Reproducing

As qtiuto stated the issue is obvious in short clips. I created the following file to reproduce the issue:
https://user-images.githubusercontent.com/86170219/141697007-df47cb57-c430-47f6-b073-63fa1448da0b.mp4

When this file is played not only does the thumb on the progress bar stop before it reaches the end as described by qtiuto, with the onscreen controller time labels configured to show milliseconds they too indicate play stopped short of the end of the file:

Analysis

The values videoDuration and videoPosition in PlaybackInfo are used to determine the location of the thumb on the slider. The values of these two properties originate from the mpv properties duration and time-pos. The following debug logging was added to MPVController.handlePropertyChange to check the state of mpv properties when playback stops:

case MPVOption.PlaybackControl.pause:
  if let paused = UnsafePointer<Bool>(OpaquePointer(property.data))?.pointee {
    Logger.log("MPVOption.PlaybackControl.pause \(paused)")
    Logger.log("mpv property duration \(getDouble(MPVProperty.duration))")
    Logger.log("mpv property eof-reached \(getFlag(MPVProperty.eofReached))")
    Logger.log("mpv property estimated-frame-count \(getDouble(MPVProperty.estimatedFrameCount))")
    Logger.log("mpv property estimated-frame-number \(getDouble(MPVProperty.estimatedFrameNumber))")
    Logger.log("mpv property file-size \(getDouble(MPVProperty.fileSize))")
    Logger.log("mpv property percent-pos \(getDouble(MPVProperty.percentPos))")
    Logger.log("mpv property playback-time \(getDouble(MPVProperty.playbackTime))")
    Logger.log("mpv property playtime-remaining \(getDouble(MPVProperty.playtimeRemaining))")
    Logger.log("mpv property stream-end \(getDouble(MPVProperty.streamEnd))")
    Logger.log("mpv property stream-pos \(getDouble(MPVProperty.streamPos))")
    Logger.log("mpv property time-pos \(getDouble(MPVProperty.timePos))")
    Logger.log("mpv property time-remaining \(getDouble(MPVProperty.timeRemaining))")

This is what the logging showed when run using mpv 0.34.0:

12:21:41.607 [iina][d] MPVOption.PlaybackControl.pause true
12:21:41.607 [iina][d] mpv property duration 1.001
12:21:41.607 [iina][d] mpv property eof-reached true
12:21:41.608 [iina][d] mpv property estimated-frame-count 29.0
12:21:41.608 [iina][d] mpv property estimated-frame-number 28.0
12:21:41.608 [iina][d] mpv property file-size 44613.0
12:21:41.608 [iina][d] mpv property percent-pos 96.66666666666669
12:21:41.608 [iina][d] mpv property playback-time 0.9676333333333333
12:21:41.608 [iina][d] mpv property playtime-remaining 0.033366666666666545
12:21:41.608 [iina][d] mpv property stream-end 44613.0
12:21:41.608 [iina][d] mpv property stream-pos 42149.0
12:21:41.608 [iina][d] mpv property time-pos 0.9676333333333333
12:21:41.608 [iina][d] mpv property time-remaining 0.033366666666666545

The property eof-reached is true and yet percent-pos is not 100%. The same values were seen when run against mpv 0.32.0.

Checking the frames of the video using ffmpeg:

Full ffprobe output

low-batt@gag Movies$ ffprobe -count_frames -hide_banner -pretty -show_format -show_frames -show_streams issue-3331.mp4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'issue-3331.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.76.100
  Duration: 00:00:01.00, start: 0.000000, bitrate: 356 kb/s
  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt709), 640x360 [SAR 1:1 DAR 16:9], 346 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
[FRAME]
media_type=video
stream_index=0
key_frame=1
pkt_pts=0
pkt_pts_time=0:00:00.000000
pkt_dts=0
pkt_dts_time=0:00:00.000000
best_effort_timestamp=0
best_effort_timestamp_time=0:00:00.000000
pkt_duration=1001
pkt_duration_time=0:00:00.033367
pkt_pos=48
pkt_size=7.536133 Kibyte
width=640
height=360
pix_fmt=yuvj420p
sample_aspect_ratio=1:1
pict_type=I
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top_field_first=0
repeat_pict=0
color_range=pc
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color_primaries=bt709
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chroma_location=left
[SIDE_DATA]
side_data_type=H.26[45] User Data Unregistered SEI message
[/SIDE_DATA]
[/FRAME]
[FRAME]
media_type=video
stream_index=0
key_frame=0
pkt_pts=1001
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pkt_duration=1001
pkt_duration_time=0:00:00.033367
pkt_pos=11354
pkt_size=837 byte
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chroma_location=left
[/FRAME]
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pkt_pts_time=0:00:00.066733
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pkt_duration_time=0:00:00.033367
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[/FRAME]
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pkt_duration_time=0:00:00.033367
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[/FRAME]
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[/FRAME]
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[/FRAME]
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[/FRAME]
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[/FRAME]
[FRAME]
media_type=video
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pkt_pts=9009
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[/FRAME]
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[/FRAME]
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[/FRAME]
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[/FRAME]
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[/FRAME]
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top_field_first=0
repeat_pict=0
color_range=pc
color_space=bt709
color_primaries=bt709
color_transfer=bt709
chroma_location=left
[/FRAME]
[FRAME]
media_type=video
stream_index=0
key_frame=0
pkt_pts=24024
pkt_pts_time=0:00:00.800800
pkt_dts=24024
pkt_dts_time=0:00:00.800800
best_effort_timestamp=24024
best_effort_timestamp_time=0:00:00.800800
pkt_duration=1001
pkt_duration_time=0:00:00.033367
pkt_pos=33183
pkt_size=1.408203 Kibyte
width=640
height=360
pix_fmt=yuvj420p
sample_aspect_ratio=1:1
pict_type=P
coded_picture_number=21
display_picture_number=0
interlaced_frame=0
top_field_first=0
repeat_pict=0
color_range=pc
color_space=bt709
color_primaries=bt709
color_transfer=bt709
chroma_location=left
[/FRAME]
[FRAME]
media_type=video
stream_index=0
key_frame=0
pkt_pts=25025
pkt_pts_time=0:00:00.834167
pkt_dts=25025
pkt_dts_time=0:00:00.834167
best_effort_timestamp=25025
best_effort_timestamp_time=0:00:00.834167
pkt_duration=1001
pkt_duration_time=0:00:00.033367
pkt_pos=40297
pkt_size=885 byte
width=640
height=360
pix_fmt=yuvj420p
sample_aspect_ratio=1:1
pict_type=B
coded_picture_number=27
display_picture_number=0
interlaced_frame=0
top_field_first=0
repeat_pict=0
color_range=pc
color_space=bt709
color_primaries=bt709
color_transfer=bt709
chroma_location=left
[/FRAME]
[FRAME]
media_type=video
stream_index=0
key_frame=0
pkt_pts=26026
pkt_pts_time=0:00:00.867533
pkt_dts=26026
pkt_dts_time=0:00:00.867533
best_effort_timestamp=26026
best_effort_timestamp_time=0:00:00.867533
pkt_duration=1001
pkt_duration_time=0:00:00.033367
pkt_pos=38998
pkt_size=1.268555 Kibyte
width=640
height=360
pix_fmt=yuvj420p
sample_aspect_ratio=1:1
pict_type=B
coded_picture_number=26
display_picture_number=0
interlaced_frame=0
top_field_first=0
repeat_pict=0
color_range=pc
color_space=bt709
color_primaries=bt709
color_transfer=bt709
chroma_location=left
[/FRAME]
[FRAME]
media_type=video
stream_index=0
key_frame=0
pkt_pts=27027
pkt_pts_time=0:00:00.900900
pkt_dts=27027
pkt_dts_time=0:00:00.900900
best_effort_timestamp=27027
best_effort_timestamp_time=0:00:00.900900
pkt_duration=1001
pkt_duration_time=0:00:00.033367
pkt_pos=41182
pkt_size=967 byte
width=640
height=360
pix_fmt=yuvj420p
sample_aspect_ratio=1:1
pict_type=B
coded_picture_number=28
display_picture_number=0
interlaced_frame=0
top_field_first=0
repeat_pict=0
color_range=pc
color_space=bt709
color_primaries=bt709
color_transfer=bt709
chroma_location=left
[/FRAME]
[FRAME]
media_type=video
stream_index=0
key_frame=0
pkt_pts=28028
pkt_pts_time=0:00:00.934267
pkt_dts=N/A
pkt_dts_time=N/A
best_effort_timestamp=28028
best_effort_timestamp_time=0:00:00.934267
pkt_duration=1001
pkt_duration_time=0:00:00.033367
pkt_pos=37493
pkt_size=1.469727 Kibyte
width=640
height=360
pix_fmt=yuvj420p
sample_aspect_ratio=1:1
pict_type=P
coded_picture_number=25
display_picture_number=0
interlaced_frame=0
top_field_first=0
repeat_pict=0
color_range=pc
color_space=bt709
color_primaries=bt709
color_transfer=bt709
chroma_location=left
[/FRAME]
[FRAME]
media_type=video
stream_index=0
key_frame=0
pkt_pts=29029
pkt_pts_time=0:00:00.967633
pkt_dts=N/A
pkt_dts_time=N/A
best_effort_timestamp=29029
best_effort_timestamp_time=0:00:00.967633
pkt_duration=1001
pkt_duration_time=0:00:00.033367
pkt_pos=42149
pkt_size=1.225586 Kibyte
width=640
height=360
pix_fmt=yuvj420p
sample_aspect_ratio=1:1
pict_type=P
coded_picture_number=29
display_picture_number=0
interlaced_frame=0
top_field_first=0
repeat_pict=0
color_range=pc
color_space=bt709
color_primaries=bt709
color_transfer=bt709
chroma_location=left
[/FRAME]
[STREAM]
index=0
codec_name=h264
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
profile=High
codec_type=video
codec_tag_string=avc1
codec_tag=0x31637661
width=640
height=360
coded_width=640
coded_height=368
closed_captions=0
has_b_frames=2
sample_aspect_ratio=1:1
display_aspect_ratio=16:9
pix_fmt=yuvj420p
level=30
color_range=pc
color_space=bt709
color_transfer=bt709
color_primaries=bt709
chroma_location=left
field_order=unknown
refs=4
is_avc=true
nal_length_size=4
id=N/A
r_frame_rate=30000/1001
avg_frame_rate=30000/1001
time_base=1/30000
start_pts=0
start_time=0:00:00.000000
duration_ts=30030
duration=0:00:01.001000
bit_rate=346.501000 Kbit/s
max_bit_rate=N/A
bits_per_raw_sample=8
nb_frames=30
nb_read_frames=30
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:language=und
TAG:handler_name=VideoHandler
TAG:vendor_id=[0][0][0][0]
[/STREAM]
[FORMAT]
filename=issue-3331.mp4
nb_streams=1
nb_programs=0
format_name=mov,mp4,m4a,3gp,3g2,mj2
format_long_name=QuickTime / MOV
start_time=0:00:00.000000
duration=0:00:01.001000
size=43.567383 Kibyte
bit_rate=356.547000 Kbit/s
probe_score=100
TAG:major_brand=isom
TAG:minor_version=512
TAG:compatible_brands=isomiso2avc1mp41
TAG:encoder=Lavf58.76.100
[/FORMAT]

The last frame has a pkt_pts_time value of 0:00:00.967633 which matches up with mpv's time-pos value (0.9676333333333333). This confirms qtiuto's report of a one frame gap.

This issue can also be seen in the mpv 0.34.0 GUI. Console output shows mpv pauses short of the end of the file:

low-batt@gag issue-3331$ /Applications/mpv.app/Contents/MacOS/mpv --keep-open=always --osd-fractions issue-3331.mp4 
 (+) Video --vid=1 (*) (h264 640x360 29.970fps)
VO: [libmpv] 640x360 yuv420p
(Paused) V: 00:00:00.968 / 00:00:01.001 (97%)

In the GUI the progress bar stops short of the end:

Fixing

Given this mpv behavior, IINA will have to take into account the value of the mpv eof-reached property when updating the videoPosition property of PlaybackInfo. If true then IINA will need to set videoPosition equal to videoDuration instead of the value of the mpv property time-pos.

I will shortly post a pull request containing that change.

Uh oh!

Progress bar does not reach end when i finish playing a video #3331

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