A few things: Run the command ffmpeg -codecs to list the codecs your ffmpeg build supports h264 and mp3 are compression standards, but do not really identify a specific encoder. The H.264 encoder that ffmpeg uses is x264 and you will either have to use x264 or libx264 in your command line depending on what is listed in #1. The mp3 encoder is lame and usually is identified by something like libmp3lame You must have a version of ffmpeg that is built with support for these libraries since they are not directly part of ffmpeg.
If these codecs are not listed in ffmpeg -codecs you need to create or find a build that supports them.
A few things: Run the command ffmpeg -codecs to list the codecs your ffmpeg build supports. H264 and mp3 are compression standards, but do not really identify a specific encoder. The H.264 encoder that ffmpeg uses is x264 and you will either have to use x264 or libx264 in your command line depending on what is listed in #1.
The mp3 encoder is lame and usually is identified by something like libmp3lame. You must have a version of ffmpeg that is built with support for these libraries since they are not directly part of ffmpeg. If these codecs are not listed in ffmpeg -codecs you need to create or find a build that supports them.
Make sure you have enabled the 'h264' encoder while configuring the FFmpeg. 'h264' encoders comes under GPL.
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