ffmpegX is one of the most useful tools in a content producer’s arsenal. It’s fast, easy, and powerful beyond belief. Unfortunately, it has the occasional error that may make you scream! When a client needs a video in a certain format and you are getting error messages, it isn’t fun.
One such error that I frequently encounter (especially when converting files to Flash Video) is this one:
Codec type mismatch for mapping #0.0 -> #0.0
See, normally video comes before audio in the layout and organization of a multimedia file. Sometimes though (and it’s happening more frequently), codec creators are switching things up for a bit of fun. They’re putting the audio first. I can only assume it’s somehow related to compression - but this switch causes ffmpegX to freak out and cease encoding.
Luckily, this is a one check-box fix. Simply open your file and navigate to the audio tab. Then check the box titled “Invert Mapping”. This will let ffmpegX know about the alternate structure of your file, and make the appropriate changes.
Below is a screenshot that highlights the audio tab with Invert Mapping selected.
Traditional FFmpeg, for *NIX platforms, offers this feature as well, albeit in a more complex manner. From the official documentation:
You can encode to several formats at the same time and define a mapping from input stream to output streams:
ffmpeg -i /tmp/a.wav -ab 64k /tmp/a.mp2 -ab 128k /tmp/b.mp2 -map 0:0 -map 0:0Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. ‘-map file:index’ specifies which input stream is used for each output stream, in the order of the definition of output streams.
Do you have a fix, tip, or trick that you want to share with our readers? Email us, our email address is editor (at( youmakemedia )dot) com.
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Comments
This tip was crucial in helping me encode flash. thanks a tonne
Hey thanks, this little tip saved me from going crazy! cheers
Tip of the hat. People like you keep the modern world spinning.
Thanks that little piece info made ffmpegx a great tool for grabbing live music from you tube.. converting flv->mp3. Thnaks
Thanks man. Would never have guessed that. Trying to encode Matroska to DVD, this fixed it. Cheers
Thanks for the invert mapping tip. You make my day brighter!
Hey,
I’m trying to convert a wmv format to mp4 format using ffmpegX. I’m using mac os x version 10.4. When I encoded it, it came up with this: Codec type mismatch for mapping #0.0 -> #0.0, so I took your advice above and checked the box but now it says this: Unsupported codec (id=74) for input stream #0.1.
What do I have to do to change it into an mp4?
Thanks
having the same problem as tarini! please help!
tarini and alice:
From what I’ve been able to find out wmv is only partially supported by ffmpegx and that’s why it’s saying the codec isn’t supported. It looks like we’ll have to wait for the developers to include better support.
That’s my understanding, at least. Maybe Chris will chime in later and clarify.
WMV is a wonky codec. VLC only JUST started supporting it, if that says anything. My suggestion? Spend $20 and buy VisualHub. I’ll be writing a review soon.
Aaargh! Why didn’t I search for this last night, instead of staying up until 6am banging my head against the desk…
Thank you!
Hey thanks. This is a great tip. Saved me a lot of time. Audio before video? Since when? Grrr.
Thank you so much! So simple!!!
Thank you so much! I really was starting to go crazy!
You’re a life saver!
Thanks! You save me lots of time.
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