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• mp4 created by ffmpeg will not play with IPython.display.Video

  19 novembre 2020, par Austin

  I'm creating a mp4 video from jpegs with ffmpeg, using the following command :

  


  ffmpeg -y -threads 0 -f image2 -i jpegs/%05d.jpg -framerate 10 video.mp4

  


  The resulting video will play fine with VLC, but will not play in a Jupyter notebook via :

  


  from IPython.display import Video
Video('video.mp4')


  


  This notebook video functionality has worked for me in the past, so I assume there's something about the codec/mime type that the Video function can't resolve ?

  


  ---

  


  Requested update

  


  New command I've tried :

  


  ffmpeg -y -framerate 10 -i jpegs/%05d.jpg -vf format=yuv420p -movflags +faststart video.mp4

  


  Video still plays fine in VLC and still does not play in Jupyter. I've looked at the duplicates this is marked as and it does not actually seem to be the same issue..

  


  Here's the output (I've removed the framerate and threads flags to simplify) :

  


  algo-1-poqk5_1  | 2020-11-18 21:19:36 [INFO]: ffmpeg output:
algo-1-poqk5_1  | 2020-11-18 21:19:36 [INFO]: ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers
algo-1-poqk5_1  |   built with gcc 7.2.0 (crosstool-NG fa8859cb)
algo-1-poqk5_1  |   configuration: --prefix=/opt/conda --cc=/opt/conda/conda-bld/ffmpeg_1531088893642/_build_env/bin/x86_64-conda_cos6-linux-gnu-cc --disable-doc --enable-shared --enable-static --enable-zlib --enable-pic --enable-gpl --enable-version3 --disable-nonfree --enable-hardcoded-tables --enable-avresample --enable-libfreetype --disable-openssl --disable-gnutls --enable-libvpx --enable-pthreads --enable-libopus --enable-postproc --disable-libx264
algo-1-poqk5_1  |   libavutil      56. 14.100 / 56. 14.100
algo-1-poqk5_1  |   libavcodec     58. 18.100 / 58. 18.100
algo-1-poqk5_1  |   libavformat    58. 12.100 / 58. 12.100
algo-1-poqk5_1  |   libavdevice    58.  3.100 / 58.  3.100
algo-1-poqk5_1  |   libavfilter     7. 16.100 /  7. 16.100
algo-1-poqk5_1  |   libavresample   4.  0.  0 /  4.  0.  0
algo-1-poqk5_1  |   libswscale      5.  1.100 /  5.  1.100
algo-1-poqk5_1  |   libswresample   3.  1.100 /  3.  1.100
algo-1-poqk5_1  |   libpostproc    55.  1.100 / 55.  1.100
algo-1-poqk5_1  | Input #0, image2, from '/opt/ml/model/outputs/01-IR.mp4_1/%05d.jpg':
algo-1-poqk5_1  |   Duration: 00:00:12.00, start: 0.000000, bitrate: N/A
algo-1-poqk5_1  |     Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
algo-1-poqk5_1  | Stream mapping:
algo-1-poqk5_1  |   Stream #0:0 -> #0:0 (mjpeg (native) -> mpeg4 (native))
algo-1-poqk5_1  | Press [q] to stop, [?] for help
algo-1-poqk5_1  | [swscaler @ 0x55b8cc6fcc40] deprecated pixel format used, make sure you did set range correctly
algo-1-poqk5_1  | Output #0, mp4, to '/opt/ml/model/outputs/01-IR.mp4_1/video.mp4':
algo-1-poqk5_1  |   Metadata:
algo-1-poqk5_1  |     encoder         : Lavf58.12.100
algo-1-poqk5_1  |     Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 12800 tbn, 25 tbc
algo-1-poqk5_1  |     Metadata:
algo-1-poqk5_1  |       encoder         : Lavc58.18.100 mpeg4
algo-1-poqk5_1  |     Side data:
algo-1-poqk5_1  |       cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
algo-1-poqk5_1  | frame=   31 fps=0.0 q=31.0 size=     768kB time=00:00:01.20 bitrate=5242.8kbits/s speed=2.33x    
algo-1-poqk5_1  | frame=   64 fps= 63 q=31.0 size=    1280kB time=00:00:02.52 bitrate=4161.0kbits/s speed=2.48x    
algo-1-poqk5_1  | frame=   98 fps= 64 q=31.0 size=    1792kB time=00:00:03.88 bitrate=3783.5kbits/s speed=2.53x    
algo-1-poqk5_1  | frame=  131 fps= 64 q=31.0 size=    2304kB time=00:00:05.20 bitrate=3629.7kbits/s speed=2.55x    
algo-1-poqk5_1  | frame=  164 fps= 64 q=31.0 size=    2560kB time=00:00:06.52 bitrate=3216.5kbits/s speed=2.56x    
algo-1-poqk5_1  | frame=  198 fps= 65 q=31.0 size=    3072kB time=00:00:07.88 bitrate=3193.6kbits/s speed=2.58x    
algo-1-poqk5_1  | frame=  232 fps= 65 q=31.0 size=    3328kB time=00:00:09.24 bitrate=2950.6kbits/s speed= 2.6x    
algo-1-poqk5_1  | frame=  266 fps= 66 q=31.0 size=    3840kB time=00:00:10.60 bitrate=2967.7kbits/s speed=2.62x    
algo-1-poqk5_1  | frame=  299 fps= 66 q=31.0 size=    4096kB time=00:00:11.92 bitrate=2815.0kbits/s speed=2.62x    
algo-1-poqk5_1  | [mp4 @ 0x55b8cc658900] Starting second pass: moving the moov atom to the beginning of the file
algo-1-poqk5_1  | frame=  300 fps= 65 q=31.0 Lsize=    4202kB time=00:00:11.96 bitrate=2877.9kbits/s speed=2.61x    
algo-1-poqk5_1  | video:4199kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.052020%


  


• ffmpeg detects a videofile path when it does not exist

  17 novembre 2020, par Nejc Kejzar

  this is boggling my mind. I am using ffmpeg to compress videos within the following python script :

  


  import re
import os

kage = 'MH5'
year = '2020'
month = '11'
day = '10'

# Set output dir; create it if it doesn't exist yet
downsampled_video_dir = home_data_dir + f'piCamera/downsampled_videos/{kage}/{year}/{month}/{day}/'
Path(downsampled_video_dir).mkdir(parents=True, exist_ok=True)
    
for i, video in enumerate(videos):
        # Set ffmpeg video compression terminal command and output directory for downsampled videos
        video_name = re.findall('\d+_\d+.mp4', video)[0]
        ds_output = downsampled_video_dir + video_name
        compress_command = f"ffmpeg -i {video} -vf scale={video_res[0]}:-2 {ds_output}"
        
        # Run ffmpeg video compression
        os.system(compress_command)


  


  videos is a list of full video paths of the videos that I wish to compress, and ds_output is a full path of where to write the compressed video. video_res[0] contains the desired height of the video with the following -2 automatically calculating the width so that the aspect ratio is preserved.

  


  For some reason when running this, ffmpeg detects some of the videos in the output directory as already existing and asks if I wish to overwrite them. The videos of course aren't there yet, so when I pass y, ffmpeg complains that no such file exists. Here is an example output for one of the problematic videos :

  


  ffmpeg -y -i '/home/piCamera/MH4/2020/11/10/20201110_085451.mp4' -vf scale=400:300  '/home/piCamera/downsampled_videos/MH4/2020/11/10/20201110_085451.mp4'
ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
  configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/piCamera/MH4/2020/11/10/20201110_085451.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.20.100
  Duration: 00:03:58.84, start: 0.000000, bitrate: 1190 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 960x720, 1190 kb/s, 5 fps, 5 tbr, 10240 tbn, 20480 tbc (default)
    Metadata:
      handler_name    : VideoHandler
/home/piCamera/downsampled_videos/MH4/2020/11/10/20201110_085451.mp4: No such file or directory


  


  This happens with about 3 videos out of 53, the rest run normally. I've tried restarting the terminal, deleted the whole created downsampled_video_dir and run again, but no matter how many times I restart, the same videos are the problem. The only thing that appears to help is if I change the output directory name. Any ideas of why this strange error is happening ?

  


  This is being run on Ubuntu20 with python3.7.9 in a Jupyter Notebook.

  


  Many, many thanks for all the insights !

  


• Error Exception : You do not have ffmpeg installed on your machine when using python bar_chart_race with reticulate in rstudio

  27 septembre 2020, par Zhiqiang Wang

  I have run python bar_chart_race successfully in jupyter notebook.

  


  import bar_chart_race as bcr
bcr.bar_chart_race(df=wide_1, filename=None, title='Mortality (per million) by Country')


  


  I have ffmpeg installed on my machine.

  


  > Sys.which("ffmpeg")
                       ffmpeg 
"C:\\ffmpeg\\bin\\ffmpeg.exe" 


  


  However, when I tried the same code in rmarkdown with rstudio reticulate,

  


  import bar_chart_race as bcr
bcr.bar_chart_race(wide_1)


  


  I received the following message :

  


  Exception: You do not have ffmpeg installed on your machine. Download
                            ffmpeg from here: https://www.ffmpeg.org/download.html.
                            
                            Matplotlib's original error message below:

                            [WinError 6] The handle is invalid


  


  reticulate::py_config()

  


  > reticulate::py_config()
python:         C:/ProgramData/Anaconda3/python.exe
libpython:      C:/ProgramData/Anaconda3/python38.dll
pythonhome:     C:/ProgramData/Anaconda3
version:        3.8.3 (default, Jul  2 2020, 17:30:36) [MSC v.1916 64 bit (AMD64)]
Architecture:   64bit
numpy:          C:/ProgramData/Anaconda3/Lib/site-packages/numpy
numpy_version:  1.18.5


  


  ffmpeg works fine with R animated graph packages in rstudio, and with python bar_chart_race. I have tried to re-install ffmpeg several times. Any advice would be appreciated.