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• How to split and scale streams in ffmpeg with cuda ?

  30 décembre 2020, par Samyak

  So, I want to create streams of multiple resolutions for hls streaming. Here's what I've tried so far :

  


  ffmpeg -vsync 0 -hwaccel cuvid -i input.mkv -c:a aac -c:v h264_nvenc \
-c:s webvtt -crf 20 -filter_complex \
'[v:0]hwupload_cuda,split=2[vtemp001][vout002]:[vtemp001]hwupload_cuda,scale_npp=w=960:h=540:format=yuv420p:interp_algo=lanczos,hwdownload,format=yuv420p[vout001]'  \
-map "[vout001]" -b:v:0 2000k -map "[vout002]" \
-b:v:1 6000k -map 0:v -map 0:a -map 0:s -map 0:v \ 
-map 0:a -map 0:s -var_stream_map 'v:0,a:0,s:0 v:1,a:1,s:1' \ 
-force_key_frames:v "expr:gte(t,n_forced*2.000)" -hls_time 6 -hls_playlist_type event -hls_flags \
delete_segments+independent_segments+discont_start+program_date_time \
-master_pl_name master.m3u8 -hls_segment_filename \
fire/segment_%v/file%06d.ts fire/stream_%v.m3u8


  


  Running this, I am getting the following error :

  


  Impossible to convert between the formats supported by the filter 
'graph 0 input from stream 0:0' 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 #0:0


  


  When I do the same thing without gpu, I am getting an out of memory error which to me sounds like I can't do this without a gpu (i.e I have to run separate ffmpeg commands to get this to run on the CPU). Would love to know if anyone has any insights or suggestions.

  


  I tried something more easy to understand here :

  


  ffmpeg -vsync 0 -hwaccel cuvid -i input.mkv -c:v h264_nvenc -filter_complex \
'[v:0]hwupload_cuda,split=2[vtemp001][vout002];[vtemp001]hwupload_cuda,scale_npp=w=960:h=540:format=yuv420p:interp_algo=lanczos,hwdownload,format=yuv420p[vout001]' \
-map "[vout001]" -b:v:0 2000k output1.mkv -map "[vout002]" -b:v:1 6000k output2.mkv


  


  The above gives the same error which to me suggests that the issue is with the filter complex.

  


• How to get coordinates, scale, and rotation data of a widget in flutter ?

  15 octobre 2020, par Sarthak Singhal

  I am working an app in flutter in which user can add image on a video like the given screenshot. The user should be able to move the image widget anywhere on the screen, resize it, and rotate it also.

  


  For now I have used Stack and MatrixGestureDetector to let the user move the images on the screen.

  


  From the user placed image I would like to acquire :

  


  

  • position/coordinates

  


  • scale

  


  • rotation

  


  


  This data will then be used in ffmpeg, but this question is only about getting the placement data.

  


  Example of image and draw text in canvas over a video :

  


  

  


• How to get exact coordinats, scale and rotation of a widget in flutter to use with ffmpeg

  12 octobre 2020, par Sarthak Singhal

  I am working an app in flutter in which user can add image on a video like the given screenshot. The user should be able to move the image widget anywhere on the screen, resize it, and rotate it also.

  


  For now I have used Stack and MatrixGestureDetector to let the user move the images on the screen.

  


  I want to know how to merge this image along with the exact scale, rotation and position as seen on the screen to use with ffmpeg.