CODEWITHSUNDEEP
ffmpegmp4x264libx264
Byron Whitlock
Byron Whitlock

Reputation: 53850

FFMPEG creates incorrect Source duration

When transcoding movies from an AVI to mp4 sometimes FFMPEG sets the "Source Duration" incorrectly.

This messes up playback on IOS devices. Specifically, it causes the video to cut out at "Source duration" while the audio still plays.

enter image description here

FFMPEG output transcode doesn't' show anything odd at all. Looks normal, no errors or warnings.

Thanks.

Log is below. 

ffmpeg version N-77455-g4707497 Copyright (c) 2000-2015 the FFmpeg developers   built with gcc 5.2.0 (GCC)   configuration: --enable-gpl
    --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib   libavutil      55. 11.100 / 55. 11.100   libavcodec     57. 20.100 / 57. 20.100   libavformat    57. 20.100 / 57. 20.100   libavdevice    57.  0.100 / 57.  0.100   libavfilter     6. 21.101 / 
    6. 21.101   libswscale      4.  0.100 /  4.  0.100   libswresample   2.  0.101 /  2.  0.101   libpostproc    54.  0.100 / 54.  0.100 Input #0, avi, from 'E:\MEDIA\Central.Intelligence.2016.HC.HDRip.XviD.AC3-EVO\Central.Intelligence.2016.HC.HDRip.XviD.AC3-EVO.avi': Metadata:
        encoder         : VirtualDubMod 1.5.10.2 (build 2542/release)   Duration: 01:51:43.27, start: 0.000000, bitrate: 1765 kb/s
        Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 720x304 [SAR 1:1 DAR 45:19], 1563 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 23.98 tbc
        Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, fltp, 192 kb/s [libx264 @ 000000f3c80a0a80] using SAR=405/304 [libx264 @ 000000f3c80a0a80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2 [libx264 @ 000000f3c80a0a80] profile High, level 3.1 [libx264 @ 000000f3c80a0a80] 264 - core 148 r2638 7599210 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 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=6 lookahead_threads=1 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=2 keyint=250 keyint_min=23 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=1280 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, mp4, to 'F:\STREAMS\Central.Intelligence.2016.HC.HDRip.XviD.AC3-EVO.avi.1280x720_1000kbps.TEMP.mp4': Metadata:
        encoder         : Lavf57.20.100
        Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1280x720 [SAR 405:304 DAR 45:19], q=-1--1, 1280 kb/s, 23.98 fps, 10000k tbn, 23.98 tbc
        Metadata:
          encoder         : Lavc57.20.100 libx264
        Side data:
          unknown side data type 10 (24 bytes)
        Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 160 kb/s
        Metadata:
          encoder         : Lavc57.20.100 aac Stream mapping:   Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (libx264))   Stream #0:1 -> #0:1 (ac3 (native) -> aac (native)) Press [q] to stop, [?] for help [mpeg4 @ 000000f3c80ae220] Video uses a non-standard and wasteful way to store B-frames ('packed B-frames'). Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it. 
frame=   15 fps=0.0 q=0.0 size=       0kB time=00:00:01.18 bitrate=   0.3kbits/s dup=1 drop=0 speed=2.36x   
--SNIP---
frame=160704 fps= 16 q=30.0 size= 1180376kB time=01:51:43.08 bitrate=1442.6kbits/s dup=1 drop=0 speed=0.671x     
[libx264 @ 0000001f60c5d900] frame I:1167  Avg QP:19.08  size: 44465
[libx264 @ 0000001f60c5d900] frame P:63049 Avg QP:22.26  size: 12774
[libx264 @ 0000001f60c5d900] frame B:110691 Avg QP:24.81  size:  2739
[libx264 @ 0000001f60c5d900] consecutive B-frames:  6.0% 22.8% 18.3% 53.0%
[libx264 @ 0000001f60c5d900] mb I  I16..4: 14.0% 76.1%  9.9%
[libx264 @ 0000001f60c5d900] mb P  I16..4:  2.5%  6.6%  0.4%  P16..4: 44.5% 10.8%  5.2%  0.0%  0.0%    skip:30.0%
[libx264 @ 0000001f60c5d900] mb B  I16..4:  0.1%  0.3%  0.0%  B16..8: 32.1%  1.6%  0.2%  direct: 0.9%  skip:64.9%  L0:37.9% L1:58.7% BI: 3.5%
[libx264 @ 0000001f60c5d900] final ratefactor: 23.25
[libx264 @ 0000001f60c5d900] 8x8 transform intra:70.8% inter:85.8%
[libx264 @ 0000001f60c5d900] coded y,uvDC,uvAC intra: 47.1% 56.6% 19.5% inter: 10.7% 14.2% 0.4%
[libx264 @ 0000001f60c5d900] i16 v,h,dc,p: 46% 20%  8% 26%
[libx264 @ 0000001f60c5d900] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 17% 25%  5%  7%  7%  7%  6%  6%
[libx264 @ 0000001f60c5d900] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 20% 12%  5% 10%  9%  8%  5%  4%
[libx264 @ 0000001f60c5d900] i8c dc,h,v,p: 58% 18% 18%  6%
[libx264 @ 0000001f60c5d900] Weighted P-Frames: Y:1.4% UV:0.8%
[libx264 @ 0000001f60c5d900] ref P L0: 62.6% 12.9% 18.9%  5.6%  0.1%
[libx264 @ 0000001f60c5d900] ref B L0: 87.6% 11.0%  1.4%
[libx264 @ 0000001f60c5d900] ref B L1: 94.6%  5.4%
[libx264 @ 0000001f60c5d900] kb/s:1272.59
[aac @ 0000001f60b52180] Qavg: 954.859

Edit

This has something to do with data, when I run this command (cut at 10 minutes)

ffmpeg.exe -i CI.mp4 -ss 00:00:00 -t 00:08:00 -vcodec copy  -map_metadata 0 -acodec copy CI2.mp4

Mediainfo shows 

Duration                    : 9mn 49s
Source duration             : 2mn 40s

When I run this one (18 minutes)

ffmpeg.exe -i CI.mp4 -ss 00:00:00 -t 00:18:00 -vcodec copy  -map_metadata 0 -acodec copy CI2.mp4

Mediainfo shows

Duration                    : 17mn 49s
Source duration             : 3mn 30s

How can I edit the metadata directly

Upvotes: 4

Views: 4731

Answers (1)

user14270782
user14270782

Reputation: 11

Recently, I run into a similar problem. I had 3 similar (1080x1920, ie portrait) MP4 videos taken by a mobile phone. I converted them to 1280x720 (landscape) by using to following ffmpeg command:

fmpeg -i input.MP4 -vf "scale=w=1280:h=720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2" -c:a copy -y output.MP4

It resizes the video and adds wide black bars on both sides. Two of the resulting videos were ok, byt the third crashed my video editor. It could be displayed by VLC, however. I checked with MediaInfo its tags, and it had a Source duration video tag (never seen it before). Its value was 9 s 628 ms, while Duration was 48 s 21 ms. The other two videos did not have Source duration tags. Because VLC could display it, I tried to use it to correct the video as follows (I have Advanced Controls checked in the View menu):

  1. Selected Media -> Convert/Save...
  2. Add... -> browsed the input.MP4 -> Open
  3. Convert/Save -> Convert
  4. Selected Profile Video - H.264 + MP3(MP4), clicked Edit selected profile button
  5. Encapsulation tab, MP4/MOV, all Features except Chapters
  6. Video codec tab, checked Video and Keep original video track
  7. Audio codec tab, checked Audio and Keep original audio track
  8. Subtitles tab, unchecked Subtitles because the video did not have them
  9. Save
  10. Browse destination file, browsed output folder, entered tilename of output.MP4
  11. Save
  12. Start

VLC did the "conversion" fast, and voila! According to MediaInfo there was no more a Source duration tag and my video editor willingly accepted the resulting video.

Upvotes: 1

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