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• Where to find old ffmpeg/ffprobe documentation ?

  5 mars 2019, par Multihunter

  There are several different versions of ffmpeg and ffprobe flying around, and each version has a different API.

  If I apt-get install ffmpeg on Ubuntu 16.04, I get ffmpeg version 2.8.15-0ubuntu0.16.04.1. If I install apt-get install ffmpeg on Ubuntu 18.04, I get version 3.4.4-0ubuntu0.18.04.1.

  When I visit the ffmpeg documentation, it says "The following documentation is regenerated nightly, and corresponds to the newest FFmpeg revision. Consult your locally installed documentation for older versions." That is, the hosted documentation is neither of those two versions.

  So I have two questions :

  • What does it mean "your locally installed documentation" ? Is it only talking about man ffmpeg ? Or is there some way to host the documentation as a webpage ?
  • Are there any places that simply host the older versions of the ffmpeg documentation ?

• ffmpeg concat vidoes Could not find codec parameters for stream 1

  25 février 2017, par Moji

  I’m trying to concat 3 vidoes, each is converted to mpg beforehand, when I run the command to concat, it gives me this error (But still produces the output with no audio)

  Could not find codec parameters for stream 1 (Audio: mp2, 0 channels): unspecified frame size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize'  options
  
  Input #0, mpeg, from 'concat:intermediate1.mpg|intermediate2.mpg|intermediate3.mpg':
  
  Duration: 00:00:25.73, start: 0.540000, bitrate: 2626 kb/s
  
  Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p(tv), 480x414 [SAR 1:1 DAR 80:69], 104857 kb/s, 25 fps, 25 tbr, 90k tbn, 25 tbc
  
  Stream #0:1[0x1c0]: Audio: mp2, 0 channels
  
  [mpeg @ 0000000002766ba0] VBV buffer size not set, using default size of 130KB
  
  If you want the mpeg file to be compliant to some specification
  
  Like DVD, VCD or others, make sure you set the correct buffer size
  
  Output #0, mpeg, to 'intermediate_all.mpg':
  
  Metadata:
  
  encoder  : Lavf57.50.100
  
  Stream #0:0: Video: mpeg1video, yuv420p(tv), 480x414 [SAR 1:1 DAR 80:69], q=2-31, 104857 kb/s, 25 fps, 25 tbr, 90k tbn, 25 tbc
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  [mpeg @ 0000000002766ba0] Timestamps are unset in a packet for stream 0.  This is deprecated and will stop working in the future. Fix your code to set the   timestamps properly
  
  frame= 1151 fps=0.0 q=-1.0 Lsize=    7834kB time=00:00:40.81  bitrate=1572.5kbits/s speed= 346x
  
  video:7792kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.535638%

  First and third videos are made by just one picture (first one 10 second and the third 5 second long) and there is no audio for them.
  the Second video which has Audio, is converted to mpg from mov by running this command :

  -i test.mov -qscale:v 1 -y intermediate2.mpg

  And I’m using this command to merge them all together :

  -i concat:\"intermediate1.mpg|intermediate2.mpg|intermediate3.mpg\" -c copy -y intermediate_all.mpg

  the final output "intermediate_all.mpg" has no audio at all.

  I also tried putting ’analyzeduration’ and ’probesize’ to value 100M, yet didn’t work.

  Anything I’m doing wrong here ?

• C program cannot find function which included in header file

  17 juin 2013, par Juneyoung Oh

  I made program like this.

    1 #include 
  
    2 #include 
  
    3 #include 
  
    4 #include "libavformat/avformat.h"
  
    5 
  
    6 int main (int argc, char* argv[]){
  
    7         av_register_all();
  
    8         return 0;
  
    9 }

  My header file located in

  root@ubuntu:/home/juneyoungoh/getDuration# find / -name "avformat.h"
  
  /root/ffmpeg/libavformat/avformat.h
  
  /usr/local/include/libavformat/avformat.h

  then I run with gcc getDuration.c , but I show message like below.

  root@ubuntu:/home/juneyoungoh/getDuration# gcc getDuration.c 
  
  /tmp/ccwjonqH.o: In function `main':
  
  getDuration.c:(.text+0x10): undefined reference to `av_register_all'
  
  collect2: ld returned 1 exit status

  Frankly, I do not have any idea what makes this.

  Thanks for your answers.

  ========================== edited #1 ===========================

  when I "ls /usr/local/lib", I get this.

  root@ubuntu:/home/juneyoungoh/getDuration# ls /usr/local/lib/
  
  libavcodec.a   libavutil.a    libopus.la       libvpx.a   python2.7
  
  libavdevice.a  libfdk-aac.a   libpostproc.a    libx264.a
  
  libavfilter.a  libfdk-aac.la  libswresample.a  libyasm.a
  
  libavformat.a  libopus.a      libswscale.a     pkgconfig

  you can see libavformat.a in the very first of the last line.

  so if I command like what you suggest, I get below.

  /root/ffmpeg/libavformat/vqf.c:244: undefined reference to `av_free_packet'
  
  /usr/local/lib//libavformat.a(vqf.o): In function `add_metadata':
  
  /root/ffmpeg/libavformat/vqf.c:58: undefined reference to `av_malloc'
  
  /root/ffmpeg/libavformat/vqf.c:64: undefined reference to `av_dict_set'
  
  /usr/local/lib//libavformat.a(vqf.o): In function `vqf_read_header':
  
  /root/ffmpeg/libavformat/vqf.c:148: undefined reference to `av_dict_set'
  
  /root/ffmpeg/libavformat/vqf.c:208: undefined reference to `av_log'
  
  /root/ffmpeg/libavformat/vqf.c:216: undefined reference to `av_malloc'
  
  /root/ffmpeg/libavformat/vqf.c:170: undefined reference to `av_log'
  
  /root/ffmpeg/libavformat/vqf.c:121: undefined reference to `av_log'
  
  /root/ffmpeg/libavformat/vqf.c:184: undefined reference to `av_log'
  
  /root/ffmpeg/libavformat/vqf.c:136: undefined reference to `av_log'
  
  /usr/local/lib//libavformat.a(wavenc.o): In function `wav_write_trailer':
  
  /root/ffmpeg/libavformat/wavenc.c:210: undefined reference to `av_rescale'
  
  /usr/local/lib//libavformat.a(wavenc.o): In function `wav_write_packet':
  
  /root/ffmpeg/libavformat/wavenc.c:181: undefined reference to `av_log'

  It is too long, so I just post little part of that.

  I think all link of libavformat has been broken, But I do not know

  what can I do to fix that link.

  I have installed that their official link said.

  https://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuideQuantal