[FFmpeg-trac] #10301(undetermined:new): FFmpeg process go over 100% when adding null audio track

[FFmpeg]

#10301: FFmpeg process go over 100% when adding null audio track
----------------------------------------+----------------------------------
             Reporter:  Anh Trinh       |                     Type:  defect
               Status:  new             |                 Priority:  normal
            Component:  undetermined    |                  Version:  6.0
             Keywords:  anullsrc, H264  |               Blocked By:
             Blocking:                  |  Reproduced by developer:  0
Analyzed by developer:  0               |
----------------------------------------+----------------------------------
 Summary of the bug:
 How to reproduce:
 {{{
 % ffmpeg -i myvideo.mp4 -f lavfi -i
 anullsrc=channel_layout=stereo:sample_rate=48000 -y -acodec aac -ac 1 -b:a
 128k -ar 48000 -vcodec copy -video_track_timescale 90000
 output/myvideo_encoded.mp4

 ffmpeg version 6.0-static https://johnvansickle.com/ffmpeg/  Copyright (c)
 2000-2023 the FFmpeg developers
   built with gcc 8 (Debian 8.3.0-6)
   configuration: --enable-gpl --enable-version3 --enable-static --disable-
 debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio
 --cc=gcc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp
 --enable-libgme --enable-gray --enable-libaom --enable-libfribidi
 --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame
 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
 --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt
 --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab
 --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264
 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid
 --enable-libzvbi --enable-libzimg
   libavutil      58.  2.100 / 58.  2.100
   libavcodec     60.  3.100 / 60.  3.100
   libavformat    60.  3.100 / 60.  3.100
   libavdevice    60.  1.100 / 60.  1.100
   libavfilter     9.  3.100 /  9.  3.100
   libswscale      7.  1.100 /  7.  1.100
   libswresample   4. 10.100 /  4. 10.100
   libpostproc    57.  1.100 / 57.  1.100

 ===================== PLEASE NOTICE THIS ===============================

 [h264 @ 0x5a1c100] error while decoding MB 75 44, bytestream -29
 [h264 @ 0x5a1c100] concealing 54 DC, 54 AC, 54 MV errors in I frame

 ===================== /////////////////// ===============================

 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '20230402-starbulls_rosenheim-
 tilburg_trappers-1680456945-P1.mp4':
   Metadata:
     major_brand     : mp42
     minor_version   : 0
     compatible_brands: mp42isom
     creation_time   : 2023-04-02T17:20:15.000000Z
     encoder         : Dartfish Software 11.1.517.0 (Recorder)
     encoder-eng     : Dartfish Software 11.1.517.0 (Recorder)
     comment         : XEncoder (city/sz)
     comment-eng     : XEncoder (city/sz)
   Duration: 03:01:32.40, start: 0.000000, bitrate: 4129 kb/s
   Stream #0:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661),
 yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 4127 kb/s,
 30 fps, 30 tbr, 30 tbn (default)
     Metadata:
       creation_time   : 2023-04-02T17:20:15.000000Z
       vendor_id       : [0][0][0][0]
       encoder         : H.264/AVC
 Input #1, lavfi, from 'anullsrc=channel_layout=stereo:sample_rate=48000':
   Duration: N/A, start: 0.000000, bitrate: 768 kb/s
   Stream #1:0: Audio: pcm_u8, 48000 Hz, stereo, u8, 768 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
   Stream #1:0 -> #0:1 (pcm_u8 (native) -> aac (native))
 Press [q] to stop, [?] for help
 Output #0, mp4, to 'output/encoded_20230402-starbulls_rosenheim-
 tilburg_trappers-1680456945-P1.mp4':
   Metadata:
     major_brand     : mp42
     minor_version   : 0
     compatible_brands: mp42isom
     comment-eng     : XEncoder (city/sz)
     comment         : XEncoder (city/sz)
     encoder         : Lavf60.3.100
   Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv,
 bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 4127 kb/s, 30
 fps, 30 tbr, 90k tbn (default)
     Metadata:
       creation_time   : 2023-04-02T17:20:15.000000Z
       vendor_id       : [0][0][0][0]
       encoder         : H.264/AVC
   Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp,
 128 kb/s
     Metadata:
       encoder         : Lavc60.3.100 aac


 frame=326775 fps=10473 q=-1.0 Lsize= 5503970kB time=04:07:24.84
 bitrate=3037.3kbits/s speed= 476x
 }}}

 As you can see, the reported duration is 03:01:32.40, but the encoding
 just goes on and on and it doesn't want to complete (see the last output,
 it get to 04:07:24.84). I have to Ctrl + C to stop it.

 Remove the `anullsrc` stuff in the command line stop this from happening.
 Please also notice some error in the output above:

 {{{
 [h264 @ 0x5a1c100] error while decoding MB 75 44, bytestream -29
 [h264 @ 0x5a1c100] concealing 54 DC, 54 AC, 54 MV errors in I frame
 }}}

 The above command happening in 5.1.1, so something in 6.0 is causing this
 issue.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10301>
FFmpeg <https://ffmpeg.org>
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