[rtmpdump] Discrepancies Between Dumped Video And Source Video

[Nickolaus Padgett]

Thanks for the ffprobe example.  I was using vlc and yamb, neither
tool provided that level of detail.  I will speak with the video
creator.

As a side note, I uploaded the video dumped by RTMPdump to my CDN and
downloaded it for a second time.  This time, the file was byte for
byte the same file as the original; exactly what I was expecting
RTMPdump to do.

On Wed, Jul 21, 2010 at 9:55 PM, Howard Chu <hyc at highlandsun.com> wrote:
> Nickolaus Padgett wrote:
>>
>> On Wed, Jul 21, 2010 at 9:41 PM, Howard Chu<hyc at highlandsun.com>  wrote:
>>>>
>>>> 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 are quite mistaken. There are 6 streams in that file.
>>>
>>> ffprobe example_expected.mp4
>>> FFprobe version SVN-r24034, Copyright (c) 2007-2010 the FFmpeg developers
>>>  built on Jul  6 2010 11:27:54 with gcc 4.4.3
>>>  configuration: --enable-librtmp --extra-libs='-lrtmp -lssl -lcrypto'
>>> --enable-libx264 --enable-libfaac --enable-gpl --enable-nonfree
>>> --enable-pthreads --enable-libxvid --enable-libmp3lame
>>> --disable-encoder=aac
>>>  libavutil     50.20. 0 / 50.20. 0
>>>  libavcodec    52.79. 1 / 52.79. 1
>>>  libavformat   52.73. 0 / 52.73. 0
>>>  libavdevice   52. 2. 0 / 52. 2. 0
>>>  libavfilter    1.20. 1 /  1.20. 1
>>>  libswscale     0.11. 0 /  0.11. 0
>>> [mov,mp4,m4a,3gp,3g2,mj2 @ 0x1d230a0] Could not find codec parameters
>>> (Data:
>>> rtp  / 0x20707472, 67 kb/s)
>>> [mov,mp4,m4a,3gp,3g2,mj2 @ 0x1d230a0] Could not find codec parameters
>>> (Data:
>>> rtp  / 0x20707472, 440 kb/s)
>>> [mov,mp4,m4a,3gp,3g2,mj2 @ 0x1d230a0] Could not find codec parameters
>>> (Data:
>>> mp4s / 0x7334706D, 0 kb/s)
>>>    Last message repeated 1 times
>>> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'example_expected.mp4':
>>>  Metadata:
>>>    major_brand     : mp42
>>>    minor_version   : 1
>>>    compatible_brands: isommp41avc1
>>>  Duration: 00:09:59.39, start: 0.000000, bitrate: 128 kb/s
>>>    Stream #0.0(eng): Data: rtp  / 0x20707472, 67 kb/s
>>>    Stream #0.1(eng): Data: rtp  / 0x20707472, 440 kb/s
>>>    Stream #0.2(eng): Video: h264, yuv420p, 480x360 [PAR 1:1 DAR 4:3], 411
>>> kb/s, 29.97 fps, 29.97 tbr, 2997 tbn, 59.94 tbc
>>>    Stream #0.3(eng): Audio: aac, 44100 Hz, stereo, s16, 64 kb/s
>>>    Stream #0.4(eng): Data: mp4s / 0x7334706D, 0 kb/s
>>>    Stream #0.5(eng): Data: mp4s / 0x7334706D, 0 kb/s
>>
>> Can RTMPdump be configured or modified to record these additional streams?
>>
> rtmpdump records what the RTMP server sends. Nothing less, nothing more.
> I'll say it again, one last time: none of what you're asking about has
> anything to do with rtmpdump. Go talk to whoever provided your video data.
>