[rtmpdump] Discrepancies Between Dumped Video And Source Video

Nickolaus Padgett nick.padgett at gmail.com
Thu Jul 22 03:19:27 CEST 2010

On Wed, Jul 21, 2010 at 3:00 PM, Howard Chu <hyc at highlandsun.com> wrote:
>> 2) The source video is 74.1 MB on disk (74,139,578 bytes), however,
>> the RTMPdump video is 36.5 MB on disk (36,457,236 bytes).  Why is
>> this?  Are there elementary streams in the source video that are not
>> being transfered from the RTMP server?
> The metadata in your log certainly implies that there are two video and two
> audio streams.

I looked at the original source file and there are only two streams;
one audio and one video.  What other reasons would explain the drastic
difference in file size?  You can download the original source video
from http://static.playonsports.com.s3.amazonaws.com/example_expected.mp4.
 You can download the RTMPdump video from

>> 3) The RTMPdump video is not seekable, however, the source video is
>> seekable.
> Sounds like your player is broken. FLVs should always be seekable.

I used VLC 1.0.5 to play the video.  Try the actual link above and
seek to 75% into the video.

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