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  • Why this shell command doesn't work ? ('command' works but 'command|cat' doesn't work)

    16 octobre 2018, par yabee

    Problem

    The following code outputs like...

    $ ffprobe -show_frames -select_streams v test.mp4 2>/dev/null|grep -A 2 key_frame=1
    
key_frame=1
    
pkt_pts=0
    
pkt_pts_time=0:00:00.000000
    
--
    
key_frame=1
    
pkt_pts=41041
    
pkt_pts_time=0:00:01.710042
    
--
    
key_frame=1
    
pkt_pts=64064
    
pkt_pts_time=0:00:02.669333
    
--
    
key_frame=1
    
pkt_pts=87087
    
pkt_pts_time=0:00:03.628625
    
--
    
...

    But the folowing one outputs nothing.

    $ ffprobe -show_frames -select_streams v test.mp4 2>/dev/null|grep -A 2 key_frame=1|cat

    And...

    $ ffprobe -show_frames -select_streams v test.mp4 2>/dev/null|grep key_frame=1
    
key_frame=1
    
key_frame=1
    
key_frame=1
    
key_frame=1
    
$ ffprobe -show_frames -select_streams v test.mp4 2>/dev/null|grep key_frame=1|cat
    
# Nothing outputted.

    Why ?

    Expected result

    What actually I want to do is

    $ ffprobe -show_frames -select_streams v test.mp4 2>/dev/null|grep -A 2key_frame=1|grep time
    
pkt_pts_time=0:00:00.000000
    
pkt_pts_time=0:00:01.710042
    
pkt_pts_time=0:00:02.669333
    
pkt_pts_time=0:00:03.628625
    
...

    But its result is

    $ ffprobe -show_frames -select_streams v test.mp4 2>/dev/null|grep -A 2key_frame=1|grep time
    
# Nothing outputted.

    Grep works correctory exept it’s after ffprobe.

    $ seq 30|grep 1|grep 2
    
12
    
21

    Environment

    • Bash on Ubuntu on Windows 10 Pro
      • Windows version : 1803
      • Windows OS build : 17134.345

    Environment of Ubuntu :

    $ cat /etc/lsb-release
    
DISTRIB_ID=Ubuntu
    
DISTRIB_RELEASE=18.04
    
DISTRIB_CODENAME=bionic
    
DISTRIB_DESCRIPTION="Ubuntu 18.04.1 LTS"
    

    
$ bash --version
    
GNU bash, version 4.4.19(1)-release (x86_64-pc-linux-gnu)
    
Copyright (C) 2016 Free Software Foundation, Inc.
    
License GPLv3+: GNU GPL version 3 or later /gnu.org/licenses/gpl.html>
    

    
This is free software; you are free to change and redistribute it.
    
There is NO WARRANTY, to the extent permitted by law.
    

    
$ ffprobe
    
ffprobe version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2007-2018 the FFmpeg developers
    
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
    
  configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
    
  libavutil      55. 78.100 / 55. 78.100
    
  libavcodec     57.107.100 / 57.107.100
    
  libavformat    57. 83.100 / 57. 83.100
    
  libavdevice    57. 10.100 / 57. 10.100
    
  libavfilter     6.107.100 /  6.107.100
    
  libavresample   3.  7.  0 /  3.  7.  0
    
  libswscale      4.  8.100 /  4.  8.100
    
  libswresample   2.  9.100 /  2.  9.100
    
  libpostproc    54.  7.100 / 54.  7.100
    
Simple multimedia streams analyzer
    
usage: ffprobe [OPTIONS] [INPUT_FILE]
    

    
You have to specify one input file.
    
Use -h to get full help or, even better, run 'man ffprobe'.

    What is problem ?

    Does grep or ffprobe change its behavior by existence of pipe in this case ?
    Thanks.

  • ffmpeg concatenation with -filter_complex

    16 octobre 2018, par Igniter

    I’ve seen several similar questions but none of them actually helped in my case.
    Getting this error while trying to join 1 audio and 4 video files of different nature and resolutions.

    ffmpeg -i 0.mp3 -i 1.mp4 -i 2.mkv -i 3.mkv -i 4.webm \
    
    -filter_complex [0:a:0][1:v:0][2:v:0][3:v:0][4:v:0]concat=n=5:v=1:a=1[outv][outa] \
    
    -map "[outv]" -map "[outa]" output.mp4

    All this gives the following error :

    Stream specifier ':a:0' in filtergraph description [0:a:0][1:v:0][2:v:0][3:v:0][4:v:0]concat=n=5:v=1:a=1[outv][outa] matches no streams.

    Straight concatenation -i "concat:0.mp3|1.mp4..." also doesn’t work as expected due to different resolutions and video formats. All methods syntax was taken from official documentation but there should be something that I’ve missed here.

    Full output log :

    ffmpeg version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2000-2018 the FFmpeg developers
    
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
    
  configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
    
  libavutil      55. 78.100 / 55. 78.100
    
  libavcodec     57.107.100 / 57.107.100
    
  libavformat    57. 83.100 / 57. 83.100
    
  libavdevice    57. 10.100 / 57. 10.100
    
  libavfilter     6.107.100 /  6.107.100
    
  libavresample   3.  7.  0 /  3.  7.  0
    
  libswscale      4.  8.100 /  4.  8.100
    
  libswresample   2.  9.100 /  2.  9.100
    
  libpostproc    54.  7.100 / 54.  7.100
    
Input #0, mp3, from 'mp3/10.mp3':
    
  Metadata:
    
    album_artist    : artist
    
    title           : title
    
    artist          : 10
    
    album           : 12
    
    track           : 1
    
    VideoKind       : 2
    
    date            : 2009
    
  Duration: 00:06:00.44, start: 0.025056, bitrate: 64 kb/s
    
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 64 kb/s
    
    Metadata:
    
      encoder         : LAME3.98r
    
    Stream #0:1: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 200x200 [SAR 72:72 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
    
    Metadata:
    
      comment         : Cover (front)
    
Input #1, matroska,webm, from '1.mp4':
    
  Metadata:
    
    MINOR_VERSION   : 0
    
    COMPATIBLE_BRANDS: iso6avc1mp41
    
    MAJOR_BRAND     : dash
    
    ENCODER         : Lavf57.83.100
    
  Duration: 00:01:53.05, start: 0.007000, bitrate: 2292 kb/s
    
    Stream #1:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 1k tbn, 48 tbc (default)
    
    Metadata:
    
      HANDLER_NAME    : VideoHandler
    
      DURATION        : 00:01:53.048000000
    
Input #2, matroska,webm, from '2.mkv':
    
  Metadata:
    
    MINOR_VERSION   : 0
    
    COMPATIBLE_BRANDS: iso6avc1mp41
    
    MAJOR_BRAND     : dash
    
    ENCODER         : Lavf57.83.100
    
  Duration: 00:02:08.09, start: 0.007000, bitrate: 1607 kb/s
    
    Stream #2:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 1k tbn, 48 tbc (default)
    
    Metadata:
    
      HANDLER_NAME    : VideoHandler
    
      DURATION        : 00:02:08.090000000
    
Input #3, matroska,webm, from '3.mkv':
    
  Metadata:
    
    MINOR_VERSION   : 0
    
    COMPATIBLE_BRANDS: iso6avc1mp41
    
    MAJOR_BRAND     : dash
    
    ENCODER         : Lavf57.83.100
    
  Duration: 00:01:37.05, start: 0.007000, bitrate: 3525 kb/s
    
    Stream #3:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 1k tbn, 48 tbc (default)
    
    Metadata:
    
      HANDLER_NAME    : VideoHandler
    
      DURATION        : 00:01:37.048000000
    
Input #4, matroska,webm, from '4.webm':
    
  Metadata:
    
    MINOR_VERSION   : 0
    
    COMPATIBLE_BRANDS: iso6avc1mp41
    
    MAJOR_BRAND     : dash
    
    ENCODER         : Lavf57.83.100
    
  Duration: 00:01:45.13, start: 0.007000, bitrate: 3685 kb/s
    
    Stream #4:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 1k tbn, 48 tbc (default)
    
    Metadata:
    
      HANDLER_NAME    : VideoHandler
    
      DURATION        : 00:01:45.131000000
    
Stream specifier ':a:0' in filtergraph description [0:a:0][1:v:0][2:v:0][3:v:0][4:v:0]concat=n=5:v=1:a=1[outv][outa] matches no streams.

  • Invalid data when converting mp4 to x264 with ffmpeg but fine when converting flv to x264

    15 octobre 2018, par Julien

    I have a PHP script that converts uploaded videos to x264, it works fine if I upload an FLV, but with an MP4 it doesn’t work, here’s the command and output :

    Command :

    ffmpeg -y -i ../../flv/rjaRGKzSMtksUJ4kGbsLMYEcr.mp4 -crf 0 -vcodec libx264 -movflags faststart ../../flv/rjaRGKzSMtksUJ4kGbsLMYEcr.mp4 2>&1

    Output :

    ffmpeg version N-67321-ge5054c8 Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Nov  1 2014 12:53:28 with gcc 4.8.2 (GCC) 20140120 (Red Hat 4.8.2-16)
    
  configuration: --extra-libs=-ldl --enable-gpl --enable-nonfree --enable-libfdk_aac --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libx264
    
  libavutil      54. 11.100 / 54. 11.100
    
  libavcodec     56. 10.100 / 56. 10.100
    
  libavformat    56. 11.101 / 56. 11.101
    
  libavdevice    56.  2.100 / 56.  2.100
    
  libavfilter     5.  2.100 /  5.  2.100
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../../flv/rjaRGKzSMtksUJ4kGbsLMYEcr.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2mp41
    
    creation_time   : 2018-10-08 12:03:53
    
    encoder         : Lavf56.15.102
    
  Duration: 00:03:03.08, start: 0.023129, bitrate: 1647 kb/s
    
    Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 720x404 [SAR 1:1 DAR 180:101], 1547 kb/s, 24 fps, 24 tbr, 12288 tbn, 24 tbc (default)
    
    Metadata:
    
      creation_time   : 2018-10-08 12:03:53
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 95 kb/s (default)
    
    Metadata:
    
      creation_time   : 2018-10-08 12:03:53
    
      handler_name    : SoundHandler
    
[libx264 @ 0x1f0a080] using SAR=1/1
    
[libx264 @ 0x1f0a080] using cpu capabilities: MMX2 SSE Cache64
    
[libx264 @ 0x1f0a080] profile High 4:4:4 Predictive, level 3.0, 4:2:0 8-bit
    
[libx264 @ 0x1f0a080] 64 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=0 mixed_ref=1 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=2 keyint=250 keyint_min=24 scenecut=40 intra_refresh=0 rc=cqp mbtree=0 qp=0
    
Output #0, mp4, to '../../flv/rjaRGKzSMtksUJ4kGbsLMYEcr.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2mp41
    
    encoder         : Lavf56.11.101
    
    Stream #0:0(und): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 720x404 [SAR 1:1 DAR 180:101], q=-1--1, 24 fps, 12288 tbn, 24 tbc (default)
    
    Metadata:
    
      creation_time   : 2018-10-08 12:03:53
    
      handler_name    : VideoHandler
    
      encoder         : Lavc56.10.100 libx264
    
    Stream #0:1(und): Audio: aac (libfdk_aac) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, s16, 128 kb/s (default)
    
    Metadata:
    
      creation_time   : 2018-10-08 12:03:53
    
      handler_name    : SoundHandler
    
      encoder         : Lavc56.10.100 libfdk_aac
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (libx264))
    
  Stream #0:1 -> #0:1 (aac (native) -> aac (libfdk_aac))
    
Press [q] to stop, [?] for help
    
[mpeg4 @ 0x2004420] ac-tex damaged at 1 1
    
[mpeg4 @ 0x2004420] Error at MB: 47
    
[mpeg4 @ 0x2004420] concealing 1170 DC, 1170 AC, 1170 MV errors in P frame
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x1ed3ec0] stream 1, offset 0xee5b: partial file
    
../../flv/rjaRGKzSMtksUJ4kGbsLMYEcr.mp4: Invalid data found when processing input
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x1ed3ec0] stream 0, offset 0xef98: partial file
    
../../flv/rjaRGKzSMtksUJ4kGbsLMYEcr.mp4: Invalid data found when processing input
    
[mp4 @ 0x1f08f40] Starting second pass: moving the moov atom to the beginning of the file
    
frame=    3 fps=0.0 q=-1.0 Lsize=     116kB time=00:00:00.12 bitrate=7585.3kbits/s dup=1 drop=0    
    
video:113kB audio:2kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.171168%
    
[libx264 @ 0x1f0a080] frame I:1     Avg QP: 0.00  size:113785
    
[libx264 @ 0x1f0a080] frame P:2     Avg QP: 0.00  size:   518
    
[libx264 @ 0x1f0a080] mb I  I16..4: 38.4%  0.0% 61.6%
    
[libx264 @ 0x1f0a080] mb P  I16..4:  0.2%  0.0%  0.1%  P16..4:  1.2%  0.1%  0.2%  0.0%  0.0%    skip:98.3%
    
[libx264 @ 0x1f0a080] 8x8 transform intra:0.0% inter:3.1%
    
[libx264 @ 0x1f0a080] coded y,uvDC,uvAC intra: 91.6% 88.7% 88.7% inter: 0.7% 0.2% 0.2%
    
[libx264 @ 0x1f0a080] i16 v,h,dc,p: 46% 53%  1%  0%
    
[libx264 @ 0x1f0a080] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 44% 40%  3%  2%  3%  2%  2%  2%  2%
    
[libx264 @ 0x1f0a080] i8c dc,h,v,p:  2% 55% 43%  0%
    
[libx264 @ 0x1f0a080] Weighted P-Frames: Y:0.0% UV:0.0%
    
[libx264 @ 0x1f0a080] kb/s:7348.61

    As you can see there are some errors, there. I’ve tried with several different mp4 files, from different sources so it’s not a problem of the video files.

    I’ve also tried without the -movflags faststart option, also tried with -q:v 0 instead of -crf 0, nothing works, but like stated above, it works from FLV -> MP4, what am i doing wrong here ?

    PS : By "Nothing works" I mean the resulting MP4 plays for 1 frame in the browser and stops.

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