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• ffmpeg - HLS stream audio error between segmets

  2 février 2019, par Carl

  I have a huge amount of mp4 files to create HLS segments from, more than 200 hours worth of files. I don’t see the point of re-encoding these videos because they are already in mp4 format. I’m using the following command which copies the video into segments instead of encoding it again.

  ffmpeg -i filename.mp4 -codec: copy -start_number 0 -hls_time 4 -hls_list_size 0 -f hls filename.m3u8

  The problem is when it comes to stitching these segments, I’m getting micro audio errors between segments. It’s hard to explain but imagine somebody turning audio off for 0.1 seconds. I doesn’t happen in all of the segments but in 20%-30% of them. Is there anything I can do stop these errors from popping up apart from reencoding all the videos. There are no problems with video btw.

  Here’s media info from one of the files :

  General
  Complete name : C :\video_test\video_file.mp4
  Format : MPEG-4
  Format profile : Base Media / Version 2
  Codec ID : mp42 (isom/iso2/avc1/mp41/mp42)
  File size : 45.7 MiB
  Duration : 7 min 34 s
  Overall bit rate mode : Variable
  Overall bit rate : 844 kb/s
  Writing application : Lavf53.32.100
  

  Video
  ID : 1
  Format : AVC
  Format/Info : Advanced Video Codec
  Format profile : High@L4
  Format settings, CABAC : Yes
  Format settings, RefFrames : 8 frames
  Codec ID : avc1
  Codec ID/Info : Advanced Video Coding
  Duration : 7 min 34 s
  Bit rate : 767 kb/s
  Width : 1 280 pixels
  Height : 720 pixels
  Display aspect ratio : 16:9
  Frame rate mode : Constant
  Frame rate : 30.000 FPS
  Color space : YUV
  Chroma subsampling : 4:2:0
  Bit depth : 8 bits
  Scan type : Progressive
  Bits/(Pixel*Frame) : 0.028
  Stream size : 41.5 MiB (91%)
  Writing library : x264 core 136
  Encoding settings : cabac=1 / ref=8 / deblock=1:0:0 / analyse=0x3:0x113 / me=umh / subme=6 / psy=0 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=48 / lookahead_threads=5 / 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=0 / keyint=60 / keyint_min=30 / scenecut=0 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=20.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00

  Audio
  ID : 2
  Format : AAC
  Format/Info : Advanced Audio Codec
  Format profile : LC
  Codec ID : 40
  Duration : 7 min 34 s
  Bit rate mode : Variable
  Bit rate : 72.0 kb/s
  Maximum bit rate : 96.0 kb/s
  Channel(s) : 2 channels
  Channel positions : Front : L R
  Sampling rate : 44.1 kHz
  Frame rate : 43.066 FPS (1024 SPF)
  Compression mode : Lossy
  Stream size : 3.92 MiB (9%)
  Language : English
  Default : Yes
  Alternate group : 1
  

  Edit : I just tried copying video and reencoding the audio with the following command but problem still persists.

  ffmpeg -i filename.mp4 -vcodec copy -c:a aac -ar 48000 -b:a 128k -start_number 0 -hls_time 4 -hls_list_size 0  -f hls filename.m3u8

• Can not download a streamable m3u8 link with IDM and ffmpeg

  15 juillet 2021, par long

  This is the link : https://v13.phephim.xyz/vod/v2/packaged:mp4/6005b3591918ee01c9ef67e4/playlist.m3u8

  


  It's ok to play the link with play-hls-m3u8 chrome extension or by the site https://www.hlsplayer.net/ but I got errors when trying to download it by ffmpeg :

  


  ffmpeg -i https://v13.phephim.xyz/vod/v2/packaged:mp4/6005b3591918ee01c9ef67e4/playlist.m3u8 -c copy OUTPUT.MP4


  


  Full log :

  


     ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
  configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
[hls @ 0x561c95a74c40] Skip ('#EXT-X-VERSION:3')
[hls @ 0x561c95a74c40] Opening 'https://v13.phephim.xyz/vod/v2/packaged:mp4/6005b3591918ee01c9ef67e4/0.ts?e=ad32a6dc7559f830a29b88ca30b975d90daef6578a563b09e97c798063c39de9fc124d470f75ad0220b9f440b7bd6767' for reading
[hls @ 0x561c95a74c40] Opening 'https://v13.phephim.xyz/vod/v2/packaged:mp4/6005b3591918ee01c9ef67e4/1.ts?e=e9b0a737f46906cdb4d67aed95e65ae4ab8eb401100eebce4e711ffdaf43c68fc2d8a49add4295587b38fe90c9d4cf86' for reading
[hls @ 0x561c95a74c40] Could not find codec parameters for stream 0 (Video: png, none(pc)): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, hls, from 'https://v13.phephim.xyz/vod/v2/packaged:mp4/6005b3591918ee01c9ef67e4/playlist.m3u8':
  Duration: 01:02:06.42, bitrate: 0 kb/s
  Program 0 
    Metadata:
      variant_bitrate : 0
    Stream #0:0: Video: png, none(pc), 25 tbr, 25 tbn, 25 tbc
    Metadata:
      variant_bitrate : 0
Output #0, mp4, to 'OUTPUT.MP4':
Output file #0 does not contain any stream


  


  I have tried to add some other command options but still got the same errors.

  


  Doing devtools inspect, I found
the .ts segment link redirected to another link that has the response header :

  


  content-disposition: inline;filename="unnamed.png"
content-type: image/png


  


  Is it normal ?

  


  Image : response header

  


  Pls help me to download the video. Thanks !

  


  p/s : sorry for my bad english :)

  


• FFMpeg embedding .srt file into hls stream playlist as WebVTT

  11 mai 2020, par user1503606

  I had an srt subtitle file see below.

  



  1
00:00:06,840 --> 00:00:10,320
once long ago in the deep blue below

2
00:00:12,360 --> 00:00:14,370
Don't be silly, Gran Mother

3
00:00:14,870 --> 00:00:16,700
Everybody knows there's no such thing as

4
00:00:16,700 --> 00:00:17,200
Mermaids

5
00:00:17,620 --> 00:00:21,570
You wouldn't say that if you has meet one. You've meet a Mermaid

6
00:00:24,250 --> 00:00:25,180
This just came in

7
00:00:25,480 --> 00:00:26,630
I wanted to take priority

8
00:00:27,180 --> 00:00:28,500
And we followed stories like this before

9
00:00:28,640 --> 00:00:31,620
Would witches working mummies. No not like this

10
00:00:31,630 --> 00:00:33,190
Hundreds of people are testifying

11
00:00:33,370 --> 00:00:34,600
Welcome to Mississippi

12
00:00:42,390 --> 00:00:47,270
There's a powerful magic in you the spirit of the ocean

13
00:00:47,690 --> 00:00:53,940
Let me introduce you to your dreams, The Little Mermaid, off the Mississippi

14
00:01:01,880 --> 00:01:03,580
She was so beautiful

15
00:01:04,040 --> 00:01:05,270
And I know she was real

16
00:01:07,850 --> 00:01:08,550
I'm skeptical

17
00:01:13,460 --> 00:01:14,410
You shouldn't be here

18
00:01:17,560 --> 00:01:24,130
Mermaids do not exist

19
00:01:31,420 --> 00:01:34,300
Look isn't it beautiful? Sorry I have to go.

20
00:01:35,340 --> 00:01:48,570
Elizabeth, How can this be? It's Lock he knows i'm here he summoned me.

21
00:01:48,570 --> 00:01:50,570
We have to save here.

22
00:02:03,570 --> 00:02:05,570
Here soul is mine

23
00:02:05,570 --> 00:02:06,570
Take it

24
00:02:10,570 --> 00:02:12,570
It's the only way

25
00:02:15,000 --> 00:02:17,570
I believe

26
00:02:23,000 --> 00:02:25,570
Mississippi has always been magic

27
00:02:36,000 --> 00:02:38,000
Elizabeth please


  



  If I use AWS Media convert to add this to my playlist it outputs the following.

  



  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:300
#EXT-X-MEDIA-SEQUENCE:1
#EXT-X-PLAYLIST-TYPE:VOD
#EXTINF:170,
masterCaptionsEnglish/English.vtt
#EXT-X-ENDLIST


  



  And the WebVTT file looks like this.

  



  WEBVTT  #Elemental Media Engine(TM) 2.16.0.602399
X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:191970

00:00:06.840 --> 00:00:10.320
once long ago in the deep blue below

00:00:12.360 --> 00:00:14.370
Don't be silly, Gran Mother

00:00:14.870 --> 00:00:16.700
Everybody knows there's no such thing as

00:00:16.700 --> 00:00:17.200
Mermaids

00:00:17.620 --> 00:00:21.570
You wouldn't say that if you has meet one. You've meet a Mermaid

00:00:24.250 --> 00:00:25.180
This just came in

00:00:25.480 --> 00:00:26.630
I wanted to take priority

00:00:27.180 --> 00:00:28.500
And we followed stories like this before

00:00:28.640 --> 00:00:31.620
Would witches working mummies. No not like this

00:00:31.630 --> 00:00:33.190
Hundreds of people are testifying

00:00:33.370 --> 00:00:34.600
Welcome to Mississippi

00:00:42.390 --> 00:00:47.270
There's a powerful magic in you the spirit of the ocean

00:00:47.690 --> 00:00:53.940
Let me introduce you to your dreams, The Little Mermaid, off the Mississippi

00:01:01.880 --> 00:01:03.580
She was so beautiful

00:01:04.040 --> 00:01:05.270
And I know she was real

00:01:07.850 --> 00:01:08.550
I'm skeptical

00:01:13.460 --> 00:01:14.410
You shouldn't be here

00:01:17.560 --> 00:01:24.130
Mermaids do not exist

00:01:31.420 --> 00:01:34.300
Look isn't it beautiful? Sorry I have to go.

00:01:35.340 --> 00:01:48.570
Elizabeth, How can this be? It's Lock he knows i'm here he summoned me.

00:01:48.570 --> 00:01:50.570
We have to save here.

00:02:03.570 --> 00:02:05.570
Here soul is mine

00:02:05.570 --> 00:02:06.570
Take it

00:02:10.570 --> 00:02:12.570
It's the only way

00:02:15.000 --> 00:02:17.570
I believe

00:02:23.000 --> 00:02:25.570
Mississippi has always been magic

00:02:36.000 --> 00:02:38.000
Elizabeth please


  



  I am trying to replicate this with FFMpeg. I have tried the following command.

  



  ffmpeg -i little-mermaid.mov -i little-mermaid.srt -c copy -c:s webvtt -start_number 0 -hls_time 10000 -f hls mermaid/Eng/master.m3u8


  



  This creates a WebVTT file but it is completely wrong and out of sync. See below.

  



  All the times have changed and it's removed the first two digits from each section.

  



  WEBVTT

00:06.882 --> 00:10.362
once long ago in the deep blue below

00:12.402 --> 00:14.412
Don't be silly, Gran Mother

00:14.912 --> 00:16.742
Everybody knows there's no such thing as

00:16.742 --> 00:17.242
Mermaids

00:00:17.620 -- 00:00:21.570
You wouldn't say that if you has meet one. You've meet a Mermaid

00:24.292 --> 00:25.222
This just came in

00:25.522 --> 00:26.672
I wanted to take priority

00:27.222 --> 00:28.542
And we followed stories like this before

00:28.682 --> 00:31.662
Would witches working mummies. No not like this

00:31.672 --> 00:33.232
Hundreds of people are testifying

00:33.412 --> 00:34.642
Welcome to Mississippi

00:42.432 --> 00:47.312
There's a powerful magic in you the spirit of the ocean

00:47.732 --> 00:53.982
Let me introduce you to your dreams, The Little Mermaid, off the Mississippi

01:01.922 --> 01:03.622
She was so beautiful

01:04.082 --> 01:05.312
And I know she was real

01:07.892 --> 01:08.592
I'm skeptical

01:13.502 --> 01:14.452
You shouldn't be here

01:17.602 --> 01:24.172
Mermaids do not exist

01:31.462 --> 01:34.342
Look isn't it beautiful? Sorry I have to go.

01:35.382 --> 01:48.612
Elizabeth, How can this be? It's Lock he knows i'm here he summoned me.

01:48.612 --> 01:50.612
We have to save here.

02:03.612 --> 02:05.612
Here soul is mine

02:05.612 --> 02:06.612
Take it

02:10.612 --> 02:12.612
It's the only way

02:15.042 --> 02:17.612
I believe

02:23.042 --> 02:25.612
Mississippi has always been magic

02:36.042 --> 02:38.042
Elizabeth please


  



  I am trying to decide if it just makes sense to convert the .srt to WebVTT and use that file without encoding with FFMPEG just create a .m3u8 file with -hls_flag single_file that points to it but not sure what implementation this might cause.

  



  Can anyone suggest how I could do this or where I might be going wrong ?

  



  Here is the video file I am using if anyone wants to run the FFMPEG command above to test.

  



  http://www.hd-trailers.net/movie/the-little-mermaid/

  



  Thanks