Deciphering Xuggle/ffmpeg errors (newbie)

I've recently started working with Xuggle to convert video files of various formats into corresponding FLVs (to be played on our site via jwplayer). The code I'm using is trivially simple; essentially what they show for the basic video conversion tutorial:

IMediaReader reader = ToolFactory.makeReader(file.getPath());
reader.addListener(ToolFactory.makeWriter(tempFileName, reader));

while (reader.readPacket() == null)
;

This works well for about 50% of the videos I've attempted. However, I get the following error for some videos (all .MP4s I've come across, as well as some .MOVs)

Caused by: j开发者_Python百科ava.lang.RuntimeException: Error Operation not permitted, failed to write header to container com.xuggle.xuggler.IContainer@-635072136[url:/tmp/1280786368521.flv;type:WRITE;format:com.xuggle.xuggler.IContainerFormat@-631842520[oname:flv;olongname:FLV format;omimetype:video/x-flv;oextensions:flv;];] while establishing stream com.xuggle.xuggler.IStream@-615272544[index:1;id:2;streamcoder:com.xuggle.xuggler.IStreamCoder@-677475184[codec=com.xuggle.xuggler.ICodec@-635131032[type=CODEC_TYPE_AUDIO;id=CODEC_ID_MP3;name=libmp3lame;];time base=1/48000;frame rate=0/0;sample rate=48000;channels=2;];framerate:0/0;timebase:1/90000;direction:OUTBOUND;]
        at com.xuggle.mediatool.MediaWriter.getStream(MediaWriter.java:1065)
        at com.xuggle.mediatool.MediaWriter.encodeAudio(MediaWriter.java:837)
        at com.xuggle.mediatool.MediaWriter.onAudioSamples(MediaWriter.java:1448)
        at com.xuggle.mediatool.AMediaToolMixin.onAudioSamples(AMediaToolMixin.java:89)
        at com.xuggle.mediatool.MediaReader.dispatchAudioSamples(MediaReader.java:628)
        at com.xuggle.mediatool.MediaReader.decodeAudio(MediaReader.java:555)
        at com.xuggle.mediatool.MediaReader.readPacket(MediaReader.java:469)
        ... 10 more

I'm having a hard time determining if the root cause for the error is related to the Xuggle/ffmpeg/lame/etc. installation, or whether there's an issue with my code.

I figure the first step is deciphering the error log and using that info to try to convert the video using native ffmpeg calls. If that works, I assume it's reasonable to believe that those components are installed correctly?

So for a log message like:

Error Operation not permitted, failed to write header to container com.xuggle.xuggler.IContainer@-635072136
[url:/tmp/1280786368521.flv;type:WRITE;format:com.xuggle.xuggler.IContainerFormat@-631842520[oname:flv;olongname:FLV format;omimetype:video/x-flv;oextensions:flv;];] 

while establishing stream com.xuggle.xuggler.IStream@-615272544
[index:1;id:2;streamcoder:com.xuggle.xuggler.IStreamCoder@-677475184[codec=com.xuggle.xuggler.ICodec@-635131032[type=CODEC_TYPE_AUDIO;id=CODEC_ID_MP3;name=libmp3lame;];time base=1/48000;frame rate=0/0;sample rate=48000;channels=2;];framerate:0/0;timebase:1/90000;direction:OUTBOUND;]

how would I translate that to a ffmpeg command?

any other debugging tips for this Xuggle newbie?

Problem solved. It was due to FLV only supporting audio streams with sample rates of 44.1, 22.05 & 11.025 kHz. Used Xuggle's IAudioResampler class from within a custom MediaTool listener listening to onAudioSamples() to resample the audio to a supported rate.

I also recently ran across this same issue. Spent couple of days on this till I found the answer here.