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• FFMpeg video stopmotion

  22 juillet 2020, par Praveen Tamil

  I would like to create stop motion video from original video.
The logic is take frame at specified interval. 
And play the video with specified playback rate.

  



  For example,
  
The original video duration is 114.048 seconds.
  
The output video playback rate 5 times faster than source video.
  
Take each frame at the interval of 1 seconds. so the final video duration should be (22.81 = 114.048/1*0.2) seconds

  



  Below is the screenshot of demo

  



  For this I need ffmpeg code

  



  ffmpeg -r 1 -i D:\21-03-2018\15305154945b39d026a18da.mp4 D:\21-03-2018\output.mp4

  


• HLS-streaming on VLC - cookies alternative

  5 juillet 2018, par unicornslayer

  I’m trying to build a streaming web api which creates m3u8 playlists of .ts files in .net core.

  I’ve built the live streaming option and it works fine on vlc.

  For example, in VLC -> File -> Open Network put my link : http://localhost:39986/api/Stream/MyChannel/index.m3u8 and VLC gives me the live version of the channel.

  But I need to implement the option of starting a video from a fixed time : http://localhost:39986/api/Stream/MyChannel/index.m3u8?timeStr="2018-07-04T17:16:01". In this case, I would need to create a session to know from which point to create the playlist, right ?[1]

  If so, sessions require an ID stored as a Cookie (right ?[2]). But from what I’ve read and what I’ve tested, vlc doesn’t support cookies.

  So my question is : is there any workaround for this scenario ?[3]

  It’s an university project and I am very confused about this task.

• ffmpeg image sequence from text file not rendering correctly

  4 juillet 2018, par Rich

  I’ve been working with ffmpeg and I have got it to work perfectly quite a few times, but as of recent I am running into an issue where all the images from my text file arent used.

  My text file looks like -

  ffconcat version 1.0
  
  file 'gallery-house-77-west-55th-street-01.jpg'
  
  duration 4.44
  
  file 'img03.jpg'
  
  duration 4.44
  
  file 'inside.png'
  
  duration 4.44
  
  file 'placeholder.png'

  (amount of files, file names and extensions will always vary)

  And I’ve tried several combinations but as of now my ffmpeg function looks like —

  ffmpeg -i audio.mp3 -safe 0 -f concat -i paths.txt -c:a copy -c:v libx264 \
  
  -vf "scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,fps=25,format=yuv420p" -vsync vfr -movflags +faststart -y output.mp4 2>&1');

  When trying to run it, the video seems to convert but has various weird behaviors - sometimes only the middle file(image) in the list is shown or the first 2 only are shown/rendered.

  The audio is playing correctly though.

  I’ve tried setting the framerate for the input and I also tried setting it for the output but it leads to more strange behavior.

  This is what is echoed when running my above ffmpeg command -

   libavutil      56. 15.100 / 56. 15.100
  
    libavcodec     58. 19.100 / 58. 19.100
  
    libavformat    58. 13.100 / 58. 13.100
  
    libavdevice    58.  4.100 / 58.  4.100
  
    libavfilter     7. 18.100 /  7. 18.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
    libpostproc    55.  2.100 / 55.  2.100
  
  [mp3 @ 0xb46780] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, mp3, from 'audio.mp3':
  
    Metadata:
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:19.98, start: 0.000000, bitrate: 48 kb/s
  
      Stream #0:0: Audio: mp3, 22050 Hz, mono, fltp, 48 kb/s
  
  Input #1, concat, from 'paths.txt':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #1:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 754x424 [SAR 72:72 DAR 377:212], 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #1:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
  
    Stream #0:0 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0xba25c0] deprecated pixel format used, make sure you did set range correctly
  
  [libx264 @ 0xb710c0] using SAR=3393/3392
  
  [libx264 @ 0xb710c0] using cpu capabilities: none!
  
  [libx264 @ 0xb710c0] profile High, level 3.1
  
  [libx264 @ 0xb710c0] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=22 lookahead_threads=3 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:
  
      encoder         : Lavf58.13.100
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 3393:3392 DAR 377:212], q=-1--1, 25 fps, 12800 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc58.19.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: mp3 (mp4a / 0x6134706D), 22050 Hz, mono, fltp, 48 kb/s
  
  [swscaler @ 0xb93140] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 0xb93140] Warning: data is not aligned! This can lead to a speed loss
  
  [mjpeg @ 0xb6e200] mjpeg: unsupported coding type (cd)
  
  [mjpeg @ 0xb6e200] mjpeg: unsupported coding type (c8)
  
  [mjpeg @ 0xb6e200] Found EOI before any SOF, ignoring
  
  [mjpeg @ 0xb6e200] mjpeg: unsupported coding type (c7)
  
  Error while decoding stream #1:0: Invalid data found when processing input
  
  [mjpeg @ 0xb6e200] invalid id 94
  
  Error while decoding stream #1:0: Invalid data found when processing input
  
  [mp4 @ 0xb6f8c0] Starting second pass: moving the moov atom to the beginning of the file
  
  frame=    1 fps=0.0 q=28.0 Lsize=     179kB time=00:00:19.95 bitrate=  73.6kbits/s speed=44.1x    
  
  video:58kB audio:117kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.446521%
  
  [libx264 @ 0xb710c0] frame I:1     Avg QP:28.86  size: 58683
  
  [libx264 @ 0xb710c0] mb I  I16..4: 21.2% 59.8% 19.0%
  
  [libx264 @ 0xb710c0] 8x8 transform intra:59.8%
  
  [libx264 @ 0xb710c0] coded y,uvDC,uvAC intra: 50.5% 65.2% 31.6%
  
  [libx264 @ 0xb710c0] i16 v,h,dc,p: 10% 60%  3% 28%
  
  [libx264 @ 0xb710c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 27% 26%  4%  4%  4%  6%  4%  7%
  
  [libx264 @ 0xb710c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 33% 10%  5%  6%  5%  8%  5%  7%
  
  [libx264 @ 0xb710c0] i8c dc,h,v,p: 47% 34% 11%  8%
  
  [libx264 @ 0xb710c0] kb/s:11736.60

  Any ideas whats causing the image sequence to fail ?

  EDIT

  After some more debugging I think it may be related to the fact that all the files dont have the same extension. How can I make it so that it doesn’t have to be that way or is that already a default setting and the issue is else where ?