[FFmpeg-user] Impossible to convert between the formats supported by the filter 'Parsed_null_0' and the filter 'auto_scaler_0'

[Garri Djavadyan]

Hello FFmpeg community,


Recently, I faced transcoding issues with fully hardware nvdec/nvenc 
scheme. Particularly, my FFmpeg feed fails with the following error 
after 30-60 minutes of live transcoding:

---
[h264_cuvid @ 0x556e21e67e00] Initializing cuvid hwaccel
[h264_cuvid @ 0x556e21e67e00] Initializing CUDA frames context: 
sw_format = nv12, width = 720, height = 576
[h264_cuvid @ 0x556e21e67e00] Format cuda chosen by get_format().
[h264_cuvid @ 0x556e21e67e00] Formats: Original: cuda | HW: cuda | SW: 
nv12
[graph 0 input from stream 0:16 @ 0x556e28bcd500] Setting 'video_size' 
to value '720x576'
[graph 0 input from stream 0:16 @ 0x556e28bcd500] Setting 'pix_fmt' to 
value '119'
[graph 0 input from stream 0:16 @ 0x556e28bcd500] Setting 'time_base' to 
value '1/90000'
[graph 0 input from stream 0:16 @ 0x556e28bcd500] Setting 'pixel_aspect' 
to value '16/11'
[graph 0 input from stream 0:16 @ 0x556e28bcd500] Setting 'sws_param' to 
value 'flags=2'
[graph 0 input from stream 0:16 @ 0x556e28bcd500] Setting 'frame_rate' 
to value '25/1'
[graph 0 input from stream 0:16 @ 0x556e28bcd500] w:720 h:576 
pixfmt:cuda tb:1/90000 fr:25/1 sar:16/11 sws_param:flags=2
[scaler_out_0_0 @ 0x556e280d4380] Setting 'w' to value '720'
[scaler_out_0_0 @ 0x556e280d4380] Setting 'h' to value '576'
[scaler_out_0_0 @ 0x556e280d4380] Setting 'flags' to value 'bicubic'
[scaler_out_0_0 @ 0x556e280d4380] w:720 h:576 flags:'bicubic' interl:0
[format @ 0x556e23b23600] Setting 'pix_fmts' to value 'cuda'
[auto_scaler_0 @ 0x556e2596efc0] Setting 'flags' to value 'bicubic'
[auto_scaler_0 @ 0x556e2596efc0] w:iw h:ih flags:'bicubic' interl:0
[scaler_out_0_0 @ 0x556e280d4380] auto-inserting filter 'auto_scaler_0' 
between the filter 'Parsed_null_0' and the filter 'scaler_out_0_0'
Impossible to convert between the formats supported by the filter 
'Parsed_null_0' and the filter 'auto_scaler_0'
Error reinitializing filters!
Failed to inject frame into filter network: Function not implemented
Error while processing the decoded data for stream #0:16
[AVIOContext @ 0x556e21e02e40] Statistics: 0 seeks, 9266 writeouts
[h264_nvenc @ 0x556e21e69cc0] Nvenc unloaded
[libfdk_aac @ 0x556e21e3abc0] 2 frames left in the queue on closing
[AVIOContext @ 0x556e21da2d80] Statistics: 1869799120 bytes read, 0 
seeks
Conversion failed!
---


As I understand, some parameters change after 30-60 minutes in video 
stream and FFmpeg tries to use software scaler in fully hardware scheme. 
But I can't figure out exact reasons to act against the problem. I will 
be very grateful if someone could direct me. I use following cmd line:

---
/usr/local/ffmpeg/bin/ffmpeg -analyzeduration 100M -probesize 100M 
-loglevel debug -hwaccel_device 1 -hwaccel cuvid -c:v h264_cuvid -deint 
2 -drop_second_field 1 -i 
udp://224.4.4.13:1013?fifo_size=250000&overrun_nonfatal=1 -map p:1011:0 
-map p:1011:1 -c:v h264_nvenc -profile:v high -level 4.1 -b:v 2048k -c:a 
libfdk_aac -b:a 128k -af aresample=async=1000 -f mpegts 
http://192.168.0.10/15/mpegts
---


Many thanks in advance!

Garri