[FFmpeg-user] concatenate png files for different durations?

Spencer Graves spencer.graves at prodsyse.com
Sun Mar 16 23:48:10 CET 2014 

On 3/16/2014 2:45 PM, Lou wrote:
> On Sun, 16 Mar 2014 14:35:54 -0700
> Spencer Graves <spencer.graves at prodsyse.com> wrote:
>
>>         Thanks for the reply.  Unfortunately, I've been unable so far to
>> make it work.  Consider the following:
>>
>>
>>   >ffmpeg -y concat -i concat1.txt tst2e.mp4
> Your forgot -f as in:
>
> ffmpeg -y -f concat -i concat1.txt tst2e.mp4


       Thanks.  That got me past that stupidity.


       Now I'm back with my original problem:  I'm unable to control the 
duration of the individual images.  Attached is a toy example, 34 KB 
total, that is supposed to play the images as follows:


file tst0.png
duration 1
file tst1.png
duration 6
file tst2.png
duration 1
file tst3.png
duration 3
file tst4.png
duration 1


       However, tst0 plays for less than a second, tst1 plays for ~1 
second (not 6 as requested), tst2 plays for ~5 seconds (not 1), tst3 
plays for ~1 second (not 3), and tst4 runs ~2 seconds, not 1 (on my 
Windows 7 machine).  Below please find the command that produced the 
attached tst2g.mp4 using "concat3.txt" containing the above 
file-duration specifications.


       Suggestions?


       Spencer


p.s.  Thanks again very much for the help.  Beyond this toy example, I 
currently plan to produce 1500 png files and mate them with a 60-second 
mp2 audio file at 25 frames per second.  If ffmpeg has problems with a 
few frames at the beginning and end, the result may not be noticeable.  
However, if there is too much variability in the time devoted to each 
frame (apart from a few at the start and end), I will have more problems 
to solve.


 >ffmpeg -y -f concat -i concat3.txt -pix_fmt yuv420p tst2g.mp4
ffmpeg version N-61163-gd1122b7 Copyright (c) 2000-2014 the FFmpeg 
developers
   built on Mar  7 2014 22:01:29 with gcc 4.8.2 (GCC)
   configuration: --enable-gpl --enable-version3 --disable-w32threads 
--enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r 
--enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca 
--enable-libfreetyp
e --enable-libgsm --enable-libilbc --enable-libmodplug 
--enable-libmp3lame --ena
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg 
--enable-l
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr 
--enable-libsp
eex --enable-libtheora --enable-libtwolame --enable-libvidstab 
--enable-libvo-aa
cenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx 
--enable-libwavp
ack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid 
--enable
-zlib
   libavutil      52. 66.101 / 52. 66.101
   libavcodec     55. 52.102 / 55. 52.102
   libavformat    55. 33.101 / 55. 33.101
   libavdevice    55. 11.100 / 55. 11.100
   libavfilter     4.  3.100 /  4.  3.100
   libswscale      2.  5.101 /  2.  5.101
   libswresample   0. 18.100 /  0. 18.100
   libpostproc    52.  3.100 / 52.  3.100
Input #0, concat, from 'concat3.txt':
   Duration: 00:00:12.00, start: 0.000000, bitrate: 0 kb/s
     Stream #0:0: Video: png, pal8, 480x480, 25 tbr, 25 tbn, 25 tbc
[libx264 @ 045be100] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 045be100] profile High, level 3.0
[libx264 @ 045be100] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC 
codec - Cop
yleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 
ref=3 deb
lock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 
mixed_ref=1 m
e_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 
fast_pskip=1 chro
ma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 
decimate=1 i
nterlaced=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 scenec
ut=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 'tst2g.mp4':
   Metadata:
     encoder         : Lavf55.33.101
     Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), 
yuv420p, 480x48
0, q=-1--1, 12800 tbn, 25 tbc
Stream mapping:
   Stream #0:0 -> #0:0 (png -> libx264)
Press [q] to stop, [?] for help
frame=  276 fps=0.0 q=-1.0 Lsize=      16kB time=00:00:10.96 bitrate=  
12.3kbits
/s dup=271 drop=0
video:12kB audio:0kB subtitle:0 data:0 global headers:0kB muxing 
overhead 32.223
881%
[libx264 @ 045be100] frame I:2     Avg QP:20.30  size:  2128
[libx264 @ 045be100] frame P:70    Avg QP:10.40  size:    44
[libx264 @ 045be100] frame B:204   Avg QP:12.67  size:    23
[libx264 @ 045be100] consecutive B-frames:  1.4%  0.0%  0.0% 98.6%
[libx264 @ 045be100] mb I  I16..4: 21.0% 74.2%  4.8%
[libx264 @ 045be100] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.0% 
0.0%  0.0%
  0.0%  0.0%    skip:99.9%
[libx264 @ 045be100] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.3% 
0.0%  0.0%
  direct: 0.0%  skip:99.7%  L0:69.7% L1:30.3% BI: 0.0%
[libx264 @ 045be100] 8x8 transform intra:73.8% inter:0.0%
[libx264 @ 045be100] coded y,uvDC,uvAC intra: 2.8% 2.7% 2.6% inter: 0.0% 
0.0% 0.
0%
[libx264 @ 045be100] i16 v,h,dc,p: 54% 31% 16%  0%
[libx264 @ 045be100] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 78%  7% 16%  0% 0%  
0%  0%
  0%  0%
[libx264 @ 045be100] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 51% 22% 16%  1% 1%  
2%  2%
  1%  2%
[libx264 @ 045be100] i8c dc,h,v,p: 97%  1%  1%  0%
[libx264 @ 045be100] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 045be100] ref P L0: 74.0%  2.0% 24.0%
[libx264 @ 045be100] ref B L0: 33.0% 67.0%
[libx264 @ 045be100] kb/s:8.70

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-- 
Spencer Graves, PE, PhD
President and Chief Technology Officer
Structure Inspection and Monitoring, Inc.
751 Emerson Ct.
San José, CA 95126
ph:  408-655-4567
web:  www.structuremonitoring.com

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