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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 ?

  


• How to get time stamp of closest keyframe before a given timestamp with ffmpeg

  21 mai 2021, par loretoparisi

  To seek to position and get the closest frame I was using

  


  ffprobe -i /path/to.mp3 -show_frames -show_entries frame=pkt_pos -of default=noprint_wrappers=1:nokey=1 -hide_banner -loglevel panic -read_intervals $seconds%+#1


  


  where I specify the start position as :

  


  '-read_intervals', seconds + '%+#1', //Read only 1 packet after seeking to position 01:23


  


  With latest ffprobeversion

  


  $ ffprobe --version
ffprobe version 4.4 Copyright (c) 2007-2021 the FFmpeg developers


  


  it does not work anymore, and I get

  


  N/A


  


  hence the "first", while if I remove the $seconds%+#1 I get all

  


  ffprobe -i /path/to.mp3 -show_frames -show_entries frame=pkt_pos -of default=noprint_wrappers=1:nokey=1 -hide_banner -loglevel panic -read_intervals 20
N/A
1029888
1030306
1030724
1031142
1031560
1031978
1032396
1032814
1033232
1033650
1034068
1034486
1034904
...


  


  How to retrieve the closest frame then not using the read_intervals $seconds%+#1 but read_intervals $seconds only ?

  


• How to configure FFmpeg in windows ? [closed]

  2 août 2021, par GrassWarlock

  Hey there i'm not very tech savvy.

  


  when i invoke this command :

  


  ffmpeg -i input.mp4 -i subtitles.srt -map 0 -map 1 -c copy -c:v libx264 -crf 23 -preset veryfast output.mp4


  


  ( which is supposed to overlay 'input.mp4' with subtitles from 'subtitle.srt' )

  


  i get the following output :

  


  ffmpeg version 2021-07-27-git-0068b3d0f0-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.3.0 (Rev5, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      57.  2.100 / 57.  2.100
  libavcodec     59.  3.102 / 59.  3.102
  libavformat    59.  4.101 / 59.  4.101
  libavdevice    59.  0.100 / 59.  0.100
  libavfilter     8.  1.103 /  8.  1.103
  libswscale      6.  0.100 /  6.  0.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
Input #0, matroska,webm, from 'video.mkv':
  Metadata:
    ENCODER         : Lavf59.4.101
  Duration: 00:05:39.94, start: 0.000000, bitrate: 665 kb/s
  Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv), 720x480, SAR 1:1 DAR 3:2, 29.97 fps, 29.97 tbr, 1k tbn (default)
    Metadata:
      DURATION        : 00:05:39.839000000
  Stream #0:1: Audio: aac (LC), 44100 Hz, stereo, fltp (default)
    Metadata:
      HANDLER_NAME    : SoundHandler
      VENDOR_ID       : [0][0][0][0]
      DURATION        : 00:05:39.940000000
Input #1, srt, from 'subtitles.srt':
  Duration: N/A, bitrate: N/A
  Stream #1:0: Subtitle: subrip
[mp4 @ 000001aa596242c0] Could not find tag for codec subrip in stream #2, codec not currently supported in container
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:2 --
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
  Stream #1:0 -> #0:2 (copy)
    Last message repeated 1 times


  


  i searched the internet and the official documentation mentions that libass should be enabled in the configuration in order for subtitling to work

  


  


  11.218 subtitles

  


  Draw subtitles on top of input video using the libass library.

  


  To enable compilation of this filter you need to configure FFmpeg with
—enable-libass. This filter also requires a build with libavcodec and libavformat to convert the passed subtitles file to ASS (Advanced
Substation Alpha) subtitles format

  


  


  how do i enable libass in configuration on windows ? my FFmpeg directory doesn't contain a configuration file nor a command that configures it from cmd

  


  Thanks alot in advance