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• FFMPEG : Extract Audio with exact Timing despite corrupted intermediate audio chunks

  5 novembre 2020, par user2029101

  I have a full automated tool chain which first concatenate video chunks and adjusts user events to it.
This first step uses 3rd party software, I am not able to fix the problem there.
Later in the process I extract the audio from the video. Sometimes there are corrupted audio chunks inbetween. FFMPEG ignores the corrupted parts on extraction. So I got a mutch shorter audio (the linked events rely on the exact length of the org A/V). It wouldnt be a big issue if it would only happen at the end, I know how to pad it there, but at random poistions, I didnt find an option at the documentation doing the job.
The only solution that worked was (pretty dirty I know) to convert the video to another video container with removed video stream and rename the file to MP3/AAC. It was working at windows/Android but all Mac-Browser didnt play it.

  


  The -filter_complex -discard looks promising but I didnt find any good example for the correct syntax.
I have found an Adobe Tool doing the job correctly so I hope there is a way to do with ffmpeg, too.

  


  General
Complete name                  : C:\tmp123\video.mp4
Format                         : MPEG-4
Format profile                 : Base Media
Codec ID                       : isom (isom/iso2/avc1/mp41)
File size                      : 57.8 MiB
Duration                       : 6 min 51 s
Overall bit rate               : 1 177 kb/s
Writing application            : Lavf58.26.100

Video
ID                             : 1
Format                         : AVC
Format/Info                    : Advanced Video Codec
Format profile                 : Baseline@L4
Format settings, CABAC         : No
Format settings, RefFrames     : 2 frames
Format settings, GOP           : M=1, N=30
Codec ID                       : avc1
Codec ID/Info                  : Advanced Video Coding
Duration                       : 6 min 51 s
Bit rate                       : 1 003 kb/s
Width                          : 1 920 pixels
Height                         : 1 080 pixels
Display aspect ratio           : 16:9
Frame rate mode                : Constant
Frame rate                     : 30.303 FPS
Color space                    : YUV
Chroma subsampling             : 4:2:0
Bit depth                      : 8 bits
Scan type                      : Progressive
Bits/(Pixel*Frame)             : 0.016
Stream size                    : 49.2 MiB (85%)

Audio
ID                             : 2
Format                         : AAC
Format/Info                    : Advanced Audio Codec
Format profile                 : LC
Codec ID                       : 40
Duration                       : 6 min 51 s
Bit rate mode                  : Constant
Bit rate                       : 168 kb/s
Channel(s)                     : 2 channels
Channel positions              : Front: L R
Sampling rate                  : 44.1 kHz
Frame rate                     : 43.066 FPS (1024 SPF)
Compression mode               : Lossy
Stream size                    : 8.22 MiB (14%)
Default                        : Yes
Alternate group                : 1


  


• ffmpeg "Underestimated required buffer size"

  10 avril 2021, par Kajuna

  I'm seeing this error on some Windows machine when converting an 8K png stream to ProRes 4444 with ffmpeg. The command looks like

  


  


  ffmpeg -f image2pipe -framerate 30000/1001 -i - -c:v prores_ks -y output.mov

  


  


  And the output

  


  


  ffmpeg version git-2020-06-17-0b3bd00 Copyright (c) 2000-2020 the
FFmpeg developers built with gcc 9.3.1 (GCC) 20200523
  
configuration : —enable-gpl —enable-version3 —enable-sdl2
—enable-fontconfig —enable-gnutls —enable-iconv —enable-libass —enable-libdav1d —enable-libbluray —enable-libfreetype —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libsrt —enable-libtheora —enable-libtwolame —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxml2 —enable-libzimg —enable-lzma —enable-zlib —enable-gmp —enable-libvidstab —enable-libvmaf —enable-libvorbis —enable-libvo-amrwbenc —enable-libmysofa —enable-libspeex —enable-libxvid —enable-libaom —disable-w32threads —enable-libmfx —enable-ffnvcodec —enable-cuda-llvm —enable-cuvid —enable-d3d11va —enable-nvenc —enable-nvdec —enable-dxva2 —enable-avisynth —enable-libopenmpt —enable-amf libavutil 56. 55.100 / 56. 55.100 libavcodec 58. 92.100 / 58. 92.100 libavformat 58. 46.101 / 58. 46.101 libavdevice 58. 11.100 / 58. 11.100 libavfilter 7. 86.100 / 7. 86.100 libswscale 5. 8.100 /
5. 8.100 libswresample 3. 8.100 / 3. 8.100 libpostproc 55. 8.100 / 55. 8.100 [image2pipe @ 000002245a96da40] Stream #0 : not enough frames to estimate rate ; consider increasing probesize Input
#0, image2pipe, from 'pipe :' : Duration : N/A, bitrate : N/A
Stream #0:0 : Video : png, rgba(pc), 7680x3840, 29.97 tbr, 29.97 tbn, 29.97 tbc Stream mapping : Stream #0:0 -> #0:0 (png (native) ->
prores (prores_ks)) frame= 0 fps=0.0 q=0.0 size= 0kB
time=-577014:32:22.77 bitrate= -0.0kbits/s speed=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= 0 fps=0.0 q=0.0 size= 0kB time=-577014:32:22.77 bitrate= -0.0kbits/s speed=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= 0 fps=0.0 q=0.0 size= 0kB time=-577014:32:22.77 bitrate= -0.0kbits/s speed=N/A [prores_ks @
000002245aaaf080] Autoselected 4:4:4:4 profile because of the used
input colorspace. It can be overridden through -profile option.
[prores_ks @ 000002245aaaf700] Autoselected 4:4:4:4 profile because of
the used input colorspace. It can be overridden through -profile
option. [prores_ks @ 000002245aa1e7c0] Autoselected 4:4:4:4 profile
because of the used input colorspace. It can be overridden through
-profile option. [prores_ks @ 000002245aa1d580] Autoselected 4:4:4:4 profile because of the used input colorspace. It can be overridden
through -profile option. [prores_ks @ 000002245aa1ec40] Autoselected
4:4:4:4 profile because of the used input colorspace. It can be
overridden through -profile option. [prores_ks @ 000002245aa1da00]
Autoselected 4:4:4:4 profile because of the used input colorspace. It
can be overridden through -profile option. [prores_ks @
000002245aa1f540] Autoselected 4:4:4:4 profile because of the used
input colorspace. It can be overridden through -profile option.
[prores_ks @ 000002245aa1de80] Autoselected 4:4:4:4 profile because of
the used input colorspace. It can be overridden through -profile
option. [prores_ks @ 000002245a972b40] Autoselected 4:4:4:4 profile
because of the used input colorspace. It can be overridden through
-profile option. Output #0, mov, to 'output.mov' : Metadata :
encoder : Lavf58.46.101
Stream #0:0 : Video : prores (prores_ks) (ap4h / 0x68347061), yuva444p10le, 7680x3840, q=2-31, 200 kb/s, 29.97 fps, 30k tbn, 29.97
tbc
Metadata :
encoder : Lavc58.92.100 prores_ks frame= 1 fps=0.2 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x
  
frame= 2 fps=0.3 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A
speed= 0x frame= 3 fps=0.4 q=0.0 size= 0kB
time=00:00:00.00 bitrate=N/A speed= 0x frame= 4 fps=0.4 q=0.0
size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x frame=
  
5 fps=0.5 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed=
  
0x [prores_ks @ 000002245aaaf080] Underestimated required buffer
size. Video encoding failed [prores_ks @ 000002245aaaf700]
Underestimated required buffer size. [prores_ks @ 000002245aa1e7c0]
Underestimated required buffer size. [prores_ks @ 000002245aa1d580]
Underestimated required buffer size. [prores_ks @ 000002245aa1ec40]
Underestimated required buffer size. [prores_ks @ 000002245aa1da00]
Underestimated required buffer size. Conversion failed !

  


  


  How could I debug this considering I don't have access to the problematic machine (a user does) ? Could the "not enough frames to estimate rate ; consider increasing probesize" message be related to the problem ?

  


  Thanks

  


  Edit : I increased probesize and that warning disappeared, but the conversion keeps failing with the same error message "Underestimated required buffer size". I can now reproduce this on one of my Windows machines.

  


  Edit 2 : Not a solution but I found out that this problem is gone if using ffmpeg 4.2.3 and was introduced with 4.3

  


• How to remove "Writing library" from .mp3 ?

  15 mars 2021, par WarNight

  I am trying to encode .mp3 without encoder information ("Writing library"), but it fails.
I already try :

  


  

  1. ffmpeg -i test.wav -map_metadata -1 -map_chapters -1 test.mp3

  


  2. ffmpeg -i test.wav -write_xing 0 -id3v2_version 0 test.mp3

  


  


  and

  


  

  3. ffmpeg -i test.wav -write_xing 0 -id3v2_version 0 -map_metadata -1 -map_chapters -1 test.mp3

  


  


  but "Writing library : LAME3.100" still exists...

  


  General
Complete name               : C:\Users\User\Videos\test.mp3
Format                      : MPEG Audio
File size                   : 1 010 KiB
Duration                    : 1 min 4 s
Overall bit rate mode       : Constant
Overall bit rate            : 128 kb/s
Writing library             : LAME3.100

Audio
Format                      : MPEG Audio
Format version              : Version 1
Format profile              : Layer 3
Format settings             : Joint stereo / MS Stereo
Duration                    : 1 min 4 s
Bit rate mode               : Constant
Bit rate                    : 128 kb/s
Channel(s)                  : 2 channels
Sampling rate               : 48.0 kHz
Frame rate                  : 41.667 FPS (1152 SPF)
Compression mode            : Lossy
Stream size                 : 1 010 KiB (100%)
Writing library             : LAME3.100


  


  What do I need to do to remove this metadata ?
(Writing library)