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• Cropping black bars in video with ffmpeg on ubuntu changes video size

  9 décembre 2013, par pramod

  I have a source video size that's 720x576 with black rectangles on the top and bottom.

  I want to remove the black rectangles and set the output video size to 640x352.

  I tried -vf cropdetect and the value it gave was 640:192:0:80.

  However, putting that same value in crop=<parameter></parameter> changes the output video size.

  How can I fix this ?

  E.g. :

  ffmpeg -i all_the_best_test.mpg -s 640x352 -deinterlace -b 500k -minrate 500k \
  
  -maxrate 500k -aspect 1.82 -force_fps -vcodec libx264 -me_method 10 \
  
  -vf crop=640:192:0:80 -r 25 -acodec libfaac -ac 2 -ar 44100 -ab 96k -subq 6 \
  
  -vpre medium /vod/Movies/final/allthebest-crop-2.mp4

• How to download videos from m3u8 that has sample-aes encryption [closed]

  8 mai 2021, par Rajat Bisht

  I am trying to download my online lecture from m3u8 link but it shows "ffmpeg do not support sample-aes yet".
Link of lecture : https://pw.pc.cdn.bitgravity.com/b7826d86-612d-4ef2-b17c-cc4f91d9584c/master.m3u8 .
It is sample-aes-ctr encrypted. Also I know python a little bit so it would be better if I could download it using python. Also I have link to mpd file : https://pw.pc.cdn.bitgravity.com/b7826d86-612d-4ef2-b17c-cc4f91d9584c/master.mpd.
Please can anyone tell any module or something which can help in downloading it.....
Thanks in advance.

  


• ffmpeg - less frames getting extracted than expected

  20 juin 2021, par Vrajesh Doshi

  


  ffmpeg -i instagram.mp4 -vf fps=29.97 thumb%06d.jpg -hide_banner

  
 


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'instagram.mp4' : Metadata :
 major_brand : isom
 minor_version : 512
 compatible_brands : isomiso2avc1mp41
 encoder : Lavf55.19.104 Duration : 00:00:13.61, start : 0.000000, bitrate : 1163 kb/s
 Stream #0:0(und) : Video : h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x640 [SAR 1:1 DAR 1:1], 1099 kb/s, 29.97 fps,
 29.97 tbr, 11988 tbn, 59.94 tbc (default)
 Metadata :
 handler_name : VideoHandler
 Stream #0:1(und) : Audio : aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 64 kb/s (default)
 Metadata :
 handler_name : SoundHandler Stream mapping : Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native)) Press [q] to stop, [?] for help [swscaler @ 0x55b2b53cf440] deprecated pixel format used, make sure
 you did set range correctly Output #0, image2, to 'thumb%06d.jpg' :
  
 Metadata :
 major_brand : isom
 minor_version : 512
 compatible_brands : isomiso2avc1mp41
 encoder : Lavf57.83.100
 Stream #0:0(und) : Video : mjpeg, yuvj420p(pc), 640x640 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 29.97 fps, 29.97 tbn, 29.97 tbc (default)
 Metadata :
 handler_name : VideoHandler
 encoder : Lavc57.107.100 mjpeg
 Side data :
 cpb : bitrate max/min/avg : 0/0/200000 buffer size : 0 vbv_delay : -1 frame= 405 fps=231 q=24.8 Lsize=N/A time=00:00:13.51 bitrate=N/A speed=7.72x video:5961kB audio:0kB subtitle:0kB other streams:0kB
 global headers:0kB muxing overhead : unknown

  


  



  The video duration is 13.61 seconds and frame rate is 29.97. So I was expecting 13.61 * 29.97 = 407.8917 i.e. 407 frames. But have got 405 frames. I am new to ffmpeg, need help to correctly get all 407 frames.

  



  I had also tried following command,

  



  ffmpeg -i instagram.mp4 thumb%06d.jpg -hide_banner


  



  but the output was same 405 frames.

  



  Possibly the start 2 frames are missing.

  



  I need to display the frames generated in the base video timeline. And on clicking on the frame I need to exactly seek the video to the frame position using HTML5 currentTime. Since the first 2 frames are not getting available, exact mapping is not getting possible.

  



  Please guide.