Recherche avancée

Sur d’autres sites (11637)

• Trouble trimming video by frame number with ffmpeg

  8 décembre 2023, par jgore200377

  I want to trim/split a video with ffmpeg using frames. The reason why is because I am using a Shot Transition Detection model which returns a probability of transition for every frame in the video.

  


  Using timestamps to cut the video has yielded bad results as the precision is not 100%.

  


  Ive tried this command which just outputs the entire video which is DEFINITELY not what I want

  


  ffmpeg -i video.mp4 -vf "trim=start_frame=100:end_frame=200,setpts=PTS-STARTPTS" -c:a copy output.mp4


  


  Ive also tried using python bindings with ffmpeg-python

  


  import ffmpeg

input_file = ffmpeg.input('video.mp4')
output_file = ffmpeg.output(input_file.trim(start_frame=1300, end_frame=1500), 'test_output.mp4')
ffmpeg.run(output_file)


  


  This doesnt work either and outputs a video with half of it being still with unpredictable length

  


  ---

  


  Ive visited some other sites but none seem to have this nailed down and it would be much appreciated if someone can answer how to use frames to trim/split a video with ffmpeg.

  


• FFMpegm. Unable to get video stream from a onvif camera

  15 avril 2018, par Denis Gottardello

  I have implemented ffmpeg in my own application to watch live video from video cameras.
  I have tested my application with 2 models of onvif camera and the application works perfectly.
  The customer has got another model of video cameram still onvif h264 but I can’t watch the live stream.
  I can wath it using vlc but when I try to watch it with my application I obtain the following error :

  Input #0, rtsp, from 'rtsp://admin:admin@172.30.153.33:554/1':
  
    Metadata:
  
      title           : h264.mp4
  
    Duration: N/A, bitrate: 64 kb/s
  
      Stream #0:0: Video: h264, none, 90k tbr, 90k tbn, 180k tbc
  
      Stream #0:1: Audio: pcm_mulaw, 8000 Hz, 1 channels, s16, 64 kb/s
  
  [rtsp @ 0x7f86b8004e00] UDP timeout, retrying with TCP
  
  [rtsp @ 0x7f86b8004e00] method PAUSE failed: 455 Method Not Valid In This State
  
  [rtsp @ 0x7f86b8005000] Could not find codec parameters for stream 0 (Video: h264, none): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options

  I have already tried to modify analyzeduration and probesize without any good result.

  How to resolve this error ?
  Could it be caused by a not up-to-date h264 library ?

• Cannot find a proper format for codec ‘h264’ (id 28), pixel format ‘none’

  20 avril 2022, par 이중범

  I downloaded jocover’s git hub ffmpeg and compiled it to stream the video to the web on the Jetsonano board
However, i tried

  


  ffmpeg -c:vh264_nvmpi -i /dev/video -f null -


  


  


  Cannot find a proper format for codec ‘h264’ (id 28), pixel format
‘none’ (id-1)

  


  Assertion *codec_id != AV_CODEC_ID_NONE failed at
src/libavdevice/v4l2.c:811

  


  


  I got this error

  


  and I tried ./ffmpeg -encoders |grep 264

  


  As a result of this console, the output is as follows :

  


  


  v… h264_nvmpi nvmpi H.264 encoder wrapper (codec h264)

  


  


  


  v… h264_v4l2m2m V4L2 mem2mem H.264 encoder wrapper (codec h264)

  


  


  


  v… h264_vaapi H.264/AVC (VAAPI) (codec h264)

  


  


  The camera specs are like this maybe Sony IMX219, a model called Raspberry Pi Camera Module V2

  


  


  ioctl : VIDIOC_ENUM_FMT

  


  Index : 0

  


  Type : Video Capture

  


  Pixel Format : ‘RG10’

  


  Name : 10-bit Bayer RGRG/GBGB

  


  


  I’d really appreciate your help

  


  thx