Recherche avancée

Sur d’autres sites (3104)

• Prefer a monotonic clock source if available

  25 juin 2018, par Henrik Gramner

  Prefer a monotonic clock source if available
  

  • [DH] common/osdep.c
  • [DH] configure

• How to embed pic_timing SEI wall clock timecodes in RTMP streaming ?

  16 mai 2019, par MorenoGentili

  I need to stream my desktop to the AWS MediaLive service and, as a requirement, I must include wallclock timecodes in the stream. The AWS support kindly informed me that for h.264 encoded streams, I need to provide timecodes as "pic_timing SEI messages".

  I’m streaming with Ffmpeg via the RTMP protocol on Windows 10 so, I tried adding the use_wallclock_as_timestamps and copyts flags to my command.

  ffmpeg -f gdigrab -framerate 30 -offset_x 0 -offset_y 0 -video_size 1920x1080 -show_region 1 -use_wallclock_as_timestamps 1 -i desktop -vf scale=320:240 -c:v libx264 -c:a aac -profile:v main -level 3.1 -pix_fmt yuv420p -copyts -f flv rtmp://<ip>:1935/<app>/<stream>
  
  </stream></app></ip>

  However, the timecodes are not picked up by AWS MediaLive.

  My questions are :

  • Does the use_wallclock_as_timestamps flag actually create timecodes as "pic_timing SEI messages" as required ?
  • If not, how do I add wallclock timecodes as "pic_timing SEI messages" ? It doesn’t have to be every frame. Every 2 or 3 seconds would suffice.

  I’m stumped. I couldn’t find the answer in the Ffmpeg documentation.

  Thanks for your help.

• No member named 'clock' in the global namespace when using FFmpeg pod

  24 mai 2021, par Bobrovsky

  My app (iOS 7+, Xcode 6) uses CocoaPods for its dependencies. One of the dependencies is FFmpeg.

  



  When I build my app I get several similar looking issues like

  



  


  /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/ctime:60:9 :
 No member named 'clock' in the global namespace ; did you mean 'flock' ?

  


  



  I learned that this is because FFmpeg includes time.h file in libavutil subfolder. This time.h hides system time.h from the compiler and thus the errors.

  



  I tried to manually rename FFmpeg's time.h to something else and this helps. Now I want to do that automatically and in a way that will survive next 'pod update'.

  



  I tried to add libavutil to Sub-Directories to Exclude In Recursive Searches but this doesn't help at all.

  



  I tried to remove "$PODS_ROOT/Headers/Public/FFmpeg/libavutil" from Header Search Paths and it didn't help either.

  



  I know there are prepare_command and post_install hooks one can use in his Podfile but unfortunately I don't know if these are helpful in my case.

  



  So, how can I exclude time.h in libavutil of FFmpeg pod from header search paths (I don't mind to rename or even remove the time.h) ?