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  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
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    MediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
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  • ffmpeg messing up audio when copying PCM streams

    2 juin 2022, par lioumens

    I'm using ffmpeg to compress videos, but when trying to copy the audio stream from one video file using the same codec and container, the audio is completely corrupted and unusable.

    


    The video I'm trying to compress has stream data :

    


    $ ffprobe -hide_banner -i testing.mov
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'testing.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 0
    compatible_brands: qt
    creation_time   : 2019-04-25T05:37:35.000000Z
    com.apple.quicktime.make: Apple
    com.apple.quicktime.model: MacBookPro15,2
    com.apple.quicktime.software: Mac OS X 10.14.2 (18C54)
    com.apple.quicktime.creationdate: 2019-04-25T00:28:40-0500
  Duration: 00:06:35.75, start: 0.000000, bitrate: 66117 kb/s
  Stream #0:0[0x1](und): Video: prores (Standard) (apcn / 0x6E637061), yuv422p10le(tv, smpte170m/bt709/bt709, progressive), 1280x720, 65923 kb/s, 29.01 fps, 29.01 tbr, 30k tbn (default)
    Metadata:
      creation_time   : 2019-04-25T05:37:35.000000Z
      handler_name    : Core Media Video
      vendor_id       : appl
      encoder         : Apple ProRes 422
  Stream #0:1[0x2](und): Audio: pcm_s16be (lpcm / 0x6D63706C), 8000 Hz, 1 channels, s16, 128 kb/s (default)
    Metadata:
      creation_time   : 2019-04-25T05:37:35.000000Z
      handler_name    : Core Media Audio
      vendor_id       : [0][0][0][0]


    


    Just working with the audio, I tried to copy the audio into a separate file with ffmpeg -i testing.mov -vn -channel_layout mono -c:a copy tmp.mov, which results in a video file with stream data :

    


    $ ffprobe -hide_banner -i tmp.mov
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'tmp.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 512
    compatible_brands: qt
    encoder         : Lavf59.16.100
  Duration: 00:06:35.26, start: 0.018000, bitrate: 128 kb/s
  Stream #0:0[0x1]: Audio: pcm_s16be (twos / 0x736F7774), 8000 Hz, mono, s16, 128 kb/s (default)
    Metadata:
      handler_name    : Core Media Audio
      vendor_id       : [0][0][0][0]


    


    It seems the only difference when copying the audio is the original says pcm_s16be (lpcm / 0x6D63706C) while the resulting audio has pcm_s16be (twos / 0x736F7774). My understanding is that twos is Apple Quicktime's FOURCC identifier for signed 16 bit big-endian., which is correct and shouldn't affect the audio.

    


    It seems another forum user had a similar issue, but they were using a hex editor to directly manipulate bits, which I'm not comfortable doing. Is there a fix from within ffmpeg ?

    


    EDIT :
I've uploaded a sample of the clip that has this problem.

    


  • How to generate pcm audio file by setting 20 bit depth ?

    6 juillet 2015, par vip007

    No option using ffmpeg

    I am using ffmpeg to generate audio data. I am using following command

    ffmpeg.exe -i in.wav -ar 44100  -acodec pcm_s16le  -ac 1 out.wav

    but there is no option to convert to 20 bit depth pcm audio. (something like pcm_s20le).

    I want to perform some operations on apple codec (e.g. encoding pcm audio data to alac).

    On ALAC source : http://alac.macosforge.org/trac/browser/trunk/ReadMe.txt , it has been mentioned like this ;

    Apple Lossless supports the following features
    1. Bit depths 16, 20, 24 and 32 bits.

    Media Foundation on windows throwing exception for 20 bit depth

    I tried sample encoding and transcoding application mentioned on MSDN https://code.msdn.microsoft.com/windowsapps/media-transcode-sample-f7ba5269

    with following configuration but it failed

    spTypeOut->SetUINT32(MF_MT_AUDIO_BITS_PER_SAMPLE, 20);  

    NOTE : but i put 16 instead of 20 ; it created smoothly.

    Is there any way to generate such 20 bit PCM audio ? What is so special about 20 bit depth that it is not being considered on ffmpeg and media foundation but on apple codec ?

  • ffmpeg export multichannel audio -map

    8 avril 2014, par speedyrazor

    I am trying to export all audio channels from a multichannel quicktime file with ffmpeg which has the following audio configuration, but am unsure if the command below is correct. All the files look and play correct in Quicktime player except the L+R_Total.wav which refuses to play in Quicktime player but plays fine in VLC, so not sure if i'm using the wrong command :

    Track 1 - mono
    
Track 2 - mono
    
Track 3 - mono
    
Track 4 - mono
    
Track 5 - mono
    
Track 6 - mono
    
Track 7 - stereo

    I am using :

    /Users/me/Desktop/python/ffmpeg/ffmpeg -i /Users/me/Desktop/test.mov -acodec pcm_s24le -map 0:1 -y Left.wav -acodec pcm_s24le -map 0:2 Right.wav -acodec pcm_s24le -map 0:3 Center.wav -acodec pcm_s24le -map 0:4 LFE.wav -acodec pcm_s24le -map 0:5 Left_Surround.wav -acodec pcm_s24le -map 0:6 Right_Surround.wav -acodec pcm_s24le -map 0:7 Left+Right_Total.wav

    Here is the printout from the terminal :

        MacBook-Pro:~ me$ /Users/me/Desktop/python/ffmpeg/ffmpeg -i /Users/me/Desktop/test.mov -acodec pcm_s24le -map 0:1 -y Left.wav -acodec pcm_s24le -map 0:2 Right.wav -acodec pcm_s24le -map 0:3 Center.wav -acodec pcm_s24le -map 0:4 LFE.wav -acodec pcm_s24le -map 0:5 Left_Surround.wav -acodec pcm_s24le -map 0:6 Right_Surround.wav -acodec pcm_s24le -map 0:7 Left+Right_Total.wav
    
ffmpeg version 2.2 Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Mar 25 2014 15:00:55 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
    
  configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl --enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-avfilter --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters --enable-libgsm --arch=x86_64 --enable-runtime-cpudetect
    
  libavutil      52. 66.100 / 52. 66.100
    
  libavcodec     55. 52.102 / 55. 52.102
    
  libavformat    55. 33.100 / 55. 33.100
    
  libavdevice    55. 10.100 / 55. 10.100
    
  libavfilter     4.  2.100 /  4.  2.100
    
  libswscale      2.  5.102 /  2.  5.102
    
  libswresample   0. 18.100 /  0. 18.100
    
  libpostproc    52.  3.100 / 52.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/me/Desktop/test.mov':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 537199360
    
    compatible_brands: qt  
    
    creation_time   : 2014-03-06 11:25:34
    
  Duration: 00:01:03.48, start: 0.000000, bitrate: 153967 kb/s
    
    Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le, 1920x1080, 144704 kb/s, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 23976 tbn, 23976 tbc (default)
    
    Metadata:
    
      creation_time   : 2014-03-06 11:25:34
    
      handler_name    : Apple Alias Data Handler
    
      timecode        : 00:00:00:00
    
    Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels (FL), s32, 1152 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-03-06 11:25:34
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:2(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels (FR), s32, 1152 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-03-06 11:25:34
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:3(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32, 1152 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-03-06 11:25:34
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:4(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels (LFE), s32, 1152 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-03-06 11:25:34
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:5(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels (BL), s32, 1152 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-03-06 11:25:34
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:6(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 channels (BR), s32, 1152 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-03-06 11:25:34
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:7(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, downmix, s32, 2304 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-03-06 11:25:34
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:8(eng): Data: none (tmcd / 0x64636D74) (default)
    
    Metadata:
    
      creation_time   : 2014-03-06 11:26:04
    
      handler_name    : Apple Alias Data Handler
    
      timecode        : 00:00:00:00
    
Output #0, wav, to 'Left.wav':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 537199360
    
    compatible_brands: qt  
    
    ISFT            : Lavf55.33.100
    
    Stream #0:0(eng): Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, 1 channels (FL), s32, 1152 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-03-06 11:25:34
    
      handler_name    : Apple Alias Data Handler
    
Output #1, wav, to 'Right.wav':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 537199360
    
    compatible_brands: qt  
    
    ISFT            : Lavf55.33.100
    
    Stream #1:0(eng): Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, 1 channels (FR), s32, 1152 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-03-06 11:25:34
    
      handler_name    : Apple Alias Data Handler
    
Output #2, wav, to 'Center.wav':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 537199360
    
    compatible_brands: qt  
    
    ISFT            : Lavf55.33.100
    
    Stream #2:0(eng): Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, mono, s32, 1152 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-03-06 11:25:34
    
      handler_name    : Apple Alias Data Handler
    
Output #3, wav, to 'LFE.wav':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 537199360
    
    compatible_brands: qt  
    
    ISFT            : Lavf55.33.100
    
    Stream #3:0(eng): Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, 1 channels (LFE), s32, 1152 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-03-06 11:25:34
    
      handler_name    : Apple Alias Data Handler
    
Output #4, wav, to 'Left_Surround.wav':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 537199360
    
    compatible_brands: qt  
    
    ISFT            : Lavf55.33.100
    
    Stream #4:0(eng): Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, 1 channels (BL), s32, 1152 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-03-06 11:25:34
    
      handler_name    : Apple Alias Data Handler
    
Output #5, wav, to 'Right_Surround.wav':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 537199360
    
    compatible_brands: qt  
    
    ISFT            : Lavf55.33.100
    
    Stream #5:0(eng): Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, 1 channels (BR), s32, 1152 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-03-06 11:25:34
    
      handler_name    : Apple Alias Data Handler
    
Output #6, wav, to 'Left+Right_Total.wav':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 537199360
    
    compatible_brands: qt  
    
    ISFT            : Lavf55.33.100
    
    Stream #6:0(eng): Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, downmix, s32, 2304 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-03-06 11:25:34
    
      handler_name    : Apple Alias Data Handler
    
Stream mapping:
    
  Stream #0:1 -> #0:0 (pcm_s24le -> pcm_s24le)
    
  Stream #0:2 -> #1:0 (pcm_s24le -> pcm_s24le)
    
  Stream #0:3 -> #2:0 (pcm_s24le -> pcm_s24le)
    
  Stream #0:4 -> #3:0 (pcm_s24le -> pcm_s24le)
    
  Stream #0:5 -> #4:0 (pcm_s24le -> pcm_s24le)
    
  Stream #0:6 -> #5:0 (pcm_s24le -> pcm_s24le)
    
  Stream #0:7 -> #6:0 (pcm_s24le -> pcm_s24le)
    
Press [q] to stop, [?] for help
    
size=    8927kB time=00:01:03.48 bitrate=1152.0kbits/s    
    
video:0kB audio:71415kB subtitle:0 data:0 global headers:0kB muxing overhead -87.499863%

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