In [1]:
import ffmpeg
import subprocess
import os
import csv
from pathlib import Path
In [2]:
# 1. Trim the video (preserve timestamps)
def trim_video(input_path, output_path, start, end=None):
read_args = dict(ss=start)
if end is not None:
read_args['to'] = end
(
ffmpeg
.input(input_path, **read_args)
.output(output_path, c='copy')
.global_args('-copyts', '-avoid_negative_ts', 'make_zero')
.overwrite_output()
.run()
)
# 2. Get frame timestamps from the trimmed video
def extract_timestamps(video_path, csv_path):
result = subprocess.run([
"ffprobe", "-v", "error",
"-select_streams", "v:0",
"-show_entries", "frame=pkt_pts_time",
"-of", "csv=p=0",
video_path
], stdout=subprocess.PIPE, text=True)
timestamps = [float(line.strip()) for line in result.stdout.strip().splitlines() if line.strip()]
with open(csv_path, "w", newline='') as f:
writer = csv.writer(f)
writer.writerow(["frame_index", "timestamp"])
for i, ts in enumerate(timestamps):
writer.writerow([i+1, f"{ts:.6f}"])
return timestamps
# 3. Extract frames as sequential files (frame_0001.png etc.)
def extract_frames(video_path, output_dir):
os.makedirs(output_dir, exist_ok=True)
subprocess.run([
"ffmpeg", "-i", video_path,
"-vsync", "0",
os.path.join(output_dir, "frame_%04d.png")
], check=True)
Slow Mo video¶
In [3]:
VIDEO_PATH = "videos/cansat-slowmo-full.MOV"
OUTPUT_DIR = Path("cansat-slowmo-full")
START = 30.1
END = 30.4
OUTPUT_DIR.mkdir(parents=True, exist_ok=True)
trim_video(VIDEO_PATH, f"{OUTPUT_DIR}/snippet.mov", START, END)
extract_timestamps(f"{OUTPUT_DIR}/snippet.mov", f"{OUTPUT_DIR}/snippet.csv")
extract_frames(f"{OUTPUT_DIR}/snippet.mov", OUTPUT_DIR)
ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --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-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
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
Trailing option(s) found in the command: may be ignored.
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videos/cansat-slowmo-full.MOV':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
creation_time : 2025-04-05T14:33:41.000000Z
com.apple.quicktime.location.accuracy.horizontal: 7.217961
com.apple.quicktime.full-frame-rate-playback-intent: 0
com.apple.quicktime.location.ISO6709: +52.1678+004.4969+001.682/
com.apple.quicktime.make: Apple
com.apple.quicktime.model: iPhone 14 Pro
com.apple.quicktime.software: 18.3.2
com.apple.quicktime.creationdate: 2025-04-05T16:33:41+0200
Duration: 00:02:30.70, start: 0.000000, bitrate: 50779 kb/s
Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709), 1920x1080, 50540 kb/s, 161.63 fps, 240 tbr, 2400 tbn, 2400 tbc (default)
Metadata:
rotate : 180
creation_time : 2025-04-05T14:33:41.000000Z
handler_name : Core Media Video
vendor_id : [0][0][0][0]
encoder : HEVC
Side data:
displaymatrix: rotation of -180.00 degrees
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 186 kb/s (default)
Metadata:
creation_time : 2025-04-05T14:33:41.000000Z
handler_name : Core Media Audio
vendor_id : [0][0][0][0]
Stream #0:2(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
Metadata:
creation_time : 2025-04-05T14:33:41.000000Z
handler_name : Core Media Metadata
Output #0, mov, to 'cansat-slowmo-full/snippet.mov':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
com.apple.quicktime.creationdate: 2025-04-05T16:33:41+0200
com.apple.quicktime.location.accuracy.horizontal: 7.217961
com.apple.quicktime.full-frame-rate-playback-intent: 0
com.apple.quicktime.location.ISO6709: +52.1678+004.4969+001.682/
com.apple.quicktime.make: Apple
com.apple.quicktime.model: iPhone 14 Pro
com.apple.quicktime.software: 18.3.2
encoder : Lavf58.76.100
Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709), 1920x1080, q=2-31, 50540 kb/s, 161.63 fps, 240 tbr, 19200 tbn, 2400 tbc (default)
Metadata:
rotate : 180
creation_time : 2025-04-05T14:33:41.000000Z
handler_name : Core Media Video
vendor_id : [0][0][0][0]
encoder : HEVC
Side data:
displaymatrix: rotation of -180.00 degrees
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 186 kb/s (default)
Metadata:
creation_time : 2025-04-05T14:33:41.000000Z
handler_name : Core Media Audio
vendor_id : [0][0][0][0]
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 309 fps=0.0 q=-1.0 Lsize= 11943kB time=00:00:01.88 bitrate=51855.6kbits/s speed=26.2x
video:11886kB audio:49kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.069862%
ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --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-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
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, mov,mp4,m4a,3gp,3g2,mj2, from 'cansat-slowmo-full/snippet.mov':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf58.76.100
Duration: 00:00:30.45, start: 28.466009, bitrate: 3213 kb/s
Stream #0:0: Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709), 1920x1080, 51346 kb/s, 162.95 fps, 240 tbr, 19200 tbn, 19200 tbc (default)
Metadata:
rotate : 180
handler_name : Core Media Video
vendor_id : FFMP
encoder : HEVC
Side data:
displaymatrix: rotation of -180.00 degrees
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 206 kb/s (default)
Metadata:
handler_name : Core Media Audio
vendor_id : [0][0][0][0]
Stream mapping:
Stream #0:0 -> #0:0 (hevc (native) -> png (native))
Press [q] to stop, [?] for help
Output #0, image2, to 'cansat-slowmo-full/frame_%04d.png':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf58.76.100
Stream #0:0: Video: png, rgb24(pc, gbr/bt709/bt709, progressive), 1920x1080, q=2-31, 200 kb/s, 240 fps, 240 tbn (default)
Metadata:
encoder : Lavc58.134.100 png
handler_name : Core Media Video
vendor_id : FFMP
Side data:
displaymatrix: rotation of -0.00 degrees
frame= 306 fps= 50 q=-0.0 Lsize=N/A time=00:00:01.98 bitrate=N/A speed=0.324x
video:961832kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Full flight video¶
In [4]:
VIDEO_PATH = "videos/cansat-full.mov"
OUTPUT_DIR = Path("cansat-full")
START = 18
OUTPUT_DIR.mkdir(parents=True, exist_ok=True)
trim_video(VIDEO_PATH, f"{OUTPUT_DIR}/snippet.mov", START)
extract_timestamps(f"{OUTPUT_DIR}/snippet.mov", f"{OUTPUT_DIR}/snippet.csv")
extract_frames(f"{OUTPUT_DIR}/snippet.mov", OUTPUT_DIR)
ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --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-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
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
Trailing option(s) found in the command: may be ignored.
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videos/cansat-full.mov':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
creation_time : 2025-04-05T14:33:53.000000Z
com.apple.quicktime.location.accuracy.horizontal: 17.246605
com.apple.quicktime.full-frame-rate-playback-intent: 0
com.apple.quicktime.location.ISO6709: +52.1677+004.4969+001.010/
com.apple.quicktime.make: Apple
com.apple.quicktime.model: iPhone 11
com.apple.quicktime.software: 18.3.2
com.apple.quicktime.creationdate: 2025-04-05T16:33:53+0200
Duration: 00:00:25.83, start: 0.000000, bitrate: 54267 kb/s
Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709), 3840x2160, 53997 kb/s, 59.97 fps, 59.94 tbr, 600 tbn, 600 tbc (default)
Metadata:
creation_time : 2025-04-05T14:33:53.000000Z
handler_name : Core Media Video
vendor_id : [0][0][0][0]
encoder : HEVC
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 177 kb/s (default)
Metadata:
creation_time : 2025-04-05T14:33:53.000000Z
handler_name : Core Media Audio
vendor_id : [0][0][0][0]
Stream #0:2(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
Metadata:
creation_time : 2025-04-05T14:33:53.000000Z
handler_name : Core Media Metadata
Stream #0:3(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
Metadata:
creation_time : 2025-04-05T14:33:53.000000Z
handler_name : Core Media Metadata
Stream #0:4(und): Data: none (mebx / 0x7862656D), 69 kb/s (default)
Metadata:
creation_time : 2025-04-05T14:33:53.000000Z
handler_name : Core Media Metadata
Stream #0:5(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
Metadata:
creation_time : 2025-04-05T14:33:53.000000Z
handler_name : Core Media Metadata
Output #0, mov, to 'cansat-full/snippet.mov':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
com.apple.quicktime.creationdate: 2025-04-05T16:33:53+0200
com.apple.quicktime.location.accuracy.horizontal: 17.246605
com.apple.quicktime.full-frame-rate-playback-intent: 0
com.apple.quicktime.location.ISO6709: +52.1677+004.4969+001.010/
com.apple.quicktime.make: Apple
com.apple.quicktime.model: iPhone 11
com.apple.quicktime.software: 18.3.2
encoder : Lavf58.76.100
Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709), 3840x2160, q=2-31, 53997 kb/s, 59.97 fps, 59.94 tbr, 19200 tbn, 600 tbc (default)
Metadata:
creation_time : 2025-04-05T14:33:53.000000Z
handler_name : Core Media Video
vendor_id : [0][0][0][0]
encoder : HEVC
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 177 kb/s (default)
Metadata:
creation_time : 2025-04-05T14:33:53.000000Z
handler_name : Core Media Audio
vendor_id : [0][0][0][0]
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 488 fps=0.0 q=-1.0 Lsize= 65415kB time=00:00:08.16 bitrate=65665.1kbits/s speed= 101x
video:65220kB audio:179kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.023211%
ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --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-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
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, mov,mp4,m4a,3gp,3g2,mj2, from 'cansat-full/snippet.mov':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf58.76.100
Duration: 00:00:25.83, start: 17.621995, bitrate: 20744 kb/s
Stream #0:0: Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709), 3840x2160, 65650 kb/s, 59.96 fps, 60 tbr, 19200 tbn, 19200 tbc (default)
Metadata:
handler_name : Core Media Video
vendor_id : FFMP
encoder : HEVC
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 178 kb/s (default)
Metadata:
handler_name : Core Media Audio
vendor_id : [0][0][0][0]
Stream mapping:
Stream #0:0 -> #0:0 (hevc (native) -> png (native))
Press [q] to stop, [?] for help
Output #0, image2, to 'cansat-full/frame_%04d.png':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf58.76.100
Stream #0:0: Video: png, rgb24(pc, gbr/bt709/bt709, progressive), 3840x2160, q=2-31, 200 kb/s, 60 fps, 60 tbn (default)
Metadata:
handler_name : Core Media Video
vendor_id : FFMP
encoder : Lavc58.134.100 png
frame= 485 fps= 12 q=-0.0 Lsize=N/A time=00:00:08.21 bitrate=N/A speed=0.204x
video:5385591kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
In [ ]: