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• vp9 : drop support for real (non-emulated) edges

  20 décembre 2013, par Anton Khirnov

  vp9 : drop support for real (non-emulated) edges
  They are not measurably faster on x86, they might be somewhat faster on
  
  other platforms due to missing emu edge SIMD, but the gain is not large
  
  enough to justify the added complexity.
  

  • [DH] libavcodec/vp9block.c
  • [DH] tests/fate/vpx.mak

• Opencv VideoCapture not streaming RTSP link and returns "no frame !"

  6 septembre 2023, par Asadullah Naeem

  I am trying to stream my HikVision IP camera throough python. I am using cv2.VideoCapture("rtsp_link") which works fine on my Laptop but when I try to run the same python script with same Opencv and FFmpeg version it gives me following error :

  


  Error :

  


  [h264 @ 000002124c7f9a40] missing picture in access unit with size 47
[h264 @ 000002124c7f9a40] no frame!


  


  I have so far tried to run this script on 5 computer devices but it gives the same error. I am using the following python script and my Opencv version is 4.6.0.66 and ffmpeg version 2022-06-20-git-56419428a8-essentials_build-www.gyan.dev :

  


  Python Script :

  


  import cv2

# RTSP stream URL
rtsp_url = "rtsp://username:password@ip_address:port/Streaming/Channels/501"

# Open the RTSP stream
cap = cv2.VideoCapture(rtsp_url)

# Check if the stream was successfully opened
if not cap.isOpened():
    print("Failed to open RTSP stream.")
    exit()

# Read and display frames from the stream
while True:
    # Read a frame from the stream
    ret, frame = cap.read()

    # Check if the frame was successfully read
    if not ret:
        print("Failed to read frame from RTSP stream.")
        break

    # Display the frame
    cv2.imshow("RTSP Stream", frame)

    # Exit if 'q' is pressed
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# Release the resources
cap.release()
cv2.destroyAllWindows()



  


  Update :

  


  Code runs on a laptop on both wifi and mobile internet (4G) but on other devices rtsp link is accessible only with mobile internet (4G).

  


• FFmpeg - invalid argument on a creation of MP4 with .SRT - "Unable to parse option value "Link_to_the.srt" as image size...?

  20 mai 2023, par sKunZel

  I'm stuck for 2 weeks on same problem on developping a command that bring together a .mp4 file consisting on a fixed image & audio from a .mp3 and then burnt-in subtitle from a stylized .srt into a new MP4.

  


  Here is my command :
 command = f"""ffmpeg -report -i "input_video_arg_abs" -vf "subtitles='input_srt_arg_abs':original_size=816x1456:force_style='FontName=Open Sans Italic,FontSize=13,MarginR=10,MarginV=149'" -c:v libx264 -crf 18 -c:a copy -movflags +faststart "output_video" """

  


  And you can see here the main script definitions of variables and call to fonction :

  


  


  input_srt = os.path.normpath(os.path.join(input_directory, srt_file))
print(f"Chemin du fichier SRT : input_srt")
reformat_srt(input_srt)
final_video_output=os.path.normpath(os.path.join(output_directory,
os.path.splitext(mp3_file)[0] + '.mp4'))
time.sleep(0.5)
create_final_video(temp_video_output, input_srt, final_video_output)

  


  


  This code generated an output file correctly named but 0 Ko. Every log i found indicated an error in the way of my .srt but when i print my input_srt it is correct.

  


  Here i add up some logs :

  


  [h264 @ 000002806874c340] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
[Parsed_subtitles_0 @ 0000028068d97d00] Setting 'filename' to value 'E'
[Parsed_subtitles_0 @ 0000028068d97d00] Setting 'original_size' to value 'YouTubeMcKennaWe_Plants_Are_Happy_PlantsSRTSans_programmation_paralleleinputTerence_McKenna_The_Good_the_True_and_the_Beautiful.srt'
[subtitles @ 0000028068f0de40] Unable to parse option value "YouTubeMcKennaWe_Plants_Are_Happy_PlantsSRTSans_programmation_paralleleinputTerence_McKenna_The_Good_the_True_and_the_Beautiful.srt" as image size
[Parsed_subtitles_0 @ 0000028068d97d00] Setting 'original_size' to value '816x1456'
[Parsed_subtitles_0 @ 0000028068d97d00] Setting 'force_style' to value 'FontName=Open Sans Italic,FontSize=13,MarginR=10,MarginV=149'
[Parsed_subtitles_0 @ 0000028068d97d00] Raster: FreeType 2.10.2
[Parsed_subtitles_0 @ 0000028068d97d00] Shaper: FriBidi 1.0.9 (SIMPLE)
[Parsed_subtitles_0 @ 0000028068d97d00] Initialized
[NULL @ 0000028068f0f480] Opening 'E' for reading
[file @ 000002806bf2b800] Setting default whitelist 'file,crypto'
[Parsed_subtitles_0 @ 0000028068d97d00] Unable to open E
[AVFilterGraph @ 0000028069044cc0] Error initializing filter 'subtitles' with args 'E:\YouTube\McKenna\We_Plants_Are_Happy_Plants\SRT\Sans_programmation_parallele\input\Terence_McKenna_The_Good_the_True_and_the_Beautiful.srt:original_size=816x1456:force_style=FontName=Open Sans Italic,FontSize=13,MarginR=10,MarginV=149'
Error reinitializing filters!
Failed to inject frame into filter network: No such file or directory
Error while processing the decoded data for stream #0:0
[AVIOContext @ 0000028068bbab80] Statistics: 0 seeks, 0 writeouts
[AVIOContext @ 0000028068693640] Statistics: 1370703 bytes read, 0 seeks
Conversion failed!


  


  I'm thinking of "E :" as the problem since on Windows it should be correct but with FFMPEG langage, i don't know...

  


  I wish anyone can help me, and will be glad if it is a tricky solution. Else, sorry for my newbism...
Thanks
sKunZel