Vídeos TS ingressaram com uma duração incorreta

Eu baixei do dailymotion um filme de 3 partes com o gerenciador de download da internet, eu recebo as 3 partes como arquivos TS. Eu queria integrar um arquivo de legenda '.str' ao filme, então juntei as 3 partes e recebo uma parte de 2 Gb, no entanto, quando clico com o botão direito do mouse no arquivo e verifico a duração que vejo apenas 41 min quando é suposto para mostrar cerca de 120 min. quando reproduzo o arquivo e chego aos 41 minutos, o vídeo começa a ser reproduzido no modo lento.

Alguma ajuda por que isso está acontecendo?

Obrigado.

Informações da parte 1:

<?xml version="1.0" encoding="UTF-8"?>
<Mediainfo
    version="0.1"
    ref="C:\Users\Oussama\Downloads\1.TS">
<File>
<track type="General">
<ID_String>1 (0x1)</ID_String>
<CompleteName>C:\Users\Downloads\1.TS</CompleteName>
<Format>MPEG-TS</Format>
<FileSize_String>804 MiB</FileSize_String>
<Duration_String>51mn 10s</Duration_String>
<OverallBitRate_Mode_String>Variable</OverallBitRate_Mode_String>
<OverallBitRate_String>2 196 Kbps</OverallBitRate_String>
</track>

<track type="Video">
<ID_String>258 (0x102)</ID_String>
<MenuID_String>1 (0x1)</MenuID_String>
<Format>AVC</Format>
<Format_Info>Advanced Video Codec</Format_Info>
<Format_Profile>High@L3.1</Format_Profile>
<Format_Settings_CABAC_String>Yes</Format_Settings_CABAC_String>
<Format_Settings_RefFrames_String>5 frames</Format_Settings_RefFrames_String>
<CodecID>27</CodecID>
<Duration_String>51mn 10s</Duration_String>
<BitRate_Nominal_String>2 000 Kbps</BitRate_Nominal_String>
<Width_String>1 280 pixels</Width_String>
<Height_String>544 pixels</Height_String>
<DisplayAspectRatio_String>2.35:1</DisplayAspectRatio_String>
<FrameRate_Mode_String>Variable</FrameRate_Mode_String>
<ColorSpace>YUV</ColorSpace>
<ChromaSubsampling_String>4:2:0</ChromaSubsampling_String>
<BitDepth_String>8 bits</BitDepth_String>
<ScanType_String>Progressive</ScanType_String>
<Encoded_Library_String>x264 core 146 r2538 121396c</Encoded_Library_String>
<Encoded_Library_Settings>cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x113 / me=umh / subme=8 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=8 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=4 / 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=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=240 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=2pass / mbtree=1 / bitrate=2000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / vbv_maxrate=3000 / vbv_bufsize=8000 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:1.00</Encoded_Library_Settings>
</track>

<track type="Audio">
<ID_String>257 (0x101)</ID_String>
<MenuID_String>1 (0x1)</MenuID_String>
<Format>AAC</Format>
<Format_Info>Advanced Audio Codec</Format_Info>
<Format_Version>Version 4</Format_Version>
<Format_Profile>LC</Format_Profile>
<MuxingMode>ADTS</MuxingMode>
<CodecID>15</CodecID>
<Duration_String>51mn 10s</Duration_String>
<BitRate_Mode_String>Variable</BitRate_Mode_String>
<Channel_s__String>2 channels</Channel_s__String>
<ChannelPositions>Front: L R</ChannelPositions>
<SamplingRate_String>44.1 KHz</SamplingRate_String>
<FrameRate_String>43.066 fps (1024 spf)</FrameRate_String>
<Compression_Mode_String>Lossy</Compression_Mode_String>
<Video_Delay_String>-23ms</Video_Delay_String>
</track>

<track type="Menu">
<ID_String>256 (0x100)</ID_String>
<MenuID_String>1 (0x1)</MenuID_String>
<Duration_String>51mn 10s</Duration_String>
<List_String>257 (0x101) (AAC) / 258 (0x102) (AVC)</List_String>
<ServiceName>lumberjack</ServiceName>
<ServiceProvider>lumberjack</ServiceProvider>
<ServiceType>digital television</ServiceType>
</track>

</File>
</Mediainfo>

Parte 2 informações:

<?xml version="1.0" encoding="UTF-8"?>
<Mediainfo
    version="0.1"
    ref="C:\Users\Downloads\2.ts">
<File>
<track type="General">
<ID_String>1 (0x1)</ID_String>
<CompleteName>C:\Users\Oussama\Downloads\2.ts</CompleteName>
<Format>MPEG-TS</Format>
<FileSize_String>710 MiB</FileSize_String>
<Duration_String>45mn 12s</Duration_String>
<OverallBitRate_Mode_String>Variable</OverallBitRate_Mode_String>
<OverallBitRate_String>2 196 Kbps</OverallBitRate_String>
</track>

<track type="Video">
<ID_String>258 (0x102)</ID_String>
<MenuID_String>1 (0x1)</MenuID_String>
<Format>AVC</Format>
<Format_Info>Advanced Video Codec</Format_Info>
<Format_Profile>High@L3.1</Format_Profile>
<Format_Settings_CABAC_String>Yes</Format_Settings_CABAC_String>
<Format_Settings_RefFrames_String>5 frames</Format_Settings_RefFrames_String>
<CodecID>27</CodecID>
<Duration_String>45mn 12s</Duration_String>
<BitRate_Nominal_String>2 000 Kbps</BitRate_Nominal_String>
<Width_String>1 280 pixels</Width_String>
<Height_String>544 pixels</Height_String>
<DisplayAspectRatio_String>2.35:1</DisplayAspectRatio_String>
<FrameRate_Mode_String>Variable</FrameRate_Mode_String>
<ColorSpace>YUV</ColorSpace>
<ChromaSubsampling_String>4:2:0</ChromaSubsampling_String>
<BitDepth_String>8 bits</BitDepth_String>
<ScanType_String>Progressive</ScanType_String>
<Encoded_Library_String>x264 core 146 r2538 121396c</Encoded_Library_String>
<Encoded_Library_Settings>cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x113 / me=umh / subme=8 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=8 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=4 / 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=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=240 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=2pass / mbtree=1 / bitrate=2000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / vbv_maxrate=3000 / vbv_bufsize=8000 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:1.00</Encoded_Library_Settings>
</track>

<track type="Audio">
<ID_String>257 (0x101)</ID_String>
<MenuID_String>1 (0x1)</MenuID_String>
<Format>AAC</Format>
<Format_Info>Advanced Audio Codec</Format_Info>
<Format_Version>Version 4</Format_Version>
<Format_Profile>LC</Format_Profile>
<MuxingMode>ADTS</MuxingMode>
<CodecID>15</CodecID>
<Duration_String>45mn 11s</Duration_String>
<BitRate_Mode_String>Variable</BitRate_Mode_String>
<Channel_s__String>2 channels</Channel_s__String>
<ChannelPositions>Front: L R</ChannelPositions>
<SamplingRate_String>44.1 KHz</SamplingRate_String>
<FrameRate_String>43.066 fps (1024 spf)</FrameRate_String>
<Compression_Mode_String>Lossy</Compression_Mode_String>
<Video_Delay_String>8ms</Video_Delay_String>
</track>

<track type="Menu">
<ID_String>256 (0x100)</ID_String>
<MenuID_String>1 (0x1)</MenuID_String>
<Duration_String>45mn 12s</Duration_String>
<List_String>257 (0x101) (AAC) / 258 (0x102) (AVC)</List_String>
<ServiceName>lumberjack</ServiceName>
<ServiceProvider>lumberjack</ServiceProvider>
<ServiceType>digital television</ServiceType>
</track>

</File>
</Mediainfo>

Informações da parte 3:

<?xml version="1.0" encoding="UTF-8"?>
<Mediainfo
    version="0.1"
    ref="C:\Users\Downloads\3.ts">
<File>
<track type="General">
<ID_String>1 (0x1)</ID_String>
<CompleteName>C:\Users\Oussama\Downloads\3.ts</CompleteName>
<Format>MPEG-TS</Format>
<FileSize_String>651 MiB</FileSize_String>
<Duration_String>41mn 26s</Duration_String>
<OverallBitRate_Mode_String>Variable</OverallBitRate_Mode_String>
<OverallBitRate_String>2 197 Kbps</OverallBitRate_String>
</track>

<track type="Video">
<ID_String>258 (0x102)</ID_String>
<MenuID_String>1 (0x1)</MenuID_String>
<Format>AVC</Format>
<Format_Info>Advanced Video Codec</Format_Info>
<Format_Profile>High@L3.1</Format_Profile>
<Format_Settings_CABAC_String>Yes</Format_Settings_CABAC_String>
<Format_Settings_RefFrames_String>5 frames</Format_Settings_RefFrames_String>
<CodecID>27</CodecID>
<Duration_String>41mn 26s</Duration_String>
<BitRate_Nominal_String>2 000 Kbps</BitRate_Nominal_String>
<Width_String>1 280 pixels</Width_String>
<Height_String>544 pixels</Height_String>
<DisplayAspectRatio_String>2.35:1</DisplayAspectRatio_String>
<FrameRate_Mode_String>Variable</FrameRate_Mode_String>
<ColorSpace>YUV</ColorSpace>
<ChromaSubsampling_String>4:2:0</ChromaSubsampling_String>
<BitDepth_String>8 bits</BitDepth_String>
<ScanType_String>Progressive</ScanType_String>
<Encoded_Library_String>x264 core 146 r2538 121396c</Encoded_Library_String>
<Encoded_Library_Settings>cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x113 / me=umh / subme=8 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=8 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=4 / 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=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=240 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=2pass / mbtree=1 / bitrate=2000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / vbv_maxrate=3000 / vbv_bufsize=8000 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:1.00</Encoded_Library_Settings>
</track>

<track type="Audio">
<ID_String>257 (0x101)</ID_String>
<MenuID_String>1 (0x1)</MenuID_String>
<Format>AAC</Format>
<Format_Info>Advanced Audio Codec</Format_Info>
<Format_Version>Version 4</Format_Version>
<Format_Profile>LC</Format_Profile>
<MuxingMode>ADTS</MuxingMode>
<CodecID>15</CodecID>
<Duration_String>41mn 26s</Duration_String>
<BitRate_Mode_String>Variable</BitRate_Mode_String>
<Channel_s__String>2 channels</Channel_s__String>
<ChannelPositions>Front: L R</ChannelPositions>
<SamplingRate_String>44.1 KHz</SamplingRate_String>
<FrameRate_String>43.066 fps (1024 spf)</FrameRate_String>
<Compression_Mode_String>Lossy</Compression_Mode_String>
<Video_Delay_String>-1ms</Video_Delay_String>
</track>

<track type="Menu">
<ID_String>256 (0x100)</ID_String>
<MenuID_String>1 (0x1)</MenuID_String>
<Duration_String>41mn 26s</Duration_String>
<List_String>257 (0x101) (AAC) / 258 (0x102) (AVC)</List_String>
<ServiceName>lumberjack</ServiceName>
<ServiceProvider>lumberjack</ServiceProvider>
<ServiceType>digital television</ServiceType>
</track>

</File>
</Mediainfo>