[FFmpeg-trac] #551(avformat:new): Enhancements for ffmpeg 0.6.3 when dealing with live H264 stream

[FFmpeg]

#551: Enhancements for ffmpeg 0.6.3 when dealing with live H264 stream
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             Reporter:  ilevin       |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  minor        |                Component:  avformat
              Version:  unspecified  |               Resolution:
             Keywords:  H264         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by ilevin):

 "max NALU size" was required in my project to be reported to the streamer,
 thus it will know whether transcoding is needed depending on remote end
 SDP negotiated abilities. For example, when streaming over network with
 MTU 1500, and negotiated mode 0 (disallowing fragmentation for H264
 payload), transcoding is required if there is any NALU greater than 1468
 in the stream. In my project, decision about switching transcoding on or
 off has to be taken upfront, thus knowing the maximum NALU size in all the
 packets in the stream is crucial.
  "btrt" box serves similar purpose - we have restricted requirements on
 the high limits of the bit rate in the stream, and need to know maximum
 stream bit rate in a sliding window of a second upfront to decide whether
 trans-rating is required.
  "udta" on a stream level may hold an SDP information in sub boxes, and we
 were required to utilize that info if it existed.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/551#comment:2>
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