[FFmpeg-trac] #7846(undetermined:new): AAC -f lavfi or -filter_complex aevalsrc exceed the specified time

FFmpeg trac at avcodec.org
Tue Apr 16 23:07:38 EEST 2019


#7846: AAC -f lavfi or -filter_complex aevalsrc exceed the specified time
-------------------------------------+-------------------------------------
             Reporter:  vsc55        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:  aac lavfi    |               Blocked By:
  filter_complex                     |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: When generating a silence with "-f lavfi -t 5" or with
 "-filter_complex" aevalsrc = 0: d = 5 "" of 5 seconds it generates a
 silence of 10 seconds, this happens with the encoding of AAC, if you
 generate a AC3 or WAV is generated correctly.
 Also, if you try to concatenate a silence with an audio file, add a few
 seconds between both audios.
 How to reproduce:
 {{{
 ffmpeg started on 2019-04-16 at 21:01:32
 Report written to "ffmpeg-20190416-210132.log"
 Command line:
 ".\\ffmpeg.exe" -report -f lavfi -t 5 -v 9 -loglevel 99 -i anullsrc
 silence.aac
 ffmpeg version N-93580-g036b4b0f85 Copyright (c) 2000-2019 the FFmpeg
 developers
   built with gcc 8.3.1 (GCC) 20190414
   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-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-libvorbis --enable-libvo-amrwbenc --enable-libmysofa
 --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx
 --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-
 nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
   libavutil      56. 26.100 / 56. 26.100
   libavcodec     58. 51.100 / 58. 51.100
   libavformat    58. 27.102 / 58. 27.102
   libavdevice    58.  7.100 / 58.  7.100
   libavfilter     7. 48.100 /  7. 48.100
   libswscale      5.  4.100 /  5.  4.100
   libswresample   3.  4.100 /  3.  4.100
   libpostproc    55.  4.100 / 55.  4.100
 Splitting the commandline.
 Reading option '-report' ... matched as option 'report' (generate a
 report) with argument '1'.
 Reading option '-f' ... matched as option 'f' (force format) with argument
 'lavfi'.
 Reading option '-t' ... matched as option 't' (record or transcode
 "duration" seconds of audio/video) with argument '5'.
 Reading option '-v' ... matched as option 'v' (set logging level) with
 argument '9'.
 Reading option '-loglevel' ... matched as option 'loglevel' (set logging
 level) with argument '99'.
 Reading option '-i' ... matched as input url with argument 'anullsrc'.
 Reading option 'silence.aac' ... matched as output url.
 Finished splitting the commandline.
 Parsing a group of options: global .
 Applying option report (generate a report) with argument 1.
 Applying option v (set logging level) with argument 9.
 Applying option loglevel (set logging level) with argument 99.
 Successfully parsed a group of options.
 Parsing a group of options: input url anullsrc.
 Applying option f (force format) with argument lavfi.
 Applying option t (record or transcode "duration" seconds of audio/video)
 with argument 5.
 Successfully parsed a group of options.
 Opening an input file: anullsrc.
 detected 8 logical cores
 [AVFilterGraph @ 000002590e83ca40] query_formats: 2 queried, 3 merged, 0
 already done, 0 delayed
 [Parsed_anullsrc_0 @ 000002590e83ce40] sample_rate:44100
 channel_layout:'stereo' nb_samples:1024
 [lavfi @ 000002590e83b580] All info found
 Input #0, lavfi, from 'anullsrc':
   Duration: N/A, start: 0.000000, bitrate: 705 kb/s
     Stream #0:0, 1, 1/44100: Audio: pcm_u8, 44100 Hz, stereo, u8, 705 kb/s
 Successfully opened the file.
 Parsing a group of options: output url silence.aac.
 Successfully parsed a group of options.
 Opening an output file: silence.aac.
 [file @ 000002590e8cf180] Setting default whitelist 'file,crypto'
 Successfully opened the file.
 Stream mapping:
   Stream #0:0 -> #0:0 (pcm_u8 (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)
 [graph_0_in_0_0 @ 000002590ec90f80] Setting 'time_base' to value '1/44100'
 [graph_0_in_0_0 @ 000002590ec90f80] Setting 'sample_rate' to value '44100'
 [graph_0_in_0_0 @ 000002590ec90f80] Setting 'sample_fmt' to value 'u8'
 [graph_0_in_0_0 @ 000002590ec90f80] Setting 'channel_layout' to value
 '0x3'
 [graph_0_in_0_0 @ 000002590ec90f80] tb:1/44100 samplefmt:u8
 samplerate:44100 chlayout:0x3
 [format_out_0_0 @ 000002590e8d3d80] Setting 'sample_fmts' to value 'fltp'
 [format_out_0_0 @ 000002590e8d3d80] Setting 'sample_rates' to value
 '96000|88200|64000|48000|44100|32000|24000|22050|16000|12000|11025|8000|7350'
 [format_out_0_0 @ 000002590e8d3d80] auto-inserting filter
 'auto_resampler_0' between the filter 'Parsed_anull_0' and the filter
 'format_out_0_0'
 [AVFilterGraph @ 000002590e8cfe80] query_formats: 5 queried, 9 merged, 3
 already done, 0 delayed
 [auto_resampler_0 @ 000002590e8d4340] [SWR @ 000002590e8d5840] Using s16p
 internally between filters
 [auto_resampler_0 @ 000002590e8d4340] ch:2 chl:stereo fmt:u8 r:44100Hz ->
 ch:2 chl:stereo fmt:fltp r:44100Hz
 Output #0, adts, to 'silence.aac':
   Metadata:
     encoder         : Lavf58.27.102
     Stream #0:0, 0, 1/44100: Audio: aac (LC), 44100 Hz, stereo, fltp,
 delay 1024, 128 kb/s
     Metadata:
       encoder         : Lavc58.51.100 aac
 cur_dts is invalid (this is harmless if it occurs once at the start per
 stream)
 [out_0_0 @ 000002590e8d3bc0] EOF on sink link out_0_0:default.
 No more output streams to write to, finishing.
 [aac @ 000002590e843cc0] Trying to remove 684 more samples than there are
 in the queue
 size=       3kB time=00:00:05.01 bitrate=   4.5kbits/s speed=100x
 video:0kB audio:1kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 115.163002%
 Input file #0 (anullsrc):
   Input stream #0:0 (audio): 217 packets read (444416 bytes); 217 frames
 decoded (222208 samples);
   Total: 217 packets (444416 bytes) demuxed
 Output file #0 (silence.aac):
   Output stream #0:0 (audio): 216 frames encoded (220500 samples); 217
 packets muxed (1319 bytes);
   Total: 217 packets (1319 bytes) muxed
 217 frames successfully decoded, 0 decoding errors
 [AVIOContext @ 000002590e8cf240] Statistics: 0 seeks, 1 writeouts
 [aac @ 000002590e843cc0] Qavg: 65536.000
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7846>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker


More information about the FFmpeg-trac mailing list