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• FFmpeg produces empty file sometimes

  30 avril 2024, par Matan Malka

  I am currently using ffmpeg and attempting to convert multiple PNG files to MP4 video.

  


  My command is :

  


  ffmpeg -y -r 10 -i "videos-reporter/MC4xMzg3NDI1MTY2Mjg1MTk=/b8a7ee17d8ecfd199edbc5edc9691698/screenshots/%04d.png" -vcodec libx264 -pix_fmt yuv420p -vf "scale=1200:trunc(ow/a/2)*2","setpts=3.0*PTS" "videos-reporter/MC4xMzg3NDI1MTY2Mjg1MTk=/b8a7ee17d8ecfd199edbc5edc9691698/video.mp4"


  


  Sometimes, I'm unsure when the ffmpeg creates a 1kb empty video file that cannot be played.

  


  [0-1] stderr: ffmpeg version N-47683-g0e8eb07980-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2018 the FFmpeg developers
[0-1]   built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
[0-1]   configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg
[0-1]   libavutil      56. 24.101 / 56. 24.101
[0-1]   libavcodec     58. 42.100 / 58. 42.100
[0-1]   libavformat    58. 24.100 / 58. 24.100
[0-1]   libavdevice    58.  6.101 / 58.  6.101
[0-1]   libavfilter     7. 46.101 /  7. 46.101
[0-1]   libswscale      5.  4.100 /  5.  4.100
[0-1]   libswresample   3.  4.100 /  3.  4.100
[0-1]   libpostproc    55.  4.100 / 55.  4.100
[0-1] Input #0, image2, from '/workspace/1/s/videos-reporter/MC4xMzg3NDI1MTY2Mjg1MTk=/b8a7ee17d8ecfd199edbc5edc9691698/screenshots/%04d.png':
[0-1]   Duration: 00:00:18.08, start: 0.000000, bitrate: N/A
[0-1]     Stream #0:0: Video: png, rgba(pc), 1920x1080, 25 fps, 25 tbr, 25 tbn, 25 tbc
[0-1] Stream mapping:
[0-1]   Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
[0-1] Press [q] to stop, [?] for help
[0-1] [libx264 @ 0x6cb2140] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
[0-1] [libx264 @ 0x6cb2140] profile High, level 3.1, 4:2:0, 8-bit
[0-1] [libx264 @ 0x6cb2140] 264 - core 157 r2935 545de2f - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=21 lookahead_threads=3 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=10 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
[0-1] Output #0, mp4, to 'videos-reporter/MC4xMzg3NDI1MTY2Mjg1MTk=/b8a7ee17d8ecfd199edbc5edc9691698/video.mp4':
[0-1]   Metadata:
[0-1]     encoder         : Lavf58.24.100
[0-1]     Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1200x674, q=-1--1, 10 fps, 10240 tbn, 10 tbc
[0-1]     Metadata:
[0-1]       encoder         : Lavc58.42.100 libx264
[0-1]     Side data:
[0-1]       cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
[0-1] frame=   10 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=6 drop=0 speed=   0x    
frame=   58 fps= 47 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=38 drop=0 speed=   0x    
frame=   82 fps= 46 q=25.0 size=       0kB time=00:00:01.40 bitrate=   0.3kbits/s dup=54 drop=0 speed=0.79x    
frame=  109 fps= 48 q=25.0 size=       0kB time=00:00:04.10 bitrate=   0.1kbits/s dup=72 drop=0 speed= 1.8x 


  


• ffmpeg generating out of sync audio/video file

  2 mars 2013, par marcelorocks

  I am trying to convert a flv video to mp4 using a264, but the result video has a out of sync audio/video. Audio seems ok but video seems slow and therefore out of sync. I am a newbie on video conversion so any help is appreciated.

  Here is the command I am running :

  /opt/local/bin/ffmpeg -i complaint.flv -f mp4 -vcodec libx264 -acodec aac -copyts -strict experimental -fpre /opt/local/share/ffmpeg/libx264-lossless_slow.ffpreset -ab 44k -threads 0 -crf 23 complaint.mp4

  And the printout :

  Desktop  /opt/local/bin/ffmpeg -i complaint.flv -f mp4 -vcodec libx264 -acodec aac -copyts -strict experimental -fpre /opt/local/share/ffmpeg/libx264-lossless_slow.ffpreset -ab 44k -threads 0 -crf 23 complaint.mp4
  
  ffmpeg version 0.7.8, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Jan 12 2012 21:12:26 with gcc 4.2.1 (Apple Inc. build 5666) (dot 3)
  
    configuration: --prefix=/opt/local --enable-gpl --enable-postproc --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libdirac --enable-libschroedinger --enable-libopenjpeg --enable-libxvid --enable-libx264 --enable-libvpx --enable-libspeex --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/gcc-4.2 --arch=x86_64 --enable-yasm
  
    libavutil    50. 43. 0 / 50. 43. 0
  
    libavcodec   52.123. 0 / 52.123. 0
  
    libavformat  52.111. 0 / 52.111. 0
  
    libavdevice  52.  5. 0 / 52.  5. 0
  
    libavfilter   1. 80. 0 /  1. 80. 0
  
    libswscale    0. 14. 1 /  0. 14. 1
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  [flv @ 0x7fe57a04ac00] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, flv, from 'complaint.flv':
  
    Metadata:
  
      duration        : 7
  
      creationdate    : Thu Jan 12 23:47:24
  
      description     : Recorded using VideoRecording example.
  
    Duration: 00:00:06.61, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: flv, yuv420p, 288x288, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0.1: Audio: nellymoser, 11025 Hz, mono, s16
  
  File 'complaint.mp4' already exists. Overwrite ? [y/N] y
  
  [buffer @ 0x7fe579c32cc0] w:288 h:288 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:
  
  [libx264 @ 0x7fe57a044600] using cpu capabilities: none!
  
  [libx264 @ 0x7fe57a044600] profile High, level 4.2
  
  [libx264 @ 0x7fe57a044600] 264 - core 118 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x33 me=umh subme=6 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=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=1.41 aq=1:1.00
  
  Output #0, mp4, to 'complaint.mp4':
  
    Metadata:
  
      duration        : 7
  
      creationdate    : Thu Jan 12 23:47:24
  
      description     : Recorded using VideoRecording example.
  
      encoder         : Lavf52.111.0
  
      Stream #0.0: Video: libx264, yuv420p, 288x288, q=0-69, 200 kb/s, 1k tbn, 1k tbc
  
      Stream #0.1: Audio: aac, 11025 Hz, mono, s16, 44 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1
  
  Press [q] to stop, [?] for help
  
  frame= 6557 fps=106 q=-1.0 Lsize=     685kB time=00:00:03.62 bitrate=1549.1kbits/s dup=6367 drop=0    
  
  video:615kB audio:17kB global headers:0kB muxing overhead 8.361360%
  
  frame I:27    Avg QP:19.98  size:  8242
  
  [libx264 @ 0x7fe57a044600] frame P:6530  Avg QP:30.71  size:    62
  
  [libx264 @ 0x7fe57a044600] mb I  I16..4: 11.1% 79.3%  9.6%
  
  [libx264 @ 0x7fe57a044600] mb P  I16..4:  0.1%  0.2%  0.0%  P16..4:  1.2%  0.2%  0.3%  0.0%  0.0%    skip:98.0%
  
  [libx264 @ 0x7fe57a044600] 8x8 transform intra:77.8% inter:64.9%
  
  [libx264 @ 0x7fe57a044600] coded y,uvDC,uvAC intra: 75.3% 81.3% 33.3% inter: 0.5% 0.7% 0.1%
  
  [libx264 @ 0x7fe57a044600] i16 v,h,dc,p: 78%  9% 10%  3%
  
  [libx264 @ 0x7fe57a044600] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 35% 11% 32%  3%  4%  5%  2%  5%  4%
  
  [libx264 @ 0x7fe57a044600] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 56%  7%  9%  3%  4%  7%  3%  7%  3%
  
  [libx264 @ 0x7fe57a044600] i8c dc,h,v,p: 45% 15% 34%  6%
  
  [libx264 @ 0x7fe57a044600] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x7fe57a044600] ref P L0: 80.5%  9.5% 10.0%
  
  [libx264 @ 0x7fe57a044600] kb/s:767.20

• FFMPEG image + music = video

  24 septembre 2017, par Nikita Slastikhin

  Just trying todo video for youtube from image (1080p .png) + music (320Kb mp3).

      ffmpeg -loop 1 -i image.png -i music.mp3 -c:a copy -c:v libx264 -crf 0 -preset veryslow -shortest output.mp4
  

  But converting is to slowly.
  Any ideas, how it make optimize ?

  E:_TEST>ffmpeg -loop 1 -i image0.png -i music0.mp3 -c:a aac -c:v libx264 -crf 0 -preset veryfast -shortest video0.mp4
   ffmpeg version N-87306-g6743351 Copyright (c) 2000-2017 the FFmpeg developers
   built with gcc 7.2.0 (GCC)
   configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib
   libavutil            55. 75.100 / 55. 75.100
   libavcodec         57.106.101 / 57.106.101
   libavformat        57. 82.100 / 57. 82.100
   libavdevice        57.    8.101 / 57.    8.101
   libavfilter         6.105.100 /    6.105.100
   libswscale            4.    7.103 /    4.    7.103
   libswresample     2.    8.100 /    2.    8.100
   libpostproc        54.    6.100 / 54.    6.100
   Input #0, png_pipe, from 'image0.png':
   Duration: N/A, bitrate: N/A
       Stream #0:0: Video: png, rgb24(pc), 1920x1080, 25 fps, 25 tbr, 25 tbn, 25 tbc
   Input #1, mp3, from 'music0.mp3':
   Metadata:
       encoder                 : Lavf57.56.101
   Duration: 01:00:33.06, start: 0.025057, bitrate: 128 kb/s
       Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
       Metadata:
           encoder                 : Lavc57.64
   Stream mapping:
   Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
   Stream #1:0 -> #0:1 (mp3 (native) -> aac (native))
   Press [q] to stop, [?] for help
   [libx264 @ 0000000002d3f320] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX XOP FMA3 BMI1
   [libx264 @ 0000000002d3f320] profile High 4:4:4 Predictive, level 4.0, 4:4:4 8-bit
   [libx264 @ 0000000002d3f320] 264 - core 152 r2851 ba24899 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - <a href="http://www.videolan.org/x264.html" rel="nofollow noreferrer">http://www.videolan.org/x264.html</a> - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=2 psy=0 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=12 lookahead_threads=4 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc=cqp mbtree=0 qp=0
   Output #0, mp4, to 'video0.mp4':
   Metadata:
       encoder                 : Lavf57.82.100
       Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv444p(progressive), 1920x1080, q=-1--1, 25 fps, 12800 tbn, 25 tbc
       Metadata:
           encoder                 : Lavc57.106.101 libx264
       Side data:
           cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
       Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
       Metadata:
           encoder                 : Lavc57.106.101 aac
   frame=    107 fps= 40 q=-1.0 Lsize=         778kB time=00:00:04.24 bitrate=1503.5kbits/s speed=1.57x