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Sur d’autres sites (501)
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FFmpeg stuck on frame 0 during time-lapse conversion with `-ss` start time
2 janvier 2021, par rgovI have a long video that I'd like to speed up into a time-lapse. Following the FFmpeg wiki, I came up with this incantation :



ffmpeg -i IMG_0238.MOV -r 60 -ss 00:04:41 -filter:v "setpts=PTS/60.0" -an output.mp4




It should clip off the first few minutes, then create a new 60fps video file at 60x the speed.



Although it spins all my CPU cores up to 100%, the status bar simply shows
frame= 0 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x
and never progresses.


The problem seems related to the
-ss 00:04:41
flag, which specifies the start time ; I want to drop the first 4 minutes 41 seconds of source video. When I omit this option, the video conversion succeeds.


Full log follows.





ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
 built with Apple LLVM version 9.1.0 (clang-902.0.30)
 configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4.1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
 libavutil 55. 78.100 / 55. 78.100
 libavcodec 57.107.100 / 57.107.100
 libavformat 57. 83.100 / 57. 83.100
 libavdevice 57. 10.100 / 57. 10.100
 libavfilter 6.107.100 / 6.107.100
 libavresample 3. 7. 0 / 3. 7. 0
 libswscale 4. 8.100 / 4. 8.100
 libswresample 2. 9.100 / 2. 9.100
 libpostproc 54. 7.100 / 54. 7.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb59b800000] stream 2, missing mandatory atoms, broken header
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb59b800000] stream 3, missing mandatory atoms, broken header
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'IMG_0238.MOV':
 Metadata:
 major_brand : qt 
 minor_version : 0
 compatible_brands: qt 
 creation_time : 2017-04-20T16:25:14.000000Z
 com.apple.quicktime.location.ISO6709: +36.4610+025.3727+123.613/
 com.apple.quicktime.make: Apple
 com.apple.quicktime.model: iPhone 7
 com.apple.quicktime.software: 10.3.1
 com.apple.quicktime.creationdate: 2017-04-20T19:25:13+0300
 Duration: 01:22:45.53, start: -0.000023, bitrate: 44171 kb/s
 Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 3840x2160, 44077 kb/s, 30 fps, 30 tbr, 600 tbn, 1200 tbc (default)
 Metadata:
 rotate : 180
 creation_time : 2017-04-20T16:25:14.000000Z
 handler_name : Core Media Data Handler
 encoder : H.264
 Side data:
 displaymatrix: rotation of -180.00 degrees
 Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 84 kb/s (default)
 Metadata:
 creation_time : 2017-04-20T16:25:14.000000Z
 handler_name : Core Media Data Handler
 Stream #0:2(und): Data: none (mebx / 0x7862656D) (default)
 Metadata:
 creation_time : 2017-04-20T16:25:14.000000Z
 handler_name : Core Media Data Handler
 Stream #0:3(und): Data: none (mebx / 0x7862656D) (default)
 Metadata:
 creation_time : 2017-04-20T16:25:14.000000Z
 handler_name : Core Media Data Handler
File 'output.mp4' already exists. Overwrite ? [y/N] y
Stream mapping:
 Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x7fb59b82b800] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0x7fb59b82b800] profile High, level 5.2
[libx264 @ 0x7fb59b82b800] 264 - core 148 r2795 aaa9aa8 - 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=6 lookahead_threads=1 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:
 major_brand : qt 
 minor_version : 0
 compatible_brands: qt 
 com.apple.quicktime.creationdate: 2017-04-20T19:25:13+0300
 com.apple.quicktime.location.ISO6709: +36.4610+025.3727+123.613/
 com.apple.quicktime.make: Apple
 com.apple.quicktime.model: iPhone 7
 com.apple.quicktime.software: 10.3.1
 encoder : Lavf57.83.100
 Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 3840x2160, q=-1--1, 60 fps, 15360 tbn, 60 tbc (default)
 Metadata:
 encoder : Lavc57.107.100 libx264
 creation_time : 2017-04-20T16:25:14.000000Z
 handler_name : Core Media Data Handler
 Side data:
 cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
 displaymatrix: rotation of -0.00 degrees
frame= 0 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x



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Python : Extracting device and lens information from video metadata
14 mai 2023, par cat_got_my_tongueI am interested in extracting device and lens information from videos. Specifically, make and model of the device and the focal length. I was able to do this successfully for still images using the
exifread
module and extract a whole bunch of very useful information :

image type : MPO
Image ImageDescription: Shot with DxO ONE
Image Make: DxO
Image Model: DxO ONE
Image Orientation: Horizontal (normal)
Image XResolution: 300
Image YResolution: 300
Image ResolutionUnit: Pixels/Inch
Image Software: V3.0.0 (2b448a1aee) APP:1.0
Image DateTime: 2022:04:05 14:53:45
Image YCbCrCoefficients: [299/1000, 587/1000, 57/500]
Image YCbCrPositioning: Centered
Image ExifOffset: 158
Thumbnail Compression: JPEG (old-style)
Thumbnail XResolution: 300
Thumbnail YResolution: 300
Thumbnail ResolutionUnit: Pixels/Inch
Thumbnail JPEGInterchangeFormat: 7156
Thumbnail JPEGInterchangeFormatLength: 24886
EXIF ExposureTime: 1/3
EXIF FNumber: 8
EXIF ExposureProgram: Aperture Priority
EXIF ISOSpeedRatings: 100
EXIF SensitivityType: ISO Speed
EXIF ISOSpeed: 100
EXIF ExifVersion: 0221
EXIF DateTimeOriginal: 2022:04:05 14:53:45
EXIF DateTimeDigitized: 2022:04:05 14:53:45
EXIF ComponentsConfiguration: CrCbY
EXIF CompressedBitsPerPixel: 3249571/608175
EXIF ExposureBiasValue: 0
EXIF MaxApertureValue: 212/125
EXIF SubjectDistance: 39/125
EXIF MeteringMode: MultiSpot
EXIF LightSource: Unknown
EXIF Flash: Flash did not fire
EXIF FocalLength: 1187/100
EXIF SubjectArea: [2703, 1802, 675, 450]
EXIF MakerNote: [68, 88, 79, 32, 79, 78, 69, 0, 12, 0, 0, 0, 21, 0, 3, 0, 5, 0, 2, 0, ... ]
EXIF SubSecTime: 046
EXIF SubSecTimeOriginal: 046
EXIF SubSecTimeDigitized: 046
EXIF FlashPixVersion: 0100
EXIF ColorSpace: sRGB
EXIF ExifImageWidth: 5406
EXIF ExifImageLength: 3604
Interoperability InteroperabilityIndex: R98
Interoperability InteroperabilityVersion: [48, 49, 48, 48]
EXIF InteroperabilityOffset: 596
EXIF FileSource: Digital Camera
EXIF ExposureMode: Auto Exposure
EXIF WhiteBalance: Auto
EXIF DigitalZoomRatio: 1
EXIF FocalLengthIn35mmFilm: 32
EXIF SceneCaptureType: Standard
EXIF ImageUniqueID: C01A1709306530020220405185345046
EXIF BodySerialNumber: C01A1709306530



Unfortunately, I have been unable to extract this kind of info from videos so far.


This is what I have tried so far, with the
ffmpeg
module :

import ffmpeg
from pprint import pprint

test_video = "my_video.mp4"
pprint(ffmpeg.probe(test_video)["streams"])



And the output I get contains a lot of info but nothing related to the device or lens, which is what I am looking for :


[{'avg_frame_rate': '30/1',
 'bit_rate': '1736871',
 'bits_per_raw_sample': '8',
 'chroma_location': 'left',
 'codec_long_name': 'H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10',
 'codec_name': 'h264',
 'codec_tag': '0x31637661',
 'codec_tag_string': 'avc1',
 'codec_time_base': '1/60',
 'codec_type': 'video',
 'coded_height': 1088,
 'coded_width': 1920,
 'display_aspect_ratio': '16:9',
 'disposition': {'attached_pic': 0,
 'clean_effects': 0,
 'comment': 0,
 'default': 1,
 'dub': 0,
 'forced': 0,
 'hearing_impaired': 0,
 'karaoke': 0,
 'lyrics': 0,
 'original': 0,
 'timed_thumbnails': 0,
 'visual_impaired': 0},
 'duration': '20.800000',
 'duration_ts': 624000,
 'has_b_frames': 0,
 'height': 1080,
 'index': 0,
 'is_avc': 'true',
 'level': 40,
 'nal_length_size': '4',
 'nb_frames': '624',
 'pix_fmt': 'yuv420p',
 'profile': 'Constrained Baseline',
 'r_frame_rate': '30/1',
 'refs': 1,
 'sample_aspect_ratio': '1:1',
 'start_pts': 0,
 'start_time': '0.000000',
 'tags': {'creation_time': '2021-05-08T13:23:20.000000Z',
 'encoder': 'AVC Coding',
 'handler_name': 'VideoHandler',
 'language': 'und'},
 'time_base': '1/30000',
 'width': 1920},
 {'avg_frame_rate': '0/0',
 'bit_rate': '79858',
 'bits_per_sample': 0,
 'channel_layout': 'stereo',
 'channels': 2,
 'codec_long_name': 'AAC (Advanced Audio Coding)',
 'codec_name': 'aac',
 'codec_tag': '0x6134706d',
 'codec_tag_string': 'mp4a',
 'codec_time_base': '1/48000',
 'codec_type': 'audio',
 'disposition': {'attached_pic': 0,
 'clean_effects': 0,
 'comment': 0,
 'default': 1,
 'dub': 0,
 'forced': 0,
 'hearing_impaired': 0,
 'karaoke': 0,
 'lyrics': 0,
 'original': 0,
 'timed_thumbnails': 0,
 'visual_impaired': 0},
 'duration': '20.864000',
 'duration_ts': 1001472,
 'index': 1,
 'max_bit_rate': '128000',
 'nb_frames': '978',
 'profile': 'LC',
 'r_frame_rate': '0/0',
 'sample_fmt': 'fltp',
 'sample_rate': '48000',
 'start_pts': 0,
 'start_time': '0.000000',
 'tags': {'creation_time': '2021-05-08T13:23:20.000000Z',
 'handler_name': 'SoundHandler',
 'language': 'und'},
 'time_base': '1/48000'}]



Are these pieces of info available for videos ? Should I be using a different package ?


Thanks.


Edit :


pprint(ffmpeg.probe(test_video)["format"])
gives

{'bit_rate': '1815244',
 'duration': '20.864000',
 'filename': 'my_video.mp4',
 'format_long_name': 'QuickTime / MOV',
 'format_name': 'mov,mp4,m4a,3gp,3g2,mj2',
 'nb_programs': 0,
 'nb_streams': 2,
 'probe_score': 100,
 'size': '4734158',
 'start_time': '0.000000',
 'tags': {'artist': 'Microsoft Game DVR',
 'compatible_brands': 'mp41isom',
 'creation_time': '2021-05-08T12:12:33.000000Z',
 'major_brand': 'mp42',
 'minor_version': '0',
 'title': 'Snipping Tool'}}



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Revision 30966 : eviter le moche ’doctype_ecrire’ lors de l’upgrade
17 août 2009, par fil@… — Logeviter le moche ’doctype_ecrire’ lors de l’upgrade