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• Editing a video by FFMPEG that is not recognized by some video sharing sites [closed]

  22 octobre 2024, par Ebrahim Mehri

  I have a video that was made by FFMPEG. The problem is that an old video sharing website named aparat.com does not recognize it. When I open it in Adobe Premiere, without changing any option, the resulting video is OK. I think I should downgrade my used Codecs in order to make it readable.

  


  Here's the video that doesn't open :

  


  Format                         : MPEG-4
Format profile                 : Base Media
Codec ID                       : isom (isom/iso2/avc1/mp41)
Overall bit rate mode          : Variable
Overall bit rate               : 508 kb/s
Writing application            : Lavf58.78.100
Format profile                 : High 4:4:4 Predictive@L5
Format settings                : CABAC / 4 Ref Frames
Format settings, CABAC         : Yes
Format settings, Reference fra : 4 frames
Codec ID                       : avc1
Encoding settings              : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=4 / threads=30 / lookahead_threads=5 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=23.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00


  


  and the working one :

  


  Format                         : MPEG-4
Format profile                 : Base Media / Version 2
Codec ID                       : mp42 (mp42/mp41)
Overall bit rate mode          : Variable
Overall bit rate               : 821 kb/s
TIM                            : 00:00:00:00
TSC                            : 25
TSZ                            : 1
Format                         : AVC
Format profile                 : Main@L5
Format settings                : CABAC / 4 Ref Frames
Format settings, CABAC         : Yes
Format settings, Reference fra : 4 frames
Format settings, GOP           : M=4, N=25


  


  How can I make it work ?

  


• Embedding SMPTE timecode into mpeg1/2 video (no audio)

  6 janvier 2014, par user3164141

  I am working on a task which a client requires smpte drop frame timecode to be embedded into an mpeg1/2 video that my software will capture and encode. I have had success with encoding using both openCV and ffmpeg (windows). What I am having trouble with is embedding timecode.

  I've spent about a month researching this and have not been able to come up with a solution.
  Is there software available that can do what I need ?

  In my head, I picture a video file without timecode and I open with a player. It displays time in hh:mm:ss:ms. Then I imagine a video with timecode would display time information as hh:mm:ss:ff. This is not the case. Many video players don't even support displaying timecode.

  How is timecode stored in mpeg1/2 files ? I had thought it was stored on a per frame basis and would be as simple as :

  frameToEncode->setTimecode(SMPTE_DROPFRAME, framenum);
  
  MPEGEncoder::encodeFrame(frameToEncode);

  I have scoured the internet for an answer to this. Maybe I'm searching with the wrong terms, but I cannot find a clear cut solution to simply embed timecode to my video file.

  I have tried to use ffmpeg for this but have not been able to confirm/deny my attempts. Is there software I can use that will tell me I have embedded timecode in my video file ? I have tried using adobe premiere pro and roxio creator pro with no success.

  Lastly, is what my client asking even possible ? Is it possible to embed timecode. I am stunned by the lack of information I have been able to find on this and am beginning to think what is required isn't even possible. If it is possible, is there a commercial or free sdk/library capable of this ?

  TL ;DR : I need to embed timecode into an mpeg1/2 video file which I am capturing and encoding on the fly. How is timecode stored in mpeg1/2 files ? As a global header ? Per frame ? Something else ? I need software that can verify embedded timecode exists. Is what the client asking even possible ? If so, is there a commercial or free SDK available that can accomplish my task ?

  Note : I would need a c/c++ library capable of embedding the timecode.

• rtmppkt : Handle extended timestamp field even for one-byte header

  5 mars 2014, par Martin Panter

  rtmppkt : Handle extended timestamp field even for one-byte header
  Related fix in "rtmpdump" :
  
  https://repo.or.cz/w/rtmpdump.git/commitdiff/79459a2
  Adobe’s RTMP specification (21 Dec 2012), section 5.3.1.3 ("Extended
  
  Timestamp"), says "this field is present in Type 3 chunks". Type 3 chunks are
  
  those with the one-byte header size.
  This resolves intermittent hangs and segfaults caused by the read function,
  
  and also includes an untested fix for the write function.
  The read function was tested with ABC (Australia) News 24 streams, however
  
  they are probably restricted to only Australian internet addresses. Some of
  
  the packets at the start of these streams seem to contain junk timestamp
  
  fields, often requiring the extended field. Test command :
  avplay rtmp ://cp81899.live.edgefcs.net/live/news24-med@28772
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavformat/rtmppkt.c
  • [DH] libavformat/rtmppkt.h