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• FFMPEG Video to Audio Conversion Results in Different Durations

  10 juin 2020, par Eric J

  I am trying to covert an MP4 file into a mono WAV file sampled at 16,000 Hz.

  



  When I run below code, the duration goes from 00:09:59.99 (MP4) to 00:09:57.64 (WAV). Its original, longer version goes from 00:48:37.46 (MP4) to 00:48:23.38 (WAV).

  



  ffmpeg -i .mp4 -ac 1 -ar 16000 .wav


  



  I've also tried below code. The result is much worse, going from 00:09:59.99 (MP4) to 00:12:56.29 (AAC).

  



  ffmpeg -I .mp4 -vn -acodec copy .aac


  



  Attaching the log :

  



  Report written to "ffmpeg-20200610-093115.log"
Command line:
ffmpeg -i short.mp4 -ac 1 -ar 16000 short.wav -report
ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
Splitting the commandline.
Reading option '-i' ... matched as input url with argument 'short.mp4'.
Reading option '-ac' ... matched as option 'ac' (set number of audio channels) with argument '1'.
Reading option '-ar' ... matched as option 'ar' (set audio sampling rate (in Hz)) with argument '16000'.
Reading option 'short.wav' ... matched as output url.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option report (generate a report) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input url short.mp4.
Successfully parsed a group of options.
Opening an input file: short.mp4.
[NULL @ 0x7f98a3008200] Opening 'short.mp4' for reading
[file @ 0x7f98a2904440] Setting default whitelist 'file,crypto'
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f98a3008200] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f98a3008200] ISO: File Type Major Brand: mp42
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f98a3008200] Unknown dref type 0x206c7275 size 12
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f98a3008200] Processing st: 0, edit list 0 - media time: 0, duration: 7679872
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f98a3008200] Unknown dref type 0x206c7275 size 12
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f98a3008200] Processing st: 1, edit list 0 - media time: 1024, duration: 26459559
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f98a3008200] drop a frame at curr_cts: 0 @ 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f98a3008200] Before avformat_find_stream_info() pos: 11213917 bytes read:318782 seeks:1 nb_streams:2
[h264 @ 0x7f98a3808800] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x7f98a3808800] nal_unit_type: 8(PPS), nal_ref_idc: 3
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f98a3008200] demuxer injecting skip 1024 / discard 0
[aac @ 0x7f98a1008c00] skip 1024 / discard 0 samples due to side data
[h264 @ 0x7f98a3808800] nal_unit_type: 6(SEI), nal_ref_idc: 0
[h264 @ 0x7f98a3808800] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x7f98a3808800] Format yuv420p chosen by get_format().
[h264 @ 0x7f98a3808800] Reinit context to 640x368, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f98a3008200] All info found
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f98a3008200] After avformat_find_stream_info() pos: 21961 bytes read:351550 seeks:2 frames:46
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'short.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 1
    compatible_brands: isommp41mp42
    creation_time   : 2020-06-10T16:12:17.000000Z
  Duration: 00:09:59.99, start: 0.000000, bitrate: 149 kb/s
    Stream #0:0(eng), 1, 1/12800: Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 47 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2020-06-10T16:12:17.000000Z
      handler_name    : Core Media Video
    Stream #0:1(eng), 45, 1/44100: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 98 kb/s (default)
    Metadata:
      creation_time   : 2020-06-10T16:12:17.000000Z
      handler_name    : Core Media Audio
Successfully opened the file.
Parsing a group of options: output url short.wav.
Applying option ac (set number of audio channels) with argument 1.
Applying option ar (set audio sampling rate (in Hz)) with argument 16000.
Successfully parsed a group of options.
Opening an output file: short.wav.
[file @ 0x7f98a0c1db40] Setting default whitelist 'file,crypto'
Successfully opened the file.
Stream mapping:
  Stream #0:1 -> #0:0 (aac (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[aac @ 0x7f98a100de00] skip 1024 / discard 0 samples due to side data
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
detected 12 logical cores
[graph_0_in_0_1 @ 0x7f98a0e2c4c0] Setting 'time_base' to value '1/44100'
[graph_0_in_0_1 @ 0x7f98a0e2c4c0] Setting 'sample_rate' to value '44100'
[graph_0_in_0_1 @ 0x7f98a0e2c4c0] Setting 'sample_fmt' to value 'fltp'
[graph_0_in_0_1 @ 0x7f98a0e2c4c0] Setting 'channel_layout' to value '0x4'
[graph_0_in_0_1 @ 0x7f98a0e2c4c0] tb:1/44100 samplefmt:fltp samplerate:44100 chlayout:0x4
[format_out_0_0 @ 0x7f98a0e2cb80] Setting 'sample_fmts' to value 's16'
[format_out_0_0 @ 0x7f98a0e2cb80] Setting 'sample_rates' to value '16000'
[format_out_0_0 @ 0x7f98a0e2cb80] Setting 'channel_layouts' to value '0x4'
[format_out_0_0 @ 0x7f98a0e2cb80] auto-inserting filter 'auto_resampler_0' between the filter 'Parsed_anull_0' and the filter 'format_out_0_0'
[AVFilterGraph @ 0x7f98a0c16ac0] query_formats: 4 queried, 6 merged, 3 already done, 0 delayed
[auto_resampler_0 @ 0x7f98a0e2d540] [SWR @ 0x7f98a28e1000] Using fltp internally between filters
[auto_resampler_0 @ 0x7f98a0e2d540] ch:1 chl:mono fmt:fltp r:44100Hz -> ch:1 chl:mono fmt:s16 r:16000Hz
Output #0, wav, to 'short.wav':
  Metadata:
    major_brand     : mp42
    minor_version   : 1
    compatible_brands: isommp41mp42
    ISFT            : Lavf58.20.100
    Stream #0:0(eng), 0, 1/16000: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 Hz, mono, s16, 256 kb/s (default)
    Metadata:
      creation_time   : 2020-06-10T16:12:17.000000Z
      handler_name    : Core Media Audio
      encoder         : Lavc58.35.100 pcm_s16le
size=   17152kB time=00:09:16.63 bitrate= 252.4kbits/s speed=1.11e+03x    
[out_0_0 @ 0x7f98a0e2c700] EOF on sink link out_0_0:default.
No more output streams to write to, finishing.
size=   18676kB time=00:09:59.99 bitrate= 255.0kbits/s speed=1.11e+03x    
video:0kB audio:18676kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000408%
Input file #0 (short.mp4):
  Input stream #0:0 (video): 1 packets read (3689 bytes); 
  Input stream #0:1 (audio): 25739 packets read (7375414 bytes); 25738 frames decoded (26355712 samples); 
  Total: 25740 packets (7379103 bytes) demuxed
Output file #0 (short.wav):
  Output stream #0:0 (audio): 25739 frames encoded (9562163 samples); 25739 packets muxed (19124326 bytes); 
  Total: 25739 packets (19124326 bytes) muxed
25738 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0x7f98a0c1dc40] Statistics: 4 seeks, 76 writeouts
[AVIOContext @ 0x7f98a29045c0] Statistics: 10902846 bytes read, 29 seeks


  


• Rotate a h264 video using the Display Orientation SEI

  4 juin 2020, par Tunji_D

  I'm trying to rotate a h264 video 90 degrees anticlockwise. The syntax for the Display Orientation Supplementary EnhancementInformation (SEI) is given as :

  



  

  



  Which I first tried encoding as follows :

  



  val prefix = byteArrayOf(0, 0, 0, 1)
val nalHeader = byteArrayOf(6) // 0 forbidden_zero_bit = 0, nal_ref_idc = 0, nal_unit_type = 6

val display = byteArrayOf(47 /* Display orientation type*/, 3 /*payload size*/)

val displayOrientationCancelFlag = "0" // u(1); Rotation information follows
val horFlip = "0" // hor_flip; u(1); Do not flip horizontally
val verFlip = "0" // ver_flip; u(1); Do not flip vertically
val anticlockwiseRotation = "0100000000000000" // u(16); value / 2^16 -> 90 degrees
val displayOrientationRepetitionPeriod = "010" // ue(v); Persistent till next video sequence
val displayOrientationExtensionFlag = "0" // u(1); No other value is permitted by the spec atm
val byteAlignment = "1"


  



  The above is my kotlin code for generating the SEI. This is a static variable so I went for human readable version.

  



  Dropping the Annex B start codes, the hex SEI is

  



  06 2f 03 08 00 09


  



  ffmpeg complained about this however, saying that my payload size was specified as 3 bytes (24 bits) but it only read 23 bits before reading the NAL stop bit. To fix this I padded my SEI payload by one zero bit to allow ffmpeg parse it successfully, and added the stop bit again with more byte alignment bits :

  



  val byteAlignment = "010000000"


  



  This in hex is

  



  06 2f 03 08 00 08 80


  



  When I add this before the first IDR NAL unit in my h264 rbsp, ffmpeg will accept it to convert to whatever format I ask, jpeg or mp4. The output is not rotated however. Playing it with ffplay also does not rotate it. I'm note quite sure what I'm doing wrong. ffprobe yields the following output :

  



  [NULL @ 0x7fca03808a00] Opening 'sei2.264' for reading
[file @ 0x7fca01c289c0] Setting default whitelist 'file,crypto'
Probing h264 score:51 size:1502
Probing mp3 score:1 size:1502
[h264 @ 0x7fca03808a00] Format h264 probed with size=2048 and score=51
[h264 @ 0x7fca03808a00] Before avformat_find_stream_info() pos: 0 bytes read:1502 seeks:0 nb_streams:1
[AVBSFContext @ 0x7fca02808680] nal_unit_type: 7(SPS), nal_ref_idc: 3
[AVBSFContext @ 0x7fca02808680] nal_unit_type: 8(PPS), nal_ref_idc: 3
[AVBSFContext @ 0x7fca02808680] nal_unit_type: 6(SEI), nal_ref_idc: 0
[AVBSFContext @ 0x7fca02808680] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x7fca0381d400] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x7fca0381d400] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x7fca0381d400] nal_unit_type: 6(SEI), nal_ref_idc: 0
[h264 @ 0x7fca0381d400] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x7fca0381d400] Format yuv420p chosen by get_format().
[h264 @ 0x7fca0381d400] Reinit context to 176x144, pix_fmt: yuv420p
[h264 @ 0x7fca03808a00] decoding for stream 0 failed
[h264 @ 0x7fca03808a00] stream 0: start_time: -7686143364045.646 duration: -7686143364045.646
[h264 @ 0x7fca03808a00] format: start_time: -9223372036854.775 duration: -9223372036854.775 bitrate=0 kb/s
[h264 @ 0x7fca03808a00] After avformat_find_stream_info() pos: 1502 bytes read:1502 seeks:0 frames:1
Input #0, h264, from 'sei2.264':
  Duration: N/A, bitrate: N/A
    Stream #0:0, 1, 1/1200000: Video: h264 (Constrained Baseline), 1 reference frame, yuv420p(progressive, left), 176x144, 0/1, 25 tbr, 1200k tbn, 50 tbc
[h264 @ 0x7fca0380dc00] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x7fca0380dc00] nal_unit_type: 8(PPS), nal_ref_idc: 3
[AVIOContext @ 0x7fca02801b00] Statistics: 1502 bytes read, 0 seeks


  



  My full RBSP with SPS, PPS, SEI and IDR follow :

  



  unsigned char rbsp[1502] = {
    // Offset 0x00000000 to 0x00001501
    0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0xc0, 0x29, 0x8d, 0x68, 0x2c, 0x4e,
    0x80, 0x78, 0x44, 0x23, 0x50, 0x00, 0x00, 0x00, 0x01, 0x68, 0xce, 0x01,
    0xa8, 0x35, 0xc8, 0x00, 0x00, 0x00, 0x01, 0x06, 0x2f, 0x03, 0x08, 0x00,
    0x08, 0x80, 0x00, 0x00, 0x00, 0x01, 0x65, 0xb8, 0x00, 0x04, 0x05, 0x9f,
    0xff, 0xff, 0x04, 0x51, 0x40, 0x00, 0x41, 0x63, 0xc7, 0x31, 0xcf, 0xff,
    0xff, 0x27, 0xff, 0xfe, 0x4f, 0xff, 0xfc, 0x9f, 0xff, 0xf9, 0x3f, 0xff,
    0xf2, 0x7f, 0xff, 0xe4, 0xff, 0xff, 0xc9, 0xff, 0xff, 0x93, 0xff, 0xff,
    0x27, 0xff, 0xfe, 0x4f, 0xff, 0xfc, 0x9f, 0xff, 0xf9, 0x3f, 0xff, 0xf2,
    0x7f, 0xff, 0xe4, 0xff, 0xfc, 0x43, 0x05, 0xd0, 0x03, 0x2b, 0x2d, 0x11,
    0x03, 0x16, 0x84, 0xb4, 0x5e, 0xc2, 0x00, 0x03, 0xa0, 0x20, 0xc7, 0x42,
    0xb6, 0xb8, 0x00, 0x57, 0x66, 0x66, 0x09, 0xdc, 0xc1, 0x92, 0x50, 0x86,
    0x38, 0x04, 0x8f, 0x6d, 0x83, 0xff, 0xff, 0x41, 0x5e, 0xef, 0xbb, 0xff,
    0xff, 0xd0, 0x57, 0xbb, 0xee, 0xff, 0xff, 0xf4, 0x15, 0xee, 0xfb, 0xbf,
    0xff, 0xfd, 0x05, 0x7b, 0xbe, 0xef, 0xff, 0xff, 0x41, 0x5e, 0xef, 0xbb,
    0xff, 0xff, 0xd0, 0x57, 0xbb, 0xc0, 0x25, 0x55, 0x9a, 0xdf, 0x9f, 0x22,
    0x63, 0xff, 0xff, 0x27, 0xff, 0xfe, 0x4f, 0xff, 0xfc, 0x9f, 0xff, 0xf9,
    0x3f, 0xff, 0xec, 0x86, 0xfc, 0x7d, 0x2d, 0x2f, 0xf8, 0x07, 0xfa, 0xf8,
    0x00, 0x37, 0x66, 0x35, 0x11, 0x29, 0x61, 0x8b, 0x30, 0x53, 0x41, 0x3c,
    0xb3, 0xee, 0x59, 0xa7, 0xb7, 0xc2, 0x00, 0x03, 0x00, 0x07, 0x05, 0x86,
    0x02, 0x10, 0x88, 0x38, 0x00, 0x53, 0x68, 0x93, 0x1b, 0xf4, 0x22, 0x3b,
    0x90, 0x00, 0x08, 0x30, 0xd9, 0x64, 0x00, 0x02, 0x0c, 0x36, 0xe6, 0x10,
    0xef, 0xa0, 0xf6, 0x52, 0xc3, 0xd9, 0x5c, 0xf8, 0x1f, 0xff, 0xb0, 0xdf,
    0x80, 0x06, 0xc6, 0xaa, 0x46, 0x19, 0xd8, 0x55, 0x96, 0x5f, 0xfb, 0x38,
    0xc2, 0xf8, 0x40, 0x00, 0x64, 0x0a, 0x0a, 0x30, 0x11, 0x20, 0xd4, 0x00,
    0x8c, 0x99, 0xb0, 0x6c, 0xd9, 0x4a, 0x10, 0xde, 0x0c, 0x80, 0x00, 0x83,
    0x8c, 0xb9, 0x88, 0xed, 0x77, 0x3c, 0x85, 0x1d, 0xcd, 0x2f, 0xff, 0xc7,
    0x9c, 0x3b, 0xc0, 0xe8, 0x22, 0xb2, 0xbe, 0x04, 0xdf, 0xdf, 0xfe, 0x42,
    0x80, 0x0b, 0x83, 0x88, 0xa5, 0x81, 0xc0, 0x02, 0x05, 0x08, 0x96, 0x00,
    0x43, 0x64, 0x44, 0x09, 0xdf, 0xa1, 0x03, 0x88, 0xbe, 0x0d, 0x9c, 0xb1,
    0x23, 0x3a, 0xe7, 0xff, 0xfd, 0x93, 0xff, 0xff, 0x27, 0xe2, 0x1f, 0xf8,
    0x2c, 0x80, 0xf2, 0x10, 0xf2, 0xdf, 0x08, 0x00, 0x44, 0x00, 0x18, 0x0e,
    0x81, 0x20, 0x02, 0x24, 0x0e, 0x00, 0x10, 0x20, 0x44, 0xbf, 0x06, 0xa7,
    0x2f, 0xfc, 0xbf, 0x0c, 0x01, 0x02, 0xf8, 0xc4, 0xcf, 0x07, 0xc0, 0xe0,
    0x00, 0x80, 0x08, 0x0f, 0x65, 0x84, 0x04, 0x0a, 0x8a, 0x03, 0x83, 0x44,
    0xc0, 0x02, 0x92, 0x22, 0x20, 0x6c, 0xd9, 0x08, 0x1c, 0xfe, 0x03, 0x80,
    0x8c, 0x5c, 0xb2, 0x00, 0x46, 0x2e, 0x5e, 0x04, 0x6c, 0xbb, 0x80, 0x71,
    0x08, 0xf2, 0xc8, 0x10, 0x8f, 0x2c, 0x5a, 0xf2, 0x74, 0x0d, 0xb7, 0xf8,
    0xd3, 0xed, 0x6d, 0x7f, 0xfc, 0x38, 0x03, 0x0e, 0xf8, 0x00, 0xee, 0x12,
    0x89, 0xef, 0x22, 0x09, 0x97, 0xd3, 0xdf, 0x30, 0xc1, 0x48, 0x01, 0x80,
    0x06, 0x9b, 0x80, 0x05, 0x64, 0xcd, 0x98, 0x9b, 0x29, 0x48, 0x74, 0x22,
    0x32, 0x4b, 0xe0, 0x0f, 0x06, 0xd8, 0x61, 0x77, 0xb8, 0x70, 0x11, 0x8b,
    0x97, 0xff, 0xc1, 0x30, 0x06, 0x1d, 0xf0, 0x00, 0xdc, 0xa1, 0x16, 0x88,
    0xd5, 0xcc, 0x49, 0x17, 0xd9, 0xe8, 0x36, 0x61, 0x05, 0x55, 0x80, 0xe0,
    0x0c, 0x37, 0x00, 0x21, 0xb4, 0x4a, 0x1b, 0xf4, 0x25, 0x8a, 0x40, 0x08,
    0xc5, 0xcb, 0xe0, 0x70, 0x64, 0xa2, 0x13, 0xbd, 0xc3, 0x88, 0x47, 0x97,
    0xf9, 0xf8, 0x07, 0xb0, 0x5f, 0x8e, 0xcc, 0xe0, 0xf8, 0x00, 0xac, 0x2f,
    0x8e, 0xe6, 0x11, 0x2f, 0x51, 0xea, 0xf0, 0x40, 0xbb, 0x30, 0x4b, 0x4b,
    0x0e, 0x02, 0x31, 0x72, 0xfc, 0x38, 0x84, 0x79, 0x7f, 0xe1, 0xff, 0xb0,
    0x59, 0xea, 0xcf, 0xdc, 0x66, 0x12, 0xc3, 0xd5, 0xf2, 0xbd, 0x3c, 0x76,
    0x02, 0x47, 0xae, 0x3d, 0xff, 0xf0, 0x24, 0x5c, 0xb3, 0xd2, 0x26, 0x2b,
    0x9f, 0xf1, 0xfe, 0xc1, 0x6c, 0xf4, 0x1e, 0xe1, 0x00, 0x00, 0x80, 0x30,
    0x03, 0x07, 0x97, 0x08, 0x4c, 0x85, 0x81, 0xc0, 0x02, 0x04, 0x08, 0x97,
    0xe0, 0xd4, 0xe5, 0xff, 0xff, 0xf6, 0x16, 0xdb, 0xee, 0xfd, 0x1f, 0x6b,
    0x6b, 0x6b, 0x6b, 0x6b, 0xc3, 0xff, 0xf6, 0x08, 0xbe, 0x0b, 0x44, 0xaf,
    0xf9, 0xff, 0xb0, 0x59, 0xe0, 0x0d, 0x5f, 0x6a, 0x38, 0xde, 0x82, 0x01,
    0x20, 0xc4, 0x80, 0x78, 0x00, 0x56, 0x46, 0x66, 0x84, 0xd9, 0x4a, 0xac,
    0xd2, 0x00, 0x02, 0x05, 0x08, 0xb9, 0x04, 0xdf, 0xf6, 0x95, 0x9d, 0xce,
    0x01, 0x82, 0xfc, 0x34, 0x3b, 0xee, 0x47, 0xc0, 0x4f, 0xaf, 0xad, 0x6f,
    0x5e, 0x10, 0x17, 0x1d, 0x82, 0xc6, 0x35, 0xa0, 0x01, 0x4d, 0x91, 0x13,
    0x1b, 0xf4, 0x26, 0x57, 0xc8, 0x00, 0x04, 0x08, 0x13, 0x71, 0xc6, 0x81,
    0x23, 0x5b, 0xd6, 0x51, 0x2b, 0x9f, 0xff, 0xf6, 0x1f, 0xef, 0x3b, 0xcf,
    0x53, 0xd7, 0x5d, 0x75, 0xd7, 0x4f, 0xff, 0xff, 0xc1, 0x07, 0x01, 0xc0,
    0x21, 0xce, 0x2e, 0x5b, 0xff, 0xff, 0xb0, 0x43, 0xe0, 0x03, 0x6d, 0x10,
    0xe1, 0x0a, 0x27, 0xa4, 0xdd, 0xa1, 0xce, 0x03, 0xda, 0x72, 0xdf, 0xfe,
    0x29, 0x6a, 0xa5, 0xea, 0xa5, 0x80, 0x06, 0x0b, 0x68, 0x8a, 0x66, 0x62,
    0xdf, 0xfc, 0x7e, 0xc1, 0x07, 0x01, 0xe6, 0x3a, 0x88, 0x7f, 0xd0, 0xe8,
    0x00, 0xfc, 0x02, 0x67, 0xb1, 0xe0, 0x73, 0xd2, 0x2e, 0x03, 0xf8, 0x00,
    0xc4, 0x00, 0x6f, 0x9b, 0x15, 0x6b, 0x2d, 0xcf, 0x07, 0xc0, 0x02, 0x09,
    0x6a, 0x32, 0xd8, 0xba, 0x3f, 0x0c, 0x28, 0x20, 0x28, 0x20, 0x20, 0x42,
    0x00, 0x83, 0xe0, 0x70, 0x23, 0x15, 0x2c, 0x01, 0x03, 0x2a, 0x63, 0xcc,
    0x42, 0x99, 0x02, 0x19, 0xee, 0x01, 0xc8, 0x46, 0x96, 0x00, 0x47, 0x6c,
    0xd8, 0x04, 0xaa, 0x41, 0xbc, 0x41, 0x05, 0x32, 0x00, 0x08, 0x20, 0xab,
    0x9f, 0xff, 0xf4, 0x0a, 0xb4, 0xab, 0x8d, 0x3e, 0x09, 0x25, 0xff, 0xff,
    0xe8, 0x9f, 0xff, 0xf4, 0x4f, 0xff, 0xfa, 0x27, 0xff, 0xfd, 0x07, 0x30,
    0x04, 0x2d, 0x20, 0x47, 0x38, 0x95, 0xab, 0xfc, 0x00, 0x6b, 0x19, 0x05,
    0xce, 0x53, 0x10, 0xa6, 0xed, 0x08, 0x12, 0xc0, 0x90, 0x00, 0x26, 0x1a,
    0x00, 0x21, 0xfb, 0x90, 0xfc, 0x84, 0x24, 0x10, 0xcd, 0x72, 0x00, 0x14,
    0xd2, 0x35, 0x91, 0x86, 0x37, 0x5e, 0x9b, 0x20, 0x00, 0x41, 0x05, 0xdc,
    0xff, 0xe0, 0x18, 0x57, 0xe0, 0x02, 0x98, 0xf7, 0x33, 0x98, 0x55, 0x3d,
    0x47, 0xab, 0xdf, 0xe8, 0x30, 0x01, 0xab, 0x58, 0x48, 0x53, 0xb1, 0x8a,
    0x7a, 0xbd, 0xd5, 0x8f, 0x87, 0xe0, 0x01, 0x0c, 0xa4, 0x12, 0xad, 0xcc,
    0x29, 0x1a, 0xd0, 0x83, 0xd9, 0xc2, 0x9a, 0xf4, 0xd0, 0x38, 0x08, 0xa4,
    0xcb, 0xf2, 0xfc, 0xb0, 0xe0, 0x9c, 0x79, 0x7f, 0xff, 0xfe, 0x10, 0x61,
    0xef, 0xc0, 0x01, 0x93, 0x46, 0x83, 0x76, 0xea, 0x41, 0x8d, 0xf7, 0x4b,
    0x14, 0x1c, 0x00, 0x04, 0x10, 0x20, 0x18, 0x00, 0x08, 0x14, 0xf0, 0x91,
    0xcd, 0xb8, 0x08, 0xd4, 0xb7, 0xcf, 0x7f, 0xff, 0xd0, 0x43, 0xdf, 0xd0,
    0x81, 0x83, 0xca, 0xc0, 0x05, 0x34, 0x63, 0x27, 0x15, 0x4d, 0x52, 0x0d,
    0xda, 0x5e, 0x30, 0x5e, 0x05, 0x2a, 0x0d, 0xbb, 0x90, 0x22, 0x03, 0x7a,
    0x68, 0x1d, 0x21, 0xdc, 0xd4, 0xc8, 0x91, 0x4d, 0xf3, 0xcf, 0xff, 0xfa,
    0x05, 0x9c, 0x53, 0xfa, 0x45, 0xff, 0xe3, 0x4f, 0xff, 0xfe, 0x82, 0xdb,
    0x7d, 0xdf, 0x1c, 0x00, 0x0d, 0xc7, 0x00, 0x01, 0x01, 0x5f, 0xff, 0xfd,
    0x06, 0xae, 0xf9, 0x7d, 0x31, 0xf1, 0x08, 0xe2, 0x00, 0x00, 0x80, 0x30,
    0x03, 0xea, 0x2e, 0x30, 0x92, 0x6b, 0xc8, 0x70, 0x98, 0x6b, 0x90, 0xe1,
    0x30, 0xd7, 0x3f, 0xf0, 0xc0, 0x34, 0x0b, 0x60, 0x00, 0x99, 0x90, 0xc8,
    0xe1, 0x98, 0xdc, 0x41, 0x23, 0xcc, 0x71, 0xf0, 0x40, 0xc6, 0x17, 0xc2,
    0x80, 0x07, 0xc0, 0x81, 0x40, 0x00, 0xf8, 0x09, 0xc0, 0x27, 0xb1, 0x37,
    0x72, 0x02, 0xa7, 0xd5, 0xe2, 0xc0, 0x80, 0xa6, 0x78, 0x04, 0xe9, 0x89,
    0x95, 0xc8, 0x0e, 0xbf, 0x57, 0x8b, 0x00, 0x80, 0x53, 0x3f, 0xf5, 0xf0,
    0xd8, 0x76, 0x00, 0x09, 0xe4, 0x38, 0xcc, 0x7e, 0x90, 0x66, 0x90, 0xb5,
    0x86, 0x08, 0x50, 0x00, 0x6c, 0x99, 0xb4, 0x44, 0x8c, 0x6a, 0x89, 0xc4,
    0xf8, 0x27, 0xf8, 0x41, 0x1f, 0xdc, 0x10, 0x47, 0xf7, 0x60, 0x04, 0x9d,
    0x0f, 0x31, 0x5c, 0x9e, 0xaf, 0x0e, 0x09, 0x89, 0x81, 0x0d, 0x34, 0xdb,
    0x56, 0x00, 0x48, 0xd4, 0x34, 0x62, 0xb9, 0xbd, 0x5e, 0x1c, 0x05, 0xd9,
    0x81, 0x0d, 0x34, 0xdb, 0x57, 0xfc, 0x03, 0x0e, 0x81, 0x54, 0x20, 0x04,
    0x86, 0x28, 0x40, 0x09, 0x0c, 0x5f, 0xc0, 0x15, 0x24, 0x63, 0x05, 0x38,
    0xc3, 0x6d, 0x5f, 0x58, 0x02, 0xa1, 0x67, 0x70, 0x53, 0x0c, 0x36, 0xd5,
    0xff, 0xf0, 0x0d, 0x87, 0x70, 0x00, 0x4c, 0xc8, 0x64, 0x70, 0xcc, 0x6e,
    0x20, 0x91, 0xe6, 0x38, 0xfc, 0x61, 0x70, 0x40, 0xfc, 0x20, 0x08, 0x75,
    0x94, 0x10, 0x04, 0x15, 0x66, 0x61, 0x35, 0xc3, 0xec, 0x47, 0x2f, 0xab,
    0xc5, 0x81, 0x01, 0x4c, 0xe1, 0x32, 0x70, 0xd5, 0x88, 0xe7, 0xf5, 0x78,
    0xb0, 0x08, 0x05, 0x33, 0xff, 0x05, 0xfd, 0x82, 0xff, 0xaf, 0x80, 0x02,
    0x79, 0x0e, 0x33, 0x1f, 0xa4, 0x19, 0xa4, 0x2d, 0x70, 0x42, 0x08, 0x01,
    0x3c, 0x06, 0x08, 0x01, 0x38, 0x25, 0x43, 0x82, 0x61, 0x6e, 0x00, 0x12,
    0xf0, 0x9b, 0x39, 0x41, 0x51, 0xea, 0xf1, 0x00, 0x98, 0x5b, 0x90, 0xe4,
    0x64, 0xb8, 0x00, 0x4a, 0xd0, 0x99, 0x1c, 0xa0, 0x55, 0x7a, 0xbc, 0x41,
    0x19, 0x2e, 0x7f, 0xff, 0xd0, 0x63, 0x2e, 0xa6, 0x3c, 0x00, 0x19, 0xb4,
    0x49, 0x8d, 0xfa, 0x11, 0x1d, 0xd2, 0x33, 0xe8, 0xef, 0xff, 0xfe, 0xfc,
    0x07, 0x00, 0x10, 0x41, 0xaa, 0x4b, 0x7e, 0x00, 0x0d, 0xd3, 0x26, 0xc4,
    0xf3, 0x15, 0x1d, 0x13, 0x9f, 0x04, 0x2c, 0x0e, 0x00, 0xc1, 0x02, 0x40,
    0x07, 0x81, 0xb4, 0x70, 0x75, 0x43, 0xf0, 0x3c, 0xc5, 0x70, 0x8f, 0xff,
    0xff, 0xb0, 0xc7, 0x80, 0x03, 0x36, 0x89, 0x31, 0xbf, 0xc4, 0x47, 0x7d,
    0x04, 0xfb, 0xf8, 0x07, 0xff, 0xb0, 0x45, 0xcb, 0x9e, 0xc2, 0x05, 0xd9,
    0x82, 0x00, 0x11, 0x58, 0xaf, 0xff, 0xfb, 0x08, 0xdf, 0xff, 0xff, 0x61,
    0x1b, 0x7f, 0xff, 0xec, 0x15, 0x76, 0xff, 0xff, 0xdd, 0xff, 0xff, 0xec,
    0x15, 0x44, 0x7b, 0xff, 0xcd, 0x7f, 0xff, 0xec, 0x23, 0x77, 0xff, 0xfe,
    0xc8, 0x9f
}


  


• Audio object type 3 is not supported

  3 octobre 2013, par Ardoramor

  I am running into an issue with a custom-built ffmpeg. Basically, its a vanilla ffmpeg with x264 and fdk-aac libs enabled. I am feeding an SDP file through ffmpeg API and get the following error while passing the info to avcodec_open2 :

  Audio object type 3 is not supported

  My SDP file :

  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=Unnamed
  
  i=N/A
  
  c=IN IP4 192.168.1.1
  
  t=0 0
  
  a=recvonly
  
  m=audio 8204 RTP/AVP 96
  
  a=rtpmap:96 mpeg4-generic/32000
  
  a=fmtp:96 streamtype=5; profile-level-id=15; mode=AAC-hbr; config=1a88; SizeLength=13; IndexLength=3; IndexDeltaLength=3;
  
  a=control:trackID=0
  
  m=video 8202 RTP/AVP 96
  
  a=rtpmap:96 H264/90000
  
  a=fmtp:96 packetization-mode=1;profile-level-id=428028;sprop-parameter-sets=Z0KAKJWgKA9E,aM48gA==;
  
  a=control:trackID=1
  
  m=application 8206 RTP/AVP 96
  
  a=rtpmap:96 smpte336m/10
  
  a=control:trackID=2

  The following is the output I get from ffmpeg as I open the input, dump its format, and try to open input streams :

  Format sdp probed with size=2048 and score=50
  audio codec set to : aac
  audio samplerate set to : 32000
  audio channels set to : 1
  video codec set to : h264
  RTP Packetization Mode : 1
  RTP Profile IDC : 42 Profile IOP : 80 Level : 28
  Extradata set to 0xc8d3dc0 (size : 21) !
  File position before avformat_find_stream_info() is 522
  Audio object type 3 is not supported.
  Could not find codec parameters for stream 1 (Video : h264) : unspecified size
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  File position after avformat_find_stream_info() is 522
  Dumping input AV format
  Input #0, sdp, from 'conf/test.sdp' :

  Metadata :
  title :Unnamed
  comment :N/A

  Duration:N/A, bitrate:N/A

  Stream #0:0, 0, 1/32000: Audio: aac, 32000 Hz, 1 channels, fltp  
  
  
  
  Stream #0:1, 0, 1/90000: Video: h264, 90k tbr, 90k tbn, 180k tbc  
  
  
  
  Stream #0:2, 0, 1/90000: Data: none, 0/1  

  Audio object type 3 is not supported.

  I also see the error reported for not finding codec parameters for stream 1 :

  Could not find codec parameters for stream 1 (Video : h264) : unspecified size
  Consider increasing the value for the 'analyzeduration' and 'probesize' options

  However, I think that is due to me not running an actual rtp at the moment of the test.

  In any case, what may be the reason for getting audio object type 3 not supported exception ?

  UPDATE - Oct 02, 2013

  Static ffmpeg build gives the following flags :

  Static ffmpeg 2.0.1 build flag output :

  ffmpeg version 2.0.1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Sep 30 2013 22:24:00 with gcc 4.1.2 (GCC) 20080704 (Red Hat 4.1.2-54)
  
    configuration: --enable-gpl --enable-nonfree --enable-shared
  
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --enable-runtime-cpudetect --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-avfilter --enable-pthreads --enable-x11grab --enable-vdpau --disable-avisynth --enable-libdc1394 --enable-libfaac --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libx264 --enable-libxavs --enable-libxvid --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --disable-stripping

  My build is from ffmpeg 2.0.1 snapshot with the following flags :

  --enable-static --disable-shared --enable-gpl --enable-nonfree --enable-libfdk-aac --enable-libfaac --enable-libmp3lame --enable-libx264 --disable-symver --disable-doc --disable-ffplay --enable-ffmpeg --disable-ffprobe --disable-ffserver --disable-avdevice --disable-avfilter --disable-filters --disable-devices --disable-everything --enable-avformat --enable-avcodec --enable-muxers --enable-protocols --enable-parsers --enable-demuxers --enable-decoders --enable-encoders --enable-bsfs --enable-network --enable-swscale  --disable-demuxer=sbg --disable-demuxer=dts --disable-parser=dca --disable-decoder=dca --enable-asm --enable-pthreads --enable-version3

  The fdk-aac library version I'm using :

  fdk-aac - 0.1.2

  So it seems that the same .sdp file causes Audio object type 3 error with my build but not with static but I really do not see what causes it (granted I am not an expert with ffmpeg API and may simply miss important details).

  Simplified code for opening .sdp file that doesn't include error checks and logic separation :

  AVFormatContext *inputContext = NULL;
  
  
  
  av_register_all();
  
  avformat_network_init();
  
  
  
  avformat_open_input(&inputContext, "test.sdp", NULL, NULL);
  
  avformat_find_stream_info(inputContext, NULL);
  
  
  
  int inAudioStreamIdx = av_find_best_stream(inputContext, AVMEDIA_TYPE_AUDIO, -1, -1, NULL, 0);
  
  AVStream *st = inputContext->streams[inAudioStreamIdx];
  
  
  
  AVCodecContext *dec_ctx = st->codec;
  
  AVCodec *dec = avcodec_find_decoder(dec_ctx->codec_id);
  
  
  
  avcodec_open2(dec_ctx, dec, NULL); // Fails here with Audio object type 3

  Am I opening the sdp input improperly ?