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  • Mise à jour de la version 0.1 vers 0.2

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    Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
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Sur d’autres sites (3872)

  • Ffmpeg/Fluent-Ffmpeg : Output File Does Not Reflect Input Parameters

    17 août 2017, par Code Sherpa

    Use Case

    When a user records an audio file and uploads to firebase storage, run a trigger that crops a clip of that file and saves it to a "preview" directory.

    Problem

    When the file arrives on the server, it is just dead air before the start time (10 seconds) and then doesn’t stop after the duration of 10 seconds is exceeded. Whatever I put in the "-t" and "-ss" arguments seems to have no impact on the output file - not cropping correctly.

    Environment

    • mac client / firebase storage
    • node v8.1.0
    • ffmpeg v3.2.2
    • fluent-ffmpeg v2.1.2

    Node Code

      var command = new ffmpeg({ source: tempFilePath, timeout: 0 })
    
      .setFfmpegPath(ffmpegPath)
    
      .setFfprobePath(ffprobePath)
    
      .inputOption('-t', '10')
    
      .inputOption('-ss', '10')
    
      .outputOption('-acodec', 'copy')
    
      .on('start', function(commandLine) {
    
            console.log('Spawned Ffmpeg with command: ', commandLine);
    
       })
    
      .on('end', function() {
    
          console.log('Preview file cropping done successfully');
    
       })
    
      .on('error', function(err, stdout, stderr) {
    
          var build = err;
    
          if (!stdout === '') { build = build + '\n' + stdout; }
    
          build = build + '\n' + stderr;
    

    
          console.log(build);
    
       }).save(tempFilePath);

    Ffmpeg Command

    Spawned Ffmpeg with command : ffmpeg -t 10 -i
    /tmp/2EB100B0-6C1E-4D51-9087-764CA653AFC720170711232034.aac -y -acodec
    aac /tmp/2EB100B0-6C1E-4D51-9087-764CA653AFC720170711232034.aac

    Console Output

     $ ffmpeg -t 10 -i E506FE2E-DC81-4DD8-B751-211F7FD9A25820170816160502.aac -y -acodec aac output.aac -loglevel debug
    
ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers
    
  built 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 --enable-libvidstab --enable-libx265 --disable-doc --arch=x86_64 --enable-runtime-cpudetect
    
  libavutil      55. 34.100 / 55. 34.100
    
  libavcodec     57. 64.101 / 57. 64.101
    
  libavformat    57. 56.100 / 57. 56.100
    
  libavdevice    57.  1.100 / 57.  1.100
    
  libavfilter     6. 65.100 /  6. 65.100
    
  libswscale      4.  2.100 /  4.  2.100
    
  libswresample   2.  3.100 /  2.  3.100
    
  libpostproc    54.  1.100 / 54.  1.100
    
Splitting the commandline.
    
Reading option '-t' ... matched as option 't' (record or transcode "duration" seconds of audio/video) with argument '10'.
    
Reading option '-i' ... matched as input url with argument 'E506FE2E-DC81-4DD8-B751-211F7FD9A25820170816160502.aac'.
    
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
    
Reading option '-acodec' ... matched as option 'acodec' (force audio codec ('copy' to copy stream)) with argument 'aac'.
    
Reading option 'output.aac' ... matched as output url.
    
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
    
Finished splitting the commandline.
    
Parsing a group of options: global .
    
Applying option y (overwrite output files) with argument 1.
    
Applying option loglevel (set logging level) with argument debug.
    
Successfully parsed a group of options.
    
Parsing a group of options: input url E506FE2E-DC81-4DD8-B751-211F7FD9A25820170816160502.aac.
    
Applying option t (record or transcode "duration" seconds of audio/video) with argument 10.
    
Successfully parsed a group of options.
    
Opening an input file: E506FE2E-DC81-4DD8-B751-211F7FD9A25820170816160502.aac.
    
[file @ 0x7fe42f700420] Setting default whitelist 'file,crypto'
    
[aac @ 0x7fe431000000] Format aac probed with size=2048 and score=51
    
[aac @ 0x7fe431000000] Before avformat_find_stream_info() pos: 0 bytes read:32928 seeks:4 nb_streams:1
    
[aac @ 0x7fe431000000] All info found
    
[aac @ 0x7fe431000000] Estimating duration from bitrate, this may be inaccurate
    
[aac @ 0x7fe431000000] After avformat_find_stream_info() pos: 37888 bytes read:98464 seeks:4 frames:50
    
Input #0, aac, from 'E506FE2E-DC81-4DD8-B751-211F7FD9A25820170816160502.aac':
    
  Duration: 00:01:24.28, bitrate: 335 kb/s
    
    Stream #0:0, 50, 1/28224000: Audio: aac (LC), 44100 Hz, stereo, fltp, 335 kb/s
    
Successfully opened the file.
    
Parsing a group of options: output url output.aac.
    
Applying option acodec (force audio codec ('copy' to copy stream)) with argument aac.
    
Successfully parsed a group of options.
    
Opening an output file: output.aac.
    
[file @ 0x7fe42f7016e0] Setting default whitelist 'file,crypto'
    
Successfully opened the file.
    
detected 4 logical cores
    
[graph 0 input from stream 0:0 @ 0x7fe42f701880] Setting 'time_base' to value '1/44100'
    
[graph 0 input from stream 0:0 @ 0x7fe42f701880] Setting 'sample_rate' to value '44100'
    
[graph 0 input from stream 0:0 @ 0x7fe42f701880] Setting 'sample_fmt' to value 'fltp'
    
[graph 0 input from stream 0:0 @ 0x7fe42f701880] Setting 'channel_layout' to value '0x3'
    
[graph 0 input from stream 0:0 @ 0x7fe42f701880] tb:1/44100 samplefmt:fltp samplerate:44100 chlayout:0x3
    
[audio format for output stream 0:0 @ 0x7fe42f702060] Setting 'sample_fmts' to value 'fltp'
    
[audio format for output stream 0:0 @ 0x7fe42f702060] Setting 'sample_rates' to value '96000|88200|64000|48000|44100|32000|24000|22050|16000|12000|11025|8000|7350'
    
[AVFilterGraph @ 0x7fe42f6101a0] query_formats: 5 queried, 12 merged, 0 already done, 0 delayed
    
Output #0, adts, to 'output.aac':
    
  Metadata:
    
    encoder         : Lavf57.56.100
    
    Stream #0:0, 0, 1/44100: Audio: aac (LC), 44100 Hz, stereo, fltp, delay 1024, 128 kb/s
    
    Metadata:
    
      encoder         : Lavc57.64.101 aac
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (aac (native) -> aac (native))
    
Press [q] to stop, [?] for help
    
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
    
    Last message repeated 1 times
    
[output stream 0:0 @ 0x7fe42f701ee0] EOF on sink link output stream 0:0:default.
    
No more output streams to write to, finishing.
    
[aac @ 0x7fe431001200] Trying to remove 344 more samples than there are in the queue
    
size=     160kB time=00:00:10.00 bitrate= 130.9kbits/s speed=20.2x    
    
video:0kB audio:157kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.881580%
    
Input file #0 (E506FE2E-DC81-4DD8-B751-211F7FD9A25820170816160502.aac):
    
  Input stream #0:0 (audio): 432 packets read (398208 bytes); 432 frames decoded (442368 samples); 
    
  Total: 432 packets (398208 bytes) demuxed
    
Output file #0 (output.aac):
    
  Output stream #0:0 (audio): 431 frames encoded (441000 samples); 432 packets muxed (160716 bytes); 
    
  Total: 432 packets (160716 bytes) muxed
    
432 frames successfully decoded, 0 decoding errors
    
[AVIOContext @ 0x7fe42f611040] Statistics: 0 seeks, 432 writeouts
    
[aac @ 0x7fe431001200] Qavg: 4508.253
    
[AVIOContext @ 0x7fe42f7004c0] Statistics: 458912 bytes read, 4 seeks

  • FFmpeg command to capture Audio from Android mobile

    24 novembre 2023, par Uday

    I'm trying to capture Audio from my Android mobile using FFmpeg.
Tried the below commands and the recorded clip has no Audio in it, it's just a dark black screen with no audio/video.

    


    Basically, I want to stream the live microphone audio to the RTSP server

    


    Given all Android permission for the microphone & camera.

    


    Lib used : ffmpeg_kit_flutter

    


    Here are the commands which I tried :

    


     FFmpegKit.execute('-y -f android_camera -i 0:1 -r 30 -c:a aac -f rtsp -rtsp_transport tcp "$Url"');


    


    Command :

    


    FFmpegKit.execute('-y -f android_camera -i 0:1 -r 30 -c:a libmp3lame -qscale:a 2 "/storage/emulated/0/Download/androidvideo.mp3"');

FFmpegKit.execute('-y -f android_camera -i 0:0 -r 30 -c:a wavpack -b:a 64k "/storage/emulated/0/Download/androidvideo.wav"');


    


    This command records video but no audio in it

    


    FFmpegKit.execute('-video_size hd720 -f android_camera -camera_index 1 -i anything -r 10 -t 00:00:15 "$dir/androidvideo.mp4”');


    


    Response

    


    I/flutter (22881): Loading ffmpeg-kit-flutter.
D/ffmpeg-kit-flutter(22881): FFmpegKitFlutterPlugin com.arthenica.ffmpegkit.flutter.FFmpegKitFlutterPlugin@7f3db78 started listening to events on io.flutter.plugin.common.EventChannel$IncomingStreamRequestHandler$EventSinkImplementation@518a6b1.
I/flutter (22881): Loaded ffmpeg-kit-flutter-android-https-arm64-v8a-5.1.0.
D/VendorTagDescriptor(22881): addVendorDescriptor: vendor tag id 3854507339 added
W/MapperHal(22881): buffer descriptor with invalid usage bits 0x202000
D/ViewRootImpl@53a7452[FlutterFragmentActivity](22881): ViewPostIme pointer 1
W/ACameraCaptureSession(22881): Device is closed but session 0 is not notified
I/flutter (22881): logs:ffmpeg version n5.1.2
I/flutter (22881): logs: Copyright (c) 2000-2022 the FFmpeg developers
I/flutter (22881): logs:
I/flutter (22881): logs:  built with Android (7155654, based on r399163b1) clang version 11.0.5 (https://android.googlesource.com/toolchain/llvm-project 87f1315dfbea7c137aa2e6d362dbb457e388158d)
I/flutter (22881): logs:  configuration: --cross-prefix=aarch64-linux-android- --sysroot=/files/android-sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/taner/Projects/ffmpeg-kit/prebuilt/android-arm64/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --target-os=android --enable-neon --enable-asm --enable-inline-asm --ar=aarch64-linux-android-ar --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --ranlib=aarch64-linux-android-ranlib --strip=aarch64-linux-android-strip --nm=aarch64-linux-android-nm --extra-libs='-L/home/taner/Projects/ffmpeg-kit/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --disable-autodetect --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --disable-static --enable-shared --enable-pthreads --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --
I/flutter (22881): logs:  libavutil      57. 28.100 / 57. 28.100
I/flutter (22881): logs:  libavcodec     59. 37.100 / 59. 37.100
I/flutter (22881): logs:  libavformat    59. 27.100 / 59. 27.100
I/flutter (22881): logs:  libavdevice    59.  7.100 / 59.  7.100
I/flutter (22881): logs:  libavfilter     8. 44.100 /  8. 44.100
I/flutter (22881): logs:  libswscale      6.  7.100 /  6.  7.100
I/flutter (22881): logs:  libswresample   4.  7.100 /  4.  7.100
I/flutter (22881): logs:[android_camera @ 0x7450bb2f80] Requested video_size 0x0 not available, falling back to 4032x3024
I/flutter (22881): logs:Input #0, android_camera, from '0:0':
I/flutter (22881): logs:  Duration: 
I/flutter (22881): logs:N/A
I/flutter (22881): logs:, start: 
I/flutter (22881): logs:299109.760553
I/flutter (22881): logs:, bitrate: 
I/flutter (22881): logs:N/A
I/flutter (22881): logs:
I/flutter (22881): logs:  Stream #0:0
I/flutter (22881): logs:: Video: rawvideo (NV21 / 0x3132564E), nv21, 4032x3024
I/flutter (22881): logs:, 
I/flutter (22881): logs:30 fps, 
I/flutter (22881): logs:30 tbr, 
I/flutter (22881): logs:1000000000.00 tbn
I/flutter (22881): logs:
I/flutter (22881): logs:    Side data:
I/flutter (22881): logs:      
I/flutter (22881): logs:displaymatrix: rotation of -90.00 degrees
I/flutter (22881): logs:
I/flutter (22881): logs:Stream mapping:
I/flutter (22881): logs:  Stream #0:0 -> #0:0
I/flutter (22881): logs: (rawvideo (native) -> mpeg4 (native))
I/flutter (22881): logs:
I/flutter (22881): logs:Press [q] to stop, [?] for help
I/flutter (22881): logs:Output #0, mp4, to '/storage/emulated/0/Download/androidvideo.mp4':
I/flutter (22881): logs:  Metadata:
I/flutter (22881): logs:    encoder         : 
I/flutter (22881): logs:Lavf59.27.100
I/flutter (22881): logs:
I/flutter (22881): logs:  Stream #0:0
I/flutter (22881): logs:: Video: mpeg4 (mp4v / 0x7634706D), yuv420p(tv, progressive), 3024x4032, q=2-31, 200 kb/s
I/flutter (22881): logs:, 
I/flutter (22881): logs:30 fps, 
I/flutter (22881): logs:15360 tbn
I/flutter (22881): logs:
I/flutter (22881): logs:    Metadata:
I/flutter (22881): logs:      encoder         : 
I/flutter (22881): logs:Lavc59.37.100 mpeg4
I/flutter (22881): logs:
I/flutter (22881): logs:    Side data:
I/flutter (22881): logs:      
I/flutter (22881): logs:cpb: 
I/flutter (22881): logs:bitrate max/min/avg: 0/0/200000 buffer size: 0 
I/flutter (22881): logs:vbv_delay: N/A
I/flutter (22881): logs:
I/flutter (22881): logs:      
I/flutter (22881): logs:displaymatrix: rotation of -0.00 degrees
I/flutter (22881): logs:
I/flutter (22881): logs:frame=    1 fps=0.0 q=3.4 size=       0kB time=00:00:00.00 bitrate=5415.4kbits/s speed=32.5x    
I/flutter (22881): logs:frame=    2 fps=0.0 q=2.0 size=       0kB time=00:00:00.03 bitrate=  10.5kbits/s speed=0.0475x    
I/flutter (22881): logs:frame=    9 fps=6.8 q=10.9 size=     256kB time=00:00:00.26 bitrate=7863.7kbits/s dup=5 drop=0 speed=0.202x    
I/flutter (22881): logs:frame=   13 fps=6.6 q=22.7 size=     512kB time=00:00:00.40 bitrate=10484.9kbits/s dup=7 drop=0 speed=0.203x    
I/flutter (22881): logs:frame=   28 fps=8.4 q=31.0 size=     512kB time=00:00:00.90 bitrate=4660.4kbits/s dup=20 drop=0 speed=0.269x    
I/flutter (22881): logs:frame=   55 fps= 11 q=31.0 size=    1024kB time=00:00:01.80 bitrate=4660.4kbits/s dup=45 drop=0 speed=0.368x    
I/flutter (22881): logs:frame=   60 fps=9.8 q=31.0 size=    1280kB time=00:00:01.96 bitrate=5331.7kbits/s dup=49 drop=0 speed=0.321x    
I/flutter (22881): logs:frame=   73 fps=9.4 q=31.0 Lsize=    1500kB time=00:00:02.40 bitrate=5121.4kbits/s dup=61 drop=0 speed=0.309x    
I/flutter (22881): logs:video:1499kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.079011%
I/flutter (22881): logs:frame=   73 fps=9.4 q=31.0 Lsize=N/A time=00:00:02.40 bitrate=N/A dup=61 drop=0 speed=0.309x    
I/flutter (22881): logs:video:1499kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
I/flutter (22881): logs:[android_camera @ 0x7450bb2f80] Android camera capture session was closed.
I/flutter (22881): logs:Exiting normally, received signal 2.
I/flutter (22881): output:ffmpeg version n5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
I/flutter (22881):   built with Android (7155654, based on r399163b1) clang version 11.0.5 (https://android.googlesource.com/toolchain/llvm-project 87f1315dfbea7c137aa2e6d362dbb457e388158d)
I/flutter (22881):   configuration: --cross-prefix=aarch64-linux-android- --sysroot=/files/android-sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/taner/Projects/ffmpeg-kit/prebuilt/android-arm64/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --target-os=android --enable-neon --enable-asm --enable-inline-asm --ar=aarch64-linux-android-ar --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --ranlib=aarch64-linux-android-ranlib --strip=aarch64-linux-android-strip --nm=aarch64-linux-android-nm --extra-libs='-L/home/taner/Projects/ffmpeg-kit/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --disable-autodetect --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-s
I/flutter (22881): failStackTrace:null
I/flutter (22881): result code:255


    


  • Ffmpeg/Fluent-Ffmpeg : Output file #0 does not contain any stream

    16 août 2017, par Code Sherpa

    Use Case

    When a user records an audio file and uploads to firebase storage, run a trigger that crops a clip of that file and saves it to a "preview" directory.

    Problem

    Getting Output file #0 does not contain any stream after static .AAC file is downloaded to temp directory and ffmpeg command is run.

    Environment

    • mac client / firebase storage
    • node v8.1.0
    • ffmpeg v3.2.2
    • fluent-ffmpeg v2.1.2

    Node Code

      var command = new ffmpeg({ source: tempFilePath, timeout: 0 })
    
      .setFfmpegPath(ffmpegPath)
    
      .setFfprobePath(ffprobePath)
    
      .inputOption('-t', '10')
    
      .inputOption('-ss', '10')
    
      .outputOption('-acodec', 'copy')
    
      .on('start', function(commandLine) {
    
            console.log('Spawned Ffmpeg with command: ', commandLine);
    
       })
    
      .on('end', function() {
    
          console.log('Preview file cropping done successfully');
    
       })
    
      .on('error', function(err, stdout, stderr) {
    
          var build = err;
    
          if (!stdout === '') { build = build + '\n' + stdout; }
    
          build = build + '\n' + stderr;
    

    
          console.log(build);
    
       }).save(tempFilePath);

    Ffmpeg Command

    Spawned Ffmpeg with command : ffmpeg -t 10 -ss 10 -i
    /tmp/2EB100B0-6C1E-4D51-9087-764CA653AFC720170711232034.aac -y -acodec
    copy /tmp/2EB100B0-6C1E-4D51-9087-764CA653AFC720170711232034.aac

    Debug Output From Firebase

    Error : ffmpeg exited with code 1 : Output #0, adts, to
    ’/tmp/2EB100B0-6C1E-4D51-9087-764CA653AFC720170711232034.aac’ : Output
    file #0 does not contain any stream

    ffmpeg version 3.2.2-static http://johnvansickle.com/ffmpeg/
    Copyright (c) 2000-2016 the FFmpeg developers built with gcc 5.4.1
    (Debian 5.4.1-4) 20161202 configuration : —enable-gpl
    —enable-version3 —enable-static —disable-debug —disable-ffplay —disable-indev=sndio —disable-outdev=sndio —cc=gcc-5 —enable-fontconfig —enable-frei0r —enable-gnutls —enable-gray —enable-libass —enable-libfreetype —enable-libfribidi —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libvidstab —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxvid —enable-libzimg libavutil 55. 34.100 / 55. 34.100 libavcodec 57. 64.101 / 57. 64.101 libavformat 57. 56.100 / 57. 56.100 libavdevice 57. 1.100 / 57. 1.100 libavfilter 6. 65.100 / 6. 65.100 libswscale 4. 2.100 /
    4. 2.100 libswresample 2. 3.100 / 2. 3.100 libpostproc 54. 1.100 / 54. 1.100 [aac @ 0x3a00e60] Format aac detected only with low score of 1, misdetection possible ! [aac @ 0x3a00e60] Could
    not find codec parameters for stream 0 (Audio : aac, 0 channels, fltp) :
    unspecified sample rate Consider increasing the value for the
    ’analyzeduration’ and ’probesize’ options
    /tmp/2EB100B0-6C1E-4D51-9087-764CA653AFC720170711232034.aac : could not
    seek to position 10.000 Input #0, aac, from
    ’/tmp/2EB100B0-6C1E-4D51-9087-764CA653AFC720170711232034.aac’ :
    Duration : N/A, bitrate : N/A
    Stream #0:0 : Audio : aac, 0 channels, fltp Output #0, adts, to ’/tmp/2EB100B0-6C1E-4D51-9087-764CA653AFC720170711232034.aac’ : Output
    file #0 does not contain any stream

    Console Output

    | $ ffmpeg -t 10 -ss 10 -i 2EB100B0-6C1E-4D51-9087-764CA653AFC720170711232034.aac -y -acodec aac
    output_file.aac

    ffmpeg version 3.2.2 Copyright (c) 2000-2016 the
    FFmpeg developers built 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 —enable-libvidstab —enable-libx265 —disable-doc —arch=x86_64 —enable-runtime-cpudetect libavutil 55. 34.100 / 55. 34.100 libavcodec 57. 64.101 / 57. 64.101 libavformat 57. 56.100 / 57. 56.100 libavdevice 57. 1.100 / 57. 1.100 libavfilter 6. 65.100 / 6. 65.100 libswscale 4. 2.100 /
    4. 2.100 libswresample 2. 3.100 / 2. 3.100 libpostproc 54. 1.100 / 54. 1.100 [aac @ 0x7fac6c800a00] Estimating duration from bitrate, this may be inaccurate Input #0, aac, from
    ’2EB100B0-6C1E-4D51-9087-764CA653AFC720170711232034.aac’ : Duration :
    00:01:07.71, bitrate : 223 kb/s
    Stream #0:0 : Audio : aac (LC), 44100 Hz, stereo, fltp, 277 kb/s Output #0, adts, to ’output_file.aac’ : Metadata :
    encoder : Lavf57.56.100
    Stream #0:0 : Audio : aac (LC), 44100 Hz, stereo, fltp, 128 kb/s
    Metadata :
    encoder : Lavc57.64.101 aac Stream mapping : Stream #0:0 -> #0:0 (aac (native) -> aac (native)) Press [q] to stop, [?] for help size= 159kB time=00:00:10.00 bitrate= 130.5kbits/s
    speed=12.7x video:0kB audio:156kB subtitle:0kB other streams:0kB
    global headers:0kB muxing overhead : 1.887004% [aac @ 0x7fac6d004600]
    Qavg : 383.548

    Origin File Format

    $ ffprobe -show_format
    2EB100B0-6C1E-4D51-9087-764CA653AFC720170711232034.aac

    ffprobe version 3.2.2 Copyright (c) 2007-2016 the FFmpeg developers
    built 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 —enable-libvidstab —enable-libx265 —disable-doc —arch=x86_64 —enable-runtime-cpudetect libavutil 55. 34.100 / 55. 34.100 libavcodec 57. 64.101 / 57. 64.101 libavformat 57. 56.100 / 57. 56.100 libavdevice 57. 1.100 / 57. 1.100 libavfilter 6. 65.100 / 6. 65.100 libswscale 4. 2.100 /
    4. 2.100 libswresample 2. 3.100 / 2. 3.100 libpostproc 54. 1.100 / 54. 1.100 [aac @ 0x7fefbd001400] Estimating duration from bitrate, this may be inaccurate Input #0, aac, from
    ’2EB100B0-6C1E-4D51-9087-764CA653AFC720170711232034.aac’ : Duration :
    00:01:07.71, bitrate : 223 kb/s
    Stream #0:0 : Audio : aac (LC), 44100 Hz, stereo, fltp, 223 kb/s [FORMAT]
    filename=2EB100B0-6C1E-4D51-9087-764CA653AFC720170711232034.aac
    nb_streams=1 nb_programs=0 format_name=aac format_long_name=raw ADTS
    AAC (Advanced Audio Coding) start_time=N/A duration=67.706333
    size=1892392 bit_rate=223599 probe_score=51 [/FORMAT]

    Output File Format

    $ ffprobe -show_format output_file.aac ffprobe version 3.2.2 Copyright
    (c) 2007-2016 the FFmpeg developers built 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 —enable-libvidstab —enable-libx265 —disable-doc —arch=x86_64 —enable-runtime-cpudetect libavutil 55. 34.100 / 55. 34.100 libavcodec 57. 64.101 / 57. 64.101 libavformat 57. 56.100 /
    57. 56.100 libavdevice 57. 1.100 / 57. 1.100 libavfilter 6. 65.100 / 6. 65.100 libswscale 4. 2.100 / 4. 2.100 libswresample 2. 3.100 / 2. 3.100 libpostproc 54. 1.100 /
    54. 1.100 [aac @ 0x7fa904802a00] Estimating duration from bitrate, this may be inaccurate Input #0, aac, from ’output_file.aac’ :
    Duration : 00:00:09.45, bitrate : 138 kb/s
    Stream #0:0 : Audio : aac (LC), 44100 Hz, stereo, fltp, 138 kb/s [FORMAT] filename=output_file.aac nb_streams=1 nb_programs=0
    format_name=aac format_long_name=raw ADTS AAC (Advanced Audio Coding)
    start_time=N/A duration=9.454635 size=163278 bit_rate=138156
    probe_score=51 [/FORMAT]

    Comments & Observations

    • I am able to run the ffmpeg command (provided above) locally and get the results I want.

    • The origin file is AAC. I have verified that it is, indeed, an AAC file and not a different file type masquerading as an AAC.

    • The output file format appears as audio/x-aac in firebase. I would expect it to be the same as the origin file - audio/aac.

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