Using Smart Cut makes Subtitles unsynchronized

[yFotouh]

The fewer issues I have to read, the more new features I will have time to implement, so I ask that you please try these things first

• Try with the newest version from GitHub (also it might have already been fixed in latest nightly build)
• Read the documentation and FAQ, Known issues, Troubleshooting
• Search for your problem under Issues or Discussions
• If you have a problem only with a particular file (or file type), use this form instead
• Windows 7, 8 and 8.1 are no longer supported. This is not a question about Windows 8.1 or older.

Operating System

Windows 10

Steps to reproduce

I'm trying to achieve very precise cuts in a video file , and the smart cut feature helped me achieve that , however it made the subtitles unsynchronized.
Steps :
-Open a video file "vid.mp4" in Lossless cut.
-Add video subtitles "subtitles.srt" in tracks section.
-Exported Video with subtitles "vid with subtitles.mp4"
-File -> close or restart Lossless cut.
-Open exported video "vid with subtitles.mp4".
-Start making segments to export.
-Segments -> Invert all segments on timeline (i mainly want to remove parts from the video)
-Export video (Merge Cuts) using Smart Cut feature.

Expected behavior

The final video should have subtitles synchronized

Actual behavior

The final video subtitles are not synchronized using smart cut feature.
The subtitles are okay when not using smart cut feature , however without using smart cut , the cuts result are not accurate.

Share log from developer tools

No response

[mifi]

could you share some more information about your file? see the help menu (report an error)

[yFotouh]

Sure.
This is the original file information :

No error occurred.

{
"err": false,
"state": {
"ffmpegExperimental": false,
"preserveMovData": false,
"movFastStart": true,
"preserveMetadataOnMerge": false,
"filePath": "...\Monster.Pets.A.Hotel.Transylvania.Short.Film.2021.1080p.WEBRip.x264.AAC5.1-[YTS.MX].mp4",
"fileFormat": "mp4",
"externalFilesMeta": {},
"mainStreams": [
{
"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": 1920,
"height": 1040,
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"closed_captions": 0,
"film_grain": 0,
"has_b_frames": 2,
"sample_aspect_ratio": "255:254",
"display_aspect_ratio": "3060:1651",
"pix_fmt": "yuv420p",
"level": 41,
"color_range": "tv",
"color_space": "bt709",
"color_transfer": "bt709",
"color_primaries": "bt709",
"chroma_location": "left",
"field_order": "progressive",
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"duration": "351.768083",
"bit_rate": "2242581",
"bits_per_raw_sample": "8",
"nb_frames": "8434",
"extradata_size": 53,
"disposition": {
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"karaoke": 0,
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"clean_effects": 0,
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"descriptions": 0,
"metadata": 0,
"dependent": 0,
"still_image": 0
},
"tags": {
"language": "und",
"handler_name": "VideoHandler",
"vendor_id": "[0][0][0][0]"
}
},
{
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"codec_name": "aac",
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"profile": "LC",
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"codec_tag_string": "mp4a",
"codec_tag": "0x6134706d",
"sample_fmt": "fltp",
"sample_rate": "48000",
"channels": 6,
"channel_layout": "5.1",
"bits_per_sample": 0,
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"id": "0x2",
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},
"tags": {
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],
"copyStreamIdsByFile": {
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"0": true,
"1": true
}
},
"cutSegments": [
{}
],
"mainFileFormatData": {
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"nb_streams": 2,
"nb_programs": 0,
"format_name": "mov,mp4,m4a,3gp,3g2,mj2",
"format_long_name": "QuickTime / MOV",
"start_time": "0.000000",
"duration": "351.776000",
"size": "115735563",
"bit_rate": "2632028",
"probe_score": 100,
"tags": {
"major_brand": "isom",
"minor_version": "512",
"compatible_brands": "isomiso2avc1mp41",
"encoder": "Lavf58.67.100"
}
},
"rotation": 360,
"shortestFlag": false,
"effectiveExportMode": "merge",
"outSegTemplate": "${FILENAME}-${CUT_FROM}-${CUT_TO}${SEG_SUFFIX}${EXT}"
},
"platform": "win32",
"version": "3.61.1"
}
############################################################################
The file info. after adding subtitles and exporting :

No error occurred.

{
"err": false,
"state": {
"ffmpegExperimental": false,
"preserveMovData": false,
"movFastStart": true,
"preserveMetadataOnMerge": false,
"filePath": "...\soft subtitle.mp4",
"fileFormat": "mp4",
"externalFilesMeta": {},
"mainStreams": [
{
"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": 1920,
"height": 1040,
"coded_width": 1920,
"coded_height": 1040,
"closed_captions": 0,
"film_grain": 0,
"has_b_frames": 2,
"sample_aspect_ratio": "255:254",
"display_aspect_ratio": "3060:1651",
"pix_fmt": "yuv420p",
"level": 41,
"color_range": "tv",
"color_space": "bt709",
"color_transfer": "bt709",
"color_primaries": "bt709",
"chroma_location": "left",
"field_order": "progressive",
"refs": 1,
"is_avc": "true",
"nal_length_size": "4",
"id": "0x1",
"r_frame_rate": "24000/1001",
"avg_frame_rate": "24000/1001",
"time_base": "1/24000",
"start_pts": 0,
"start_time": "0.000000",
"duration_ts": 8442434,
"duration": "351.768083",
"bit_rate": "2242581",
"bits_per_raw_sample": "8",
"nb_frames": "8434",
"extradata_size": 53,
"disposition": {
"default": 1,
"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 0,
"timed_thumbnails": 0,
"captions": 0,
"descriptions": 0,
"metadata": 0,
"dependent": 0,
"still_image": 0
},
"tags": {
"language": "und",
"handler_name": "VideoHandler",
"vendor_id": "[0][0][0][0]"
}
},
{
"index": 1,
"codec_name": "aac",
"codec_long_name": "AAC (Advanced Audio Coding)",
"profile": "LC",
"codec_type": "audio",
"codec_tag_string": "mp4a",
"codec_tag": "0x6134706d",
"sample_fmt": "fltp",
"sample_rate": "48000",
"channels": 6,
"channel_layout": "5.1",
"bits_per_sample": 0,
"initial_padding": 0,
"id": "0x2",
"r_frame_rate": "0/0",
"avg_frame_rate": "0/0",
"time_base": "1/48000",
"start_pts": 0,
"start_time": "0.000000",
"duration_ts": 16885248,
"duration": "351.776000",
"bit_rate": "384011",
"nb_frames": "16492",
"extradata_size": 2,
"disposition": {
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"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 0,
"timed_thumbnails": 0,
"captions": 0,
"descriptions": 0,
"metadata": 0,
"dependent": 0,
"still_image": 0
},
"tags": {
"language": "und",
"handler_name": "SoundHandler",
"vendor_id": "[0][0][0][0]"
}
},
{
"index": 2,
"codec_name": "mov_text",
"codec_long_name": "MOV text",
"codec_type": "subtitle",
"codec_tag_string": "tx3g",
"codec_tag": "0x67337874",
"id": "0x3",
"r_frame_rate": "0/0",
"avg_frame_rate": "0/0",
"time_base": "1/1000000",
"start_pts": 0,
"start_time": "0.000000",
"duration_ts": 350759000,
"duration": "350.759000",
"bit_rate": "57",
"nb_frames": "98",
"extradata_size": 68,
"disposition": {
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"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 0,
"timed_thumbnails": 0,
"captions": 0,
"descriptions": 0,
"metadata": 0,
"dependent": 0,
"still_image": 0
},
"tags": {
"language": "und",
"handler_name": "SubtitleHandler"
}
}
],
"copyStreamIdsByFile": {
"...\soft subtitle.mp4": {
"0": true,
"1": true,
"2": true
}
},
"cutSegments": [
{
"start": 0,
"end": 60
},
{
"start": 120,
"end": 180
},
{
"start": 240,
"end": 351.776
}
],
"mainFileFormatData": {
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"nb_streams": 3,
"nb_programs": 0,
"format_name": "mov,mp4,m4a,3gp,3g2,mj2",
"format_long_name": "QuickTime / MOV",
"start_time": "0.000000",
"duration": "351.776000",
"size": "115741215",
"bit_rate": "2632157",
"probe_score": 100,
"tags": {
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"minor_version": "512",
"compatible_brands": "isomiso2avc1mp41",
"encoder": "Lavf60.3.100"
}
},
"rotation": 360,
"shortestFlag": false,
"effectiveExportMode": "merge",
"outSegTemplate": "${FILENAME}-${CUT_FROM}-${CUT_TO}${SEG_SUFFIX}${EXT}"
},
"platform": "win32",
"version": "3.61.1"
}

############################################################################
The file info. after cutting and merging the last exported file with subtitles :

No error occurred.

{
"err": false,
"state": {
"ffmpegExperimental": false,
"preserveMovData": false,
"movFastStart": true,
"preserveMetadataOnMerge": false,
"filePath": "...\cut with subtitle.mp4",
"fileFormat": "mp4",
"externalFilesMeta": {},
"mainStreams": [
{
"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": 1920,
"height": 1040,
"coded_width": 1920,
"coded_height": 1040,
"closed_captions": 0,
"film_grain": 0,
"has_b_frames": 2,
"sample_aspect_ratio": "255:254",
"display_aspect_ratio": "3060:1651",
"pix_fmt": "yuv420p",
"level": 41,
"color_range": "tv",
"color_space": "bt709",
"color_transfer": "bt709",
"color_primaries": "bt709",
"chroma_location": "left",
"field_order": "progressive",
"refs": 1,
"is_avc": "true",
"nal_length_size": "4",
"id": "0x1",
"r_frame_rate": "24000/1001",
"avg_frame_rate": "22240000/927623",
"time_base": "1/24000",
"start_pts": 1008,
"start_time": "0.042000",
"duration_ts": 5565738,
"duration": "231.905750",
"bit_rate": "2029787",
"bits_per_raw_sample": "8",
"nb_frames": "5560",
"extradata_size": 53,
"disposition": {
"default": 1,
"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 0,
"timed_thumbnails": 0,
"captions": 0,
"descriptions": 0,
"metadata": 0,
"dependent": 0,
"still_image": 0
},
"tags": {
"language": "und",
"handler_name": "VideoHandler",
"vendor_id": "[0][0][0][0]"
}
},
{
"index": 1,
"codec_name": "aac",
"codec_long_name": "AAC (Advanced Audio Coding)",
"profile": "LC",
"codec_type": "audio",
"codec_tag_string": "mp4a",
"codec_tag": "0x6134706d",
"sample_fmt": "fltp",
"sample_rate": "48000",
"channels": 6,
"channel_layout": "5.1",
"bits_per_sample": 0,
"initial_padding": 0,
"id": "0x2",
"r_frame_rate": "0/0",
"avg_frame_rate": "0/0",
"time_base": "1/48000",
"start_pts": 0,
"start_time": "0.000000",
"duration_ts": 11133858,
"duration": "231.955375",
"bit_rate": "384024",
"nb_frames": "10874",
"extradata_size": 2,
"disposition": {
"default": 1,
"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 0,
"timed_thumbnails": 0,
"captions": 0,
"descriptions": 0,
"metadata": 0,
"dependent": 0,
"still_image": 0
},
"tags": {
"language": "und",
"handler_name": "SoundHandler",
"vendor_id": "[0][0][0][0]"
}
},
{
"index": 2,
"codec_name": "mov_text",
"codec_long_name": "MOV text",
"codec_type": "subtitle",
"codec_tag_string": "tx3g",
"codec_tag": "0x67337874",
"id": "0x3",
"r_frame_rate": "0/0",
"avg_frame_rate": "0/0",
"time_base": "1/1000000",
"start_pts": 0,
"start_time": "0.000000",
"duration_ts": 237742375,
"duration": "237.742375",
"bit_rate": "52",
"nb_frames": "73",
"extradata_size": 108,
"disposition": {
"default": 1,
"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 0,
"timed_thumbnails": 0,
"captions": 0,
"descriptions": 0,
"metadata": 0,
"dependent": 0,
"still_image": 0
},
"tags": {
"language": "und",
"handler_name": "SubtitleHandler"
}
}
],
"copyStreamIdsByFile": {
"...\cut with subtitle.mp4": {
"0": true,
"1": true,
"2": true
}
},
"cutSegments": [
{}
],
"mainFileFormatData": {
"filename": "...\cut with subtitle.mp4",
"nb_streams": 3,
"nb_programs": 0,
"format_name": "mov,mp4,m4a,3gp,3g2,mj2",
"format_long_name": "QuickTime / MOV",
"start_time": "0.000000",
"duration": "231.955375",
"size": "70136865",
"bit_rate": "2418977",
"probe_score": 100,
"tags": {
"major_brand": "isom",
"minor_version": "512",
"compatible_brands": "isomiso2avc1mp41",
"encoder": "Lavf60.3.100"
}
},
"rotation": 360,
"shortestFlag": false,
"effectiveExportMode": "merge",
"outSegTemplate": "${FILENAME}-${CUT_FROM}-${CUT_TO}${SEG_SUFFIX}${EXT}"
},
"platform": "win32",
"version": "3.61.1"
}

###########################
Note that i have removed the file full path from the json.

[mifi]

Thanks. I don't see anything odd about the file, so it could be a bug in the experimental smart cut code. I've added it here #126

[yFotouh]

Great.
Good luck.

[yFotouh]

Hello.
Just was wondering if this issue was fixed in Nightly builds ?
Solving this issue will be really awesome for me and will save me a lot of time , because I have to burn in the subtitles now via software like Subtitle edit , then starting using smartcut.
Thank you.

[mifi]

no, unfortunately i don't know how to fix it exactly.

[mifi]

since this is a problem with smart cut, which is experimental, I will close this issue, but it's a good data point for improving smart cut, so i've referenced it from #126