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• NumPy array of a video changes from the original after writing into the same video

  29 mars 2021, par Rashiq

  I have a video (test.mkv) that I have converted into a 4D NumPy array - (frame, height, width, color_channel). I have even managed to convert that array back into the same video (test_2.mkv) without altering anything. However, after reading this new, test_2.mkv, back into a new NumPy array, the array of the first video is different from the second video's array i.e. their hashes don't match and the numpy.array_equal() function returns false. I have tried using both python-ffmpeg and scikit-video but cannot get the arrays to match.

  


  Python-ffmpeg attempt :

  


  import ffmpeg
import numpy as np
import hashlib

file_name = 'test.mkv'

# Get video dimensions and framerate
probe = ffmpeg.probe(file_name)
video_stream = next((stream for stream in probe['streams'] if stream['codec_type'] == 'video'), None)
width = int(video_stream['width'])
height = int(video_stream['height'])
frame_rate = video_stream['avg_frame_rate']

# Read video into buffer
out, error = (
    ffmpeg
        .input(file_name, threads=120)
        .output("pipe:", format='rawvideo', pix_fmt='rgb24')
        .run(capture_stdout=True)
)

# Convert video buffer to array
video = (
    np
        .frombuffer(out, np.uint8)
        .reshape([-1, height, width, 3])
)

# Convert array to buffer
video_buffer = (
    np.ndarray
        .flatten(video)
        .tobytes()
)

# Write buffer back into a video
process = (
    ffmpeg
        .input('pipe:', format='rawvideo', s='{}x{}'.format(width, height))
        .output("test_2.mkv", r=frame_rate)
        .overwrite_output()
        .run_async(pipe_stdin=True)
)
process.communicate(input=video_buffer)

# Read the newly written video
out_2, error = (
    ffmpeg
        .input("test_2.mkv", threads=40)
        .output("pipe:", format='rawvideo', pix_fmt='rgb24')
        .run(capture_stdout=True)
)

# Convert new video into array
video_2 = (
    np
        .frombuffer(out_2, np.uint8)
        .reshape([-1, height, width, 3])
)

# Video dimesions change
print(f'{video.shape} vs {video_2.shape}') # (844, 1080, 608, 3) vs (2025, 1080, 608, 3)
print(f'{np.array_equal(video, video_2)}') # False

# Hashes don't match
print(hashlib.sha256(bytes(video_2)).digest()) # b'\x88\x00\xc8\x0ed\x84!\x01\x9e\x08 \xd0U\x9a(\x02\x0b-\xeeA\xecU\xf7\xad0xa\x9e\\\xbck\xc3'
print(hashlib.sha256(bytes(video)).digest()) # b'\x9d\xc1\x07xh\x1b\x04I\xed\x906\xe57\xba\xf3\xf1k\x08\xfa\xf1\xfaM\x9a\xcf\xa9\t8\xf0\xc9\t\xa9\xb7'


  


  Scikit-video attempt :

  


  import skvideo.io as sk
import numpy as np

video_data = sk.vread('test.mkv')

sk.vwrite('test_2_ski.mkv', video_data)

video_data_2 = sk.vread('test_2_ski.mkv')

# Dimensions match but...
print(video_data.shape) # (844, 1080, 608, 3)
print(video_data_2.shape) # (844, 1080, 608, 3)

# ...array elements don't
print(np.array_equal(video_data, video_data_2)) # False

# Hashes don't match either
print(hashlib.sha256(bytes(video_2)).digest()) # b'\x8b?]\x8epD:\xd9B\x14\xc7\xba\xect\x15G\xfaRP\xde\xad&EC\x15\xc3\x07\n{a[\x80'
print(hashlib.sha256(bytes(video)).digest()) # b'\x9d\xc1\x07xh\x1b\x04I\xed\x906\xe57\xba\xf3\xf1k\x08\xfa\xf1\xfaM\x9a\xcf\xa9\t8\xf0\xc9\t\xa9\xb7'


  


  I don't understand where I'm going wrong and both the respective documentations do not highlight how to do this particular task. Any help is appreciated. Thank you.

  


• Multicast video stream from Dahua IP surveillance camera - ffmpeg etc [closed]

  23 mai, par Jaroslav Mazurak

  I have a Dahua IP surveillance camera and want to get the video via a multicast stream.

  


  In the camera settings, I enabled Multicast streaming, IP 239.240.1.2, and port 40000 (the default). The RTSP port is 554 (the default).

  


  Neither VLC 3.0.21 nor ffmpeg 7.1.1 work when I try to use multicast. Both of them work when I use a unicast. OS is Windows 11 x64. Both applications are allowed in the Windows firewall (any protocol, all networks ; same result if the firewall is disabled completely). I have Wireshark installed, and I see that when a client requests the stream via RTSP, the multicast traffic from the camera is present ; ffmpeg determines the stream but doesn't capture any video, and the output file is empty (it contains only the header and no video). When I use unicast, the correct output video file is saved.

  


  I have no idea what I'm doing wrong, and why ffmpeg (and VLC) doesn't capture anything in the multicast mode.

  


  Here are the ffmpeg logs for multicast and unicast modes.

  


  Multicast :

  


  ffmpeg -fflags nobuffer -flags low_delay -timeout 10M -stats -rtsp_transport udp_multicast -i "rtsp://user:password@10.10.10.10:554/cam/realmonitor?channel=1&subtype=0&unicast=false" -acodec copy -vcodec copy -y output.mkv

ffmpeg version 7.1.1-full_build-www.gyan.dev Copyright (c) 2000-2025 the FFmpeg developers
  built with gcc 14.2.0 (Rev1, Built by MSYS2 projffmpeg -fflags nobuffer -flags low_delay -timeout 10M -stats -i "rtsp://user:password@10.10.10.10:554/cam/realmonitor?channel=1&subtype=0" -acodec copy -vcodec copy -y output.mkv

ffmpeg version 7.1.1-full_build-www.gyan.dev Copyright (c) 2000-2025 the FFmpeg developers
  built with gcc 14.2.0 (Rev1, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-lcms2 --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libquirc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable-libvvenc --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.100 / 61.  7.100
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  4.100 / 10.  4.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
Input #0, rtsp, from 'rtsp://user:password@10.10.10.10:554/cam/realmonitor?channel=1&subtype=0':
  Metadata:
    title           : Media Server
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 2560x1440, 25 fps, 25 tbr, 90k tbn
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Output #0, matroska, to 'output.mkv':
  Metadata:
    title           : Media Server
    encoder         : Lavf61.7.100
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 2560x1440, q=2-31, 25 fps, 25 tbr, 1k tbn
Press [q] to stop, [?] for help
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=00:00:01.32 bitrate=   0.0kbits/s speed= 2.6x    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=00:00:01.84 bitrate=   0.0kbits/s speed=1.81x    
frame=   10 fps=6.5 q=-1.0 size=       1KiB time=00:00:02.36 bitrate=   2.2kbits/s speed=1.53x    
frame=   23 fps= 11 q=-1.0 size=       1KiB time=00:00:02.88 bitrate=   1.8kbits/s speed= 1.4x    
frame=   36 fps= 14 q=-1.0 size=       1KiB time=00:00:03.40 bitrate=   1.5kbits/s speed=1.33x    
frame=   49 fps= 16 q=-1.0 size=       1KiB time=00:00:03.92 bitrate=   1.3kbits/s speed=1.27x    
frame=   62 fps= 17 q=-1.0 size=     256KiB time=00:00:04.44 bitrate= 472.3kbits/s speed=1.23x    
frame=   75 fps= 18 q=-1.0 size=     256KiB time=00:00:04.96 bitrate= 422.8kbits/s speed= 1.2x    
frame=   88 fps= 19 q=-1.0 size=     256KiB time=00:00:05.48 bitrate= 382.7kbits/s speed=1.18x    
frame=  100 fps= 19 q=-1.0 size=     256KiB time=00:00:05.96 bitrate= 351.9kbits/s speed=1.16x    
frame=  113 fps= 20 q=-1.0 size=     768KiB time=00:00:06.48 bitrate= 970.9kbits/s speed=1.14x    
frame=  126 fps= 20 q=-1.0 size=     768KiB time=00:00:07.00 bitrate= 898.8kbits/s speed=1.13x    
frame=  139 fps= 21 q=-1.0 size=     768KiB time=00:00:07.52 bitrate= 836.6kbits/s speed=1.12x    
frame=  152 fps= 21 q=-1.0 size=    1280KiB time=00:00:08.04 bitrate=1304.2kbits/s speed=1.11x    
frame=  165 fps= 21 q=-1.0 size=    1280KiB time=00:00:08.56 bitrate=1225.0kbits/s speed=1.11x    
frame=  178 fps= 22 q=-1.0 size=    1280KiB time=00:00:09.08 bitrate=1154.8kbits/s speed= 1.1x    
frame=  191 fps= 22 q=-1.0 size=    1280KiB time=00:00:09.60 bitrate=1092.3kbits/s speed= 1.1x    
frame=  203 fps= 22 q=-1.0 size=    1792KiB time=00:00:10.08 bitrate=1456.4kbits/s speed=1.09x    
frame=  217 fps= 22 q=-1.0 size=    1792KiB time=00:00:10.64 bitrate=1379.7kbits/s speed=1.09x    


[q] command received. Exiting.

[out#0/matroska @ 000001e0329cad80] video:2377KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 0.100389%
frame=  230 fps= 22 q=-1.0 Lsize=    2380KiB time=00:00:11.16 bitrate=1746.9kbits/s speed=1.08x    
ect)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-lcms2 --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libquirc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable-libvvenc --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.100 / 61.  7.100
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  4.100 / 10.  4.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
Input #0, rtsp, from 'rtsp://user:password@10.10.10.10:554/cam/realmonitor?channel=1&subtype=0&unicast=false':
  Metadata:
    title           : Media Server
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 2560x1440, 25 tbr, 90k tbn
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Output #0, matroska, to 'output.mkv':
  Metadata:
    title           : Media Server
    encoder         : Lavf61.7.100
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 2560x1440, q=2-31, 25 tbr, 1k tbn
Press [q] to stop, [?] for help
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=N/A bitrate=N/A speed=N/A    
[in#0/rtsp @ 0000014b1a80a580] Error during demuxing: Error number -138 occurred
[out#0/matroska @ 0000014b1a7ee700] video:0KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown
[out#0/matroska @ 0000014b1a7ee700] Output file is empty, nothing was encoded
frame=    0 fps=0.0 q=-1.0 Lsize=       1KiB time=N/A bitrate=N/A speed=N/A    


  


  Unicast :

  


  ffmpeg -fflags nobuffer -flags low_delay -timeout 10M -stats -i "rtsp://user:password@10.10.10.10:554/cam/realmonitor?channel=1&subtype=0" -acodec copy -vcodec copy -y output.mkv

ffmpeg version 7.1.1-full_build-www.gyan.dev Copyright (c) 2000-2025 the FFmpeg developers
  built with gcc 14.2.0 (Rev1, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-lcms2 --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libquirc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable-libvvenc --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.100 / 61.  7.100
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  4.100 / 10.  4.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
Input #0, rtsp, from 'rtsp://user:password@10.10.10.10:554/cam/realmonitor?channel=1&subtype=0':
  Metadata:
    title           : Media Server
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 2560x1440, 25 fps, 25 tbr, 90k tbn
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Output #0, matroska, to 'output.mkv':
  Metadata:
    title           : Media Server
    encoder         : Lavf61.7.100
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 2560x1440, q=2-31, 25 fps, 25 tbr, 1k tbn
Press [q] to stop, [?] for help
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=00:00:01.32 bitrate=   0.0kbits/s speed= 2.6x    
frame=    0 fps=0.0 q=-1.0 size=       0KiB time=00:00:01.84 bitrate=   0.0kbits/s speed=1.81x    
frame=   10 fps=6.5 q=-1.0 size=       1KiB time=00:00:02.36 bitrate=   2.2kbits/s speed=1.53x    
frame=   23 fps= 11 q=-1.0 size=       1KiB time=00:00:02.88 bitrate=   1.8kbits/s speed= 1.4x    
frame=   36 fps= 14 q=-1.0 size=       1KiB time=00:00:03.40 bitrate=   1.5kbits/s speed=1.33x    
frame=   49 fps= 16 q=-1.0 size=       1KiB time=00:00:03.92 bitrate=   1.3kbits/s speed=1.27x    
frame=   62 fps= 17 q=-1.0 size=     256KiB time=00:00:04.44 bitrate= 472.3kbits/s speed=1.23x    
frame=   75 fps= 18 q=-1.0 size=     256KiB time=00:00:04.96 bitrate= 422.8kbits/s speed= 1.2x    
frame=   88 fps= 19 q=-1.0 size=     256KiB time=00:00:05.48 bitrate= 382.7kbits/s speed=1.18x    
frame=  100 fps= 19 q=-1.0 size=     256KiB time=00:00:05.96 bitrate= 351.9kbits/s speed=1.16x    
frame=  113 fps= 20 q=-1.0 size=     768KiB time=00:00:06.48 bitrate= 970.9kbits/s speed=1.14x    
frame=  126 fps= 20 q=-1.0 size=     768KiB time=00:00:07.00 bitrate= 898.8kbits/s speed=1.13x    
frame=  139 fps= 21 q=-1.0 size=     768KiB time=00:00:07.52 bitrate= 836.6kbits/s speed=1.12x    
frame=  152 fps= 21 q=-1.0 size=    1280KiB time=00:00:08.04 bitrate=1304.2kbits/s speed=1.11x    
frame=  165 fps= 21 q=-1.0 size=    1280KiB time=00:00:08.56 bitrate=1225.0kbits/s speed=1.11x    
frame=  178 fps= 22 q=-1.0 size=    1280KiB time=00:00:09.08 bitrate=1154.8kbits/s speed= 1.1x    
frame=  191 fps= 22 q=-1.0 size=    1280KiB time=00:00:09.60 bitrate=1092.3kbits/s speed= 1.1x    
frame=  203 fps= 22 q=-1.0 size=    1792KiB time=00:00:10.08 bitrate=1456.4kbits/s speed=1.09x    
frame=  217 fps= 22 q=-1.0 size=    1792KiB time=00:00:10.64 bitrate=1379.7kbits/s speed=1.09x    


[q] command received. Exiting.

[out#0/matroska @ 000001e0329cad80] video:2377KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 0.100389%
frame=  230 fps= 22 q=-1.0 Lsize=    2380KiB time=00:00:11.16 bitrate=1746.9kbits/s speed=1.08x    


  


• Use FFmpeg concat two video, is output video level mistake ?

  27 février, par 哇哈哈

  video1
{
    "index": 0,
    "codec_name": "hevc",
    "codec_long_name": "H.265 / HEVC (High Efficiency Video Coding)",
    "profile": "Main",
    "codec_type": "video",
    "codec_tag_string": "hev1",
    "codec_tag": "0x31766568",
    "width": 1920,
    "height": 1080,
    "coded_width": 1920,
    "coded_height": 1080,
    "has_b_frames": 2,
    "sample_aspect_ratio": "1:1",
    "display_aspect_ratio": "16:9",
    "pix_fmt": "yuv420p",
    "level": 120,
    "color_range": "tv",
    "chroma_location": "left",
    "field_order": "progressive",
    "refs": 1,
    "view_ids_available": "",
    "view_pos_available": "",
    "id": "0x1",
    "r_frame_rate": "30/1",
    "avg_frame_rate": "30/1",
    "time_base": "1/15360",
    "start_pts": 0,
    "start_time": "0.000000",
    "duration_ts": 200192,
    "duration": "13.033333",
    "bit_rate": "10794613",
    "nb_frames": "391",
    "extradata_size": 2496,
    "disposition": {
        "default": 1,
        "dub": 0,
        "original": 0,
        "comment": 0,
        "lyrics": 0,
        "karaoke": 0,
        "forced": 0,
        "hearing_impaired": 0,
        "visual_impaired": 0,
        "clean_effects": 0,
        "attached_pic": 0,
        "timed_thumbnails": 0,
        "non_diegetic": 0,
        "captions": 0,
        "descriptions": 0,
        "metadata": 0,
        "dependent": 0,
        "still_image": 0,
        "multilayer": 0
    },
    "tags": {
        "language": "eng",
        "handler_name": "VideoHandler",
        "vendor_id": "[0][0][0][0]",
        "encoder": "Lavc61.33.100 libx265",
        "timecode": "00:00:00;00"
    }
}

video2 
{
    "index": 0,
    "codec_name": "hevc",
    "codec_long_name": "H.265 / HEVC (High Efficiency Video Coding)",
    "profile": "Main",
    "codec_type": "video",
    "codec_tag_string": "hev1",
    "codec_tag": "0x31766568",
    "width": 1920,
    "height": 1080,
    "coded_width": 1920,
    "coded_height": 1080,
    "has_b_frames": 2,
    "sample_aspect_ratio": "1:1",
    "display_aspect_ratio": "16:9",
    "pix_fmt": "yuv420p",
    "level": 120,
    "color_range": "tv",
    "chroma_location": "left",
    "field_order": "progressive",
    "refs": 1,
    "view_ids_available": "",
    "view_pos_available": "",
    "id": "0x1",
    "r_frame_rate": "25/1",
    "avg_frame_rate": "25/1",
    "time_base": "1/12800",
    "start_pts": 0,
    "start_time": "0.000000",
    "duration_ts": 1309696,
    "duration": "102.320000",
    "bit_rate": "1024122",
    "nb_frames": "2558",
    "extradata_size": 2496,
    "disposition": {
        "default": 1,
        "dub": 0,
        "original": 0,
        "comment": 0,
        "lyrics": 0,
        "karaoke": 0,
        "forced": 0,
        "hearing_impaired": 0,
        "visual_impaired": 0,
        "clean_effects": 0,
        "attached_pic": 0,
        "timed_thumbnails": 0,
        "non_diegetic": 0,
        "captions": 0,
        "descriptions": 0,
        "metadata": 0,
        "dependent": 0,
        "still_image": 0,
        "multilayer": 0
    },
    "tags": {
        "language": "und",
        "handler_name": "VideoHandler",
        "vendor_id": "[0][0][0][0]",
        "encoder": "Lavc61.33.100 libx265"
    }
}

out:
{
    "index": 0,
    "codec_name": "hevc",
    "codec_long_name": "H.265 / HEVC (High Efficiency Video Coding)",
    "profile": "Main",
    "codec_type": "video",
    "codec_tag_string": "hev1",
    "codec_tag": "0x31766568",
    "width": 1920,
    "height": 1080,
    "coded_width": 1920,
    "coded_height": 1080,
    "has_b_frames": 2,
    "sample_aspect_ratio": "1:1",
    "display_aspect_ratio": "16:9",
    "pix_fmt": "yuv420p",
    "level": 186,
    "color_range": "tv",
    "chroma_location": "left",
    "field_order": "progressive",
    "refs": 1,
    "view_ids_available": "",
    "view_pos_available": "",
    "id": "0x1",
    "r_frame_rate": "30/1",
    "avg_frame_rate": "147450/5767",
    "time_base": "1/1000000",
    "start_pts": 0,
    "start_time": "0.000000",
    "duration_ts": 115340000,
    "duration": "115.340000",
    "bit_rate": "1060604",
    "nb_frames": "2949",
    "extradata_size": 2500,
    "disposition": {
        "default": 1,
        "dub": 0,
        "original": 0,
        "comment": 0,
        "lyrics": 0,
        "karaoke": 0,
        "forced": 0,
        "hearing_impaired": 0,
        "visual_impaired": 0,
        "clean_effects": 0,
        "attached_pic": 0,
        "timed_thumbnails": 0,
        "non_diegetic": 0,
        "captions": 0,
        "descriptions": 0,
        "metadata": 0,
        "dependent": 0,
        "still_image": 0,
        "multilayer": 0
    },
    "tags": {
        "language": "und",
        "handler_name": "VideoHandler",
        "vendor_id": "[0][0][0][0]",
        "encoder": "Lavc61.33.100 libx265"
    }
}


  


  output video level is 6.2 ? i wiki level refer to fps resolusion or bitrate,but not suit this output video.
0。0 ! Could Someone HELP me ?

  


  ffmpeg -i .\HEVC_1080p_30P_yellowtree.mp4 -i .\HEVC_1080p_24fps_happy.mp4 -filter_complex "[0:v][1:v]concat=n=2:v=1:a=0[outv]" -map "[outv]" -c:v libx265 concat_output.mp4

  


  ffmpeg version N-118448-g43be8d0728-20250209 Copyright (c) 2000-2025 the FFmpeg developers
built with gcc 14.2.0 (crosstool-NG 1.26.0.120_4d36f27)
configuration : —prefix=/ffbuild/prefix —pkg-config-flags=—static —pkg-config=pkg-config —cross-prefix=x86_64-w64-mingw32- —arch=x86_64 —target-os=mingw32 —enable-gpl —enable-version3 —disable-debug —enable-shared —disable-static —disable-w32threads —enable-pthreads —enable-iconv —enable-zlib —enable-libfreetype —enable-libfribidi —enable-gmp —enable-libxml2 —enable-lzma —enable-fontconfig —enable-libharfbuzz —enable-libvorbis —enable-opencl —disable-libpulse —enable-libvmaf —disable-libxcb —disable-xlib —enable-amf —enable-libaom —enable-libaribb24 —enable-avisynth —enable-chromaprint —enable-libdav1d —enable-libdavs2 —enable-libdvdread —enable-libdvdnav —disable-libfdk-aac —enable-ffnvcodec —enable-cuda-llvm —enable-frei0r —enable-libgme —enable-libkvazaar —enable-libaribcaption —enable-libass —enable-libbluray —enable-libjxl —enable-libmp3lame —enable-libopus —enable-librist —enable-libssh —enable-libtheora —enable-libvpx —enable-libwebp —enable-libzmq —enable-lv2 —enable-libvpl —enable-openal —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenh264 —enable-libopenjpeg —enable-libopenmpt —enable-librav1e —enable-librubberband —enable-schannel —enable-sdl2 —enable-libsnappy —enable-libsoxr —enable-libsrt —enable-libsvtav1 —enable-libtwolame —enable-libuavs3d —disable-libdrm —enable-vaapi —enable-libvidstab —enable-vulkan —enable-libshaderc —enable-libplacebo —disable-libvvenc —enable-libx264 —enable-libx265 —enable-libxavs2 —enable-libxvid —enable-libzimg —enable-libzvbi —extra-cflags=-DLIBTWOLAME_STATIC —extra-cxxflags= —extra-libs=-lgomp —extra-ldflags=-pthread —extra-ldexeflags= —cc=x86_64-w64-mingw32-gcc —cxx=x86_64-w64-mingw32-g++ —ar=x86_64-w64-mingw32-gcc-ar —ranlib=x86_64-w64-mingw32-gcc-ranlib —nm=x86_64-w64-mingw32-gcc-nm —extra-version=20250209
libavutil 59. 56.100 / 59. 56.100
libavcodec 61. 33.100 / 61. 33.100
libavformat 61. 9.107 / 61. 9.107
libavdevice 61. 4.100 / 61. 4.100
libavfilter 10. 9.100 / 10. 9.100
libswscale 8. 13.100 / 8. 13.100
libswresample 5. 4.100 / 5. 4.100
libpostproc 58. 4.100 / 58. 4.100