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• why it is taking a lot of time to convert image to video in ffmpeg ?

  20 avril 2021, par al pacino

  Below is a snippet of code i am using to convert images into videos but It is taking around 3 minutes to convert image to 5 second video.
If I run the command on Image present on a directory then it converts images to videos very swiftly. but i need to use try except to catch ConnectionError..
can anyone tell what I am doing wrong ?

  


  video = []
video_list = []
for video in videos:
    try:
        r = requests.get(video, stream=True)
        print(r.status_code)
        if not r.status_code == 200:
            message = "broken url process could not be completed"
            return message
        if r.status_code == 200:
            if video.endswith(".jpg") or video.endswith(".png") or video.endswith(".jpeg"):
                filename = str(uuid.uuid4())
                url2 = download_path + filename +".webm"
                #cmd = "ffmpeg -loop 1 -i '{}' -c:v libx264 -t 5 -pix_fmt yuv420p -vf scale={}:{} ".format(video, width, height)+ url2
                cmd = "ffmpeg -loop 1 -i '{}' -t 5 -vf scale={}:{} ".format(video, width, height) + url2
                os.system(cmd)
                path_remover(video)
                video_list.append(url2)
            else:
                video_list.append(video)
    except ConnectionError:
        for i in video_list:
            path_remover(i)
        message = "broken url process could not be completed"
        return message


  


  full log after running the command with online url :

  


  ffmpeg -loop 1 -i 'https://cdn.pixabay.com/photo/2020/10/23/12/03/arch-5678549__340.jpg' -t 5 -vf scale=1280:780 output.mp4 


ffmpeg version n4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix= --prefix=/usr --disable-debug --disable-doc --disable-static --enable-cuda --enable-cuda-sdk --enable-cuvid --enable-libdrm --enable-ffplay --enable-gnutls --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libmp3lame --enable-libnpp --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopus --enable-libpulse --enable-sdl2 --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxvid --enable-nonfree --enable-nvenc --enable-omx --enable-openal --enable-opencl --enable-runtime-cpudetect --enable-shared --enable-vaapi --enable-vdpau --enable-version3 --enable-xlib
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, image2, from 'https://cdn.pixabay.com/photo/2021/04/17/18/26/woman-6186493__340.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 5538 kb/s
    Stream #0:0: Video: mjpeg (Progressive), yuvj420p(pc, bt470bg/unknown/unknown), 511x340 [SAR 1:1 DAR 511:340], 25 fps, 25 tbr, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[swscaler @ 0x5580ac8e7c40] deprecated pixel format used, make sure you did set range correctly
[libx264 @ 0x5580ac186b40] using SAR=1034/1129
[libx264 @ 0x5580ac186b40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
[libx264 @ 0x5580ac186b40] profile High, level 3.2
[libx264 @ 0x5580ac186b40] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuvj420p(pc), 1280x780 [SAR 19929:21760 DAR 511:340], q=-1--1, 25 fps, 12800 tbn, 25 tbc
    Metadata:
      encoder         : Lavc58.91.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame=  100 fps=0.0 q=28.0 size=       0kB time=00:00:01.64 bitrate=   0.2kbits/frame=  125 fps=0.0 q=-1.0 Lsize=      90kB time=00:00:04.88 bitrate= 151.7kbits/s speed=6.79x    
video:88kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.618829%
[libx264 @ 0x5580ac186b40] frame I:1     Avg QP:16.31  size: 75247
[libx264 @ 0x5580ac186b40] frame P:31    Avg QP:16.13  size:   314
[libx264 @ 0x5580ac186b40] frame B:93    Avg QP:31.33  size:    49
[libx264 @ 0x5580ac186b40] consecutive B-frames:  0.8%  0.0%  0.0% 99.2%
[libx264 @ 0x5580ac186b40] mb I  I16..4: 10.6% 77.6% 11.8%
[libx264 @ 0x5580ac186b40] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  2.5%  0.2%  0.2%  0.0%  0.0%    skip:97.2%
[libx264 @ 0x5580ac186b40] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.4%  0.0%  0.0%  direct: 0.0%  skip:99.6%  L0: 8.3% L1:91.7% BI: 0.0%
[libx264 @ 0x5580ac186b40] 8x8 transform intra:77.5% inter:98.7%
[libx264 @ 0x5580ac186b40] coded y,uvDC,uvAC intra: 88.4% 95.3% 79.5% inter: 0.1% 0.5% 0.0%
[libx264 @ 0x5580ac186b40] i16 v,h,dc,p:  2%  3%  0% 95%
[libx264 @ 0x5580ac186b40] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 18%  7%  6% 11% 10% 10%  8%  8%
[libx264 @ 0x5580ac186b40] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 18%  7%  5% 16% 11%  9%  6%  4%
[libx264 @ 0x5580ac186b40] i8c dc,h,v,p: 33% 21% 22% 24%
[libx264 @ 0x5580ac186b40] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x5580ac186b40] ref P L0: 85.7%  0.1% 13.2%  1.0%
[libx264 @ 0x5580ac186b40] ref B L0: 53.6% 46.4%
[libx264 @ 0x5580ac186b40] ref B L1: 92.8%  7.2%
[libx264 @ 0x5580ac186b40] kb/s:143.20
aman@aman:~/Desktop/a$ ffmpeg -loop 1 -i 'https://cdn.pixabay.com/photo/2021/04/17/18/26/woman-6186493__340.jpg' -t 5 -vf scale=1280:780 output.webm
ffmpeg version n4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix= --prefix=/usr --disable-debug --disable-doc --disable-static --enable-cuda --enable-cuda-sdk --enable-cuvid --enable-libdrm --enable-ffplay --enable-gnutls --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libmp3lame --enable-libnpp --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopus --enable-libpulse --enable-sdl2 --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxvid --enable-nonfree --enable-nvenc --enable-omx --enable-openal --enable-opencl --enable-runtime-cpudetect --enable-shared --enable-vaapi --enable-vdpau --enable-version3 --enable-xlib
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, image2, from 'https://cdn.pixabay.com/photo/2021/04/17/18/26/woman-6186493__340.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 5538 kb/s
    Stream #0:0: Video: mjpeg (Progressive), yuvj420p(pc, bt470bg/unknown/unknown), 511x340 [SAR 1:1 DAR 511:340], 25 fps, 25 tbr, 25 tbn, 25 tbc
File 'output.webm' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> vp9 (libvpx-vp9))
Press [q] to stop, [?] for help
[swscaler @ 0x5630553879c0] deprecated pixel format used, make sure you did set range correctly
[libvpx-vp9 @ 0x563054cd2500] v1.7.0
[libvpx-vp9 @ 0x563054cd2500] Neither bitrate nor constrained quality specified, using default CRF of 32
Output #0, webm, to 'output.webm':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: vp9 (libvpx-vp9), yuv420p, 1280x780 [SAR 19929:21760 DAR 511:340], q=-1--1, 25 fps, 1k tbn, 25 tbc
    Metadata:
      encoder         : Lavc58.91.100 libvpx-vp9
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame=   57 fps=0.0 q=0.0 size=       1kB time=00:00:01.28 bitrate=   3.3kbits/sframe=  103 fps=102 q=0.0 size=       1kB time=00:00:03.12 bitrate=   1.3kbits/sframe=  125 fps= 85 q=0.0 Lsize=      51kB time=00:00:04.96 bitrate=  84.0kbits/s speed=3.37x    
video:50kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.571023%


  


• why it is taking a lot of time to convert image via HTTP to video in ffmpeg ?

  20 avril 2021, par al pacino

  Below is the ffmpeg i am using to convert images into videos but It is taking around 3 minutes to convert image to 5 second video.
If I run the command on Image present on a directory then it converts images to videos very swiftly.

  


  can anyone tell what I am doing wrong ?

  


  ffmpeg -loop 1 -i 'https://cdn.pixabay.com/photo/2020/10/23/12/03/arch-5678549__340.jpg' -t 5 -vf scale=1280:780 output.mp4 

ffmpeg version n4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix= --prefix=/usr --disable-debug --disable-doc --disable-static --enable-cuda --enable-cuda-sdk --enable-cuvid --enable-libdrm --enable-ffplay --enable-gnutls --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libmp3lame --enable-libnpp --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopus --enable-libpulse --enable-sdl2 --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxvid --enable-nonfree --enable-nvenc --enable-omx --enable-openal --enable-opencl --enable-runtime-cpudetect --enable-shared --enable-vaapi --enable-vdpau --enable-version3 --enable-xlib
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, image2, from 'https://cdn.pixabay.com/photo/2021/04/17/18/26/woman-6186493__340.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 5538 kb/s
    Stream #0:0: Video: mjpeg (Progressive), yuvj420p(pc, bt470bg/unknown/unknown), 511x340 [SAR 1:1 DAR 511:340], 25 fps, 25 tbr, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[swscaler @ 0x5580ac8e7c40] deprecated pixel format used, make sure you did set range correctly
[libx264 @ 0x5580ac186b40] using SAR=1034/1129
[libx264 @ 0x5580ac186b40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
[libx264 @ 0x5580ac186b40] profile High, level 3.2
[libx264 @ 0x5580ac186b40] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuvj420p(pc), 1280x780 [SAR 19929:21760 DAR 511:340], q=-1--1, 25 fps, 12800 tbn, 25 tbc
    Metadata:
      encoder         : Lavc58.91.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame=  100 fps=0.0 q=28.0 size=       0kB time=00:00:01.64 bitrate=   0.2kbits/frame=  125 fps=0.0 q=-1.0 Lsize=      90kB time=00:00:04.88 bitrate= 151.7kbits/s speed=6.79x    
video:88kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.618829%
[libx264 @ 0x5580ac186b40] frame I:1     Avg QP:16.31  size: 75247
[libx264 @ 0x5580ac186b40] frame P:31    Avg QP:16.13  size:   314
[libx264 @ 0x5580ac186b40] frame B:93    Avg QP:31.33  size:    49
[libx264 @ 0x5580ac186b40] consecutive B-frames:  0.8%  0.0%  0.0% 99.2%
[libx264 @ 0x5580ac186b40] mb I  I16..4: 10.6% 77.6% 11.8%
[libx264 @ 0x5580ac186b40] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  2.5%  0.2%  0.2%  0.0%  0.0%    skip:97.2%
[libx264 @ 0x5580ac186b40] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.4%  0.0%  0.0%  direct: 0.0%  skip:99.6%  L0: 8.3% L1:91.7% BI: 0.0%
[libx264 @ 0x5580ac186b40] 8x8 transform intra:77.5% inter:98.7%
[libx264 @ 0x5580ac186b40] coded y,uvDC,uvAC intra: 88.4% 95.3% 79.5% inter: 0.1% 0.5% 0.0%
[libx264 @ 0x5580ac186b40] i16 v,h,dc,p:  2%  3%  0% 95%
[libx264 @ 0x5580ac186b40] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 18%  7%  6% 11% 10% 10%  8%  8%
[libx264 @ 0x5580ac186b40] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 18%  7%  5% 16% 11%  9%  6%  4%
[libx264 @ 0x5580ac186b40] i8c dc,h,v,p: 33% 21% 22% 24%
[libx264 @ 0x5580ac186b40] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x5580ac186b40] ref P L0: 85.7%  0.1% 13.2%  1.0%
[libx264 @ 0x5580ac186b40] ref B L0: 53.6% 46.4%
[libx264 @ 0x5580ac186b40] ref B L1: 92.8%  7.2%
[libx264 @ 0x5580ac186b40] kb/s:143.20
aman@aman:~/Desktop/a$ ffmpeg -loop 1 -i 'https://cdn.pixabay.com/photo/2021/04/17/18/26/woman-6186493__340.jpg' -t 5 -vf scale=1280:780 output.webm
ffmpeg version n4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix= --prefix=/usr --disable-debug --disable-doc --disable-static --enable-cuda --enable-cuda-sdk --enable-cuvid --enable-libdrm --enable-ffplay --enable-gnutls --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libmp3lame --enable-libnpp --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopus --enable-libpulse --enable-sdl2 --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxvid --enable-nonfree --enable-nvenc --enable-omx --enable-openal --enable-opencl --enable-runtime-cpudetect --enable-shared --enable-vaapi --enable-vdpau --enable-version3 --enable-xlib
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, image2, from 'https://cdn.pixabay.com/photo/2021/04/17/18/26/woman-6186493__340.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 5538 kb/s
    Stream #0:0: Video: mjpeg (Progressive), yuvj420p(pc, bt470bg/unknown/unknown), 511x340 [SAR 1:1 DAR 511:340], 25 fps, 25 tbr, 25 tbn, 25 tbc
File 'output.webm' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> vp9 (libvpx-vp9))
Press [q] to stop, [?] for help
[swscaler @ 0x5630553879c0] deprecated pixel format used, make sure you did set range correctly
[libvpx-vp9 @ 0x563054cd2500] v1.7.0
[libvpx-vp9 @ 0x563054cd2500] Neither bitrate nor constrained quality specified, using default CRF of 32
Output #0, webm, to 'output.webm':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: vp9 (libvpx-vp9), yuv420p, 1280x780 [SAR 19929:21760 DAR 511:340], q=-1--1, 25 fps, 1k tbn, 25 tbc
    Metadata:
      encoder         : Lavc58.91.100 libvpx-vp9
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame=   57 fps=0.0 q=0.0 size=       1kB time=00:00:01.28 bitrate=   3.3kbits/sframe=  103 fps=102 q=0.0 size=       1kB time=00:00:03.12 bitrate=   1.3kbits/sframe=  125 fps= 85 q=0.0 Lsize=      51kB time=00:00:04.96 bitrate=  84.0kbits/s speed=3.37x    
video:50kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.571023%


  


• ffmpeg can't access to usb webcam from python subprocess.Popen in windows

  29 avril 2021, par Tomez

  If I run the following ffmpeg command from windows cmd it works
  

  


  ffmpeg -f dshow -i video="USB Video Device" -s 1280x720 -f rawvideo -pix_fmt rgb24 pipe:


  


  I then tried to execute the same in python
  
Python 3.7.4 (tags/v3.7.4:e09359112e, Jul 8 2019, 20:34:20) [MSC v.1916 64 bit (AMD64)] on win32

  


  args = [
    'ffmpeg', '-f', 'dshow', '-i', 'video=USB Video Device', '-s', '1280x720',
    '-f', 'rawvideo', '-pix_fmt','rgb24', 'pipe:'
]
ffmpeg_proc = subprocess.Popen(args, stdout=subprocess.PIPE)


  


  but I get this error

  


  D:\Projects\Applications\VideoCapture\Virtualenv\Scripts\python.exe D:/Projects/Applications/VideoCapture/Sources/Application/video_capture.py "USB Video Device" 1280 720
ffmpeg version 4.4-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --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-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, dshow, from 'video=USB Video Device':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
Press [q] to stop, [?] for help
video=USB Video Device: I/O error
Output #0, rawvideo, to 'pipe:':
  Metadata:
    encoder         : Lavf58.76.100
  Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1280x720, q=2-31, 663552 kb/s, 30 fps, 30 tbn
    Metadata:
      encoder         : Lavc58.134.100 rawvideo
frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)


  


  The inportant row is USB Video Device : I/O error
  
I've tried also to add shell=True to the Popen but with the same result.

  


  Doing some tests I found that using pycharm debug mode or simply lunching the same code inside "Pycharm Python Console" no more I/O error and all seems to work. I think something changes in the environment created for the subrocess but I wasn't able to understand what PyCharm is doing under the hood.

  


  Here the output inside PyCharm Python Console

  


  D:\Projects\Applications\VideoCapture\Virtualenv\Scripts\python.exe "C:\Program Files\JetBrains\PyCharm Community Edition 2019.1.1\plugins\python-ce\helpers\pydev\pydevconsole.py" --mode=client --port=65058
import sys; print('Python %s on %s' % (sys.version, sys.platform))
sys.path.extend(['D:\\Projects\\Applications\\VideoCapture', 'D:\\Projects\\Applications\\VideoCapture\\Sources\\Application', 'D:\\Projects\\Applications\\VideoCapture\\Sources\\Compiler', 'D:/Projects/Applications/VideoCapture'])
PyDev console: starting.
Python 3.7.4 (tags/v3.7.4:e09359112e, Jul  8 2019, 20:34:20) [MSC v.1916 64 bit (AMD64)] on win32
runfile('D:/Projects/Applications/VideoCapture/Sources/Application/video_capture.py', args=['USB Video Device', '1280', '720'], wdir='D:/Projects/Applications/VideoCapture/Sources/Application')
ffmpeg version 4.4-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --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-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, dshow, from 'video=USB Video Device':
  Duration: N/A, start: 111984.462000, bitrate: N/A
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, rawvideo, to 'pipe:':
  Metadata:
    encoder         : Lavf58.76.100
  Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24(pc, progressive), 1280x720, q=2-31, 663552 kb/s, 30 fps, 30 tbn
    Metadata:
      encoder         : Lavc58.134.100 rawvideo
av_interleaved_write_frame(): Invalid argument
    Last message repeated 1 times
Error writing trailer of pipe:: Invalid argument
frame=  118 fps= 30 q=-0.0 Lsize=  313200kB time=00:00:03.93 bitrate=652306.1kbits/s dup=53 drop=0 speed=   1x


  


  Does anyone now how to fix this problem or have any knowledge on how PyCharm Python Console works ?