Error with bestvideo[ext=mp4]+bestaudio[ext=m4a]/bestvideo+bestaudio

[malaterre]

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• You will be asked some questions and requested to provide some information, please read them carefully and answer honestly
• Put an x into all the boxes [ ] relevant to your issue (like this: [x])
• Use the Preview tab to see what your issue will actually look like

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2019.02.08. 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 Issues with outdated version will be rejected.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 2019.02.08

Before submitting an issue make sure you have:

• 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

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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The following sections concretize particular purposed issues, you can erase any section (the contents between triple ---) not applicable to your issue

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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 ```):

$ youtube-dl -v -f 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/bestvideo+bestaudio' https://youtu.be/5IpYOF4Hi6Q
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '-f', 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/bestvideo+bestaudio', 'https://youtu.be/5IpYOF4Hi6Q']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.01.17
[debug] Python version 3.5.3 (CPython) - Linux-4.18.0-0.bpo.1-amd64-x86_64-with-debian-9.6
[debug] exe versions: ffmpeg 3.2.12-1, ffprobe 3.2.12-1, phantomjs 2.1.1, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] 5IpYOF4Hi6Q: Downloading webpage
[youtube] 5IpYOF4Hi6Q: Downloading video info webpage
[youtube] {18} signature length 44.41, html5 player vflYv1bWD
[youtube] {36} signature length 44.41, html5 player vflYv1bWD
[youtube] {17} signature length 44.41, html5 player vflYv1bWD
[youtube] {137} signature length 44.41, html5 player vflYv1bWD
[youtube] {248} signature length 44.41, html5 player vflYv1bWD
[youtube] {136} signature length 44.41, html5 player vflYv1bWD
[youtube] {247} signature length 44.39, html5 player vflYv1bWD
[youtube] 5IpYOF4Hi6Q: Downloading player https://www.youtube.com/yts/jsbin/player_ias-vflYv1bWD/en_US/base.js
[youtube] {398} signature length 44.41, html5 player vflYv1bWD
[youtube] {135} signature length 44.41, html5 player vflYv1bWD
[youtube] {244} signature length 44.41, html5 player vflYv1bWD
[youtube] {397} signature length 44.41, html5 player vflYv1bWD
[youtube] {134} signature length 44.41, html5 player vflYv1bWD
[youtube] {243} signature length 44.41, html5 player vflYv1bWD
[youtube] {396} signature length 44.41, html5 player vflYv1bWD
[youtube] {133} signature length 44.41, html5 player vflYv1bWD
[youtube] {242} signature length 44.41, html5 player vflYv1bWD
[youtube] {395} signature length 44.41, html5 player vflYv1bWD
[youtube] {160} signature length 44.41, html5 player vflYv1bWD
[youtube] {278} signature length 44.41, html5 player vflYv1bWD
[youtube] {394} signature length 44.41, html5 player vflYv1bWD
[youtube] {140} signature length 44.41, html5 player vflYv1bWD
[youtube] {171} signature length 44.41, html5 player vflYv1bWD
[youtube] {249} signature length 44.41, html5 player vflYv1bWD
[youtube] {250} signature length 44.41, html5 player vflYv1bWD
[youtube] {251} signature length 44.41, html5 player vflYv1bWD
[debug] Invoking downloader on 'https://r11---sn-4gxx-25ge7.googlevideo.com/videoplayback?itag=398&ms=au%2Conr&initcwndbps=517500&mv=m&dur=229.028&mt=1549732573&id=o-AJYAPaCr0XZfsTIGN609cYyaqXKQXUMPVWnapae4T25n&sparams=aitags%2Cclen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cnh%2Cpcm2cms%2Cpl%2Crequiressl%2Csource%2Cexpire&pl=39&mn=sn-4gxx-25ge7%2Csn-h5q7knel&ip=2a01%3Ae34%3Aee1e%3A860%3A6f23%3A82e6%3Aaa2d%3Abbd1&mm=31%2C26&txp=5511222&ei=MQtfXOiNBYmUV-vdhugP&key=yt6&c=WEB&ipbits=0&pcm2cms=yes&aitags=133%2C134%2C135%2C136%2C137%2C160%2C242%2C243%2C244%2C247%2C248%2C278%2C394%2C395%2C396%2C397%2C398&source=youtube&clen=3343862&nh=EAE%2C&lmt=1540741849966584&expire=1549754257&keepalive=yes&fvip=4&gir=yes&mime=video%2Fmp4&requiressl=yes&signature=AC1C82BC491833CF6D68C64AF2E0FE79489955D0.9CBBB4D3A56B26F92EDAA17D9E8F2EFA63451BEF&ratebypass=yes'
[download] Destination: pink floyd - another brick in the wall-5IpYOF4Hi6Q.f398.mp4
[download] 100% of 3.19MiB in 00:07
[debug] Invoking downloader on 'https://r11---sn-4gxx-25ge7.googlevideo.com/videoplayback?itag=140&ms=au%2Conr&initcwndbps=517500&mv=m&dur=229.088&mt=1549732573&id=o-AJYAPaCr0XZfsTIGN609cYyaqXKQXUMPVWnapae4T25n&sparams=clen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cnh%2Cpcm2cms%2Cpl%2Crequiressl%2Csource%2Cexpire&pl=39&mn=sn-4gxx-25ge7%2Csn-h5q7knel&ip=2a01%3Ae34%3Aee1e%3A860%3A6f23%3A82e6%3Aaa2d%3Abbd1&mm=31%2C26&txp=5533432&ei=MQtfXOiNBYmUV-vdhugP&key=yt6&c=WEB&ipbits=0&pcm2cms=yes&source=youtube&clen=3639158&nh=EAE%2C&lmt=1540739772838777&expire=1549754257&keepalive=yes&fvip=4&gir=yes&mime=audio%2Fmp4&requiressl=yes&signature=A75AEE07F24E9D833862D6B989C028E42D1D193C.E39600421F2D99D0ABC25048DD39F5023229CAF3&ratebypass=yes'
[download] Destination: pink floyd - another brick in the wall-5IpYOF4Hi6Q.f140.m4a
[download] 100% of 3.47MiB in 00:02
[ffmpeg] Merging formats into "pink floyd - another brick in the wall-5IpYOF4Hi6Q.mp4"
[debug] ffmpeg command line: ffmpeg -y -i 'file:pink floyd - another brick in the wall-5IpYOF4Hi6Q.f398.mp4' -i 'file:pink floyd - another brick in the wall-5IpYOF4Hi6Q.f140.m4a' -c copy -map 0:v:0 -map 1:a:0 'file:pink floyd - another brick in the wall-5IpYOF4Hi6Q.temp.mp4'
ERROR:     Last message repeated 1 times
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/youtube_dl/YoutubeDL.py", line 2048, in post_process
    files_to_delete, info = pp.run(info)
  File "/usr/lib/python3/dist-packages/youtube_dl/postprocessor/ffmpeg.py", line 491, in run
    self.run_ffmpeg_multiple_files(info['__files_to_merge'], temp_filename, args)
  File "/usr/lib/python3/dist-packages/youtube_dl/postprocessor/ffmpeg.py", line 217, in run_ffmpeg_multiple_files
    raise FFmpegPostProcessorError(msg)
youtube_dl.postprocessor.ffmpeg.FFmpegPostProcessorError:     Last message repeated 1 times

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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=BaW_jenozKc
• Single video: https://youtu.be/BaW_jenozKc
• Playlist: https://www.youtube.com/playlist?list=PL4lCao7KL_QFVb7Iudeipvc2BCavECqzc

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

Explanation of your issue in arbitrary form goes here. Please make sure the description is worded well enough to be understood. Provide as much context and examples as possible.
If work on your issue requires account credentials please provide them or explain how one can obtain them.

[dstftw]

Outdated ffmpeg.