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I want to use FFMPEG to transcode my mp4 video for http streaming on Amazon S3 without downloading. However, with reference to this post, I still cannot get it streaming: 

ffmpeg -i input.avi -c:v libx264 -crf 22 -c:a libfaac -movflags faststart output.mp4

Reference: Creating MP4 videos ready for HTTP streaming

After uploaded to S3 and set it for public, changed content-type to "video/mp4", the video cannot be played as it said the file is corrupted. But if I download the file, it played smoothly. I tried the amzaon Eleastic Transcode, it can play back instantly without download, but the file size was trimmed to 1/10 so quality suffered.

I think there must be something I missed to get it stream via http. can any one help? thanks.

Regards, KC

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kclai
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    Always post the output on your console as well. That helps everyone to know how ffmpeg is treating your input. What I would try would be to add the parameter `-pix_fmt yuv420p` to your command line. This is a very common problem because `subsampling` of `444` or `422` does not work on most players. – Rajib Mar 31 '14 at 09:52
  • I checked the video was in yuv420p format already. I suddenly found that Firefox was causeing the issue: I have no problem with Chrome. So I think it's just a compatibility issue. – kclai Apr 03 '14 at 01:58

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