Extend ffprobe/vf_showinfo time field to milliseconds

[Andrew-R]

Summary of the bug:
How to reproduce:

ffmpeg -i ~/6029.mp4  -copyts -avoid_negative_ts make_zero -c:v copy -c:a pcm_s16le -to 64.600 /dev/shm/6029_cut_2.mp4
ffmpeg version N-112149-ga87a52ed0b Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 11.2.0 (GCC)

ffprobe /dev/shm/6029_cut_2.mp4
ffprobe version N-112149-ga87a52ed0b Copyright (c) 2007-2024 the FFmpeg developers
  built with gcc 11.2.0 (GCC)
  configuration:
  libavutil      58. 36.101 / 58. 36.101
  libavcodec     60. 37.100 / 60. 37.100
  libavformat    60. 20.100 / 60. 20.100
  libavdevice    60.  4.100 / 60.  4.100
  libavfilter     9. 17.100 /  9. 17.100
  libswscale      7.  6.100 /  7.  6.100
  libswresample   4. 13.100 /  4. 13.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/dev/shm/6029_cut_2.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf60.20.100
  Duration: 00:01:04.68, start: 0.080000, bitrate: 2273 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709, progressive), 720x400, 734 kb/s, 25 fps, 25 tbr, 90k tbn (default)
      Metadata:
        handler_name    : VideoHandler
        vendor_id       : [0][0][0][0]
        encoder         : JVT/AVC Coding
  Stream #0:1[0x2](und): Audio: pcm_s16le (ipcm / 0x6D637069), 48000 Hz, stereo, s16, 1536 kb/s (default)
      Metadata:
        handler_name    : SoundHandler
        vendor_id       : [0][0][0][0]

Note that ffprobe output says "Duration: 00:01:04.68" while MB4Box --info says:

MP4Box -info   /dev/shm/6029_cut_2.mp4
* Movie Info *
        Timescale 1000 - 2 tracks
        Computed Duration 00:01:04.879 - Indicated Duration 00:01:04.879
        Fragmented File: no
        File Brand isom - version 512
                Compatible brands: isom iso2 avc1 mp41
        Created: UNKNOWN DATE   Modified: UNKNOWN DATE
File has no MPEG4 IOD/OD

iTunes Info:
        Encoder Software: Lavf60.20.100
1 UDTA types: meta (1)

Track # 1 Info - TrackID 1 - TimeScale 90000
Media Duration 00:01:04.680 - Indicated Duration 00:01:04.800
Track has 2 edit lists: track duration is 00:01:04.879
Media Info: Language "Undetermined (und)" - Type "vide:avc1" - 1617 samples
Visual Sample Entry Info: width=720 height=400 (depth=24 bits)
Visual Track layout: x=0 y=0 width=720 height=400
MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x21
AVC/H264 Video - Visual Size 720 x 400
        AVC Info: 1 SPS - 1 PPS - Profile High @ Level 3
        NAL Unit length bits: 32
        Chroma format YUV 4:2:0 - Luma bit depth 8 - chroma bit depth 8
        SPS#1 hash: E2ADECEA8531A9FC07EE08593AF65A2AD75A3533
        PPS#1 hash: 6BBE60BFBE383CE9144FA78B782534A704912778
Self-synchronized
        RFC6381 Codec Parameters: avc1.64001E
        Average GOP length: 231 samples
        Max sample duration: 3600 / 90000

Track # 2 Info - TrackID 2 - TimeScale 48000
Media Duration 00:01:04.597 - Indicated Duration 00:01:04.597
Track has 2 edit lists: track duration is 00:01:04.699
Media Info: Language "Undetermined (und)" - Type "soun:ipcm" - 3100672 samples
Unknown track type
        RFC6381 Codec Parameters: ipcm
Alternate Group ID 1
        All samples are sync
        Max sample duration: 1 / 48000

Note "track duration is 00:01:04.699"

I think extending ffprobe and vf_showinfo output to include milliseconds will be helpful in bugreporting about cut time inconsistencies

ffmpeg -i /dev/shm/6029_cut_2.mp4 -vf showinfo -f null /dev/null
[skip]
[Parsed_showinfo_0 @ 0xee102580] n:1616 pts:5828400 pts_time:64.76   duration:      0 duration_time:0       fmt:yuv420p cl:left sar:0/1 s:720x400 i:P iskey:0 type:P checksum:07418607 plane_checksum:[A672B48D A7D7BD5B 3D4D1410] mean:[83 158 79] stdev:[9.7 2.3 7.0]
[Parsed_showinfo_0 @ 0xee102580] color_range:tv color_space:smpte170m color_primaries:smpte170m color_trc:bt709

Note pts_time:64.76

[markfilipak]

I have nothing to do with this ticket and was not consulted.

--Mark Filipak.

[Gyan]

There is a limitation with time value displays in showinfo but this is not it. showinfo uses a field width of 7 characters, so it can and does display e.g. 2.96667. When there are fewer characters shown, it means the remaining digits are 0 i.e. pts_time:1 indicates 1.00000.

As for ffprobe, using the bare command will just show the input dump (same as ffmpeg) which is meant to be a summary display. For precision, you should use the sectional display. For input container duration, you would use

ffprobe -show_entries format=duration -i INPUT which will print with microsecond precision, e.g.

[FORMAT]
duration=179.468005
[/FORMAT]