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• Concatenate multiple videos with a black screen loop into one video

  23 février 2020, par Marcel

  I am using ffmpeg to join a bunch of videos together.
  I am using the classic join ffmpeg code :
  

  ffmpeg -f concat -i joinlist.txt -c copy joinedfile.mp4

  but the problem is that the videos are of different formats, encodings, but the same size : all 640x480. I want to join them all and put a black screen video with no sound every other video :

  video1 + black_screen_video + video2 + black_screen_video + video3 ...

  I generated a black screen video of 2 seconds duration using :

  ffmpeg -f lavfi -i color=c=black:s=640x480:d=2 black_screen_video.mp4

  so all of the videos are of the same size : 640x480, and 25 fps but different codecs. The videos have sound, except for the black screen video.
  I can’t do anything manual, because the number of videos are around several hundred. So it has got to be an automatic way to do all this.

  When I joined them together using the above code, the resulting video does not play correctly at all.

  I know that I have to re-encode them, but how to do this to all these videos at once, with one line of code ?

  Update :
  I am already using with success this code to join them together, but only three, if I have more than one hundred, it is time consuming to write down one by one :

  ffmpeg -i vid1.avi -i vid2.avi -i vid3.avi -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] [2:v:0] [2:a:0] concat=n=3:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" output.mp4

  but this is joining only the videos, not looping the black screen video. When I do with black screen, ffmpeg gives me stream matching errors.

  update :

  here is the console image :
  

  2nd update :

  a very long list of errors in red, of which a screenshot here :
  

• ffmpeg command produces black image as output

  3 mars 2020, par Nishad DESHMUKH

  Input #0, video4linux2,v4l2, from ’/dev/video0’ :

  Duration : N/A, start : 13555.753906, bitrate : 147456 kb/s

  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc

  Stream mapping :

  Stream #0:0 -> #0:0 (rawvideo (native) -> mjpeg (native))

  Press [q] to stop, [?] for help
  [swscaler @ 0x55fd0eafa3e0] deprecated pixel format used, make sure you did set range correctly
  Output #0, image2, to ’test1.jpeg’ :

  Metadata :

  encoder         : Lavf57.83.100
  
  
  
  Stream #0:0: Video: mjpeg, yuvj422p(pc), 640x480, q=2-31, 200 kb/s, 30 fps, 30 tbn, 30 tbc
  
  
  
  Metadata:
  
  
  
    encoder         : Lavc57.107.100 mjpeg
  
  
  
  Side data:
  
  
  
    cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1

  frame= 1 fps=0.0 q=1.6 Lsize=N/A time=00:00:00.03 bitrate=N/A speed=8.41x

  video:3kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : unknown

• How to add black frames and keep the framerate ?

  3 mars 2020, par Patryk

  I have a black image from which I generate videos filled with black color only for specified lengths that I can then concatenate with my destination videos. This is how I produce it :

  ffmpeg -loop 1 -i black.png -t 00:00:00.066 \ 
  
      -c:v libx264 -pix_fmt yuv420p -vf scale=840:480,fps=15 out66ms.mp4

  with the following ffmpeg output :

  Input #0, png_pipe, from 'black.png':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: png, rgba(pc), 608x342 [SAR 5669:5669 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x7fadf3826e00] using SAR=64/63
  
  [libx264 @ 0x7fadf3826e00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 0x7fadf3826e00] profile High, level 3.0
  
  [libx264 @ 0x7fadf3826e00] 264 - core 155 r2917 0a84d98 - 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=12 lookahead_threads=2 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=15 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 'out66ms.mp4':
  
    Metadata:
  
      encoder         : Lavf58.29.100
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 840x480 [SAR 64:63 DAR 16:9], q=-1--1, 15 fps, 15360 tbn, 15 tbc
  
      Metadata:
  
        encoder         : Lavc58.54.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  frame=    1 fps=0.0 q=27.0 Lsize=       2kB time=00:00:00.00 bitrate=201107.7kbits/s speed=0.0031x
  
  video:1kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 100.984009%
  
  [libx264 @ 0x7fadf3826e00] frame I:1     Avg QP:12.00  size:   123
  
  [libx264 @ 0x7fadf3826e00] mb I  I16..4: 100.0%  0.0%  0.0%
  
  [libx264 @ 0x7fadf3826e00] 8x8 transform intra:0.0%
  
  [libx264 @ 0x7fadf3826e00] coded y,uvDC,uvAC intra: 0.0% 0.0% 0.0%
  
  [libx264 @ 0x7fadf3826e00] i16 v,h,dc,p: 97%  0%  3%  0%
  
  [libx264 @ 0x7fadf3826e00] i8c dc,h,v,p: 100%  0%  0%  0%
  
  [libx264 @ 0x7fadf3826e00] kb/s:14.76

  I’d like to then concatenate it with videos like this one :

  ffprobe file.ts
  
  Input #0, mpegts, from 'file.ts':
  
    Duration: 00:00:06.67, start: 0.000000, bitrate: 1090 kb/s
  
    Program 1
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0:0[0x100]: Video: h264 (Baseline) ([27][0][0][0] / 0x001B), yuv420p(progressive), 864x480, 90k tbr, 90k tbn, 180k tbc

  but as soon as I concatenate it using concat demuxer like that :

  ffmpeg -y -hide_banner \
  
      -f concat -safe 0 \
  
      -i <(echo "file '$PWD/out66ms.mp4'"; for f in dir/*.ts; do echo "file '$PWD/$f'"; done) \
  
      -c copy \
  
      output.mp

  I get this :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.29.100
  
    Duration: 00:01:41.38, start: 0.000000, bitrate: 170 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 840x480 [SAR 64:63 DAR 16:9], 170 kb/s, 2.67 fps, 2.67 tbr, 15360 tbn, 30 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler

  Which has 2.67 fps whereas not adding this empty black video to concatenation gives the following (desired 15 fps) :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.29.100
  
    Duration: 00:00:17.29, start: 0.000000, bitrate: 1001 kb/s
  
      Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 864x480, 999 kb/s, 15.62 fps, 15.58 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler

  EDIT

  I’ve tried reencoding instead of copying :

  ffmpeg -y -hide_banner \
  
      -f concat -safe 0 \
  
      -i <(echo "file '$PWD/out66ms.mp4'"; for f in dir/*.ts; do echo "file '$PWD/$f'"; done) \
  
      -c:v libx264 -vf scale=840:480,fps=15 \
  
      output.mp

  But I get a similar result :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.29.100
  
    Duration: 00:01:41.00, start: 0.000000, bitrate: 555 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1680x480 [SAR 64:63 DAR 32:9], 554 kb/s, 15 fps, 15 tbr, 15360 tbn, 30 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler

  even though that the fps is set properly the video is too long and slowed down.

  How to properly add those black filled videos to preserve fps or set it to desired value ?