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• How fix FFMPEG No decoder surfaces left error [closed]

  14 juillet 2021, par R.A.M

  
Anybody know how could i fix this problem ?
  


  [h264 @ 0x56086cab3340] No decoder surfaces left
Error while decoding stream #0:0: Invalid data found when processing input0
Impossible to convert between the formats supported by the filter 
'Parsed_scale_npp_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
[aac @ 0x56086bd86fc0] Qavg: 680.716
[aac @ 0x56086bd86fc0] 2 frames left in the queue on closing
[aac @ 0x56086bd88c40] Qavg: 680.716
[aac @ 0x56086bd88c40] 2 frames left in the queue on closing


  


  Let me explain more about my problem :
  
When i transcoding a video on GPU use CUDA, get this error on some movies (not all my video)
  
It works currectly on many videos but has exception in some video like this.
  
When i use Cpu for transcoding this type of video(that has problem) it works and not have any exception and errors.
  
In fact i think problem is on CUDA.
  
The FFMPEG command that i use, is :
  

  


  ffmpeg -y -loglevel info -hwaccel cuda -hwaccel_output_format cuda -hwaccel_device 0 
-i MY_VIDEO.mp4 -vf scale_npp=w=1280:h=720 -c:v h264_nvenc -profile:v main -b:v 
1500000 -sc_threshold 0 -g 25 -keyint_min 25 -bf 2 -c:a aac -b:a 128000 -ar 48000 - 
hls_segment_filename f-4-seg-%d.ts f-4.m3u8


  


  Thanks

  


• example C / C ++ example for hardware video decoding [on hold]

  4 janvier 2017, par user232863

  im using default

      h->c = avcodec_find_decoder(AV_CODEC_ID_H264);
  
      h->ctx = avcodec_alloc_context3(h->c);

  I do not understand how to use the hardware decoding ?

  I do not have a problem with decoding software video x264 or any i problem decode video I frame cuda or any HW method no worked sample found any sample use encode not decode method nvdec or cuda

• Is there an efficient way to use ffmpeg to create a huge quantity of small video file, cut from a larger one ?

  9 mars 2024, par Giuliano Oliveri

  I'm trying to cut video files into smaller chunks. (each one being one word said in the video, so they're not all of equal size)

  


  I've tried a lot of different approaches to try to be as efficient as possible, but I can't get the runtime to be under 2/3rd of the original video length. That's an issue because I'm trying to process 400+ hours of video.

  


  Is there a more efficient way to do this ? Or am I doomed to run this for weeks ?

  


  Here is the command for my best attempt so far

  


  ffmpeg -hwaccel cuda -hwaccel_output_format cuda -ss start_timestamp -t to_timestamp -i file_name -vf "fps=30,scale_cuda=1280:720" -c:v h264_nvenc -y output_file


  


  Note that the machine running the code has a 4090
This command is then executed via python, which gives it the right timestamps and file paths for each smaller clip in a for loop

  


  I think it's wasting a lot of time calling a new process each time, however I haven't been able to get better results with a split filter ; but here's the ffmpeg-python code for that attempt :

  


  Creation of the stream :

  


  inp = (
    ffmpeg
    .input(file_name, hwaccel="cuda", hwaccel_output_format="cuda")
    .filter("fps",fps=30)
    .filter('scale_cuda', '1280','720')
    .filter_multi_output('split')
)


  


  Which then gets called in a for loop

  


  (
    ffmpeg
    .filter(inp, 'trim', start=row[1]['start'], end=row[1]['end'])
    .filter('setpts', 'PTS-STARTPTS')
    .output(output_file,vcodec='h264_nvenc')
    .run()
)