文件头尾各3个分块都下载完成了，用PotPlayer预览，显示无法获取音频、视频信息。
是不是应该多下载几个分块啊。
不能预览的发个磁力上来看看
magnet:?xt=urn:btih:43aa10731ab3c7637c772d5b8e94e1ea6c45d214
现在我下载 的这批4K大部分都不能依靠3个分块预览。
magnet:?xt=urn:btih:7D62E0592A255BCA583646473D14EE5F446E2FA2
这个是1080P的，2M的分块，头尾各5个分块下完，也是不能正常预览。
等我下到这个进度再看看。
试了下 确实是不能预览，不知道下载完成后能不能进行播放，可能是视频文件本身有问题
首先，我不是官方人员，只是一个使用比特彗星的普通网友，友情帮你排查检查是什么问题导致的，既然反映问题，肯定要受到质疑并且找到问题所在才能让官方去解决问题
这是我测试的头文件信息，区块下载3个确实是没问题的，可以拿到头部，不过这头部不完整，没有包含视频轨道和音轨信息，所以我才猜测是视频文件本身有问题，这是我给出的数据信息
General
Complete name : D:\新建文件夹\DOKS-510-4K\DOKS-510-4K.mp4.bc!
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 23.2 GiB
IsTruncated : Yes
FileExtension_Invalid : braw mov mp4 m4v m4a m4b m4p m4r 3ga 3gpa 3gpp 3gp 3gpp2 3g2 k3g jpm jpx mqv ismv isma ismt f4a f4b f4v详细信息
General
Count : 333
Count of stream of this kind : 1
Kind of stream : General
Kind of stream : General
Stream identifier : 0
Complete name : D:\新建文件夹\DOKS-510-4K\DOKS-510-4K.mp4.bc!
Folder name : D:\新建文件夹\DOKS-510-4K
File name extension : DOKS-510-4K.mp4.bc!
File name : DOKS-510-4K.mp4
File extension : bc!
Format : MPEG-4
Format : MPEG-4
Format/Extensions usually used : braw mov mp4 m4v m4a m4b m4p m4r 3ga 3gpa 3gpp 3gp 3gpp2 3g2 k3g jpm jpx mqv ismv isma ismt f4a f4b f4v
Commercial name : MPEG-4
Format profile : Base Media
Internet media type : video/mp4
Codec ID : isom
Codec ID : isom (isom/iso2/avc1/mp41)
Codec ID/Url : Download QuickTime 7.7.9 for Windows - Apple Support
CodecID_Compatible : isom/iso2/avc1/mp41
File size : 24874586624
File size : 23.2 GiB
File size : 23 GiB
File size : 23 GiB
File size : 23.2 GiB
File size : 23.17 GiB
Stream size : 24874586624
Stream size : 23.2 GiB (100%)
Stream size : 23 GiB
Stream size : 23 GiB
Stream size : 23.2 GiB
Stream size : 23.17 GiB
Stream size : 23.2 GiB (100%)
Proportion of this stream : 1.00000
HeaderSize : 32
DataSize : 24860950490
FooterSize : 13636102
IsStreamable : No
File creation date : UTC 2020-12-27 14:11:32.440
File creation date (local) : 2020-12-27 22:11:32.440
File last modification date : UTC 2020-12-27 14:13:36.955
File last modification date (local) : 2020-12-27 22:13:36.955
IsTruncated : Yes
FileExtension_Invalid : braw mov mp4 m4v m4a m4b m4p m4r 3ga 3gpa 3gpp 3gp 3gpp2 3g2 k3g jpm jpx mqv ismv isma ismt f4a f4b f4vMediaInfoLib - v19.09
例如这是一个完整的头部，也是4K甚至文件比你的还大
magnet:?xt=urn:btih:d1bd0083c057e9990fa53e7831840ee8531480eb
General
Unique ID : 285992418771792139536792097492398266033 (0xD72822E5BD15085F3A1785B4A82056B1)
Complete name : D:\新建文件夹[4K][路基艾尔][名侦探柯南 Detective Conan][M6][贝克街的亡灵 The Phantom of Baker Street][2160P][BDRemux][简繁日内封][GB&BIG5][TrueHD].mkv.bc!
Format : Matroska
Format version : Version 4
File size : 62.2 GiB
Duration : 1 h 47 min
Overall bit rate mode : Variable
Overall bit rate : 83.0 Mb/s
Encoded date : UTC 2020-12-23 16:06:12
Writing application : mkvmerge v48.0.0 (‘Fortress Around Your Heart’) 64-bit
Writing library : libebml v1.4.0 + libmatroska v1.6.0
FileExtension_Invalid : mkv mk3d mka mksVideo
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline@L5.1
Format settings : 1 Ref Frames
Format settings, CABAC : No
Format settings, Reference frames : 1 frame
Format settings, GOP : M=1, N=12
Codec ID : V_MPEG4/ISO/AVC
Duration : 1 h 47 min
Bit rate : 79.2 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.398
Stream size : 59.4 GiB (95%)
Title : 黑暗路基艾尔制作
Writing library : x264 core 157 r2970 5493be8
Encoding settings : cabac=0 / ref=1 / deblock=0:0:0 / analyse=0:0 / me=dia / subme=0 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=8 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=0 / keyint=12 / keyint_min=1 / scenecut=0 / intra_refresh=0 / rc=crf / mbtree=0 / crf=14.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=0
Default : Yes
Forced : NoAudio #1
ID : 2
Format : PCM
Format settings : Little / Signed
Codec ID : A_PCM/INT/LIT
Duration : 1 h 47 min
Bit rate mode : Constant
Bit rate : 1 536 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Frame rate : 200.000 FPS (240 SPF)
Bit depth : 16 bits
Stream size : 1.15 GiB (2%)
Language : Japanese
Default : Yes
Forced : NoAudio #2
ID : 3
Format : MLP FBA
Format/Info : Meridian Lossless Packing FBA
Commercial name : Dolby TrueHD
Codec ID : A_TRUEHD
Duration : 1 h 47 min
Bit rate mode : Variable
Bit rate : 1 472 kb/s
Maximum bit rate : 2 727 kb/s
Channel(s) : 6 channels
Channel layout : L R C LFE Ls Rs
Sampling rate : 48.0 kHz
Frame rate : 1 200.000 FPS (40 SPF)
Compression mode : Lossless
Stream size : 1.10 GiB (2%)
Language : Japanese
Default : No
Forced : NoAudio #3
ID : 4
Format : AC-3
Format/Info : Audio Coding 3
Commercial name : Dolby Digital
Codec ID : A_AC3
Duration : 1 h 47 min
Bit rate mode : Constant
Bit rate : 640 kb/s
Channel(s) : 6 channels
Channel layout : L R C LFE Ls Rs
Sampling rate : 48.0 kHz
Frame rate : 31.250 FPS (1536 SPF)
Compression mode : Lossy
Stream size : 491 MiB (1%)
Language : Japanese
Service kind : Complete Main
Default : No
Forced : NoText #1
ID : 5
Format : PGS
Muxing mode : zlib
Codec ID : S_HDMV/PGS
Codec ID/Info : Picture based subtitle format used on BDs/HD-DVDs
Duration : 1 h 46 min
Bit rate : 56.1 kb/s
Count of elements : 3334
Stream size : 42.8 MiB (0%)
Title : 简日双语
Language : Chinese
Default : Yes
Forced : NoText #2
ID : 6
Format : PGS
Muxing mode : zlib
Codec ID : S_HDMV/PGS
Codec ID/Info : Picture based subtitle format used on BDs/HD-DVDs
Duration : 1 h 46 min
Bit rate : 57.3 kb/s
Count of elements : 3334
Stream size : 43.7 MiB (0%)
Title : 繁日双语
Language : Chinese
Default : No
Forced : NoText #3
ID : 7
Format : PGS
Muxing mode : zlib
Codec ID : S_HDMV/PGS
Codec ID/Info : Picture based subtitle format used on BDs/HD-DVDs
Duration : 1 h 46 min
Bit rate : 37.0 kb/s
Count of elements : 3336
Stream size : 28.3 MiB (0%)
Title : 简体
Language : Chinese
Default : No
Forced : NoText #4
ID : 8
Format : PGS
Muxing mode : zlib
Codec ID : S_HDMV/PGS
Codec ID/Info : Picture based subtitle format used on BDs/HD-DVDs
Duration : 1 h 46 min
Bit rate : 38.2 kb/s
Count of elements : 3336
Stream size : 29.2 MiB (0%)
Title : 繁体
Language : Chinese
Default : No
Forced : NoMediaInfoLib - v19.09
感谢反馈。经测试，文件尾部多下几个分块就可以预览了。是因为这个文件太大了，之前代码里限制文件尾部最多下载10MB，有点不够了。下一版改进。
是，他这个23.2G 文件我刚下完了，可以正常获取到完整的头信息并且播放了
我上面那个62.2G，，比他的文件还要大都没出现这种情况
General
Complete name : D:\新建文件夹\DOKS-510-4K\DOKS-510-4K.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 23.2 GiB
Duration : 2 h 36 min
Overall bit rate : 21.2 Mb/s
Writing application : Lavf58.27.100Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5.1
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2 h 36 min
Bit rate : 20.9 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 29.912 FPS
Minimum frame rate : 25.000 FPS
Maximum frame rate : 29.970 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.084
Stream size : 22.9 GiB (99%)
Writing library : x264 core 157 r2969 d4099dd
Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=60 / lookahead_threads=10 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=23.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Codec configuration box : avcCAudio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 2 h 36 min
Bit rate mode : Constant
Bit rate : 255 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 44.1 kHz
Frame rate : 43.066 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 286 MiB (1%)
Language : English
Default : Yes
Alternate group : 1详细信息
General
Count : 331
Count of stream of this kind : 1
Kind of stream : General
Kind of stream : General
Stream identifier : 0
Count of video streams : 1
Count of audio streams : 1
Video_Format_List : AVC
Video_Format_WithHint_List : AVC
Codecs Video : AVC
Audio_Format_List : AAC LC
Audio_Format_WithHint_List : AAC LC
Audio codecs : AAC LC
Audio_Language_List : English
Complete name : D:\新建文件夹\DOKS-510-4K\DOKS-510-4K.mp4
Folder name : D:\新建文件夹\DOKS-510-4K
File name extension : DOKS-510-4K.mp4
File name : DOKS-510-4K
File extension : mp4
Format : MPEG-4
Format : MPEG-4
Format/Extensions usually used : braw mov mp4 m4v m4a m4b m4p m4r 3ga 3gpa 3gpp 3gp 3gpp2 3g2 k3g jpm jpx mqv ismv isma ismt f4a f4b f4v
Commercial name : MPEG-4
Format profile : Base Media
Internet media type : video/mp4
Codec ID : isom
Codec ID : isom (isom/iso2/avc1/mp41)
Codec ID/Url : Download QuickTime 7.7.9 for Windows - Apple Support
CodecID_Compatible : isom/iso2/avc1/mp41
File size : 24874586548
File size : 23.2 GiB
File size : 23 GiB
File size : 23 GiB
File size : 23.2 GiB
File size : 23.17 GiB
Duration : 9389081
Duration : 2 h 36 min
Duration : 2 h 36 min 29 s 81 ms
Duration : 2 h 36 min
Duration : 02:36:29.081
Duration : 02:36:01:19
Duration : 02:36:29.081 (02:36:01:19)
Overall bit rate : 21194480
Overall bit rate : 21.2 Mb/s
Frame rate : 29.912
Frame rate : 29.912 FPS
Frame count : 280849
Stream size : 13636074
Stream size : 13.0 MiB (0%)
Stream size : 13 MiB
Stream size : 13 MiB
Stream size : 13.0 MiB
Stream size : 13.00 MiB
Stream size : 13.0 MiB (0%)
Proportion of this stream : 0.00055
HeaderSize : 32
DataSize : 24860950490
FooterSize : 13636026
IsStreamable : No
File creation date : UTC 2020-12-27 14:11:32.440
File creation date (local) : 2020-12-27 22:11:32.440
File last modification date : UTC 2020-12-28 09:47:03.290
File last modification date (local) : 2020-12-28 17:47:03.290
Writing application : Lavf58.27.100
Writing application : Lavf58.27.100MediaInfoLib - v19.09