[AMZ] - Audio Cutoffs [1061]

Discussion in 'AnyStream' started by Ch3vr0n, Nov 8, 2020.

  1. Ch3vr0n

    Ch3vr0n Translator NL & Mod

    I've seen a few posts on this across various topics but i don't think there's been a specific topic for it. Been trying to reproduce it to no avail, until now. Was able to confirm the behavior using AS 1061 on Prime US, with Chicago Med S01E03. Progress bar jumps from 98% to complete, and the last 20 seconds i'd say lack audio. For me it's not such a big deal as for that episode we're well into the outro credits then.

    Log attached. Will try more

    ** edit ** consecutive episode 4 & 5 don't have that problem. For the moment specific to that episode. Though maybe it'll offer a clue
     

    Attached Files:

    Last edited: Nov 8, 2020
  2. Prospere

    Prospere RedFox Development Team

    Alright, thanks!
     
  3. Mollenoh

    Mollenoh Active Member

    https://forum.redfox.bz/threads/1-0-5-0-still-truncates-audio-on-some-episodes.79572/

    I can confirm that the problem is still there in version 1.0.6.1.

    It happens every time with some specific episodes, both on Amazon Prime and Netflix. So I've made a habit of opening the video properties in Media Player Classic HC and checking the length of the video and audio tracks. If the difference is more than a couple of seconds, I make a note to re-download that episode once the bug has been fixed.

    As you can see below, the soundtrack for Chicago Med s01e03 is 41:07 while the video is 41:38, a difference of 31 seconds!

    (In some cases Netflix has very long silent end credits for many different languages. In those cases, only silence may be chopped off so you won't notice it by just playing the episodes. But the bug is still there, and can be seen by examining the properties of the file.)

    General
    Complete name : C:\Users\Mollenoh\Videos\AnyStream\Chicago Med - s01e03 - Fallback.mp4
    Format : MPEG-4
    Format profile : Base Media
    Codec ID : isom (isom/iso2/avc1/mp41/iso6/piff)
    File size : 3.78 GiB
    Duration : 41 min 38 s
    Overall bit rate : 13.0 Mb/s
    Movie name : Fallback
    Encoded date : UTC 2020-11-09 07:37:41
    Tagged date : UTC 2020-11-09 07:37:41
    Comment : When Dr. Connor Rhodes (Colin Donnell) takes the case of a close family friend who's been impaled by glass shards, he's reunited with his sister, Claire Rhodes (guest start Christina Brucato), and forced to confront his past.

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : High@L4
    Format settings : CABAC / 4 Ref Frames
    Format settings, CABAC : Yes
    Format settings, Reference fra : 4 frames
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 41 min 38 s
    Bit rate : 12.4 Mb/s
    Maximum bit rate : 23.7 Mb/s
    Width : 1 920 pixels
    Height : 1 080 pixels
    Display aspect ratio : 16:9
    Frame rate mode : Constant
    Frame rate : 24.000 FPS
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.249
    Stream size : 3.60 GiB (95%)
    Encoded date : UTC 2020-11-09 07:37:41
    Tagged date : UTC 2020-11-09 07:37:41
    Color range : Limited
    Color primaries : BT.709
    Transfer characteristics : BT.709
    Matrix coefficients : BT.709
    Codec configuration box : avcC

    Audio
    ID : 2
    Format : E-AC-3
    Format/Info : Enhanced AC-3
    Commercial name : Dolby Digital Plus
    Codec ID : ec-3
    Duration : 41 min 7 s
    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 : 188 MiB (5%)
    Language : English
    Service kind : Complete Main
    Encoded date : UTC 2020-11-09 07:37:41
    Tagged date : UTC 2020-11-09 07:37:41
     
  4. Prospere

    Prospere RedFox Development Team

    @Mollenoh I'd appreciate if you share the list of problematic titles. I assume not all of them are available in my region, but I need some "meat" to work with. Otherwise, it would be more of a guess game.
     
  5. Mollenoh

    Mollenoh Active Member

    Sure.

    On Amazon Prime:
    Mortified season 1 episodes 1, 8 and 11
    Chicago Med season 1 episode 3
    The Irish Mob season 1 episode 1

    On Netflix:
    Mako Mermaids season 1 episodes 9** and 13**, season 2 episode 12, season 4 episode 8**
    The Worst Witch season 4 episode 13**
    Bad Education season 3 episode 1
    The Barrier (La valla) season 1 episodes 3 and 4

    ** Only cuts off silence at the end. You'll have to examine the file to see that the audio is significantly shorter than the video.
     
    Last edited: Nov 14, 2020
  6. 0x0x0x0x0

    0x0x0x0x0 Well-Known Member

    I just checked the UK side of things, and it's OK (container: 00:41:38.048, video: 00:41:37.996, audio: 00:41:38.048), so could be server specific, but I am still on 1060.
     
  7. Ch3vr0n

    Ch3vr0n Translator NL & Mod

    Worth a try. Though tbh in this case for that chicago med episode i'm not going to stress over it. The credits have been rolling for a while then and i don't think anyone actually reads those. I sure don't.
     
  8. Mollenoh

    Mollenoh Active Member

    I don't care so much about reading the end credits either, but I often let the episodes play to the very end just to listen to the music. If a show and its music are good, it brings you into the mood of that show. If the music suddenly stops before the end, it causes a brutal "awakening" that destroys lots of that "magic".

    The important thing is that there's apparently a bug here that will affect several episodes on both Amazon Prime and Netflix, who knows how many? It's likely that there are many more than the few you and I have found. There's nothing apparently wrong when playing the episodes on-line without downloading them.
     
  9. 0x0x0x0x0

    0x0x0x0x0 Well-Known Member

    It's actually fairly trivial to check if you have any tool that could get track durations out of containers. In case of mediainfo, for example, just check that |Video;%Duration% - Audio;%Duration%| <= 5000ms let's say...
     
  10. Prospere

    Prospere RedFox Development Team

    Thanks for the info. Checking.
     
  11. 0x0x0x0x0

    0x0x0x0x0 Well-Known Member

    Since as you're presumably walking through MP4 boxes in post-processing anyway, perhaps you could keep a tally of times and check the totals are within a tolerance of, say, 5 seconds? This would at least flag downloads are have one track way shorter than another. :)

    I've written a quick shell script (should work in any flavour of UNIX or WSL2) that checks if video and audio tracks are within a specified tolerance, if people want I'd happily post it.
     
    Last edited: Nov 9, 2020
  12. Dissones4u

    Dissones4u Active Member

    I'm 100% shooting in the dark here but I was having a similar issue even prior to AS, some episodes would autostart the next episode in line before the current episode was finished (sometimes skipping more than 2 minutes). It only happened with a handful of episodes but it was really irratating. I turned off "auto start next episode" and hasn't happened since. Again, this was only a handful of episodes out of thousands so it must be something related to how the episode was setup on their end. It can't hurt to give it a try, if you have auto play currently enabled.
     
  13. Ch3vr0n

    Ch3vr0n Translator NL & Mod

    There is no Autoplay in AnyStream. The source file itself is lacking audio in the last 20 seconds.

    Playback method can't play audio, if the audio track itself is shorter than the video.

    Sent from my Pixel 3 XL using Tapatalk
     
    Dissones4u likes this.
  14. 0x0x0x0x0

    0x0x0x0x0 Well-Known Member

    @Prospere, so I did some experimenting with 'flix, having found a title that is consistently short, and it seems DD+/AAC makes no difference either (actually, one is worse!)

    Code:
    find . -name \*mp4 -exec ~/as_chk  5 {} \;
    ./lab/DDP/title.mp4: audio shorter than container by ~19 seconds [c|v|a = 1658120|1658120|1639008]
    ./lab/AAC/title.mp4: audio shorter than container by ~27 seconds [c|v|a = 1658120|1658120|1630336]
    
    (c)ontainer, (v)ideo, and (a)udio times are in milliseconds; and it's not that the container is too long, the audio does cut out, I checked :)
     

    Attached Files:

  15. Prospere

    Prospere RedFox Development Team

    Just the log is enough. It clearly shows the problem happening, it's just that we are trying to locate the root of it.
     
  16. 0x0x0x0x0

    0x0x0x0x0 Well-Known Member


    Don't know if it's relevant at all: the video is fetched from one of the "motherships" whereas the audio is fetched from ISP's cache :)