[FFmpeg-devel] Ffmpeg/ffprobe not work well with a DASH stream

["Chang, Xiangzhong" <xiangzhong.chang@telia.no>]

Hi,

Thank you so much for this amazing project. I’ve found this project has been extremely useful for me.
I’ve found out that ffmpeg/ffplay does not work well with one of our DASH streams. In comparison, I’ve tried the following players

  1.  ExoPlayer
  2.  DASH-JS player<https://reference.dashif.org/dash.js/v4.5.1/samples/dash-if-reference-player/index.html>
  3.  Bitmovin JS player<https://bitmovin.com/demos/stream-test?format=dash&manifest=https%3A%2F%2Fdirector.livecdn.teliaplay.net%2Fnotvm%2Fmso%2FTV_1HD%2Fdash%2Fmanifest.mpd>

I was using the following script trying to probe/transcoding one of our DASH stream.
```
ffprobe_g  -loglevel debug "https://director.livecdn.teliaplay.net/notvm/mso/TV_1HD/dash/manifest.mpd?abs_begin=2022-11-16T08:00:00Z&is_live&no_dolby"
```

The following log have drawn my attention. It seems like ffprobe has failed to download some file chunks.
```
[dash @ 0x55b477e86880] DASH request for url 'https://director.livecdn.teliaplay.net/notvm/mso/TV_1HD/dash/video-stream-1-150182387590546.mp4', offset 0
[tcp @ 0x55b477f09080] Starting connection attempt to 84.208.9.142 port 443
[tcp @ 0x55b477f09080] Successfully connected to 84.208.9.142 port 443
[tcp @ 0x55b477ed0f00] Starting connection attempt to 84.208.9.21 port 443
[tcp @ 0x55b477ed0f00] Successfully connected to 84.208.9.21 port 443
[https @ 0x55b477eee1c0] HTTP error 404 Not Found
```

However, when I was using wget to download it, all works out
```
hhk9417@HC994R6KQD:~/Desktop$ wget https://director.livecdn.teliaplay.net/notvm/mso/TV_1HD/dash/video-stream-1-150182387590546.mp4
--2022-11-17 14:53:30--  https://director.livecdn.teliaplay.net/notvm/mso/TV_1HD/dash/video-stream-1-150182387590546.mp4
Resolving director.livecdn.teliaplay.net (director.livecdn.teliaplay.net)... 84.208.9.75, 84.208.9.76, 84.208.9.141, ...
Connecting to director.livecdn.teliaplay.net (director.livecdn.teliaplay.net)|84.208.9.75|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://m323-cdne01.livecdn.teliaplay.net/notvm/mso/TV_1HD/dash/video-stream-1-150182387590546.mp4 [following]
--2022-11-17 14:53:30--  https://m323-cdne01.livecdn.teliaplay.net/notvm/mso/TV_1HD/dash/video-stream-1-150182387590546.mp4
Resolving m323-cdne01.livecdn.teliaplay.net (m323-cdne01.livecdn.teliaplay.net)... 84.208.9.21
Connecting to m323-cdne01.livecdn.teliaplay.net (m323-cdne01.livecdn.teliaplay.net)|84.208.9.21|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1293307 (1,2M) [video/mp4]
Saving to: ‘video-stream-1-150182387590546.mp4’

video-stream-1-150182387590546.mp4              100%[=====================================================================================================>]   1,23M  --.-KB/s    in 0,02s

2022-11-17 14:53:30 (50,8 MB/s) - ‘video-stream-1-150182387590546.mp4’ saved [1293307/1293307]
```

Regarding the FFmpeg SDK, I’m using the latest master branch, I’ve compiled it from scratch. The following are my compilation configs
```
--enable-gpl --enable-nonfree --enable-libfdk-aac --enable-libx264 --enable-libx265 --enable-filter=delogo --enable-debug --disable-optimizations --enable-libspeex --enable-shared --enable-pthreads --enable-vaapi --enable-ffplay --disable-stripping --enable-debug=3 --enable-libopus --enable-libv4l2 --enable-zlib --enable-vaapi --enable-pthreads --enable-vdpau --enable-xlib --enable-libv4l2 --enable-libfreetype --enable-demuxer=dash --enable-libxml2 --enable-libaom --enable-libx265 --enable-openssl"
#define FFMPEG_LICENSE "nonfree and unredistributable
```

Cheers.




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