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• Python ffmpeg https

  30 novembre 2022, par mor15Euro

  I want to download a streaming video from a website using python and ffmpeg. I can download this video using the ffmpeg command in my shell but as soon as I try to use python ffmpeg i get this error :

  


  https protocol not found, recompile FFmpeg with openssl, gnutls or securetransport enabled.


  


  Using this code :

  


  ffmpeg.input(url).output("demo.mp4", vcodec="copy", acodec="copy").overwrite_output().run()


  


  How can I enable https support for python ffmpeg

  


  If you need more information, let me know

  


  Thank you in advance

  


• Why Yuv data readed from ffmpeg is different from original input yuv ?

  13 mai 2021, par sianyi Huang

  I use ffmpeg to make HDR test video, my approach is write a image, converting the image to yuv420p and then use ffmpeg to make the HDR test video.

  



  But I found the yuv data readed from mp4 is different from the original input..
I was stucked in here for a while, does anyone know how to read the correct yuv data from mp4 ?

  



  #ffmpeg encode command
ffmpeg_encode_mp4 = \
"ffmpeg -y -s 100*100 -pix_fmt yuv420p -threads 4 -r 1 -stream_loop -1 -f rawvideo -i write_yuv.yuv -vf \
scale=out_h_chr_pos=0:out_v_chr_pos=0,format=yuv420p10le \
-c:v libx265 -tag:v hvc1 -t 10 -pix_fmt yuv420p10le -preset medium -x265-params \
crf=12:colorprim=bt2020:transfer=smpte2084:colormatrix=bt2020nc:master-display=\"G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(10000000,1)\":max-cll=\"1000,400\" \
-an test.mp4"

#ffmpeg read yuv from mp4 command
ffmpeg_extract_yuv = "ffmpeg -i test.mp4 -vframes 1 -c:v rawvideo -pix_fmt yuv420p read_yuv.yuv"


#make 100*100 yuv raw
w, h = 100, 100
test_gray = 255
test = np.full((100, 100, 3), test_gray, dtype=np.uint8)
yuv_cv = cv.cvtColor(test, cv.COLOR_RGB2YUV_I420)
yuv_cv.tofile("write_yuv.yuv")

#encode yuv raw to mp4 with HDR metadata
print(ffmpeg_encode_mp4)
result = subprocess.check_output(ffmpeg_encode_mp4, shell = True)
print(result)
sleep(0.5)

#extract yuv from mp4
kill_existing_file("read_yuv.yuv")
print(ffmpeg_extract_yuv)
result = subprocess.check_output(ffmpeg_extract_yuv, shell = True)
print(result)
sleep(0.5)

write_yuv = np.fromfile("write_yuv.yuv",dtype='uint8')
read_yuv = np.fromfile("read_yuv.yuv",dtype='uint8')

print("input gray:", test_gray)
print("write_yuv", write_yuv[:10])
print("read_yuv", read_yuv[:10])

reader = imageio.get_reader("test.mp4")
img = reader.get_data(0)
print("imgeio read:", img[50, 50])

'''
ouput result:
input gray: 255
write_yuv [235 235 235 235 235 235 235 235 235 235]
read_yuv [234 235 234 235 234 235 234 235 234 235]
imgeio read: [253 253 253]
'''


  



  I have no idea how to validate the video I made is corret
Any feedback will be very appreciated !

  


• ffmpeg is reading SDP from RTSP stream but unable to save a screenshot. is it network or utility issue ?

  8 juillet 2017, par Paul Serikov

  My task is to get a screenshot from IP camera rtsp stream via ffmpeg.
  I got following error when I’m trying to do that on DigitalOcean droplet :

  root@docker-512mb-fra1-01:~# ffmpeg -hide_banner -loglevel debug -i rtsp://10.132.193.9//ch0.h264 -f image2 latest.jpg
  
  Splitting the commandline.
  
  Reading option '-hide_banner' ... matched as option 'hide_banner' (do not show program banner) with argument '1'.
  
  Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
  
  Reading option '-i' ... matched as input url with argument 'rtsp://10.132.193.9//ch0.h264'.
  
  Reading option '-f' ... matched as option 'f' (force format) with argument 'image2'.
  
  Reading option 'latest.jpg' ... matched as output url.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option hide_banner (do not show program banner) with argument 1.
  
  Applying option loglevel (set logging level) with argument debug.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input url rtsp://10.132.193.9//ch0.h264.
  
  Successfully parsed a group of options.
  
  Opening an input file: rtsp://10.132.193.9//ch0.h264.
  
  [rtsp @ 0x1298440] SDP:
  
  v=0
  
  o=- 1499314217993040 1 IN IP4 192.168.1.128
  
  s=H.264 Program Stream, streamed by the LIVE555 Media Server
  
  i=ch0.h264
  
  t=0 0
  
  a=DevVer:pusher2
  
  a=GroupName:IPCAM
  
  a=NickName:CIF
  
  a=CfgSection:PROG_CHN0
  
  a=tool:LIVE555 Streaming Media v2011.08.13
  
  a=type:broadcast
  
  a=control:*
  
  a=range:npt=0-
  
  a=x-qt-text-nam:H.264 Program Stream, streamed by the LIVE555 Media Server
  
  a=x-qt-text-inf:ch0.h264
  
  m=video 0 RTP/AVP 96
  
  c=IN IP4 0.0.0.0
  
  b=AS:4000
  
  a=rtpmap:96 H264/90000
  
  a=control:trackID=1
  
  a=fmtp:96 packetization-mode=1;profile-level-id=64001F;sprop-parameter-sets=Z2QAH6wrUCgC3IA=,aO48MA==
  
  a=framesize:96 1280-720
  
  a=cliprect:0,0,1280,720
  
  m=audio 0 RTP/AVP 97
  
  a=rtpmap:97 mpeg4-generic/8000/2
  
  a=fmtp:97 streamtype=5;profile-level-id=1;cpresent=0;mode=AAC-hbr;sizelength=13;indexlength=3;indexdeltalength=3;config=1590
  
  a=control:trackID=2
  
  
  
  Failed to parse interval end specification ''
  
  [rtsp @ 0x1298440] video codec set to: h264
  
  [rtsp @ 0x1298440] RTP Packetization Mode: 1
  
  [rtsp @ 0x1298440] RTP Profile IDC: 64 Profile IOP: 0 Level: 1f
  
  [rtsp @ 0x1298440] Extradata set to 0x1298a20 (size: 23)
  
  [rtsp @ 0x1298440] audio codec set to: aac
  
  [rtsp @ 0x1298440] audio samplerate set to: 8000
  
  [rtsp @ 0x1298440] audio channels set to: 2
  
  [udp @ 0x129e7e0] end receive buffer size reported is 131072
  
  [udp @ 0x129e680] end receive buffer size reported is 131072
  
  [udp @ 0x12bf380] end receive buffer size reported is 131072
  
  [udp @ 0x12bf1c0] end receive buffer size reported is 131072
  
  [rtsp @ 0x1298440] hello state=0
  
  [rtsp @ 0x1298440] UDP timeout, retrying with TCP
  
  [rtsp @ 0x1298440] hello state=0
  
  [rtsp @ 0x1298440] Could not find codec parameters for stream 0 (Video: h264, 1 reference frame, none(left), 1280x720, 1/180000): unspecified pixel format
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, rtsp, from 'rtsp://10.132.193.9//ch0.h264':
  
    Metadata:
  
      title           : H.264 Program Stream, streamed by the LIVE555 Media Server
  
      comment         : ch0.h264
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0, 0, 1/90000: Video: h264, 1 reference frame, none(left), 1280x720, 1/180000, 90k tbr, 90k tbn, 180k tbc
  
      Stream #0:1, 0, 1/8000: Audio: aac, 8000 Hz, stereo, fltp
  
  Successfully opened the file.
  
  Parsing a group of options: output url latest.jpg.
  
  Applying option f (force format) with argument image2.
  
  Successfully parsed a group of options.
  
  Opening an output file: latest.jpg.
  
  Successfully opened the file.
  
  detected 1 logical cores
  
  [graph 0 input from stream 0:0 @ 0x1298280] Setting 'video_size' to value '1280x720'
  
  [graph 0 input from stream 0:0 @ 0x1298280] Setting 'pix_fmt' to value '-1'
  
  [buffer @ 0x12f9680] Unable to parse option value "-1" as pixel format
  
  [graph 0 input from stream 0:0 @ 0x1298280] Setting 'time_base' to value '1/90000'
  
  [graph 0 input from stream 0:0 @ 0x1298280] Setting 'pixel_aspect' to value '0/1'
  
  [graph 0 input from stream 0:0 @ 0x1298280] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 0:0 @ 0x1298280] Setting 'frame_rate' to value '180000/2'
  
  [buffer @ 0x12f9680] Unable to parse option value "-1" as pixel format
  
  [buffer @ 0x12f9680] Error setting option pix_fmt to value -1.
  
  [graph 0 input from stream 0:0 @ 0x1298280] Error applying options to the filter.
  
  Error opening filters!
  
  Exiting normally, received signal 2.

  As you see, ffmpeg is able to read SDP metadata, but for some reason is unable to save a screenshot

  Also same command works fine on my laptop with same VPN configuration !

  Just in case, IP camera doesn’t have a public IP address and accessible via VPN.

  What could be wrong and how to debug ?

  I tried to increase -analyzeduration and -probesize options from default 5s to 30s, but it doesn’t work.