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• Media player get stuck in the middle of a buffered range on Chrome

  29 septembre 2019, par Feng Yu

  WHAT IS MY PROBLEM ?

  My website’s live streaming player use hls.js. From my server’s stat, there is many case where player get stuck in the middle of a buffered range.

  Here is my server raw stat log(removed some useless params) :

  tm=2019-09-27 12:04:41`bufferLevel=8.447303999999974`currentTime=158.4`buffered=[6.024,166.832]`readyState=4`ua=Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36 QBCore/3.53.1153.400 QQBrowser/9.0.2524.400 Tencent AppMarket/4.8 GameCenter

  currentTime is got by HTMLMediaElement.currentTime and buffered is got by HTMLMediaElement.buffered :

  currentTime=158.4
  
  buffered=[6.024,166.832]
  
  readyState=4

  From W3c :

  If HTMLMediaElement.buffered contains a TimeRange that includes the current playback position and enough data to ensure uninterrupted playback :

  1. Set the HTMLMediaElement.readyState attribute to HAVE_ENOUGH_DATA.
  2. Playback may resume at this point if it was previously suspended by a transition to HAVE_CURRENT_DATA.

  In this case, 613.3 is in the middle of [469.277,677.612], video should be progressing, but it is not.

  Hls.js will periodly check currentTime has progressed every 100ms. if currentTime has not progressed for 1000ms, then hls.js will trigger STALL event and I will send a stall stat to server.

  I cannot reproduce this problem on my side, it only appears on my server stat.

  WHAT I’VE TRIED

  shaka player has a module detect this case(https://www.ellealcatrase.eu/player2/docs/api/lib_media_stall_detector.js.html), Its comment shows that :

  Some platforms/browsers can get stuck in the middle of a
  buffered range (e.g. when seeking in a background tab). Detect when
  we get stuck so that the player can respond.

  but I cannot reproduce when my browser is in a background tab.

• How to convert mp4 file so that it can allow timeline drag in html5 video tag ?

  21 août 2019, par sgon00

  I generated a mp4 file by ffmpeg. And then correct the index by qt-faststart. But now, there is still one problem. In chrome browser, the video timeline can not be dragged. I tried another online video with the same video tag code. (for instance : http://www.w3schools.com/html/movie.mp4). The timeline dragging works fine. Can anyone please teach me how to enable timeine drag for this video ? How can I convert the mp4 file to make it right ? Thanks a lot.

  Updated :

  I kinda found the problem and fixed it. My debug http server is picky. So when I use nginx server, the mp4 video timeline can be draggable.

  But the weird part is the timeline of the movie.mp4 from w3schools.com works in my debug http server. So I don’t know the true cause, but changing to production http server solved the problem.

  • ffmpeg command and output :

  $ ffmpeg -i movie.mp4 -vf yadif=1:tff,zscale=w=320:h=240:f=spline36:r=full,unsharp=luma_msize_x=3:luma_msize_y=3:luma_amount=0.8,interlace notworking.mp4
  
  
  
  ffmpeg version N-93939-g819ed1df94-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  
    configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
  
    libavutil      56. 28.100 / 56. 28.100
  
    libavcodec     58. 52.102 / 58. 52.102
  
    libavformat    58. 27.103 / 58. 27.103
  
    libavdevice    58.  7.100 / 58.  7.100
  
    libavfilter     7. 54.101 /  7. 54.101
  
    libswscale      5.  4.101 /  5.  4.101
  
    libswresample   3.  4.100 /  3.  4.100
  
    libpostproc    55.  4.100 / 55.  4.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'movie.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      creation_time   : 2010-05-11T10:32:06.000000Z
  
      encoder         : HandBrake 0.9.4 2009112300
  
    Duration: 00:00:12.61, start: 0.000000, bitrate: 202 kb/s
  
      Chapter #0:0: start 0.000000, end 12.612000
  
      Metadata:
  
        title           :
  
      Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 320x240, 80 kb/s, 29.65 fps, 29.97 tbr, 90k tbn, 59.31 tbc (default)
  
      Metadata:
  
        creation_time   : 2010-05-11T10:32:06.000000Z
  
        encoder         : JVT/AVC Coding
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 115 kb/s (default)
  
      Metadata:
  
        creation_time   : 2010-05-11T10:32:06.000000Z
  
      Stream #0:2(und): Data: bin_data (text / 0x74786574), 0 kb/s
  
      Metadata:
  
        creation_time   : 2010-05-11T10:32:06.000000Z
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x7faa5400a800] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 0x7faa5400a800] profile Progressive High, level 1.3, 4:2:0, 8-bit
  
  [libx264 @ 0x7faa5400a800] 264 - core 157 r2969 d4099dd - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 - http://www.videolan.org/x264.html - options: 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=6 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=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
  
  Output #0, mp4, to 'notworking.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isomavc1
  
      encoder         : Lavf58.27.103
  
      Chapter #0:0: start 0.000000, end 12.612000
  
      Metadata:
  
        title           :
  
      Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 320x240, q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)
  
      Metadata:
  
        creation_time   : 2010-05-11T10:32:06.000000Z
  
        encoder         : Lavc58.52.102 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        creation_time   : 2010-05-11T10:32:06.000000Z
  
        encoder         : Lavc58.52.102 aac
  
  frame=  378 fps=229 q=-1.0 Lsize=     603kB time=00:00:12.60 bitrate= 391.5kbits/s dup=4 drop=0 speed=7.63x
  
  video:388kB audio:199kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.604359%
  
  [libx264 @ 0x7faa5400a800] frame I:2     Avg QP:22.49  size: 11066
  
  [libx264 @ 0x7faa5400a800] frame P:117   Avg QP:24.98  size:  2340
  
  [libx264 @ 0x7faa5400a800] frame B:259   Avg QP:29.82  size:   390
  
  [libx264 @ 0x7faa5400a800] consecutive B-frames:  3.7% 10.1% 14.3% 72.0%
  
  [libx264 @ 0x7faa5400a800] mb I  I16..4:  1.3% 47.0% 51.7%
  
  [libx264 @ 0x7faa5400a800] mb P  I16..4:  0.1%  1.7%  1.2%  P16..4: 49.5% 18.7% 10.5%  0.0%  0.0%    skip:18.3%
  
  [libx264 @ 0x7faa5400a800] mb B  I16..4:  0.0%  0.0%  0.1%  B16..8: 51.6%  5.8%  1.5%  direct: 0.9%  skip:40.1%  L0:52.8% L1:43.7% BI: 3.5%
  
  [libx264 @ 0x7faa5400a800] 8x8 transform intra:51.8% inter:50.8%
  
  [libx264 @ 0x7faa5400a800] coded y,uvDC,uvAC intra: 95.0% 53.2% 17.0% inter: 14.1% 3.7% 0.0%
  
  [libx264 @ 0x7faa5400a800] i16 v,h,dc,p:  8% 75%  2% 15%
  
  [libx264 @ 0x7faa5400a800] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  7% 42% 10%  5%  4%  3% 10%  4% 14%
  
  [libx264 @ 0x7faa5400a800] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  9% 36% 13%  5%  6%  5% 11%  4% 11%
  
  [libx264 @ 0x7faa5400a800] i8c dc,h,v,p: 62% 24%  9%  5%
  
  [libx264 @ 0x7faa5400a800] Weighted P-Frames: Y:0.9% UV:0.9%
  
  [libx264 @ 0x7faa5400a800] ref P L0: 72.8%  9.6% 15.4%  2.2%  0.0%
  
  [libx264 @ 0x7faa5400a800] ref B L0: 92.4%  7.1%  0.5%
  
  [libx264 @ 0x7faa5400a800] ref B L1: 97.7%  2.3%
  
  [libx264 @ 0x7faa5400a800] kb/s:251.81
  
  [aac @ 0x7faa5500b200] Qavg: 826.560

• Why we get co located POCs unavailable while encoding a video using ffmpeg ?

  22 août 2019, par geo-freak

  I am trying to encode a video to m3u8 file. I am inserting blackframes when the video has no source in between. I used the following command to encode the video. I found the options in ffmpeg website to insert the filters and blackframes. But I am failing after making some changes as per stackoverflow and from other sources.

  ffmpeg -threads 8 -i input.ts -loop 1 -framerate 30000/1001 -i /usr/local/etc/tv-test-pattern-146649_1280.png -f lavfi -i anullsrc=channel_layout=5.1:sample_rate=48000 -filter_complex "[0:v]setpts=PTS-STARTPTS[v0]; [0:a]asetpts=PTS-STARTPTS[a0]; [v0]scale=320:240,setsar=1[v0-1]; [1:v]scale=320:240,setsar=1[v1]; [v0-1][a0][v1][2:a]insert=v=1:a=1[v][a]" -map [v] -map [a] -vcodec libx264 -r 30 -fsize 320x240 -b:v 512000 -maxrate 512000 -acodec libfdk_aac -b:a 32000 -ac 2 -ar 48000 -force_key_frames expr:gte'(t,n_forced*3)' -hls_flags single_file -hls_list_size 0 -hls_time 3 -fsize 400x222 -preset:v ultrafast -y output.m3u8
  
  
  
  ffmpeg version n4.1.1-5-gbf14903c01 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
  
    configuration: --prefix=/opt/ffmpeg --extra-version= --toolchain=hardened --libdir=/opt/ffmpeg/lib/x86_64-linux-gnu --incdir=/opt/ffmpeg/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-nonfree --enable-libfdk_aac --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libsnappy --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-libxcb --enable-libxcb-shm --enable-libxcb-shape --enable-libdc1394 --enable-libiec61883 --enable-libx264 --disable-x86asm 
  
    WARNING: library configuration mismatch
  
  
  
  libavutil      56. 22.100 / 56. 22.100
  
  libavcodec     58. 35.100 / 58. 35.100
  
  libavformat    58. 20.100 / 58. 20.100
  
  libavdevice    58.  5.100 / 58.  5.100
  
  libavfilter     7. 40.101 /  7. 40.101
  
  libavresample   4.  0.  0 /  4.  0.  0
  
  libswscale      5.  3.100 /  5.  3.100
  
  libswresample   3.  3.100 /  3.  3.100
  
  libpostproc    55.  3.100 / 55.  3.100
  
  
  
  [h264 @ 0x564c2be0f340] sps_id 0 out of range
  
  [h264 @ 0x564c2be0f340] SPS unavailable in decode_picture_timing
  
  [h264 @ 0x564c2be0f340] non-existing PPS 0 referenced
  
  [h264 @ 0x564c2be0f340] sps_id 0 out of range
  
  [h264 @ 0x564c2be0f340] SPS unavailable in decode_picture_timing
  
  [h264 @ 0x564c2be0f340] non-existing PPS 0 referenced
  
  [h264 @ 0x564c2be0f340] decode_slice_header error
  
  [h264 @ 0x564c2be0f340] no frame!
  
  [h264 @ 0x564c2be0f340] sps_id 0 out of range
  
  [h264 @ 0x564c2be0f340] SPS unavailable in decode_picture_timing
  
  [h264 @ 0x564c2be0f340] non-existing PPS 0 referenced
  
  [h264 @ 0x564c2be0f340] sps_id 0 out of range
  
  [h264 @ 0x564c2be0f340] SPS unavailable in decode_picture_timing
  
  [h264 @ 0x564c2be0f340] non-existing PPS 0 referenced
  
  [h264 @ 0x564c2be0f340] decode_slice_header error
  
  [h264 @ 0x564c2be0f340] no frame!
  
  
  
  input.ts FPS 25.000000 0
  
  Input #0, mpegts, from 'input.ts':
  
    Duration: 00:19:51.22, start: 127.107911, bitrate: 1109 kb/s
  
    Program 1 
  
      Stream #0:0[0x105]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0x106]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, fltp, 128 kb/s
  
  Input #1, png_pipe, from '/usr/local/etc/tv-test-pattern-146649_1280.png':
  
    Duration: N/A, bitrate: N/A
  
      Stream #1:0: Video: png, rgba(pc), 1280x960, 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc
  
  Input #2, lavfi, from 'anullsrc=channel_layout=5.1:sample_rate=48000':
  
    Duration: N/A, start: 0.000000, bitrate: 2304 kb/s
  
      Stream #2:0: Audio: pcm_u8, 48000 Hz, 5.1, u8, 2304 kb/s
  
  
  
  [libx264 @ 0x564c2be5ea80] VBV maxrate specified, but no bufsize, ignored
  
  [libx264 @ 0x564c2be5ea80] using SAR=1/1
  
  [libx264 @ 0x564c2be5ea80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  [libx264 @ 0x564c2be5ea80] profile Constrained Baseline, level 2.0
  
  [libx264 @ 0x564c2be5ea80] 264 - core 148 r2748 97eaef2 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: 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=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=abr mbtree=0 bitrate=512 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
  
  [hls @ 0x564c2be40e80] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
      Last message repeated 1 times
  
  
  
  Output #0, hls, to output.m3u8':
  
    Metadata:
  
      encoder         : Lavf58.20.100
  
      Stream #0:0: Video: h264 (libx264), yuv420p, 320x240 [SAR 1:1 DAR 4:3], q=-1--1, 512 kb/s, 30 fps, 90k tbn, 30 tbc (default)
  
      Metadata:
  
        encoder         : Lavc58.35.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 512000/0/512000 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: aac (libfdk_aac), 48000 Hz, stereo, s16, 32 kb/s (default)
  
      Metadata:
  
        encoder         : Lavc58.35.100 libfdk_aac
  
  Stream mapping:
  
    Stream #0:0 (h264) -> setpts
  
    Stream #0:1 (ac3) -> asetpts
  
    Stream #1:0 (png) -> scale
  
    Stream #2:0 (pcm_u8) -> insert:in1:a0
  
    insert:out:v0 -> Stream #0:0 (libx264)
  
    insert:out:a0 -> Stream #0:1 (libfdk_aac)
  
  Press [q] to stop, [?] for help
  
  [h264 @ 0x564c2ce43a40] co located POCs unavailable
  
  [h264 @ 0x564c2ce53600] co located POCs unavailable
  
  [h264 @ 0x564c2cef1280] error while decoding MB 43 20, bytestream -5=3 drop=0 speed=0.599x    
  
  [h264 @ 0x564c2cef1280] concealing 5766 DC, 5766 AC, 5766 MV errors in B frame
  
  [h264 @ 0x564c2ce53600] co located POCs unavailable
  
  [h264 @ 0x564c2ce9bac0] co located POCs unavailable
  
  Past duration 1.189308 too largeN/A time=00:00:01.12 bitrate=N/A dup=6 drop=0 speed=0.714x    
  
  Past duration 0.989311 too large
  
  Past duration 0.789314 too large
  
  [hls @ 0x564c2be40e80] Cannot use rename on non file protocol, this may lead to races and temporary partial files
  
  [h264 @ 0x564c2ce43a40] concealing 1184 DC, 1184 AC, 1184 MV errors in I frame speed=0.971x    
  
  [h264 @ 0x564c2cef1280] Reference 3 >= 2=00:00:16.56 bitrate=N/A dup=83 drop=0 speed=0.985x    
  
  [h264 @ 0x564c2cef1280] error while decoding MB 44 32, bytestream 7180
  
  [h264 @ 0x564c2cef1280] concealing 4325 DC, 4325 AC, 4325 MV errors in B frame
  
  [h264 @ 0x564c2cf2a340] co located POCs unavailable
  
  [h264 @ 0x564c2ce43a40] co located POCs unavailable
  
  [mpegts @ 0x564c2be0a680] PES packet size mismatch02 bitrate=N/A dup=100 drop=0 speed=0.975x 
  
  frame=22321 fps=0.4 q=-1.0 Lsize=N/A time=00:12:24.03 bitrate=N/A dup=3720 drop=0 speed=0.0126x    
  
  video:46857kB audio:2907kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  My questions are

  • Why I’m getting "co located POC’s unavailable"
  • sps_id 0 out of range
  • SPS unavailable in decode_picture_timing