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext:
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Pictures:
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: IDR (0/0)
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext:
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Issuing encode for pic 0/0 as type IDR.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: No reference pictures.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Input surface is 0x26.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Recon surface is 0x24.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Allocated output buffer 0x27
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Output buffer is 0x27.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Param buffer (22) is 0x28.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Param buffer (23) is 0x29.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Slice 0: 0-17 (18 rows), 0-413 (414 blocks).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Param buffer (24) is 0x2a.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Sync to pic 0/0 (input surface 0x26).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Output buffer: 12064 bytes (status 10101010).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Output read for pic 0/0.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Map surface 0x26.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Unmap surface 0x26.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Encode frame: 720x576 (52559).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Pictures:
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: IDR (0/0)
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: P (1/1)
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext:
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Issuing encode for pic 1/1 as type P.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Refers to:
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: 0/0
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: .
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Input surface is 0x26.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Recon surface is 0x23.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Output buffer is 0x27.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Param buffer (23) is 0x28.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Slice 0: 0-17 (18 rows), 0-413 (414 blocks).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Param buffer (24) is 0x29.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Sync to pic 1/1 (input surface 0x26).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Output buffer: 5880 bytes (status 10101010).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Output read for pic 1/1.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Map surface 0x26.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVHWFramesContext: Unmap surface 0x26.
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Encode frame: 720x576 (56159).
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: Pictures:
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: P (1/1)
Nov 11 12:04:21 ubuntu tvheadend[13113]: libav: AVCodecContext: P (2/2)