Transcoding file to aac results in process stuck

[Luca Carlon]

Summary of the bug:
The ffmpeg transcoding procedure results stuck when trying to transcode a mjpeg/pcm_s16le file to h264/aac. This is what I see after many hours of transcoding:

host-001:No backup luca$ ffmpeg -i DSCN0468.AVI -vcodec libx264 -vprofile high -preset veryslow -crf 22 -acodec aac -strict -2 DSCN0468_transcoded_mac.mp4 -threads 0
ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
  built on May 20 2013 05:41:01 with Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
  configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libfreetype --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  libavutil      52. 18.100 / 52. 18.100
  libavcodec     54. 92.100 / 54. 92.100
  libavformat    54. 63.104 / 54. 63.104
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 42.103 /  3. 42.103
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
Trailing options were found on the commandline.
[avi @ 0x7fc281029c00] non-interleaved AVI
Guessed Channel Layout for  Input Stream #0.1 : mono
Input #0, avi, from 'DSCN0468.AVI':
  Metadata:
    encoder         : 
    maker           : NIKON
    model           : COOLPIX S5100
    creation_time   : 2012-04-14 15:58:41
  Duration: 00:22:46.26, start: 0.000000, bitrate: 22618 kb/s
    Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p, 1280x720, 29.97 tbr, 29.97 tbn, 29.97 tbc
    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono, s16, 352 kb/s
File 'DSCN0468_transcoded_mac.mp4' already exists. Overwrite ? [y/N] y
using cpu capabilities: none!
[libx264 @ 0x7fc281031800] profile High, level 5.0
[libx264 @ 0x7fc281031800] 264 - core 129 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=60 rc=crf mbtree=1 crf=22.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'DSCN0468_transcoded_mac.mp4':
  Metadata:
    model           : COOLPIX S5100
    maker           : NIKON
    encoder         : Lavf54.63.104
    Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuvj420p, 1280x720, q=-1--1, 30k tbn, 29.97 tbc
    Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 22050 Hz, mono, fltp, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg -> libx264)
  Stream #0:1 -> #0:1 (pcm_s16le -> aac)
Press [q] to stop, [?] for help
frame=  616 fps=0.6 q=28.0 size=    8205kB time=00:00:20.43 bitrate=3289.5kbits/s

Everything is still at this point, and the output file size does not increase anymore. Also, -threads 0 commonly uses 4 cores here, resulting in approx 400% of CPU usage. When this point is reached, ffmpeg CPU usage is down to 100% and seems not to end.

I tried to transcode to ac3 and it seemed to go over that point.
Then I tried to produce a sample containing only 30 seconds of audio and transcode to aac. The result is:

host-001:No backup luca$ ffmpeg -v 9 -loglevel 99 -i sample.avi -acodec aac -strict -2 out_audio.mp4 -report
ffmpeg started on 2013-06-02 at 14:50:21
Report written to "ffmpeg-20130602-145021.log"
ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
  built on May 20 2013 05:41:01 with Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
  configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libfreetype --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  libavutil      52. 18.100 / 52. 18.100
  libavcodec     54. 92.100 / 54. 92.100
  libavformat    54. 63.104 / 54. 63.104
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 42.103 /  3. 42.103
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
Splitting the commandline.
Reading option '-v' ... matched as option 'v' (set libav* logging level) with argument '9'.
Reading option '-loglevel' ... matched as option 'loglevel' (set libav* logging level) with argument '99'.
Reading option '-i' ... matched as input file with argument 'sample.avi'.
Reading option '-acodec' ... matched as option 'acodec' (force audio codec ('copy' to copy stream)) with argument 'aac'.
Reading option '-strict' ... matched as AVOption 'strict' with argument '-2'.
Reading option 'out_audio.mp4' ... matched as output file.
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 v (set libav* logging level) with argument 9.
Applying option report (generate a report) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input file sample.avi.
Successfully parsed a group of options.
Opening an input file: sample.avi.
[avi @ 0x7fd45a02de00] Format avi probed with size=2048 and score=100
[avi @ 0x7fd459c12700] use odml:1
[avi @ 0x7fd45a02de00] File position before avformat_find_stream_info() is 5652
[avi @ 0x7fd45a02de00] parser not found for codec pcm_s16le, packets or times may be invalid.
    Last message repeated 1 times
[avi @ 0x7fd45a02de00] All info found
[avi @ 0x7fd45a02de00] Estimating duration from bitrate, this may be inaccurate
[avi @ 0x7fd45a02de00] File position after avformat_find_stream_info() is 7164
Guessed Channel Layout for  Input Stream #0.0 : mono
Input #0, avi, from 'sample.avi':
  Metadata:
    encoder         : Lavf54.63.104
  Duration: 00:00:30.65, start: 0.000000, bitrate: 352 kb/s
    Stream #0:0, 1, 1/22050: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono, s16, 352 kb/s
Successfully opened the file.
Parsing a group of options: output file out_audio.mp4.
Applying option acodec (force audio codec ('copy' to copy stream)) with argument aac.
Successfully parsed a group of options.
Opening an output file: out_audio.mp4.
File 'out_audio.mp4' already exists. Overwrite ? [y/N] y
Successfully opened the file.
[abuffer @ 0x7fd459c122e0] Setting entry with key 'time_base' to value '1/22050'
[abuffer @ 0x7fd459c122e0] Setting entry with key 'sample_rate' to value '22050'
[abuffer @ 0x7fd459c122e0] Setting entry with key 'sample_fmt' to value 's16'
[abuffer @ 0x7fd459c122e0] Setting entry with key 'channel_layout' to value '0x4'
[graph 0 input from stream 0:0 @ 0x7fd459c13480] tb:1/22050 samplefmt:s16 samplerate:22050 chlayout:0x4
[aformat @ 0x7fd459c13940] Setting entry with key 'sample_fmts' to value 'fltp'
[aformat @ 0x7fd459c13940] Setting entry with key 'sample_rates' to value '96000,88200,64000,48000,44100,32000,24000,22050,16000,12000,11025,8000,7350'
[audio format for output stream 0:0 @ 0x7fd459c139a0] auto-inserting filter 'auto-inserted resampler 0' between the filter 'Parsed_anull_0' and the filter 'audio format for output stream 0:0'
[auto-inserted resampler 0 @ 0x7fd459c13f00] ch:1 chl:mono fmt:s16 r:22050Hz -> ch:1 chl:mono fmt:fltp r:22050Hz
Output #0, mp4, to 'out_audio.mp4':
  Metadata:
    encoder         : Lavf54.63.104
    Stream #0:0, 0, 1/22050: Audio: aac ([64][0][0][0] / 0x0040), 22050 Hz, mono, fltp, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_s16le -> aac)
Press [q] to stop, [?] for help

No more output.
I'll provide shortly the sample.avi on the upload.ffmpeg.org server with the name aac_stuck_transcoding.avi.

My system is Mac OS X 10.8.3. ffmpeg was built using macports.

[Luca Carlon]

Sample file fit as attachment, so I uploaded here.

[Carl Eugen Hoyos]

Regression since c065255 / dc7e7d4 - fixed in current git head and origin/release/1.2, thank you for the report!