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• ffmpeg hangs when running -i in alpine docker container cron job

  14 mai 2021, par Richard Westby-Nunn

  I'm see strange behaviour in ffmpeg not running the -i option ONLY when running as a cron job. I can run the command fine directly via the shell. The the cronjob command runs, and it even "starts" the ffmpeg "executable", but it then hangs when it gets to the -i option and arguments.

  


  I have included a copy of a working output when run from the shell prompt to demonstrate what the output should show.

  


  alpine : 3.13.5

  


  docker image : alpine:latest (date : 2021-05-14)

  


  docker run :

  


  docker run -v s:\_docker\_alpine-test:/media/pi --name alpine -it alpine crond -f -l8

  


  crontab script :

  


  /media/pi/_site/pics-alpine.sh 2>&1 | tee /media/pi/_site/alpine.log

  


  /media/pi/_site/pics-alpine.sh script :

  


  #!/bin/ash

set -xv

echo "START"

#encode jpgs to mp4
/usr/bin/ffmpeg -i /media/pi/to-video-back/%04d.jpg  /media/pi/_site/back/back-latest.mp4

echo "END"


  


  The output of the log file is :

  


  echo "START"
+ echo START
START

### encode jpgs to mp4
/usr/bin/ffmpeg -i /media/pi/to-video-back/%04d.jpg  /media/pi/_site/back/back-latest.mp4
+ /usr/bin/ffmpeg -i '/media/pi/to-video-back/%04d.jpg' /media/pi/_site/back/back-latest.mp4
ffmpeg version 4.4 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.1 (Alpine 10.2.1_git20210328) 20210328
  configuration: --prefix=/usr --enable-avresample --enable-avfilter --enable-gnutls --enable-gpl --enable-libass --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libx264 --enable-libx265 --enable-libtheora --enable-libv4l2 --enable-libdav1d --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-libxcb --enable-libsrt --enable-libssh --enable-libvidstab --disable-stripping --disable-static --disable-librtmp --enable-vaapi --enable-vdpau --enable-libopus --enable-vulkan --enable-libsoxr --enable-libwebp --enable-libaom --disable-debug


  


  Script output when run directly from the shell prompt :

  


  /media/pi/_site # ./pics-alpine.sh

echo "START"
+ echo START
START

### encode jpgs to mp4
/usr/bin/ffmpeg -i /media/pi/to-video-back/%04d.jpg  /media/pi/_site/back/back-latest.mp4
+ /usr/bin/ffmpeg -i '/media/pi/to-video-back/%04d.jpg' /media/pi/_site/back/back-latest.mp4
ffmpeg version 4.4 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.1 (Alpine 10.2.1_git20210328) 20210328
  configuration: --prefix=/usr --enable-avresample --enable-avfilter --enable-gnutls --enable-gpl --enable-libass --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libx264 --enable-libx265 --enable-libtheora --enable-libv4l2 --enable-libdav1d --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-libxcb --enable-libsrt --enable-libssh --enable-libvidstab --disable-stripping --disable-static --disable-librtmp --enable-vaapi --enable-vdpau --enable-libopus --enable-vulkan --enable-libsoxr --enable-libwebp --enable-libaom --disable-debug
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, image2, from '/media/pi/to-video-back/%04d.jpg':
  Duration: 00:00:00.96, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 1280x960, 25 fps, 25 tbr, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x7fd9cf099b00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7fd9cf099b00] profile High, level 3.2, 4:2:0, 8-bit
[libx264 @ 0x7fd9cf099b00] 264 - core 161 - 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=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=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 '/media/pi/_site/back/back-latest.mp4':
  Metadata:
    encoder         : Lavf58.76.100
  Stream #0:0: Video: h264 (avc1 / 0x31637661), yuvj420p(pc, bt470bg/unknown/unknown, progressive), 1280x960, q=2-31, 25 fps, 12800 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=   24 fps=0.0 q=-1.0 Lsize=      25kB time=00:00:00.84 bitrate= 242.1kbits/s speed=1.56x
video:24kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 4.565835%
[libx264 @ 0x7fd9cf099b00] frame I:2     Avg QP:17.30  size:  3693
[libx264 @ 0x7fd9cf099b00] frame P:11    Avg QP:20.46  size:   854
[libx264 @ 0x7fd9cf099b00] frame B:11    Avg QP:22.05  size:   623
[libx264 @ 0x7fd9cf099b00] consecutive B-frames: 29.2% 25.0% 12.5% 33.3%
[libx264 @ 0x7fd9cf099b00] mb I  I16..4: 14.6% 83.5%  2.0%
[libx264 @ 0x7fd9cf099b00] mb P  I16..4:  3.0%  2.2%  0.0%  P16..4:  5.2%  0.1%  0.1%  0.0%  0.0%    skip:89.3%
[libx264 @ 0x7fd9cf099b00] mb B  I16..4:  0.4%  0.1%  0.0%  B16..8:  6.5%  0.0%  0.0%  direct: 0.1%  skip:92.9%  L0:35.0% L1:64.8% BI: 0.2%
[libx264 @ 0x7fd9cf099b00] 8x8 transform intra:73.3% inter:94.3%
[libx264 @ 0x7fd9cf099b00] coded y,uvDC,uvAC intra: 8.5% 12.1% 0.5% inter: 0.7% 3.3% 0.0%
[libx264 @ 0x7fd9cf099b00] i16 v,h,dc,p: 77% 15%  6%  2%
[libx264 @ 0x7fd9cf099b00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 71%  6% 20%  1%  1%  0%  1%  0%  0%
[libx264 @ 0x7fd9cf099b00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 55% 13% 24%  1%  3%  1%  1%  1%  1%
[libx264 @ 0x7fd9cf099b00] i8c dc,h,v,p: 92%  4%  4%  0%
[libx264 @ 0x7fd9cf099b00] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7fd9cf099b00] ref P L0: 57.6%  2.5% 30.8%  9.1%
[libx264 @ 0x7fd9cf099b00] ref B L0: 70.2% 27.6%  2.2%
[libx264 @ 0x7fd9cf099b00] ref B L1: 98.5%  1.5%
[libx264 @ 0x7fd9cf099b00] kb/s:196.96

echo "END"
+ echo END
END


  


  As you can see from the above, when run from the shell prompt it starts ffmpeg and then processes the arguments. But when running as cron, it opens ffmpeg, but ignores, or hangs on the processing of the arguments.

  


  Lastly, I have the following show up in ps ax when I do a check to see what is running :

  


     58 root      0:00 /bin/ash -c /media/pi/_site/pics-alpine.sh 2>&1 | tee /media/pi/_site/alpine.log
   59 root      0:00 {pics-alpine.sh} /bin/ash /media/pi/_site/pics-alpine.sh
   60 root      0:00 tee /media/pi/_site/alpine.log
   61 root      0:00 /usr/bin/ffmpeg -i /media/pi/to-video-back/%04d.jpg /media/pi/_site/back/back-latest.mp4


  


  Those are just sitting there as though they are waiting on input, so I suspect the ffmpeg has a bug, or my cron is not passing the arguments correctly.

  


  Any thoughts on how to fix this ?

  


• I want to change the file name with exiftool. To “Result of adding time zone (+9) to CreateDate”

  7 décembre 2019, par user3474300

  I shot a video with a sony camera.
  A file with the extension .mp4 was created.
  I want to change the shooting date and time to a file name.
  The environment is Windows10.

  ---

  What I tried

  I first dragged and dropped the .mp4 video file to exiftool (-k) .exe.

  ExifTool Version Number         : 11.76
  
  File Name                       : C0001.MP4
  
  File Modification Date/Time     : 2019:10:23 13:10:49+09:00
  
  File Access Date/Time           : 2019:11:17 21:50:24+09:00
  
  File Creation Date/Time         : 2019:11:17 21:50:21+09:00
  
  MIME Type                       : video/mp4
  
  Major Brand                     : Sony XAVC
  
  Create Date                     : 2019:10:23 04:10:32
  
  Modify Date                     : 2019:10:23 04:10:32
  
  Track Create Date               : 2019:10:23 04:10:32
  
  Track Modify Date               : 2019:10:23 04:10:32
  
  Media Create Date               : 2019:10:23 04:10:32
  
  Media Modify Date               : 2019:10:23 04:10:32
  
  Time Zone                       : +09:00
  
  Last Update                     : 2019:10:23 13:10:32+09:00
  
  Creation Date Value             : 2019:10:23 13:10:32+09:00

  I then typed the following command at a Windows 10 command prompt :

  C:\hoge>"exiftool(-k).exe" -r "-FileNamehoge/C0001.MP4
  
  Warning: Error removing old file - C:/hoge/C0001.MP4
  
      1 directories scanned
  
      1 image files updated
  
  -- press RETURN --

  The following file was created.

  2019-10-23_04-10-32 - C0001.MP4

  ---

  How can I output the following file ?

  I don’t know how to add time zone (+9) to CreateDate.

  2019_1023_131032.MP4

• linking against SDL library on ubuntu

  18 novembre 2013, par ali129

  this is my first post
  I have this problem with SDL library and "ffmpeg's ffplay" and "dosbox" on ubuntu. Here is what happenning :
  I have installed SDL and code::blocks.
  I also wrote a simple sdl program that shows a picture and tried to compile it tree ways :

  1- On command prompt which compiled and works perfectly. ( i mean : gcc -o hellosdl hellosd.c -lsdlmain -lsdl)

  2- On code::blocks by choosing file->new->project->SDL project
  which compiled but gives an error regarding i can't initialize graphic

  and finally
  3- On code::blocks but this time i manually configured sdl. i mean i simply choosed a blanked c file.then added sdl linker options "-lsdlmain and -lsdl" in code::blocks linker settings. and this time the program workes perfectly.

  Now the problem i have with dosbox and ffmpeg. I tried to compile these programs by running ./configure and make and they compiled without any error. but when i try to run dosbox or ffplay they give me these errors :

  ffplay error :
  ffplay version 0.11.1.git Copyright (c) 2003-2012 the FFmpeg developers
  built on Oct 15 2013 04:34:36 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  configuration :
  libavutil 51. 73.101 / 51. 73.101
  libavcodec 54. 56.100 / 54. 56.100
  libavformat 54. 27.101 / 54. 27.101
  libavdevice 54. 2.100 / 54. 2.100
  libavfilter 3. 16.104 / 3. 16.104
  libswscale 2. 1.101 / 2. 1.101
  libswresample 0. 15.100 / 0. 15.100
  Could not initialize SDL - No available video device
  (Did you set the DISPLAY variable ?)

  and yes my DISPLAY variable is set correctly

  echo $DISPLAY
  :0.0

  and

  dosbox error :

  ---

  Exit to error : Can't init SDL No available video device

  i also tried installing dosbox using sudo apt-get install dosbox and it works perfectly.

  i don't know why for some occasion my sdl library works and for some doesn't .
  it would be great if you could help me.