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• Use FFMPEG to convert MP4/AAC to MP3 without audio time getting shortened

  10 janvier 2023, par Esenkay07

  I've been struggling with extracting the audio from a couple of mp4 files I have. I have tried using all of the different answers posted previously on Stack Overflow, but each of them results in an mp3 file that's shorter than the original mp4.

  


  If anyone has any insights as to what I'm doing wrong, that'd be greatly appreciated, or at the very least why it's not this simple to convert from mp4 to mp3.

  


  I have tried copying the codec and using variable bitrate. The input video is 1:24:56, but the output audio is 1:24:46.

  


  Command : ffmpeg -i sample.mp4 -c:v copy -q:a 0 sample.mp3

  


  Output :

  


  $ffmpeg -i sample.mp4 -c:v copy -q:a 0 sample.mp3

ffmpeg version 2023-01-09-git-13d04e30d7-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12.1.0 (Rev2, 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-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --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. 43.100 / 57. 43.100
  libavcodec     59. 56.100 / 59. 56.100
  libavformat    59. 34.102 / 59. 34.102
  libavdevice    59.  8.101 / 59.  8.101
  libavfilter     8. 53.100 /  8. 53.100
  libswscale      6.  8.112 /  6.  8.112
  libswresample   4.  9.100 /  4.  9.100
  libpostproc    56.  7.100 / 56.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'sample.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.83.100
  Duration: 01:24:56.57, start: 0.000000, bitrate: 612 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 480 kb/s, 29.94 fps, 30 tbr, 90k tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:1 -> #0:0 (aac (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, mp3, to 'sample.mp3':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    TSSE            : Lavf59.34.102
  Stream #0:0(und): Audio: mp3, 44100 Hz, stereo, fltp (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.56.100 libmp3lame
size=   88336kB time=01:24:56.54 bitrate= 142.0kbits/s speed= 172x
video:0kB audio:88336kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000394%


  


• How to put the output of ffmpeg into a pipe in Python ? [duplicate]

  16 février 2023, par Eric Palmer

  I'm trying to use python to feed the results of ffmpeg into a pipeline, and then I can use this pipeline for subsequent operations (such as rtmp streaming). I've written the correct command, but I don't know how to accomplish this with Python.

  


  I wrote the following code in the Shell, it can run correctly.

  


  ffmpeg -re -i '2023-02-16_21:02:50.mp4' -f mpegts -c:v copy -c:a aac -vbsf h264_mp4toannexb pipe:1.ts | cat >> push


  


  When I'm trying to do the above in Python, I'm getting an error.

  


  cat: '>>': No such file or directory


  


  Here is my python code.

  


  command = [
    'docker',
    'run',
    '-v',
    f'{cwd}:{cwd}',
    '-w',
    f'{cwd}',
    'jrottenberg/ffmpeg',
    '-re',
    '-i', f'{video_path}',
    '-f', 'mpegts',
    '-c:v', 'copy',
    '-c:a', 'aac',
    '-vbsf', 'h264_mp4toannexb',
    'pipe:1.ts',
]

pa = subprocess.Popen(
    command,
    stdout = subprocess.PIPE,
    stderr = error_file
)

command = [
    'cat',
    '>>',
    f'{pipe_name}'
]

with pa.stdout:
    pb = subprocess.Popen(
        command,
        stdin = pa.stdout,
        stdout = error_file,
        stderr = error_file
    )


  


• 12 ffmpeg xfade transitions : "option not found"

  17 juillet 2023, par nimda

  I'm running into a strange error where each of these following 12 of the 56 xfade transitions are throwing errors :

  


  

  • hlwind

  


  • hrwind

  


  • vuwind

  


  • vdwind

  


  • coverleft

  


  • coverright

  


  • coverup

  


  • coverdown

  


  • revealleft

  


  • revealright

  


  • revealup

  


  • revealdown

  


  


  I've tested all filter transitions with the following command, which is being generated by a nodeJS app with the fluent-ffmpeg library, and only the twelve listed above fail with the same error "option not found" :

  


  ffmpeg -f lavfi -t 169
  -i color=c=000000:s=960x540:r=30:duration=169
  -i file:///Users/johnbandy/Work/Projects/Active/CNCT/XFade/_assets/crosstrekvx-1.jpg
  -i file:///Users/johnbandy/Work/Projects/Active/CNCT/XFade/_assets/crosstrekvx-2.jpg 
  -filter_complex
    [1:v]format=pix_fmts=yuva420p,scale=w=4608:h=-1,zoompan=z='1.2+(0*(ot/4))':x='(on/(30*4))*(iw-iw/1.2)':y='(ih-ih/zoom)/2':d=120:s=960x540[1_up];
    [1_up]scale=w=960:h=-1[1_down];
    [2:v]format=pix_fmts=yuva420p,scale=w=4608:h=-1,zoompan=z='1.2+(0*(ot/4))':x='(on/(30*4))*(iw-iw/1.2)':y='(ih-ih/zoom)/2':d=120:s=960x540[2_up];
    [2_up]scale=w=960:h=-1[2_down];
    [1_down][2_down]xfade=transition=revealdown:duration=1:offset=3[2_out];
    [0:v][2_out]overlay=x=0:y=0:enable='lte(t,7)'[all_out]
  -vcodec libx264 -r 30 -f mp4 -map [all_out] -preset veryfast -crf 18 -movflags frag_keyframe+empty_moov -pix_fmt yuv420p all.mp4


  


  fflog output :

  


  ffmpeg version 6.0 Copyright (c) 2000-2023 the FFmpeg developers
  built with Apple clang version 14.0.3 (clang-1403.0.22.14.1)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.0 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
  libavutil      58.  2.100 / 58.  2.100
  libavcodec     60.  3.100 / 60.  3.100
  libavformat    60.  3.100 / 60.  3.100
  libavdevice    60.  1.100 / 60.  1.100
  libavfilter     9.  3.100 /  9.  3.100
  libswscale      7.  1.100 /  7.  1.100
  libswresample   4. 10.100 /  4. 10.100
  libpostproc    57.  1.100 / 57.  1.100
Input #0, lavfi, from 'color=c=000000:s=960x540:r=30:duration=169':
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: wrapped_avframe, yuv420p, 960x540 [SAR 1:1 DAR 16:9], 30 fps, 30 tbr, 30 tbn
Input #1, image2, from 'file:///Users/johnbandy/Work/Projects/Active/CNCT/XFade/_assets/crosstrekvx-1.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 36486 kb/s
  Stream #1:0: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 960x540, 25 fps, 25 tbr, 25 tbn
Input #2, image2, from 'file:///Users/johnbandy/Work/Projects/Active/CNCT/XFade/_assets/crosstrekvx-2.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 35680 kb/s
  Stream #2:0: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 960x540, 25 fps, 25 tbr, 25 tbn
[Parsed_xfade_8 @ 0x60000137cb00] [Eval @ 0x16f9b5348] Undefined constant or missing '(' in 'revealdown'
[Parsed_xfade_8 @ 0x60000137cb00] Unable to parse option value "revealdown"
Error applying option 'transition' to filter 'xfade': Option not found
Error initializing complex filters.
Option not found


  


  The fflog for a successful video generation follows (for comparison to the erroneous log above) :

  


  ffmpeg version 6.0 Copyright (c) 2000-2023 the FFmpeg developers
  built with Apple clang version 14.0.3 (clang-1403.0.22.14.1)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.0 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
  libavutil      58.  2.100 / 58.  2.100
  libavcodec     60.  3.100 / 60.  3.100
  libavformat    60.  3.100 / 60.  3.100
  libavdevice    60.  1.100 / 60.  1.100
  libavfilter     9.  3.100 /  9.  3.100
  libswscale      7.  1.100 /  7.  1.100
  libswresample   4. 10.100 /  4. 10.100
  libpostproc    57.  1.100 / 57.  1.100
Input #0, lavfi, from 'color=c=000000:s=960x540:r=30:duration=169':
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: wrapped_avframe, yuv420p, 960x540 [SAR 1:1 DAR 16:9], 30 fps, 30 tbr, 30 tbn
Input #1, image2, from 'file:///Users/johnbandy/Work/Projects/Active/CNCT/XFade/_assets/crosstrekvx-1.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 36486 kb/s
  Stream #1:0: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 960x540, 25 fps, 25 tbr, 25 tbn
Input #2, image2, from 'file:///Users/johnbandy/Work/Projects/Active/CNCT/XFade/_assets/crosstrekvx-2.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 35680 kb/s
  Stream #2:0: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 960x540, 25 fps, 25 tbr, 25 tbn
Stream mapping:
  Stream #0:0 (wrapped_avframe) -> overlay
  Stream #1:0 (mjpeg) -> format:default
  Stream #2:0 (mjpeg) -> format:default
  overlay:default -> Stream #0:0 (libx264)
Press [q] to stop, [?] for help
[swscaler @ 0x140158000] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x120098000] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x130078000] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 2 times
[swscaler @ 0x140598000] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x1302d8000] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 1 times
[libx264 @ 0x138e09080] using SAR=1/1
[libx264 @ 0x138e09080] using cpu capabilities: ARMv8 NEON
[libx264 @ 0x138e09080] profile High, level 3.1, 4:2:0, 8-bit
[libx264 @ 0x138e09080] 264 - core 164 r3095 baee400 - H.264/MPEG-4 AVC codec - Copyleft 2003-2022 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=2 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=0 threads=12 lookahead_threads=4 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=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=10 rc=crf mbtree=1 crf=18.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'all.mp4':
  Metadata:
    encoder         : Lavf60.3.100
  Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv420p(progressive), 960x540 [SAR 1:1 DAR 16:9], q=2-31, 30 fps, 15360 tbn
    Metadata:
      encoder         : Lavc60.3.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame=    0 fps=0.0 q=0.0 size=       0kB time=-577014:32:22.77 bitrate=  -0.0kbits/s speed=N/A    
frame=   32 fps=0.0 q=24.0 size=       0kB time=00:00:01.00 bitrate=   0.3kbits/s speed=1.94x    
frame=   87 fps= 84 q=24.0 size=       0kB time=00:00:02.83 bitrate=   0.1kbits/s speed=2.75x    
frame=  164 fps=107 q=24.0 size=       0kB time=00:00:05.40 bitrate=   0.1kbits/s speed=3.52x    
frame=  812 fps=399 q=24.0 size=     512kB time=00:00:26.96 bitrate= 155.5kbits/s speed=13.3x    
frame= 1821 fps=718 q=24.0 size=     512kB time=00:01:00.60 bitrate=  69.2kbits/s speed=23.9x    
frame= 2469 fps=813 q=24.0 size=     512kB time=00:01:22.23 bitrate=  51.0kbits/s speed=27.1x    
frame= 3421 fps=967 q=24.0 size=     512kB time=00:01:53.96 bitrate=  36.8kbits/s speed=32.2x    
frame= 4522 fps=1120 q=24.0 size=     768kB time=00:02:30.63 bitrate=  41.8kbits/s speed=37.3x    
frame= 5070 fps=1184 q=-1.0 Lsize=     812kB time=00:02:48.90 bitrate=  39.4kbits/s speed=39.5x    
video:769kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 5.626653%
[libx264 @ 0x138e09080] frame I:21    Avg QP: 2.73  size:  3710
[libx264 @ 0x138e09080] frame P:1305  Avg QP: 6.83  size:   449
[libx264 @ 0x138e09080] frame B:3744  Avg QP: 9.07  size:    33
[libx264 @ 0x138e09080] consecutive B-frames:  1.1%  1.4%  0.0% 97.5%
[libx264 @ 0x138e09080] mb I  I16..4: 95.4%  0.7%  3.8%
[libx264 @ 0x138e09080] mb P  I16..4:  0.1%  0.3%  0.1%  P16..4:  2.3%  0.2%  0.1%  0.0%  0.0%    skip:97.0%
[libx264 @ 0x138e09080] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.1%  0.0%  0.0%  direct: 0.1%  skip:99.8%  L0:70.9% L1:27.3% BI: 1.8%
[libx264 @ 0x138e09080] 8x8 transform intra:13.8% inter:71.9%
[libx264 @ 0x138e09080] coded y,uvDC,uvAC intra: 19.1% 12.6% 5.2% inter: 0.3% 0.5% 0.0%
[libx264 @ 0x138e09080] i16 v,h,dc,p: 94%  2%  4%  1%
[libx264 @ 0x138e09080] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  7% 41% 22%  2%  6%  2%  9%  3%  8%
[libx264 @ 0x138e09080] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 11% 32% 16%  2% 11%  4% 12%  3%  8%
[libx264 @ 0x138e09080] i8c dc,h,v,p: 88%  9%  2%  1%
[libx264 @ 0x138e09080] Weighted P-Frames: Y:1.6% UV:1.6%
[libx264 @ 0x138e09080] kb/s:37.25