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• avutil/timer : Fix missing header for mach_absolute_time

  17 juin 2024, par Zhao Zhili

  avutil/timer : Fix missing header for mach_absolute_time
  mach/mach_time.h was included only when CONFIG_MACOS_KPERF wasn't
  
  been defined.
  Signed-off-by : Zhao Zhili <zhilizhao@tencent.com>
  

  • [DH] libavutil/timer.h

• [FFmpeg on Windows] : help me converting a set of .png files to a video file

  31 octobre 2016, par Stefano Fedele

  Hi everybody I am on windows 10, I installed FFMpeg and I would like to use it to convert 100 .png image files into a video file.

  I am using it via the prompt, which is the Windows console, and I am struggling with the syntax (which probability comes from Linux). I set the folder in which ffmpeg.exe is contained as a windows system path as suggested on many websites and I moved the prompt to the folders in which the image files are contained which is reported here :

  cd C:\video\pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain

  I would like to convert the image files contained in this folder into a video file, the names of those image files are reported here :

  pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain 20 001.png

  pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain 20 002.png

  ...

  ...

  pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain 20 100.png

  The number of frames per second whould be 2.

  I read on internet that I should have to type something like this

  ffmpeg -i image-%03d.png video.webm

  But it looks like there are a lot of variables to consider and all the times I try to set them and run FFmpeg I get an error from the prompt.
  Is there anyone who could suggest me the proper syntax, please ?

• (ffmpeg) How to sync dshow inputs, dropping frames, and -rtbufsize [closed]

  29 juillet 2021, par Zach Fleeman

  I wrote a quick batch script to capture anything from my Elgato HD60 Pro capture card, and while it works in some ways, I don't really understand how certain parameters are affecting my capture.

  


  Whenever I run this command without the -rtbufsize 2048M -thread_queue_size 5096 params, I drop a ton of frames. I only added those params with those values because I found them on another stackoverflow thread. I wouldn't mind actually knowing what these do, and how I can fine-tune them for my script.

  


  ffmpeg.exe -y -rtbufsize 2048M -thread_queue_size 5096 -fflags +igndts ^
-f dshow -i video="Game Capture HD60 Pro":audio="Game Capture HD60 Pro Audio" ^
-filter:v "crop=1410:1080:255:0, scale=706x540" ^
-c:v libx264 -preset veryfast -b:v 1500k -pix_fmt yuv420p ^
-c:a aac ^
-f tee -map 0:v -map 0:a "%mydate%_%mytime%_capture.mp4|[f=flv]rtmp://xxx.xxx.xxx.xxx/live"


  


  In Open Broadcaster Software, my Elgato is a near-instant video feed, but this captures/streams things at a 3-ish second delay, which is okay until I work on this second command. I'm using gdigrab to capture the window from LiveSplit for my speedrunning, but I can't get the video streams to be synced up. I tried adding and modifying another -rtbufsize before the gdigrab input, but again, I'm not sure if this is what I need to do to delay the LiveSplit grab. It seems to always be 2 to 3 seconds ahead of my capture card. How can I get these inputs to be synced and react at the same time ? i.e., I start the timer in LiveSplit at the same time that I hit a button on my super nintendo.

  


  ffmpeg.exe -y -rtbufsize 750M -thread_queue_size 5096 ^
-f dshow  -i video="Game Capture HD60 Pro":audio="Game Capture HD60 Pro Audio" ^
-rtbufsize 2000M -thread_queue_size 5096 ^
-f gdigrab -r 60 -i title=LiveSplit ^
-filter_complex "[0:v][0:v]overlay=255:0 [game];[game][1:v]overlay=0:40 [v]" ^
-c:v libx264 -preset veryfast -b:v 1500k -pix_fmt yuv420p ^
-c:a aac ^
-f tee -map "[v]" -map 0:a "%mydate%_%mytime%_capture.mp4|[f=flv]rtmp://192.168.1.7/live"


  


  tl ;dr
Where should I put -rtbufsize ? What value should it be ? And how about -thread_queue_size ? Are these things that I have to specify once or multiple times for each input ? How can I get my different input sources to sync up ?

  


  p.s., I'm cropping and overlaying my Elgato inputs because my capture card does 1920x1080, but my video is most likely a 4:3-ish SNES/NES game.