0

I have 40 .jpg in my dir folder and want to create a video at 20fps from them. I've tried the following command:

find dir/ -iname '*.jpg' | xargs cat | ffmpeg -f image2pipe -framerate 20 -i - -s 1080x720 -pix_fmt yuv420p out.mkv

I expect to obtain a 2 seconds video (40 images / 20 fps) but I get a 6 seconds video. Here is the output of ffmpeg:

[image2pipe @ 0x564d225dd940] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, image2pipe, from 'pipe:':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: mjpeg (Baseline), yuvj422p(pc, bt470bg/unknown/unknown), 6000x4000, 20 fps, 20 tbr, 20 tbn, 20 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
[swscaler @ 0x564d22b94b00] deprecated pixel format used, make sure you did set range correctly
[libx264 @ 0x564d225e3180] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x564d225e3180] profile High, level 3.1, 4:2:0, 8-bit
[libx264 @ 0x564d225e3180] 264 - core 161 r3039 544c61f - H.264/MPEG-4 AVC codec - Copyleft 2003-2021 - 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=20 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, matroska, to 'out.mkv':
  Metadata:
    encoder         : Lavf58.76.100
  Stream #0:0: Video: h264 (H264 / 0x34363248), yuv420p(tv, bt470bg/unknown/unknown, progressive), 1080x720, q=2-31, 20 fps, 1k tbn
    Metadata:
      encoder         : Lavc58.134.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame=    1 fps=0.0 q=0.0 size=       1kB time=00:00:00.00 bitrate=N/A speed=   0x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 3 times
frame=    5 fps=0.0 q=0.0 size=       1kB time=00:00:00.00 bitrate=N/A speed=   0x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 5 times
frame=   11 fps=9.9 q=0.0 size=       1kB time=00:00:00.00 bitrate=N/A speed=   0x    
[swscaler @ 0x564d237e33c0] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 4 times
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
frame=   17 fps= 10 q=0.0 size=       1kB time=00:00:00.00 bitrate=N/A speed=   0x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 5 times
frame=   23 fps= 10 q=0.0 size=       1kB time=00:00:00.00 bitrate=N/A speed=   0x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 4 times
[swscaler @ 0x564d247610c0] deprecated pixel format used, make sure you did set range correctly
frame=   29 fps= 10 q=0.0 size=       1kB time=00:00:00.00 bitrate=N/A speed=   0x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 5 times
frame=   35 fps= 10 q=0.0 size=       1kB time=00:00:00.00 bitrate=N/A speed=   0x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 1 times
[swscaler @ 0x564d26bb8f80] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 2 times
frame=   41 fps= 10 q=0.0 size=       1kB time=00:00:00.00 bitrate=N/A speed=   0x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 5 times
frame=   47 fps=9.9 q=0.0 size=       1kB time=00:00:00.00 bitrate=N/A speed=   0x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 5 times
frame=   53 fps=9.8 q=28.0 size=       1kB time=00:00:00.00 bitrate=5024.0kbits/s speed=0.000184x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 5 times
frame=   59 fps=9.7 q=28.0 size=       1kB time=00:00:00.30 bitrate=  16.7kbits/s speed=0.0496x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 5 times
frame=   65 fps=9.7 q=28.0 size=       1kB time=00:00:00.60 bitrate=   8.4kbits/s speed=0.0894x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 5 times
frame=   71 fps=9.7 q=28.0 size=       1kB time=00:00:00.90 bitrate=   5.6kbits/s speed=0.123x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 5 times
frame=   77 fps=9.7 q=28.0 size=       1kB time=00:00:01.20 bitrate=   4.2kbits/s speed=0.151x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 5 times
frame=   83 fps=9.7 q=28.0 size=       1kB time=00:00:01.50 bitrate=   3.3kbits/s speed=0.175x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 5 times
frame=   89 fps=9.7 q=28.0 size=       1kB time=00:00:01.80 bitrate=   2.8kbits/s speed=0.196x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 5 times
frame=   95 fps=9.7 q=28.0 size=       1kB time=00:00:02.10 bitrate=   2.4kbits/s speed=0.213x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 5 times
frame=  101 fps=9.7 q=28.0 size=       1kB time=00:00:02.40 bitrate=   2.1kbits/s speed=0.23x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 5 times
frame=  107 fps=9.7 q=28.0 size=       1kB time=00:00:02.70 bitrate=   1.9kbits/s speed=0.244x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 5 times
frame=  113 fps=9.7 q=28.0 size=       1kB time=00:00:03.00 bitrate=   1.7kbits/s speed=0.258x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 5 times
frame=  119 fps=9.7 q=28.0 size=       1kB time=00:00:03.30 bitrate=   1.5kbits/s speed=0.269x    
[swscaler @ 0x564d22d76680] deprecated pixel format used, make sure you did set range correctly
frame=  120 fps=8.6 q=-1.0 Lsize=    1338kB time=00:00:05.85 bitrate=1873.8kbits/s speed=0.419x    
video:1337kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.115425%
[libx264 @ 0x564d225e3180] frame I:2     Avg QP:22.50  size: 53106
[libx264 @ 0x564d225e3180] frame P:40    Avg QP:23.81  size: 17895
[libx264 @ 0x564d225e3180] frame B:78    Avg QP:26.09  size:  7002
[libx264 @ 0x564d225e3180] consecutive B-frames:  1.7% 16.7% 55.0% 26.7%
[libx264 @ 0x564d225e3180] mb I  I16..4:  7.6% 74.5% 17.9%
[libx264 @ 0x564d225e3180] mb P  I16..4:  2.0% 12.3%  2.5%  P16..4: 43.7% 12.6%  5.6%  0.0%  0.0%    skip:21.3%
[libx264 @ 0x564d225e3180] mb B  I16..4:  0.8%  3.1%  0.4%  B16..8: 35.0%  2.9%  0.5%  direct: 3.7%  skip:53.5%  L0:35.9% L1:61.7% BI: 2.4%
[libx264 @ 0x564d225e3180] 8x8 transform intra:72.9% inter:80.7%
[libx264 @ 0x564d225e3180] coded y,uvDC,uvAC intra: 63.5% 86.3% 57.4% inter: 14.6% 31.4% 3.4%
[libx264 @ 0x564d225e3180] i16 v,h,dc,p: 27% 24% 10% 38%
[libx264 @ 0x564d225e3180] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 16% 16%  7% 10% 10%  9%  8%  8%
[libx264 @ 0x564d225e3180] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 16% 13%  7% 12% 10% 10%  7%  5%
[libx264 @ 0x564d225e3180] i8c dc,h,v,p: 45% 23% 21% 12%
[libx264 @ 0x564d225e3180] Weighted P-Frames: Y:52.5% UV:50.0%
[libx264 @ 0x564d225e3180] ref P L0: 49.9% 20.3% 12.0%  9.1%  8.7%
[libx264 @ 0x564d225e3180] ref B L0: 74.9% 17.1%  8.0%
[libx264 @ 0x564d225e3180] ref B L1: 97.6%  2.4%
[libx264 @ 0x564d225e3180] kb/s:1824.23

Here is some info about the out.mkv file:

Format                                   : Matroska
Format version                           : Version 4
File size                                : 850 KiB
Duration                                 : 6 s 0 ms
Overall bit rate                         : 1 160 kb/s
...
Format settings, Reference frames        : 4 frames
Codec ID                                 : V_MPEG4/ISO/AVC
Duration                                 : 6 s 0 ms
Bit rate                                 : 1 137 kb/s
Width                                    : 1 080 pixels
Height                                   : 720 pixels
Display aspect ratio                     : 3:2
Frame rate mode                          : Constant
Frame rate                               : 20.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.073

I've tried different strategies with the -r option, but I cannot get my 2 seconds video at 20 fps. Can you see what going on?

Also I would like to keep a image2pipe solution instead of a image2 solution.

2
  • 1
    Share full log.
    – Gyan
    Sep 19, 2021 at 4:07
  • @Gyan I edited the post with the full ffmpeg log Sep 19, 2021 at 14:46

1 Answer 1

0

you have to specify both an input and an output framerate, right now you are only setting the input framerate. Try

find dir/ -iname '*.jpg' | xargs cat | ffmpeg -f image2pipe -r 20 -i - -s 1080x720 -r 20 -pix_fmt yuv420p out.mkv

hope this works

1
  • I still obtain a 6 seconds video with your command Nov 6, 2021 at 13:50

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.