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• ffmpeg banner information for scale, preset and unsharp mask

  12 décembre 2019, par Brajesh

  I’m using ffmpeg with these three settings (scale, unsharp, preset) with different values, for example, the below could be scale of 1920, or a preset of veryfast etc.

  -vf scale=1280:720 unsharp=9:9:0.75:9:9:0.75 -preset superfast

  My question is, how can I look at the banner (the initial message ffmpeg displays when its running) to know what were the values of these three settings that I used ?

  I’m using a script to pass in the values, and I want to make sure that in the execution, the right value is being used and there is no error in my code.

  thank you

• How to play a part of the MP4 video stream ?

  14 novembre 2014, par AgentFire

  I have a URL (<ip>/ipcam/mpeg4.cgi</ip>) which points to my IP camera which is connected via Ethernet.
  Accessing the URL resuls in a infinite stream of video (possibly with audio) data.

  I would like to store this data into a video file and play it later with a video player (HTML5’s video tag is preferred as the player).

  However, a straightforward approach, which is simple saving the stream data into .mp4 file, didn’t work.

  I have looked into the file and here is what I saw (click to enlarge) :

  

  It turned out, there are some HTML headers, which I further on manually excluded using the binary editing tool, and yet no player could play the rest of the file.

  The HTML headers are :

  --myboundary
  
  Content-Type: image/mpeg4
  
  Content-Length: 76241
  
  X-Status: 0
  
  X-Tag: 1693923
  
  X-Flags: 0
  
  X-Alarm: 0
  
  X-Frametype: I
  
  X-Framerate: 30
  
  X-Resolution: 1920*1080
  
  X-Audio: 1
  
  X-Time: 2000-02-03 02:46:31
  
  alarm: 0000

  My question is pretty clear now, and I would like any help or suggestion. I suspect, I have to manually create some MP4 headers myself based on those values above, however, I fail to understand format descriptions such as these.

  I have the following video stream settings on my IP camera (click to enlarge) :

  

  I could also use the ffmpeg tool, but no matter how I try and mix the arguments to the program, it keeps telling me this error :

  

• How can I generate encoded HEVC bitstream using ffmpeg ?

  31 octobre 2014, par jgmao

  I am able to encoded YUV file to mp4 using HEVC :

  ffmpeg.exe -f rawvideo -s 1920x1080 -pix_fmt yuv420p -i input.yuv -c:v hevc -r 30 -x265-params crf=27 -vframes 300 -an -y test.mp4

  Here is the mp4box -info test.mp4 shows :

  * Movie Info *
  
          Timescale 1000 - Duration 00:00:10.000
  
          1 track(s)
  
          Fragmented File: no
  
          File suitable for progressive download (moov before mdat)
  
          File Brand isom - version 512
  
          Created: UNKNOWN DATE   Modified: UNKNOWN DATE File has no MPEG4 IOD/OD
  
  
  
  iTunes Info:
  
          Encoder Software: Lavf56.11.100
  
  
  
  Track # 1 Info - TrackID 1 - TimeScale 15360 - Media Duration 00:00:10.000 Track has 1 edit lists: track duration is 00:00:10.000 Media Info: Language "Undetermined" - Type "vide:hev1" - 300 samples Visual Track layout: x=0 y=0 width=1920 height=1080 MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x23 HEVC Video - Visual Size 1920 x 1080
  
          HEVC Info: Profile Main @ Level 5 - Chroma Format 1
  
          NAL Unit length bits: 32 - general profile compatibility 0x60000000
  
          Parameter Sets: 1 VPS 1 SPS 1 PPS
  
          SPS resolution 1920x1080
  
          Bit Depth luma 8 - Chroma 8 - 1 temporal layers

  But how can I get the decodeble bit stream ? I tried

   mp4box -raw 1 test.mp4 -out out.bin

  It gives :

  Extracting MPEG-H HEVC stream to hevc

  But the out.bin couldn’t be decoded by HM or elecard.

  Thanks