Recognize Error When Merging Extention

[goodboi69]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2019.03.01. 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 Issues with outdated version will be rejected.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 2019.03.01

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• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

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• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

Add the -v flag to your command line you run youtube-dl with (youtube-dl -v <your command line>), copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

C:\Users\username>youtube-dl -f bestvideo+bestaudio --merge-output-format mp4 https://www.youtube.com/watch?v=FiX1WYee3NA
[youtube] FiX1WYee3NA: Downloading webpage
[youtube] FiX1WYee3NA: Downloading video info webpage
[download] Destination: Fastest nope in the west-FiX1WYee3NA.f136.mp4
[download] 100% of 3.00MiB in 00:00
[download] Destination: Fastest nope in the west-FiX1WYee3NA.f251.webm
[download] 100% of 326.71KiB in 00:00
[ffmpeg] Merging formats into "Fastest nope in the west-FiX1WYee3NA.mp4"
ERROR:   Stream #1:0 -> #0:1 (copy)

C:\Users\username>
...
<end of log>

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If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• Single video: https://www.youtube.com/watch?v=FiX1WYee3NA

Note that youtube-dl does not support sites dedicated to copyright infringement. In order for site support request to be accepted all provided example URLs should not violate any copyrights.

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Description of your issue, suggested solution and other information

If when downloading a Youtube video without checking the type of best video and audio fails to merge the specified file extention, could youtube-dl recognize this fail and try another extention. In the example above I tried the best video and audio with the mp4 extention and it failed. But with the mkv extention it merged fine. Now, youtube-dl can recognize errors so it could be possible.

[ttpcodes]

I'm seeing this issue as well, on version 2019.03.18. Here are some more URLs that cause an error when merging:

• https://www.youtube.com/watch?v=k9iYm9PEAHg
• https://www.youtube.com/watch?v=hMc8naeeSS8

I'll update this comment as I dig up more links I've had issues with, but please look into this issue.

[remitamine]

missing verbose log, also make sure you're using an updated ffmpeg version.

[ttpcodes]

Thanks for the heads up about the ffmpeg version. I updated to the latest ffmpeg version and this issue has disappeared.

[genewitch]

adding a full error message:

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--merge-output-format', 'mp4', '-f', 'bestvideo[height<=480]+bestaudio/best[height<=480]', 'https://www.youtube.com/playlist?list=PLgUGfzMeW6jJLx3asjLlVepax5U9HowbC']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.04.01
[debug] Python version 3.6.5 (CPython) - Linux-4.14.65-gentoo-x86_64-QEMU_Virtual_CPU_version_2.5+-with-gentoo-2.6
[debug] exe versions: ffmpeg 4.1.3, ffprobe 4.1.3
[debug] Proxy map: {}
[youtube:playlist] PLgUGfzMeW6jJLx3asjLlVepax5U9HowbC: Downloading webpage
[download] Downloading playlist: New building lot; excavation
[youtube:playlist] playlist New building lot; excavation: Downloading 13 videos
[download] Downloading video 1 of 13
[youtube] Az45HYnAAps: Downloading webpage
[youtube] Az45HYnAAps: Downloading video info webpage
[debug] Invoking downloader on 'https://r1---sn-q4fl6ns7.googlevideo.com/videoplayback?ei=VLGiXN6fCYmltQer94ewDw&mm=31%2C26&ipbits=0&aitags=133%2C134%2C135%2C136%2C137%2C160%2C242%2C243%2C244%2C247%2C248%2C271%2C278%2C313&sparams=aitags%2Cclen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cexpire&initcwndbps=207500&c=WEB&id=o-AEzVBU4kdbsu3QoSnFL0NsQYbaBqSM-ZA6luzt2NAQqq&gir=yes&clen=114506032&mn=sn-q4fl6ns7%2Csn-5uaeznys&ms=au%2Conr&mt=1554166027&mv=m&ip=107.77.200.172&signature=219048D99326CD2672B768A2B701AD552B0CCC0F.89F747874BF5CBCA7BE87F9F0A3376794F6A483E&fvip=1&dur=853.894&lmt=1536152368931361&keepalive=yes&expire=1554187700&pl=24&mime=video%2Fmp4&key=yt6&source=youtube&requiressl=yes&itag=135&ratebypass=yes'
[download] Installing a driveway entrance-Az45HYnAAps.f135.mp4 has already been downloaded
[download] 100% of 109.20MiB
[debug] Invoking downloader on 'https://r1---sn-q4fl6ns7.googlevideo.com/videoplayback?ei=VLGiXN6fCYmltQer94ewDw&mm=31%2C26&ipbits=0&sparams=clen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cexpire&initcwndbps=207500&c=WEB&id=o-AEzVBU4kdbsu3QoSnFL0NsQYbaBqSM-ZA6luzt2NAQqq&gir=yes&clen=14495983&mn=sn-q4fl6ns7%2Csn-5uaeznys&ms=au%2Conr&mt=1554166027&mv=m&ip=107.77.200.172&signature=404AC5DE103EB89305A8A6C8977CAA0F679ED637.9E93FC1878322871945B19F0F7DE7F86524611AE&fvip=1&dur=853.921&lmt=1536241599029616&keepalive=yes&expire=1554187700&pl=24&mime=audio%2Fwebm&key=yt6&source=youtube&requiressl=yes&itag=251&ratebypass=yes'
[download] Installing a driveway entrance-Az45HYnAAps.f251.webm has already been downloaded
[download] 100% of 13.82MiB
[ffmpeg] Merging formats into "Installing a driveway entrance-Az45HYnAAps.mp4"
[debug] ffmpeg command line: ffmpeg -y -loglevel repeat+info -i 'file:Installing a driveway entrance-Az45HYnAAps.f135.mp4' -i 'file:Installing a driveway entrance-Az45HYnAAps.f251.webm' -c copy -map 0:v:0 -map 1:a:0 'file:Installing a driveway entrance-Az45HYnAAps.temp.mp4'
ERROR:   Stream #1:0 -> #0:1 (copy)
Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 2052, in post_process
    files_to_delete, info = pp.run(info)
  File "/usr/lib64/python3.6/site-packages/youtube_dl/postprocessor/ffmpeg.py", line 512, in run
    self.run_ffmpeg_multiple_files(info['__files_to_merge'], temp_filename, args)
  File "/usr/lib64/python3.6/site-packages/youtube_dl/postprocessor/ffmpeg.py", line 235, in run_ffmpeg_multiple_files
    raise FFmpegPostProcessorError(msg)
youtube_dl.postprocessor.ffmpeg.FFmpegPostProcessorError:   Stream #1:0 -> #0:1 (copy)

youtube-dl version 2019.04.01; ffmpeg version 4.1.3

[remitamine]

@genewitch you have to select compatible formats for the container that you have selected(mp4 and m4a formats for the mp4 container).