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• FFmpeg : High pitched audio when converting AVI video to MP4 [closed]

  15 août 2023, par Karen S

  I'm pretty new to FFmpeg and I'm having trouble converting a video from AVI format to MP4. I'm trying to convert pcm_s16le to aac but the resulting audio is very high pitched and choppy.

  


  The AVI video has two audio streams :

  


  Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Stream #0:2: Audio: pcm_s16le, 32000 Hz, stereo, s16, 1024 kb/s


  


  In VLC Media Player the video plays fine and it uses the second audio stream.

  


  When I run ffmpeg -i input.avi -vcodec libx264 -crf 27 output.mp4 in my terminal, the output audio in the MP4 file sounds extremely choppy and the voices are chipmunk-like.
This is the codec information for the audio stream in VLC after the conversion :

  


  Codec: MPEG AAC Audio (mp4a)
Type: Audio
Channels: Stereo
Sample rate: 48000 Hz
Bits per sample: 32


  


  This is the terminal output :

  


  ffmpeg version 2023-06-11-git-09621fd7d9-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12.2.0 (Rev10, 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-libaribcaption --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-libcodec2 --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      58. 13.100 / 58. 13.100
  libavcodec     60. 17.100 / 60. 17.100
  libavformat    60.  6.100 / 60.  6.100
  libavdevice    60.  2.100 / 60.  2.100
  libavfilter     9.  8.101 /  9.  8.101
  libswscale      7.  3.100 /  7.  3.100
  libswresample   4. 11.100 /  4. 11.100
  libpostproc    57.  2.100 / 57.  2.100
[avi @ 000001d1b05ffbc0] Switching to NI mode, due to poor interleaving
Input #0, avi, from 'VG2002-06-10 TAPE_71 001.avi':
  Duration: 00:10:40.64, start: 0.000000, bitrate: 28852 kb/s
  Stream #0:0: Video: dvvideo, yuv411p, 720x480 [SAR 32:27 DAR 16:9], 25000 kb/s, SAR 8:9 DAR 4:3, 60k fps, 29.97 tbr, 60k tbn
  Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
  Stream #0:2: Audio: pcm_s16le, 32000 Hz, stereo, s16, 1024 kb/s
File 'VG2002-06-10compress.mp4' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (dvvideo (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[pcm_s16le @ 000001d1b0696680] This decoder does not support parameter changes, but PARAM_CHANGE side data was sent to it.
[pcm_s16le @ 000001d1b0696680] Error applying parameter changes.
[libx264 @ 000001d1b0ab4940] using SAR=8/9
[libx264 @ 000001d1b0ab4940] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 000001d1b0ab4940] profile High 4:2:2, level 3.0, 4:2:2, 8-bit
[libx264 @ 000001d1b0ab4940] 264 - core 164 r3107 a8b68eb - H.264/MPEG-4 AVC codec - Copyleft 2003-2023 - 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=27.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'VG2002-06-10compress.mp4':
  Metadata:
    encoder         : Lavf60.6.100
  Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv422p(tv, bottom coded first (swapped)), 720x480 [SAR 8:9 DAR 4:3], q=2-31, 29.97 fps, 30k tbn
    Metadata:
      encoder         : Lavc60.17.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
  Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc60.17.100 aac
[dvvideo @ 000001d1b0a26f00] Concealing bitstream errors.49 bitrate=1424.2kbits/s speed=2.51x
    Last message repeated 76 times
[dvvideo @ 000001d1b0f61680] Concealing bitstream errors.23 bitrate=1451.5kbits/s speed=2.47x
    Last message repeated 19 times
[out#0/mp4 @ 000001d1b0696c80] video:106080kB audio:6745kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.465412%
frame=19200 fps= 73 q=-1.0 Lsize=  113351kB time=00:10:40.60 bitrate=1449.5kbits/s speed=2.43x
[libx264 @ 000001d1b0ab4940] frame I:99    Avg QP:26.85  size: 42388
[libx264 @ 000001d1b0ab4940] frame P:4922  Avg QP:29.69  size: 13724
[libx264 @ 000001d1b0ab4940] frame B:14179 Avg QP:33.82  size:  2601
[libx264 @ 000001d1b0ab4940] consecutive B-frames:  1.2%  0.8%  1.1% 97.0%
[libx264 @ 000001d1b0ab4940] mb I  I16..4: 12.2% 77.3% 10.4%
[libx264 @ 000001d1b0ab4940] mb P  I16..4:  1.7%  8.1%  1.4%  P16..4: 39.9% 16.6% 12.2%  0.0%  0.0%    skip:20.1%
[libx264 @ 000001d1b0ab4940] mb B  I16..4:  0.3%  0.6%  0.1%  B16..8: 38.6%  3.8%  1.1%  direct: 3.3%  skip:52.2%  L0:42.2% L1:49.3% BI: 8.5%
[libx264 @ 000001d1b0ab4940] 8x8 transform intra:71.6% inter:71.6%
[libx264 @ 000001d1b0ab4940] coded y,uvDC,uvAC intra: 72.3% 66.8% 11.7% inter: 17.3% 10.6% 0.2%
[libx264 @ 000001d1b0ab4940] i16 v,h,dc,p: 11% 64%  7% 17%
[libx264 @ 000001d1b0ab4940] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 11% 26% 24%  5%  6%  5%  9%  5%  9%
[libx264 @ 000001d1b0ab4940] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  8% 52% 13%  3%  5%  4%  7%  3%  6%
[libx264 @ 000001d1b0ab4940] i8c dc,h,v,p: 58% 21% 17%  5%
[libx264 @ 000001d1b0ab4940] Weighted P-Frames: Y:3.5% UV:1.3%
[libx264 @ 000001d1b0ab4940] ref P L0: 51.9% 15.0% 23.5%  9.3%  0.3%
[libx264 @ 000001d1b0ab4940] ref B L0: 87.5%  9.7%  2.9%
[libx264 @ 000001d1b0ab4940] ref B L1: 95.1%  4.9%
[libx264 @ 000001d1b0ab4940] kb/s:1356.46
[aac @ 000001d1b0a6ab80] Qavg: 517.695


  


  FFmpeg automatically selects the first audio stream to encode but then this error comes up :

  


  [pcm_s16le @ 000001d1b0696680] This decoder does not support parameter changes, but PARAM_CHANGE side data was sent to it.


  


  To bypass this error, I've edited the FFmpeg command so that the second stream is selected instead for aac encoding, but then the resulting MP4 video is silent.

  


  Does anyone know why FFmpeg is unable to convert the original AVI audio to aac without it sounding higher-pitched ? I think that the sample rate of the first stream might be set incorrectly but I'm not too sure how to fix it so that the encoder reads it properly.

  


• Revision 92a7cfc8bf : Adaptively adjust mode test kick-off thresholds in RTC coding This commit allow

  24 novembre 2014, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_pickmode.c

  
  
  Adaptively adjust mode test kick-off thresholds in RTC coding

  This commit allows the encoder to increase the mode test kick-off
  thresholds if the previous best mode renders all zero quantized
  coefficients, thereby saving motion search runs when possible.
  The compression performance of speed -5 and -6 is down by -0.446%
  and 0.591%, respectively. The runtime of speed -6 is improved by
  10% for many test clips.

  vidyo1, 1000 kbps
  16578 b/f, 40.316 dB, 7873 ms -> 16575 b/f, 40.262 dB, 7126 ms

  nik720p, 1000 kbps
  33311 b/f, 38.651 dB, 7263 ms -> 33304 b/f, 38.629 dB, 6865 ms

  dark720p, 1000 kbps
  33331 b/f, 39.718 dB, 13596 ms -> 33324 b/f, 39.651 dB, 12000 ms

  mmoving, 1000 kbps
  33263 b/f, 40.983 dB, 7566 ms -> 33259 b/f, 40.978 dB, 7531 ms

  Change-Id : I7591617ff113e91125ec32c9b853e257fbc41d90

• Revision 7e40a55ef9 : Added high bitdepth sse2 transform functions Also removes some spurious changes

  24 octobre 2014, par Peter de Rivaz

  Changed Paths :
   Modify /test/dct16x16_test.cc

  
   Modify /test/dct32x32_test.cc

  
   Modify /test/fdct4x4_test.cc

  
   Modify /test/fdct8x8_test.cc

  
   Modify /vp9/common/vp9_blockd.h

  
   Modify /vp9/common/vp9_rtcd_defs.pl

  
   Modify /vp9/common/x86/vp9_idct_intrin_sse2.c

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/x86/vp9_dct32x32_sse2.c

  
   Add /vp9/encoder/x86/vp9_dct_impl_sse2.c

  
   Modify /vp9/encoder/x86/vp9_dct_mmx.asm

  
   Modify /vp9/encoder/x86/vp9_dct_sse2.c

  
   Add /vp9/encoder/x86/vp9_dct_sse2.h

  
   Modify /vp9/vp9cx.mk

  
  
  Added high bitdepth sse2 transform functions

  Also removes some spurious changes in common/vp9_blockd.h which
  was introduced by a rebase issue between nextgen and master branches.

  Change-Id : If359f0e9a71bca9c2ba685a87a355873536bb282
  (cherry picked from commit 005d80cd05269a299cd2f7ddbc3d4d8b791aebba)
  (cherry picked from commit 08d2f548007fd8d6fd41da8ef7fdb488b6485af3)
  (cherry picked from commit 4230c2306c194c058f56433a5275aa02a2e71d56)