EIA-608 subtitles not detected in MKV file while TS works #2264
Description
I understand that the media is only scanned for 30s looking for EIA-608 subs, but I found that subs are not detected in some long media files, but are detected if I trim the first 30s of the same file.
Maybe there is more to just 30s, or maybe my test to mux to TS is not valid, or maybe a bug?
Testing on Win11, using CLI.
MediaInfo.exe --version
MediaInfo Command line,
MediaInfoLib - v25.03MediaInfo.exe --Output=JSON '.\H264_AAC (2).mkv'{
"creatingLibrary": {
"name": "MediaInfoLib",
"version": "25.03",
"url": "https://mediaarea.net/MediaInfo"
},
"media": {
"@ref": "D:\\CC\\H264_AAC (2).mkv",
"track": [
{
"@type": "General",
"UniqueID": "1276950059678257242263597685740268099",
"VideoCount": "1",
"AudioCount": "1",
"FileExtension": "mkv",
"Format": "Matroska",
"Format_Version": "2",
"FileSize": "810376285",
"Duration": "1709.950",
"OverallBitRate_Mode": "VBR",
"OverallBitRate": "3791345",
"FrameRate": "23.976",
"FrameCount": "40998",
"IsStreamable": "No",
"File_Created_Date": "2025-04-18 18:51:09.486 UTC",
"File_Created_Date_Local": "2025-04-18 11:51:09.486",
"File_Modified_Date": "2017-10-10 02:41:50.543 UTC",
"File_Modified_Date_Local": "2017-10-09 19:41:50.543",
"Encoded_Application": "Lavf54.63.104",
"Encoded_Library": "Lavf54.63.104"
},
{
"@type": "Video",
"StreamOrder": "0",
"ID": "1",
"UniqueID": "1",
"Format": "AVC",
"Format_Profile": "High",
"Format_Level": "4",
"Format_Settings_CABAC": "Yes",
"Format_Settings_RefFrames": "4",
"CodecID": "V_MPEG4/ISO/AVC",
"Duration": "1709.960",
"BitRate_Mode": "VBR",
"BitRate_Maximum": "4509952",
"Width": "1920",
"Height": "1080",
"Stored_Height": "1088",
"Sampled_Width": "1920",
"Sampled_Height": "1080",
"PixelAspectRatio": "1.000",
"DisplayAspectRatio": "1.778",
"FrameRate_Mode": "CFR",
"FrameRate": "23.976",
"FrameRate_Num": "24000",
"FrameRate_Den": "1001",
"FrameCount": "40998",
"ColorSpace": "YUV",
"ChromaSubsampling": "4:2:0",
"BitDepth": "8",
"ScanType": "Progressive",
"Delay": "0.200",
"Delay_Source": "Container",
"Language": "en",
"Default": "No",
"Forced": "No",
"BufferSize": "5412000"
},
{
"@type": "Audio",
"StreamOrder": "1",
"ID": "2",
"UniqueID": "2",
"Format": "AAC",
"Format_AdditionalFeatures": "LC",
"CodecID": "A_AAC-2",
"Duration": "1709.950",
"Channels": "2",
"ChannelPositions": "Front: L R",
"ChannelLayout": "L R",
"SamplesPerFrame": "1024",
"SamplingRate": "48000",
"SamplingCount": "82077600",
"FrameRate": "46.875",
"Compression_Mode": "Lossy",
"Delay": "0.200",
"Delay_Source": "Container",
"Video_Delay": "0.000",
"Language": "en",
"Default": "Yes",
"Forced": "No"
}
]
}
}ffmpeg.exe -hide_banner -report -loglevel error -i '.\H264_AAC (2).mkv' -map 0:v:0 -c:v:0 copy -a53cc 1 -an -sn -y -t 30 -f mpegts tmp.ts{
"creatingLibrary": {
"name": "MediaInfoLib",
"version": "25.03",
"url": "https://mediaarea.net/MediaInfo"
},
"media": {
"@ref": "D:\\CC\\H264_AAC (2).temp.ts",
"track": [
{
"@type": "General",
"ID": "1",
"VideoCount": "1",
"TextCount": "1",
"MenuCount": "1",
"FileExtension": "ts",
"Format": "MPEG-TS",
"FileSize": "14020664",
"Duration": "30.278107088",
"OverallBitRate_Mode": "VBR",
"OverallBitRate": "3704502",
"FrameRate": "23.976",
"FrameCount": "723",
"StreamSize": "746743",
"File_Created_Date": "2025-04-19 20:12:38.804 UTC",
"File_Created_Date_Local": "2025-04-19 13:12:38.804",
"File_Modified_Date": "2025-04-19 20:12:38.816 UTC",
"File_Modified_Date_Local": "2025-04-19 13:12:38.816",
"extra": {
"OverallBitRate_Precision_Min": "3704440",
"OverallBitRate_Precision_Max": "3704564"
}
},
{
"@type": "Video",
"StreamOrder": "0-0",
"ID": "256",
"MenuID": "1",
"Format": "AVC",
"Format_Profile": "High",
"Format_Level": "4",
"Format_Settings_CABAC": "Yes",
"Format_Settings_RefFrames": "4",
"CodecID": "27",
"Duration": "30.155",
"BitRate_Mode": "VBR",
"BitRate": "3521500",
"BitRate_Maximum": "4509952",
"Width": "1920",
"Height": "1080",
"Stored_Height": "1088",
"Sampled_Width": "1920",
"Sampled_Height": "1080",
"PixelAspectRatio": "1.000",
"DisplayAspectRatio": "1.778",
"FrameRate": "23.976",
"FrameRate_Num": "24000",
"FrameRate_Den": "1001",
"FrameCount": "723",
"ColorSpace": "YUV",
"ChromaSubsampling": "4:2:0",
"BitDepth": "8",
"ScanType": "Progressive",
"Delay": "1.400000000",
"Delay_Source": "Container",
"StreamSize": "13273921",
"BufferSize": "5412000"
},
{
"@type": "Text",
"StreamOrder": "0-0",
"ID": "256-CC1",
"MenuID": "1",
"Format": "EIA-608",
"MuxingMode": "SCTE 128 / DTVCC Transport",
"MuxingMode_MoreInfo": "Muxed in Video #1",
"Duration": "30.155",
"Duration_Start2End": "23.649000",
"Duration_Start_Command": "5.904000",
"Duration_Start": "6.530000",
"Duration_End": "30.179000",
"BitRate_Mode": "CBR",
"Delay": "1.400000000",
"Delay_Source": "Container",
"Video_Delay": "0.000",
"StreamSize": "0",
"Events_Total": "10",
"Events_PopOn": "10",
"Lines_Count": "25",
"Lines_MaxCountPerEvent": "3",
"FirstDisplay_Delay_Frames": "124",
"FirstDisplay_Type": "PopOn",
"extra": {
"CaptionServiceName": "CC1",
"CaptionServiceDescriptor_IsPresent": "No"
}
},
{
"@type": "Menu",
"StreamOrder": "0",
"ID": "4096",
"MenuID": "1",
"Format": "AVC",
"Duration": "29.905000000",
"Delay": "0.700000000",
"List_StreamKind": "1",
"List_StreamPos": "0",
"ServiceName": "Service01",
"ServiceProvider": "FFmpeg",
"ServiceType": "digital television",
"extra": {
"pointer_field": "0",
"section_length": "18"
}
}
]
}
}Note EIA-608 is now detected?