DASH/Fragments: don't assume every fragment uses the same duration

[wiiaboo]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.01.28. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2017.01.28

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• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

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• Bug report (encountered problems with youtube-dl)
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---

$ C:\builds\youtube-dl-git>py -m youtube_dl -v -J --ignore-config P_gg6fGppwM -f bestvideo > json.json
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '-J', '--ignore-config', 'P_gg6fGppwM', '-f', 'bestvideo']
[debug] Encodings: locale cp1252, fs utf-8, out cp1252, pref cp1252
[debug] youtube-dl version 2017.01.28
[debug] Lazy loading extractors enabled
[debug] Git HEAD: 76aaf1f
[debug] Python version 3.6.0 - Windows-10-10.0.14393-SP0
[debug] exe versions: ffmpeg N-83250-g95bde49982, ffprobe N-83250-g95bde49982, rtmpdump 2.4-20151223-gfa8646d-LibreSSL_2.3.4-x86_64-static
[debug] Proxy map: {}

json.json:

"fragments": [
        (...)
        {
            "duration": 5.005,
            "url": "https://r3---sn-8vq54vox2u-apnl.googlevideo.com/videoplayback/id/3ff820e9f1a9a703/itag/137/source/yt_otf/requiressl/yes/pcm2cms/yes/pl/17/mv/m/ms/au/initcwndbps/4502500/mn/sn-8vq54vox2u-apnl/mm/31/ratebypass/yes/mime/video%2Fmp4/otfp/1/otf/1/lmt/1462234017178236/upn/MxkIUAKaORQ/key/dg_yt0/mt/1485636923/signature/9AB39F7044C52CE997F6D46DCADD26820FD58E03.6FF2B70380BFB1D09A1937B439B106301177CDD4/ip/89.114.246.10/ipbits/0/expire/1485658596/sparams/ip,ipbits,expire,id,itag,source,requiressl,pcm2cms,pl,mv,ms,initcwndbps,mn,mm,ratebypass,mime,otfp,otf,lmt/sq/31/dur/5.005"
        },
        {
            "duration": 5.005,
            "url": "https://r3---sn-8vq54vox2u-apnl.googlevideo.com/videoplayback/id/3ff820e9f1a9a703/itag/137/source/yt_otf/requiressl/yes/pcm2cms/yes/pl/17/mv/m/ms/au/initcwndbps/4502500/mn/sn-8vq54vox2u-apnl/mm/31/ratebypass/yes/mime/video%2Fmp4/otfp/1/otf/1/lmt/1462234017178236/upn/MxkIUAKaORQ/key/dg_yt0/mt/1485636923/signature/9AB39F7044C52CE997F6D46DCADD26820FD58E03.6FF2B70380BFB1D09A1937B439B106301177CDD4/ip/89.114.246.10/ipbits/0/expire/1485658596/sparams/ip,ipbits,expire,id,itag,source,requiressl,pcm2cms,pl,mv,ms,initcwndbps,mn,mm,ratebypass,mime,otfp,otf,lmt/sq/32/dur/5.839"
        }

The duration on the last segment should be 5.839. Also very noticeable with -f bestaudio:

    "fragments": [
        {
            "url": "https://r3---sn-8vq54vox2u-apnl.googlevideo.com/videoplayback/id/3ff820e9f1a9a703/itag/140/source/youtube/requiressl/yes/mv/m/ms/au/initcwndbps/4340000/pl/17/mm/31/mn/sn-8vq54vox2u-apnl/pcm2cms/yes/ratebypass/yes/mime/audio%2Fmp4/otfp/1/gir/yes/clen/2559533/lmt/1389776821754985/dur/161.100/mt/1485637227/signature/7F8067EA8CDC8319EE15DF45324B12A496C8D3AA.9214872DA92D30DBC905458C4F7CD1EF2A91C31F/upn/oIgXFL1x5os/key/dg_yt0/ip/89.114.246.10/ipbits/0/expire/1485658999/sparams/ip,ipbits,expire,id,itag,source,requiressl,mv,ms,initcwndbps,pl,mm,mn,pcm2cms,ratebypass,mime,otfp,gir,clen,lmt,dur/range/0-591"
        },
        {
            "duration": 10.008,
            "url": "https://r3---sn-8vq54vox2u-apnl.googlevideo.com/videoplayback/id/3ff820e9f1a9a703/itag/140/source/youtube/requiressl/yes/mv/m/ms/au/initcwndbps/4340000/pl/17/mm/31/mn/sn-8vq54vox2u-apnl/pcm2cms/yes/ratebypass/yes/mime/audio%2Fmp4/otfp/1/gir/yes/clen/2559533/lmt/1389776821754985/dur/161.100/mt/1485637227/signature/7F8067EA8CDC8319EE15DF45324B12A496C8D3AA.9214872DA92D30DBC905458C4F7CD1EF2A91C31F/upn/oIgXFL1x5os/key/dg_yt0/ip/89.114.246.10/ipbits/0/expire/1485658999/sparams/ip,ipbits,expire,id,itag,source,requiressl,mv,ms,initcwndbps,pl,mm,mn,pcm2cms,ratebypass,mime,otfp,gir,clen,lmt,dur/range/828-160112"
        },
        {
            "duration": 10.008,
            "url": "https://r3---sn-8vq54vox2u-apnl.googlevideo.com/videoplayback/id/3ff820e9f1a9a703/itag/140/source/youtube/requiressl/yes/mv/m/ms/au/initcwndbps/4340000/pl/17/mm/31/mn/sn-8vq54vox2u-apnl/pcm2cms/yes/ratebypass/yes/mime/audio%2Fmp4/otfp/1/gir/yes/clen/2559533/lmt/1389776821754985/dur/161.100/mt/1485637227/signature/7F8067EA8CDC8319EE15DF45324B12A496C8D3AA.9214872DA92D30DBC905458C4F7CD1EF2A91C31F/upn/oIgXFL1x5os/key/dg_yt0/ip/89.114.246.10/ipbits/0/expire/1485658999/sparams/ip,ipbits,expire,id,itag,source,requiressl,mv,ms,initcwndbps,pl,mm,mn,pcm2cms,ratebypass,mime,otfp,gir,clen,lmt,dur/range/160113-318780"
        },
        {
            "duration": 10.008,
            "url": "https://r3---sn-8vq54vox2u-apnl.googlevideo.com/videoplayback/id/3ff820e9f1a9a703/itag/140/source/youtube/requiressl/yes/mv/m/ms/au/initcwndbps/4340000/pl/17/mm/31/mn/sn-8vq54vox2u-apnl/pcm2cms/yes/ratebypass/yes/mime/audio%2Fmp4/otfp/1/gir/yes/clen/2559533/lmt/1389776821754985/dur/161.100/mt/1485637227/signature/7F8067EA8CDC8319EE15DF45324B12A496C8D3AA.9214872DA92D30DBC905458C4F7CD1EF2A91C31F/upn/oIgXFL1x5os/key/dg_yt0/ip/89.114.246.10/ipbits/0/expire/1485658999/sparams/ip,ipbits,expire,id,itag,source,requiressl,mv,ms,initcwndbps,pl,mm,mn,pcm2cms,ratebypass,mime,otfp,gir,clen,lmt,dur/range/318781-477320"
        },
(...)

According to the manifest, the third segment should be 9.984s, not 10.008.

(...)
                    <S d="5005"/>
                    <S d="5839"/>
                </SegmentTimeline>

<SegmentTimeline>
                    <S d="10008"/>
                    <S d="10008"/>
                    <S d="9984"/>
(...)