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• Anomalie #4275 (Nouveau) : Formulaire préférence

  23 janvier 2019, par Laurent Lefebvre

  Sur la page configurer_preferences, lorsque l’on appui sur Entré après avoir modifié ses préférences de menu, le formulaire réinitialise les valeurs.

  Il faudrait que par défaut, que le formulaire enregistre les valeurs.

• How to extract time-accurate video segments with ffmpeg ?

  25 mai 2016, par Jim Miller

  This is not a particularly new question area around here, but I’ve tried what’s been suggested there without much luck. So, my story :

  I’ve got a hunk of 15 seconds of straight-from-the-camera.mov video out of which I want to extract a specific chunk, which I can identify by start time and stop time, in seconds. I started by trying to do what I’ll call a "copy extraction" : to get seconds 9 to 12,

  ffmpeg -i test.mov -vcodec copy -acodec copy -ss 9 -to 12 test-copy.mov

  This was a not-bad start, but there are some black frames at the beginning and end of the clip, which I can’t have — it has to be a clean edit from the original. So, I tried recoding the original into a new, trimmed clip :

  ffmpeg -i test.mov -ss 00:00:09 -t 00:00:03 test-out.mov

  This is better, but not quite : There are no longer any black frames at the beginning of the clip, but they’re still there at the end.

  After some more browsing and reading, I then suspected that the problem is that ffmpeg is having trouble finding the proper points because of a lack of keyframes in the original video. So I recoded the original video to (presumably) add keyframes, in a couple of different ways. Since I want to be able to pick video at boundaries of a second ("from 9 seconds to 12 seconds"), I tried, copying various suggestions around the web,

  ffmpeg -i test.mov -force_key_frames "expr:gte(t, n_forced)" test-forced.mp4

  and

  ffmpeg -i test.mov -g 1 test-g-inserted.mp4

  (I built these as mp4’s based on some comments about an mp4 container being needed to support the keyframe search, but I’m honestly just hacking here.) I then tried the extraction as before, but on these new videos that presumably now have keyframes in them. No luck — both seem to be about the same ; the start is OK but there are still black frames at the end. (FWIW, both test-forced.mp4 and test-g-inserted.mp4 also have trailing black frames.)

  So : I’m still stuck, and would like to not be. Any insights out there as to what I’m doing wrong ? I feel like I’m close, but I really need to get rid of those trailing black frames....

• ffmep merge multiple (N) mono audio channels of a MXF video to multiple (M) stereo channels of MP4 video

  13 février 2020, par Laura

  I have an MXF file with 16 audio mono streams and I need to recode it in a mp4 file with 2<=n<=16 channels merging input streams, e.g. input channels 1 and 2 on output channel 1 and 9 and 10 on output channel 2. This job will be done with ffmpeg. I read the documentation and found the amerge and amix filters that would be nice, but they output one channel only. Is there any solution for this problem ?

  Thanks,
  Laura

  Find below the output of ffprobe on mxf file :

  
  "streams" :[
  
  "index":0,
  "codec_name" :"mpeg2video",
  "codec_long_name" :"MPEG-2 video",
  "profile" :"4:2:2",
  "codec_type" :"video",
  "codec_time_base" :"1/25",
  "codec_tag_string" :"[0][0][0][0]",
  "codec_tag" :"0x0000",
  "width":1920,
  "height":1080,
  "coded_width":0,
  "coded_height":0,
  "has_b_frames":1,
  "sample_aspect_ratio" :"1:1",
  "display_aspect_ratio" :"16:9",
  "pix_fmt" :"yuv422p",
  "level":2,
  "color_range" :"tv",
  "color_space" :"bt709",
  "color_transfer" :"bt709",
  "color_primaries" :"bt709",
  "chroma_location" :"topleft",
  "field_order" :"tt",
  "refs":1,
  "r_frame_rate" :"25/1",
  "avg_frame_rate" :"25/1",
  "time_base" :"1/25",
  "start_pts":0,
  "start_time" :"0.000000",
  "duration_ts":448,
  "duration" :"17.920000",
  "bit_rate" :"50000000",
  "disposition" :
  "default":0,
  "dub":0,
  "original":0,
  "comment":0,
  "lyrics":0,
  "karaoke":0,
  "forced":0,
  "hearing_impaired":0,
  "visual_impaired":0,
  "clean_effects":0,
  "attached_pic":0,
  "timed_thumbnails":0
  ,
  "tags" :
  "file_package_umid" :"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989"
  
  ,
  
  "index":1,
  "codec_name" :"pcm_s24le",
  "codec_long_name" :"PCM signed 24-bit little-endian",
  "codec_type" :"audio",
  "codec_time_base" :"1/48000",
  "codec_tag_string" :"[0][0][0][0]",
  "codec_tag" :"0x0000",
  "sample_fmt" :"s32",
  "sample_rate" :"48000",
  "channels":1,
  "bits_per_sample":24,
  "r_frame_rate" :"0/0",
  "avg_frame_rate" :"0/0",
  "time_base" :"1/48000",
  "start_pts":0,
  "start_time" :"0.000000",
  "duration_ts":860160,
  "duration" :"17.920000",
  "bit_rate" :"1152000",
  "bits_per_raw_sample" :"24",
  "disposition" :
  "default":0,
  "dub":0,
  "original":0,
  "comment":0,
  "lyrics":0,
  "karaoke":0,
  "forced":0,
  "hearing_impaired":0,
  "visual_impaired":0,
  "clean_effects":0,
  "attached_pic":0,
  "timed_thumbnails":0
  ,
  "tags" :
  "file_package_umid" :"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989"
  
  ,
  
  "index":2,
  "codec_name" :"pcm_s24le",
  "codec_long_name" :"PCM signed 24-bit little-endian",
  "codec_type" :"audio",
  "codec_time_base" :"1/48000",
  "codec_tag_string" :"[0][0][0][0]",
  "codec_tag" :"0x0000",
  "sample_fmt" :"s32",
  "sample_rate" :"48000",
  "channels":1,
  "bits_per_sample":24,
  "r_frame_rate" :"0/0",
  "avg_frame_rate" :"0/0",
  "time_base" :"1/48000",
  "start_pts":0,
  "start_time" :"0.000000",
  "duration_ts":860160,
  "duration" :"17.920000",
  "bit_rate" :"1152000",
  "bits_per_raw_sample" :"24",
  "disposition" :
  "default":0,
  "dub":0,
  "original":0,
  "comment":0,
  "lyrics":0,
  "karaoke":0,
  "forced":0,
  "hearing_impaired":0,
  "visual_impaired":0,
  "clean_effects":0,
  "attached_pic":0,
  "timed_thumbnails":0
  ,
  "tags" :
  "file_package_umid" :"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989"
  
  ,
  
  "index":3,
  "codec_name" :"pcm_s24le",
  "codec_long_name" :"PCM signed 24-bit little-endian",
  "codec_type" :"audio",
  "codec_time_base" :"1/48000",
  "codec_tag_string" :"[0][0][0][0]",
  "codec_tag" :"0x0000",
  "sample_fmt" :"s32",
  "sample_rate" :"48000",
  "channels":1,
  "bits_per_sample":24,
  "r_frame_rate" :"0/0",
  "avg_frame_rate" :"0/0",
  "time_base" :"1/48000",
  "start_pts":0,
  "start_time" :"0.000000",
  "duration_ts":860160,
  "duration" :"17.920000",
  "bit_rate" :"1152000",
  "bits_per_raw_sample" :"24",
  "disposition" :
  "default":0,
  "dub":0,
  "original":0,
  "comment":0,
  "lyrics":0,
  "karaoke":0,
  "forced":0,
  "hearing_impaired":0,
  "visual_impaired":0,
  "clean_effects":0,
  "attached_pic":0,
  "timed_thumbnails":0
  ,
  "tags" :
  "file_package_umid" :"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989"
  
  ,
  
  "index":4,
  "codec_name" :"pcm_s24le",
  "codec_long_name" :"PCM signed 24-bit little-endian",
  "codec_type" :"audio",
  "codec_time_base" :"1/48000",
  "codec_tag_string" :"[0][0][0][0]",
  "codec_tag" :"0x0000",
  "sample_fmt" :"s32",
  "sample_rate" :"48000",
  "channels":1,
  "bits_per_sample":24,
  "r_frame_rate" :"0/0",
  "avg_frame_rate" :"0/0",
  "time_base" :"1/48000",
  "start_pts":0,
  "start_time" :"0.000000",
  "duration_ts":860160,
  "duration" :"17.920000",
  "bit_rate" :"1152000",
  "bits_per_raw_sample" :"24",
  "disposition" :
  "default":0,
  "dub":0,
  "original":0,
  "comment":0,
  "lyrics":0,
  "karaoke":0,
  "forced":0,
  "hearing_impaired":0,
  "visual_impaired":0,
  "clean_effects":0,
  "attached_pic":0,
  "timed_thumbnails":0
  ,
  "tags" :
  "file_package_umid" :"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989"
  
  ,
  
  "index":5,
  "codec_name" :"pcm_s24le",
  "codec_long_name" :"PCM signed 24-bit little-endian",
  "codec_type" :"audio",
  "codec_time_base" :"1/48000",
  "codec_tag_string" :"[0][0][0][0]",
  "codec_tag" :"0x0000",
  "sample_fmt" :"s32",
  "sample_rate" :"48000",
  "channels":1,
  "bits_per_sample":24,
  "r_frame_rate" :"0/0",
  "avg_frame_rate" :"0/0",
  "time_base" :"1/48000",
  "start_pts":0,
  "start_time" :"0.000000",
  "duration_ts":860160,
  "duration" :"17.920000",
  "bit_rate" :"1152000",
  "bits_per_raw_sample" :"24",
  "disposition" :
  "default":0,
  "dub":0,
  "original":0,
  "comment":0,
  "lyrics":0,
  "karaoke":0,
  "forced":0,
  "hearing_impaired":0,
  "visual_impaired":0,
  "clean_effects":0,
  "attached_pic":0,
  "timed_thumbnails":0
  ,
  "tags" :
  "file_package_umid" :"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989"
  
  ,
  
  "index":6,
  "codec_name" :"pcm_s24le",
  "codec_long_name" :"PCM signed 24-bit little-endian",
  "codec_type" :"audio",
  "codec_time_base" :"1/48000",
  "codec_tag_string" :"[0][0][0][0]",
  "codec_tag" :"0x0000",
  "sample_fmt" :"s32",
  "sample_rate" :"48000",
  "channels":1,
  "bits_per_sample":24,
  "r_frame_rate" :"0/0",
  "avg_frame_rate" :"0/0",
  "time_base" :"1/48000",
  "start_pts":0,
  "start_time" :"0.000000",
  "duration_ts":860160,
  "duration" :"17.920000",
  "bit_rate" :"1152000",
  "bits_per_raw_sample" :"24",
  "disposition" :
  "default":0,
  "dub":0,
  "original":0,
  "comment":0,
  "lyrics":0,
  "karaoke":0,
  "forced":0,
  "hearing_impaired":0,
  "visual_impaired":0,
  "clean_effects":0,
  "attached_pic":0,
  "timed_thumbnails":0
  ,
  "tags" :
  "file_package_umid" :"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989"
  
  ,
  
  "index":7,
  "codec_name" :"pcm_s24le",
  "codec_long_name" :"PCM signed 24-bit little-endian",
  "codec_type" :"audio",
  "codec_time_base" :"1/48000",
  "codec_tag_string" :"[0][0][0][0]",
  "codec_tag" :"0x0000",
  "sample_fmt" :"s32",
  "sample_rate" :"48000",
  "channels":1,
  "bits_per_sample":24,
  "r_frame_rate" :"0/0",
  "avg_frame_rate" :"0/0",
  "time_base" :"1/48000",
  "start_pts":0,
  "start_time" :"0.000000",
  "duration_ts":860160,
  "duration" :"17.920000",
  "bit_rate" :"1152000",
  "bits_per_raw_sample" :"24",
  "disposition" :
  "default":0,
  "dub":0,
  "original":0,
  "comment":0,
  "lyrics":0,
  "karaoke":0,
  "forced":0,
  "hearing_impaired":0,
  "visual_impaired":0,
  "clean_effects":0,
  "attached_pic":0,
  "timed_thumbnails":0
  ,
  "tags" :
  "file_package_umid" :"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989"
  
  ,
  
  "index":8,
  "codec_name" :"pcm_s24le",
  "codec_long_name" :"PCM signed 24-bit little-endian",
  "codec_type" :"audio",
  "codec_time_base" :"1/48000",
  "codec_tag_string" :"[0][0][0][0]",
  "codec_tag" :"0x0000",
  "sample_fmt" :"s32",
  "sample_rate" :"48000",
  "channels":1,
  "bits_per_sample":24,
  "r_frame_rate" :"0/0",
  "avg_frame_rate" :"0/0",
  "time_base" :"1/48000",
  "start_pts":0,
  "start_time" :"0.000000",
  "duration_ts":860160,
  "duration" :"17.920000",
  "bit_rate" :"1152000",
  "bits_per_raw_sample" :"24",
  "disposition" :
  "default":0,
  "dub":0,
  "original":0,
  "comment":0,
  "lyrics":0,
  "karaoke":0,
  "forced":0,
  "hearing_impaired":0,
  "visual_impaired":0,
  "clean_effects":0,
  "attached_pic":0,
  "timed_thumbnails":0
  ,
  "tags" :
  "file_package_umid" :"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989"
  
  
  ],
  "format" :
  "filename" :"/media-caches/video-essence/VIDEO/MXF-XDCAM_HD422@50Mbps1080i25_16Ch/941.mxf",
  "nb_streams":9,
  "nb_programs":0,
  "format_name" :"mxf",
  "format_long_name" :"MXF (Material eXchange Format)",
  "start_time" :"0.000000",
  "duration" :"17.920000",
  "size" :"135028296",
  "bit_rate" :"60280489",
  "probe_score":100,
  "tags" :
  "uid" :"0a9ef41a-36b4-4066-a8a3-b95f62299b6c",
  "generation_uid" :"e134647e-fea1-4673-91c1-afa277d13c00",
  "company_name" :"Sony",
  "product_name" :"MPC",
  "product_version" :"v1.0",
  "application_platform" :"Sony MXF Development Kit (Win32)",
  "product_uid" :"060e2b34-0401-0103-0e06-0120027f0200",
  "modification_date" :"2012-09-17T11:56:20.000000Z",
  "material_package_umid" :"0x060A2B340101010501010D231300000081C32F48A63347D4890F55D3ADC25B99",
  "timecode" :"00:35:30:08"