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When I run ffprobe <video>, I get the standard metadata as below:

ffprobe version 4.3.1 Copyright (c) 2007-2020 the FFmpeg developers built with Apple clang version 11.0.3 (clang-1103.0.32.62) configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-librsvg --enable-libtheora --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libsoxr --enable-libspeex --enable-libass --enable-libbluray --enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype --enable-libfribidi --disable-libjack --disable-libopencore-amrnb --disable-libopencore-amrwb --disable-libxcb --disable-libxcb-shm --disable-libxcb-xfixes --disable-indev=jack --enable-opencl --disable-outdev=xv --enable-audiotoolbox --enable-videotoolbox --enable-sdl2 --disable-securetransport --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --enable-libdav1d --arch=x86_64 --enable-x86asm --enable-libx265 --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid 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 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 7.100 / 5. 7.100 libswresample 3. 7.100 / 3. 7.100 libpostproc 55. 7.100 / 55. 7.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../directConversion/200mbs105_55.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.45.100 Duration: 00:01:12.43, start: 0.000000, bitrate: 213963 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1080x1920 [SAR 1:1 DAR 9:16], 213828 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default) Metadata: handler_name : Core Media Video Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default) Metadata: handler_name : Core Media Audio

I want to get this information from python so I can parse this output and use some of it in my code. However, I can't get this to work.

I have tried the following:

data = subprocess.call(f'ffprobe {video}', shell=True) data = subprocess.check_output(f'ffprobe {vid}', shell=True) data = subprocess.Popen(f'ffprobe {vid}', shell=True) data = subprocess. Popen(f'ffprobe {vid}', stdout=subprocess.PIPE ).communicate()[0] data = run(f'ffprobe {vid}', capture_output=True).stdout

If I include shell=True, then the proper information prints in the terminal but I get an empty string for data. For commands without shell=True I get file not found error and it breaks. What should I do? I got all of these solutions from SO and they seem to work for others.

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  • ffprobe is in your shell path, but not in the path of Python context. As an ad hock solution, you can use full path. The default path in Linux is /usr/bin/ffprobe. If it isn't there, use which ffprobe in your shell. Note: for easy parsing, you may ask FFprobe to return the data in JSON format, and convert the string to Python dictionary. Commented Apr 29, 2021 at 13:45
  • When I run which ffprobe I get /opt/local/bin/ffprobe. What should I do with this info? Also, how do I get the JSON as you recommend? Commented Apr 29, 2021 at 13:50
  • Changing my command to f'/opt/local/bin/ffprobe {vid} results in no change Commented Apr 29, 2021 at 13:51
  • Are you using Mac or Linux? I don't think I can help you with the path. For JSON format, use ffprobe -print_format json. Then use dict = json.loads(data). Commented Apr 29, 2021 at 14:11
  • 1
    I think I know the problem: You should use shlex.split: data = run(shlex.split(f'ffprobe {vid} -print_format json'), capture_output=True).stdout Commented Apr 29, 2021 at 14:21

1 Answer 1

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You may use shlex.split or put the arguments to FFprobe in a list.

In Windows OS, you can use sp.run(f'ffprobe {video}' ...
In Linux and Mac, Python tries to execute the command as file name with spaces.
For example: 'ffprobe vid.mp4' is considered a single executable command (file name with space).

You may use an arguments list:
sp.run(['ffprobe', f'{video}']...

Or use shlex.split for splitting the shell command to a list:
sp.run(shlex.split(f'ffprobe {video}'))...

For simple parsing FFprobe output in Python:

  • Execute ffprobe with -of json argument, and get the output in JSON format.
  • Convert the output string to dictionary using json.loads.

Here is a code sample that reads the output of FFprobe into a dictionary:

import subprocess as sp import shlex import json video = 'vid.mkv' # Execute ffprobe (to show streams), and get the output in JSON format data = sp.run(shlex.split(f'ffprobe -loglevel error -show_streams -of json {video}'), capture_output=True).stdout # Same - using a list of arguments: # data = sp.run(['ffprobe', '-loglevel', 'error', '-show_streams', '-of', 'json', f'{video}'], capture_output=True).stdout # Convert data from JSON string to dictionary d = json.loads(data) print(d) # Print the dictionary for testing

Notes:

  • I used -show_streams argument as an example.
    In case there is missing (or too much) information, look for the relevant set of arguments.
  • The example assumes that ffprobe is in the execution path.
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