[FFmpeg-user] Non-monotonous DTS in output stream
Pieter Venter
pietventer at gmail.com
Thu Feb 11 00:25:24 EET 2021
I've found out some new info, but worried about this top post etiquette.
Please help if I'm doing this wrong.
On Tue, Feb 9, 2021 at 7:19 PM Pieter Venter <pietventer at gmail.com> wrote:
> Hello,
>
> I'm trying to process some AVI files that originally came from a Sony
> Handycam to mp4 and managed to get that to work.
> However, a couple of files are giving me trouble and I've spent days
> trying to figure it out.
>
> I'm new here but have done my homework as best I could:
> * I downloaded the latest ffmpeg build I could find.
> * Searched the forums for solutions/switches (-af
> aresample=async=1, -fflags +igndts, -fflags +sortdts).
> * Tried other tools to extract the audio.
> * Past full command and output for your reference.
> * Will try to not "top post". That seems to be a thing here.
>
> If I run the following command, audio is processed correctly up to about
> the 43s mark, then becomes slower than expected (i.e. voices are deep,
> audio in "slow mo" but video plays normal).
>
> The original file plays correctly with VLC and Video on Linux. It does not
> play correctly with mplayer (same slowed down audio issue past 43 seconds).
>
> fmpeg -i input.avi -c:v libx264 -preset fast -crf 21 output.mp4
> ffmpeg version N-55863-g9f38fac053-static
> https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2021 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 56. 64.100 / 56. 64.100
> libavcodec 58.119.100 / 58.119.100
> libavformat 58. 65.101 / 58. 65.101
> libavdevice 58. 11.103 / 58. 11.103
> libavfilter 7.100.100 / 7.100.100
> libswscale 5. 8.100 / 5. 8.100
> libswresample 3. 8.100 / 3. 8.100
> libpostproc 55. 8.100 / 55. 8.100
> [avi @ 0x620c340] Switching to NI mode, due to poor interleaving
> Input #0, avi, from 'input.avi':
> Duration: 00:07:00.00, start: 0.000000, bitrate: 28806 kb/s
> Stream #0:0: Video: dvvideo, yuv420p, 720x576 [SAR 16:15 DAR 4:3],
> 25000 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
> Stream #0:1: Audio: pcm_s16le, 32000 Hz, stereo, s16, 1024 kb/s
> Stream #0:2: Audio: pcm_s16le, 32000 Hz, stereo, s16, 1024 kb/s
> Stream mapping:
> Stream #0:0 -> #0:0 (dvvideo (native) -> h264 (libx264))
> Stream #0:1 -> #0:1 (pcm_s16le (native) -> aac (native))
> Press [q] to stop, [?] for help
> [libx264 @ 0x6233580] using SAR=16/15
> [libx264 @ 0x6233580] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
> AVX FMA3 BMI2 AVX2
> [libx264 @ 0x6233580] profile High, level 3.0, 4:2:0, 8-bit
> [libx264 @ 0x6233580] 264 - core 161 r3040 35417dc - H.264/MPEG-4 AVC
> codec - Copyleft 2003-2021 - http://www.videolan.org/x264.html - options:
> cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=6 psy=1
> psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1
> cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12
> lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0
> bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1
> b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=250 keyint_min=25
> scenecut=40 intra_refresh=0 rc_lookahead=30 rc=crf mbtree=1 crf=21.0
> qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
> Output #0, mp4, to 'output.mp4':
> Metadata:
> encoder : Lavf58.65.101
> Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv420p(bottom coded
> first (swapped)), 720x576 [SAR 16:15 DAR 4:3], q=2-31, 25 fps, 12800 tbn
> Metadata:
> encoder : Lavc58.119.100 libx264
> Side data:
> cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
> Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 32000 Hz, stereo,
> fltp, 128 kb/s
> Metadata:
> encoder : Lavc58.119.100 aac
> frame=10500 fps=116 q=-1.0 Lsize= 168876kB time=00:07:00.02
> bitrate=3293.7kbits/s speed=4.63x
> video:158898kB audio:9545kB subtitle:0kB other streams:0kB global
> headers:0kB muxing overhead: 0.257381%
> [libx264 @ 0x6233580] frame I:93 Avg QP:20.65 size: 54098
> [libx264 @ 0x6233580] frame P:3607 Avg QP:23.10 size: 22302
> [libx264 @ 0x6233580] frame B:6800 Avg QP:24.65 size: 11358
> [libx264 @ 0x6233580] consecutive B-frames: 13.4% 0.6% 0.7% 85.3%
> [libx264 @ 0x6233580] mb I I16..4: 1.2% 98.2% 0.6%
> [libx264 @ 0x6233580] mb P I16..4: 0.5% 32.9% 0.4% P16..4: 35.4% 17.7%
> 9.8% 0.0% 0.0% skip: 3.2%
> [libx264 @ 0x6233580] mb B I16..4: 2.2% 25.7% 0.2% B16..8: 22.8% 8.7%
> 0.7% direct:28.9% skip:10.8% L0:40.2% L1:32.6% BI:27.2%
> [libx264 @ 0x6233580] 8x8 transform intra:93.9% inter:82.3%
> [libx264 @ 0x6233580] coded y,uvDC,uvAC intra: 82.4% 88.7% 30.9% inter:
> 40.1% 65.9% 1.2%
> [libx264 @ 0x6233580] i16 v,h,dc,p: 21% 19% 34% 26%
> [libx264 @ 0x6233580] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 14% 40% 5% 5%
> 5% 5% 6% 6%
> [libx264 @ 0x6233580] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 9% 54% 15% 4% 4%
> 3% 4% 3% 4%
> [libx264 @ 0x6233580] i8c dc,h,v,p: 59% 19% 19% 3%
> [libx264 @ 0x6233580] Weighted P-Frames: Y:8.2% UV:1.4%
> [libx264 @ 0x6233580] ref P L0: 56.9% 43.1%
> [libx264 @ 0x6233580] ref B L0: 74.0% 26.0%
> [libx264 @ 0x6233580] ref B L1: 95.3% 4.7%
> [libx264 @ 0x6233580] kb/s:3099.25
> [aac @ 0x6234fc0] Qavg: 189.772
>
> Trying to narrow down the problem area, I did the following - just encode
> up to the 43s mark and dump the audio.
> If I run it for the whole file, there are hundreds, if not thousands of
> entries like " Non-monotonous DTS..."
>
> ffmpeg -t 00:00:43 -i input.avi -map 0:a:0 -c:a aac output.avi
> ffmpeg version N-55863-g9f38fac053-static
> https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2021 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 56. 64.100 / 56. 64.100
> libavcodec 58.119.100 / 58.119.100
> libavformat 58. 65.101 / 58. 65.101
> libavdevice 58. 11.103 / 58. 11.103
> libavfilter 7.100.100 / 7.100.100
> libswscale 5. 8.100 / 5. 8.100
> libswresample 3. 8.100 / 3. 8.100
> libpostproc 55. 8.100 / 55. 8.100
> [avi @ 0x5b922c0] Switching to NI mode, due to poor interleaving
> Input #0, avi, from 'input.avi':
> Duration: 00:07:00.00, start: 0.000000, bitrate: 28806 kb/s
> Stream #0:0: Video: dvvideo, yuv420p, 720x576 [SAR 16:15 DAR 4:3],
> 25000 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
> Stream #0:1: Audio: pcm_s16le, 32000 Hz, stereo, s16, 1024 kb/s
> Stream #0:2: Audio: pcm_s16le, 32000 Hz, stereo, s16, 1024 kb/s
> File 'output.avi' already exists. Overwrite? [y/N] y
> Stream mapping:
> Stream #0:1 -> #0:0 (pcm_s16le (native) -> aac (native))
> Press [q] to stop, [?] for help
> Output #0, avi, to 'output.avi':
> Metadata:
> ISFT : Lavf58.65.101
> Stream #0:0: Audio: aac (LC) ([255][0][0][0] / 0x00FF), 32000 Hz,
> stereo, fltp, 128 kb/s
> Metadata:
> encoder : Lavc58.119.100 aac
> [avi @ 0x5bb8040] Non-monotonous DTS in output stream 0:0; previous: 1341,
> current: 1339; changing to 1342. This may result in incorrect timestamps in
> the output file.
> [avi @ 0x5bb8040] Non-monotonous DTS in output stream 0:0; previous: 1342,
> current: 1340; changing to 1343. This may result in incorrect timestamps in
> the output file.
> [avi @ 0x5bb8040] Non-monotonous DTS in output stream 0:0; previous: 1343,
> current: 1340; changing to 1344. This may result in incorrect timestamps in
> the output file.
> [avi @ 0x5bb8040] Non-monotonous DTS in output stream 0:0; previous: 1344,
> current: 1341; changing to 1345. This may result in incorrect timestamps in
> the output file.
> [avi @ 0x5bb8040] Non-monotonous DTS in output stream 0:0; previous: 1345,
> current: 1342; changing to 1346. This may result in incorrect timestamps in
> the output file.
> [avi @ 0x5bb8040] Non-monotonous DTS in output stream 0:0; previous: 1346,
> current: 1342; changing to 1347. This may result in incorrect timestamps in
> the output file.
> [avi @ 0x5bb8040] Non-monotonous DTS in output stream 0:0; previous: 1347,
> current: 1343; changing to 1348. This may result in incorrect timestamps in
> the output file.
> [avi @ 0x5bb8040] Non-monotonous DTS in output stream 0:0; previous: 1348,
> current: 1343; changing to 1349. This may result in incorrect timestamps in
> the output file.
> size= 714kB time=00:00:43.16 bitrate= 135.6kbits/s speed=96.2x
> video:0kB audio:676kB subtitle:0kB other streams:0kB global headers:0kB
> muxing overhead: 5.592729%
> [aac @ 0x5bb9980] Qavg: 225.541
>
> The only solution I could find so far is to
> a. extract all the audio using ffmpeg (total audio file lengh is 10m09s)
> b. use audacity to carefully select the audio from 0m43s to the end and
> "shrink" it down to a total of 7m00s (the original file length)
> c. create a new video file from the processed audio stream
>
> Is there a way to troubleshoot, ignore, correct the Non-monotonous DTS
> error?
> Thanks for your help.
>
>
Using the -debug_ts switch, I can now see that the second audio channel
stops at 42.52
muxer <- type:audio pkt_pts:1060 pkt_pts_time:42.4 pkt_dts:1060
pkt_dts_time:42.4 size:5120
demuxer -> ist_index:1 type:audio next_dts:42400000 next_dts_time:42.4
next_pts:42400000 next_pts_time:42.4 pkt_pts:1061 pkt_pts_time:42.44
pkt_dts:1061 pkt_dts_time:42.44 off:0 off_time:0
demuxer+ffmpeg -> ist_index:1 type:audio pkt_pts:1061 pkt_pts_time:42.44
pkt_dts:1061 pkt_dts_time:42.44 off:0 off_time:0
muxer <- type:audio pkt_pts:1061 pkt_pts_time:42.44 pkt_dts:1061
pkt_dts_time:42.44 size:5120
demuxer -> ist_index:2 type:audio next_dts:42400000 next_dts_time:42.4
next_pts:42400000 next_pts_time:42.4 pkt_pts:1061 pkt_pts_time:42.44
pkt_dts:1061 pkt_dts_time:42.44 off:0 off_time:0
demuxer+ffmpeg -> ist_index:2 type:audio pkt_pts:1061 pkt_pts_time:42.44
pkt_dts:1061 pkt_dts_time:42.44 off:0 off_time:0
muxer <- type:audio pkt_pts:1061 pkt_pts_time:42.44 pkt_dts:1061
pkt_dts_time:42.44 size:5120
demuxer -> ist_index:1 type:audio next_dts:42440000 next_dts_time:42.44
next_pts:42440000 next_pts_time:42.44 pkt_pts:1062 pkt_pts_time:42.48
pkt_dts:1062 pkt_dts_time:42.48 off:0 off_time:0
demuxer+ffmpeg -> ist_index:1 type:audio pkt_pts:1062 pkt_pts_time:42.48
pkt_dts:1062 pkt_dts_time:42.48 off:0 off_time:0
muxer <- type:audio pkt_pts:1062 pkt_pts_time:42.48 pkt_dts:1062
pkt_dts_time:42.48 size:5120
demuxer -> ist_index:2 type:audio next_dts:42440000 next_dts_time:42.44
next_pts:42440000 next_pts_time:42.44 pkt_pts:1062 pkt_pts_time:42.48
pkt_dts:1062 pkt_dts_time:42.48 off:0 off_time:0
demuxer+ffmpeg -> ist_index:2 type:audio pkt_pts:1062 pkt_pts_time:42.48
pkt_dts:1062 pkt_dts_time:42.48 off:0 off_time:0
muxer <- type:audio pkt_pts:1062 pkt_pts_time:42.48 pkt_dts:1062
pkt_dts_time:42.48 size:5120
demuxer -> ist_index:1 type:audio next_dts:42480000 next_dts_time:42.48
next_pts:42480000 next_pts_time:42.48 pkt_pts:1063 pkt_pts_time:42.52
pkt_dts:1063 pkt_dts_time:42.52 off:0 off_time:0
demuxer+ffmpeg -> ist_index:1 type:audio pkt_pts:1063 pkt_pts_time:42.52
pkt_dts:1063 pkt_dts_time:42.52 off:0 off_time:0
muxer <- type:audio pkt_pts:1063 pkt_pts_time:42.52 pkt_dts:1063
pkt_dts_time:42.52 size:5120
demuxer -> ist_index:2 type:audio next_dts:42480000 next_dts_time:42.48
next_pts:42480000 next_pts_time:42.48 pkt_pts:1063 pkt_pts_time:42.52
pkt_dts:1063 pkt_dts_time:42.52 off:0 off_time:0
demuxer+ffmpeg -> ist_index:2 type:audio pkt_pts:1063 pkt_pts_time:42.52
pkt_dts:1063 pkt_dts_time:42.52 off:0 off_time:0
>From this point forward, no more channel 2 for audio
muxer <- type:audio pkt_pts:1063 pkt_pts_time:42.52 pkt_dts:1063
pkt_dts_time:42.52 size:5120
demuxer -> ist_index:1 type:audio next_dts:42520000 next_dts_time:42.52
next_pts:42520000 next_pts_time:42.52 pkt_pts:1064 pkt_pts_time:42.56
pkt_dts:1064 pkt_dts_time:42.56 off:0 off_time:0
demuxer+ffmpeg -> ist_index:1 type:audio pkt_pts:1064 pkt_pts_time:42.56
pkt_dts:1064 pkt_dts_time:42.56 off:0 off_time:0
muxer <- type:audio pkt_pts:1064 pkt_pts_time:42.56 pkt_dts:1064
pkt_dts_time:42.56 size:7680
demuxer -> ist_index:1 type:audio next_dts:42560000 next_dts_time:42.56
next_pts:42560000 next_pts_time:42.56 pkt_pts:1065 pkt_pts_time:42.6
pkt_dts:1065 pkt_dts_time:42.6 off:0 off_time:0
demuxer+ffmpeg -> ist_index:1 type:audio pkt_pts:1065 pkt_pts_time:42.6
pkt_dts:1065 pkt_dts_time:42.6 off:0 off_time:0
muxer <- type:audio pkt_pts:1065 pkt_pts_time:42.6 pkt_dts:1065
pkt_dts_time:42.6 size:7680
demuxer -> ist_index:1 type:audio next_dts:42600000 next_dts_time:42.6
next_pts:42600000 next_pts_time:42.6 pkt_pts:1066 pkt_pts_time:42.64
pkt_dts:1066 pkt_dts_time:42.64 off:0 off_time:0
demuxer+ffmpeg -> ist_index:1 type:audio pkt_pts:1066 pkt_pts_time:42.64
pkt_dts:1066 pkt_dts_time:42.64 off:0 off_time:0
muxer <- type:audio pkt_pts:1066 pkt_pts_time:42.64 pkt_dts:1066
pkt_dts_time:42.64 size:7680
demuxer -> ist_index:1 type:audio next_dts:42640000 next_dts_time:42.64
next_pts:42640000 next_pts_time:42.64 pkt_pts:1067 pkt_pts_time:42.68
pkt_dts:1067 pkt_dts_time:42.68 off:0 off_time:0
demuxer+ffmpeg -> ist_index:1 type:audio pkt_pts:1067 pkt_pts_time:42.68
pkt_dts:1067 pkt_dts_time:42.68 off:0 off_time:0
muxer <- type:audio pkt_pts:1067 pkt_pts_time:42.68 pkt_dts:1067
pkt_dts_time:42.68 size:7680
demuxer -> ist_index:1 type:audio next_dts:42680000 next_dts_time:42.68
next_pts:42680000 next_pts_time:42.68 pkt_pts:1068 pkt_pts_time:42.72
pkt_dts:1068 pkt_dts_time:42.72 off:0 off_time:0
demuxer+ffmpeg -> ist_index:1 type:audio pkt_pts:1068 pkt_pts_time:42.72
pkt_dts:1068 pkt_dts_time:42.72 off:0 off_time:0
I've tried just excluding that audio stream, but the remaining audio is
still weird
ffmpeg -i input.avi -map 0 -map -0:a:1 -c copy output.avi
ffmpeg version N-55863-g9f38fac053-static https://johnvansickle.com/ffmpeg/
Copyright (c) 2000-2021 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 56. 64.100 / 56. 64.100
libavcodec 58.119.100 / 58.119.100
libavformat 58. 65.101 / 58. 65.101
libavdevice 58. 11.103 / 58. 11.103
libavfilter 7.100.100 / 7.100.100
libswscale 5. 8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
libpostproc 55. 8.100 / 55. 8.100
[avi @ 0x599e300] Switching to NI mode, due to poor interleaving
Input #0, avi, from 'input.avi':
Duration: 00:07:00.00, start: 0.000000, bitrate: 28806 kb/s
Stream #0:0: Video: dvvideo, yuv420p, 720x576 [SAR 16:15 DAR 4:3],
25000 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
Stream #0:1: Audio: pcm_s16le, 32000 Hz, stereo, s16, 1024 kb/s
Stream #0:2: Audio: pcm_s16le, 32000 Hz, stereo, s16, 1024 kb/s
File 'output.avi' already exists. Overwrite? [y/N] y
Output #0, avi, to 'output.avi':
Metadata:
ISFT : Lavf58.65.101
Stream #0:0: Video: dvvideo (dvsd / 0x64737664), yuv420p, 720x576 [SAR
16:15 DAR 4:3], q=2-31, 25000 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 32000 Hz,
stereo, s16, 1024 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=10500 fps=8868 q=-1.0 Lsize= 1553212kB time=00:07:00.00
bitrate=30295.0kbits/s speed= 355x
video:1476562kB audio:76090kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 0.036054%
Any advice would be welcome, thanks.
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