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• ffmpeg vaapi - scale a video keeping the aspect ratio and padding with black lines

  26 décembre 2022, par Rusty Lemur

  I'm trying to use my Vega 11 GPU to perform hardware accelerated transcoding of some video files to a resolution of 1280x720. I would like to keep the original aspect ratio and add black bars to the borders as necessary. I can get the scaling to work with the following :

  


  ffmpeg -hwaccel vaapi -hwaccel_output_format vaapi -vaapi_device /dev/dri/renderD128 -i input.mp4 -codec:v h264_vaapi -vf scale_vaapi=w=1280:h=720,setsar=1:1 output.mp4


  


  But some of the image gets stretched with that, and the original aspect ratio is not preserved.

  


  On the Raspberry Pi I can get the effect I want with the following :

  


  ffmpeg -i input.mp4 -b:v 2M -vf scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:'(ow-iw)/2':'(oh-ih)/2',setsar=1 -vcodec h264_v4l2m2m -num_capture_buffers 128 output.mp4


  


  But when I try to use the force_original_aspect_ratio and pad options with the vaapi codec, I get the following error :

  


  ffmpeg -hwaccel vaapi -hwaccel_output_format vaapi -vaapi_device /dev/dri/renderD128 -i input.mp4 -codec:v h264_vaapi -vf scale_vaapi=w=1280:h=720,pad=1280:720:'(ow-iw)/2':'(oh-ih)/2',setsar=1:1 output.mp4

Impossible to convert between the formats supported by the filter 'Parsed_scale_vaapi_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


  


  Is there another option I should use to get the padding and keep the original aspect ratio ?

  


• Trouble with ffmpeg_movie_from_frames in MoviePy - TypeError

  19 octobre 2023, par user22731523

  I'm encountering an issue when using the ffmpeg_movie_from_frames function in MoviePy. Here's my code :

  


  from moviepy.video.io.ffmpeg_tools import ffmpeg_movie_from_frames

input_folder = r"C:\Users\lenovo\Desktop\dist\images"
output_file = r"C:\Users\lenovo\Desktop\dist\v.mp4"
fps = 60.0

ffmpeg_movie_from_frames(output_file, input_folder, fps)


  


  I'm getting a "TypeError : %d format : a real number is required, not str" error. How can I resolve this and successfully create a video from a series of images with the correct frame rate ?

  


  Any help would be greatly appreciated. Thank you !

  


• Restream RTSP stream and Record to files

  12 mai 2017, par Aly2000

  Currently I digest a series of RTSP streams from IP cameras and transcode them to multiple output formats (MPEG DASH, HLS, RTSP) on AWS cloud using Wowza Streaming Engine. However, for the majority of these streams, the only required output is RTSP. I have to record these streams, while also re-streaming them through AWS due to limited bandwidth on the source network. I am trying to replace Wowza for the streams that only require RTSP to reduce costs. However, i cannot seem to find a suitable open source tool that will allow me to re-stream the RTSP stream (as RTSP) and in parallel record to chunked mp4 files (i.e every 10 minutes). I have tried ffmpeg & ffserver, but it seems like i cannot do both (re-stream and record) the RTSP streams.