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[Marees213]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2019.01.24. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

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[download] Downloading video 163 of 262
[youtube] yPrcfawo9UM: Downloading webpage
[youtube] yPrcfawo9UM: Downloading video info webpage
WARNING: unable to extract uploader name
WARNING: unable to extract uploader nickname
WARNING: unable to extract channel id; please report this issue on **https://yt-dl.org/bug** . Make sure you are using the latest version; see https://yt-dl.org/update on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
[youtube] yPrcfawo9UM: Downloading thumbnail ...
[youtube] yPrcfawo9UM: Writing thumbnail to: The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.jpg
[download] Destination: The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.f248.webm
[download] 100% of 19.56MiB in 00:02
[download] Destination: The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.f251.webm
[download] 100% of 5.22MiB in 00:00
[ffmpeg] Merging formats into "The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.webm"
Deleting original file The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.f248.webm (pass -k to keep)
Deleting original file The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.f251.webm (pass -k to keep)
[ffmpeg] Converting video from webm to mp4, Destination: The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.mp4
Deleting original file The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.webm (pass -k to keep)

[shinji257]

Please post a complete verbose log of the issue so that it can be reproduced. The above tells us you have an issue but it doesn't tell us where you are getting the video from.

Anyways I did find the video. It's on youtube. With all that said I can't reproduce the issue however I don't know what options were being passed. I tested as just a single video and as a playlist (now 262 videos long) with just the issue video above being selected.

Example Video: https://www.youtube.com/watch?v=yPrcfawo9UM
Example Playlist (Item 163 in here): https://www.youtube.com/watch?v=EbBHk_zLTmY&list=PLhyKYa0YJ_5Aq7g4bil7bnGi0A8gTsawu
Log (video directly):

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'https://www.youtube.com/watch?v=yPrcfawo9UM', u'-v']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.01.24
[debug] Python version 2.7.12 (CPython) - Linux-4.2.8-x86_64-with-Ubuntu-16.04-xenial
[debug] exe versions: ffmpeg 3.2.2-2, ffprobe 3.2.2-2
[debug] Proxy map: {}
[youtube] yPrcfawo9UM: Downloading webpage
[youtube] yPrcfawo9UM: Downloading video info webpage
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on u'https://r2---sn-uhvcpax0n5-2ial.googlevideo.com/videoplayback?key=yt6&source=youtube&dur=372.767&lmt=1540873796897882&beids=9466585&expire=1548453553&clen=20513163&ipbits=0&mime=video%2Fwebm&pl=21&mt=1548431853&sparams=aitags%2Cclen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cusequic%2Cexpire&ei=UDJLXIflOY_u8wTY_rKgCQ&mv=m&initcwndbps=141250&ms=au%2Crdu&itag=248&mm=31%2C29&mn=sn-uhvcpax0n5-2ial%2Csn-p5qlsnsk&txp=5432432&keepalive=yes&c=WEB&id=o-AHO7M2mlmHQDmrn0DHz1XZezrEZapT9boaxzlZaCv2T5&aitags=133%2C134%2C135%2C136%2C137%2C160%2C242%2C243%2C244%2C247%2C248%2C278&usequic=no&ip=172.58.200.86&requiressl=yes&gir=yes&signature=0381E44011C7586215082E2C6D1A0399EEBCA0FA.522404B323B48BF7597AE0BC433A81809F654715&fvip=2&ratebypass=yes'
[download] Destination: The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.f248.webm
[download] 100% of 19.56MiB in 00:11
[debug] Invoking downloader on u'https://r2---sn-uhvcpax0n5-2ial.googlevideo.com/videoplayback?key=yt6&source=youtube&dur=372.781&lmt=1540874187333700&beids=9466585&expire=1548453553&clen=5469336&ipbits=0&mime=audio%2Fwebm&pl=21&mt=1548431853&sparams=clen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cusequic%2Cexpire&ei=UDJLXIflOY_u8wTY_rKgCQ&mv=m&initcwndbps=141250&ms=au%2Crdu&itag=251&mm=31%2C29&mn=sn-uhvcpax0n5-2ial%2Csn-p5qlsnsk&txp=5411222&keepalive=yes&c=WEB&id=o-AHO7M2mlmHQDmrn0DHz1XZezrEZapT9boaxzlZaCv2T5&usequic=no&ip=172.58.200.86&requiressl=yes&gir=yes&signature=69A7858D360D75ACD54FDD58714376E2510E02DF.22D7E2E74B13D2E95E27C58BFF8D9A19150C23E4&fvip=2&ratebypass=yes'
[download] Destination: The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.f251.webm
[download] 100% of 5.22MiB in 00:02
[ffmpeg] Merging formats into "The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.webm"
[debug] ffmpeg command line: ffmpeg -y -i 'file:The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.f248.webm' -i 'file:The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.f251.webm' -c copy -map '0:v:0' -map '1:a:0' 'file:The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.temp.webm'
Deleting original file The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.f248.webm (pass -k to keep)
Deleting original file The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.f251.webm (pass -k to keep)

Log (via playlist only downloading item 163 -- same video as above):

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'https://www.youtube.com/watch?v=EbBHk_zLTmY&list=PLhyKYa0YJ_5Aq7g4bil7bnGi0A8gTsawu', u'--playlist-items', u'163', u'-v']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.01.24
[debug] Python version 2.7.12 (CPython) - Linux-4.2.8-x86_64-with-Ubuntu-16.04-xenial
[debug] exe versions: ffmpeg 3.2.2-2, ffprobe 3.2.2-2
[debug] Proxy map: {}
[youtube:playlist] Downloading playlist PLhyKYa0YJ_5Aq7g4bil7bnGi0A8gTsawu - add --no-playlist to just download video EbBHk_zLTmY
[youtube:playlist] PLhyKYa0YJ_5Aq7g4bil7bnGi0A8gTsawu: Downloading webpage
[download] Downloading playlist: Extra History: All Episodes
[youtube:playlist] PLhyKYa0YJ_5Aq7g4bil7bnGi0A8gTsawu: Downloading page #1
[youtube:playlist] playlist Extra History: All Episodes: Downloading 1 videos
[download] Downloading video 1 of 1
[youtube] yPrcfawo9UM: Downloading webpage
[youtube] yPrcfawo9UM: Downloading video info webpage
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on u'https://r2---sn-uhvcpax0n5-2ial.googlevideo.com/videoplayback?mv=m&mt=1548432029&ms=au%2Crdu&id=o-AEMzmUGOxx-ee8KVZnerMK19SwV04T0PzlsOpa4MZBUF&expire=1548453714&mime=video%2Fwebm&ip=172.58.200.86&requiressl=yes&pl=21&mn=sn-uhvcpax0n5-2ial%2Csn-p5qlsnsk&mm=31%2C29&source=youtube&ei=8jJLXKn9L9a4hgbclbfgDw&gir=yes&lmt=1540873796897882&sparams=aitags%2Cclen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cusequic%2Cexpire&aitags=133%2C134%2C135%2C136%2C137%2C160%2C242%2C243%2C244%2C247%2C248%2C278&initcwndbps=145000&signature=2C842BDB2142BE016A1D0036FC58805E557160AD.DCAFB068938DC2B870515C455DC304DE8D46F21D&usequic=no&fvip=2&dur=372.767&itag=248&txp=5432432&clen=20513163&c=WEB&key=yt6&keepalive=yes&ipbits=0&ratebypass=yes'
[download] Destination: The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.f248.webm
[download] 100% of 19.56MiB in 00:10
[debug] Invoking downloader on u'https://r2---sn-uhvcpax0n5-2ial.googlevideo.com/videoplayback?mv=m&mt=1548432029&ms=au%2Crdu&id=o-AEMzmUGOxx-ee8KVZnerMK19SwV04T0PzlsOpa4MZBUF&expire=1548453714&mime=audio%2Fwebm&ip=172.58.200.86&requiressl=yes&pl=21&mn=sn-uhvcpax0n5-2ial%2Csn-p5qlsnsk&mm=31%2C29&source=youtube&ei=8jJLXKn9L9a4hgbclbfgDw&gir=yes&lmt=1540874187333700&sparams=clen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cusequic%2Cexpire&initcwndbps=145000&signature=03ECC1B84F82C972CBF7F737F84FAB766EA777C4.77E22642D0BB63F6AFF496C3AE57907E53EA9D50&usequic=no&fvip=2&dur=372.781&itag=251&txp=5411222&clen=5469336&c=WEB&key=yt6&keepalive=yes&ipbits=0&ratebypass=yes'
[download] Destination: The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.f251.webm
[download] 100% of 5.22MiB in 00:02
[ffmpeg] Merging formats into "The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.webm"
[debug] ffmpeg command line: ffmpeg -y -i 'file:The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.f248.webm' -i 'file:The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.f251.webm' -c copy -map '0:v:0' -map '1:a:0' 'file:The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.temp.webm'
Deleting original file The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.f248.webm (pass -k to keep)
Deleting original file The Alphabet - Origins of Writing - Extra History-yPrcfawo9UM.f251.webm (pass -k to keep)
[download] Finished downloading playlist: Extra History: All Episodes

If you are able to reproduce it please post the complete verbose log as specified above in your warning message.