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• ffmpeg-python extract a specific video stream, change its FPS and embed it back in the video

  19 mars 2021, par user972014

  I have a video containing several streams. A few data and one video.

  


  I need to extract the video stream, change the frame rate, embed it back in the video (or combine all stream back to an output file)

  


  If needed, this is the list of existing streams :

  


  I only need stream 0 and 5 (both video streams) Converted to 2 FPS. And stream 3 which is gpmd, which some irrelevant data format that I need to keep.

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\temp\video.360':
  Metadata:
    major_brand     : mp41
    minor_version   : 538120216
    compatible_brands: mp41
    creation_time   : 2020-09-08 16:35:49
  Duration: 00:00:28.13, start: 0.000000, bitrate: 66559 kb/s
    Stream #0:0(eng): Video: hevc (Main) (hvc1 / 0x31637668), yuvj420p(pc, bt709), 4096x1344 [SAR 1:1 DAR 64:21], 30036 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 29.97 tbc (default)
    Metadata:
      creation_time   : 2020-09-08 16:35:49
      handler_name    : GoPro H.265
      encoder         : GoPro H.265 encoder
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
    Metadata:
      creation_time   : 2020-09-08 16:35:49
      handler_name    : GoPro AAC
    Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
    Metadata:
      creation_time   : 2020-09-08 16:35:49
      handler_name    : GoPro TCD
    Stream #0:3(eng): Data: none (gpmd / 0x646D7067), 96 kb/s (default)
    Metadata:
      creation_time   : 2020-09-08 16:35:49
      handler_name    : GoPro MET
    Stream #0:4(eng): Data: none (fdsc / 0x63736466), 20 kb/s (default)
    Metadata:
      creation_time   : 2020-09-08 16:35:49
      handler_name    : GoPro SOS
    Stream #0:5(eng): Video: hevc (Main) (hvc1 / 0x31637668), yuvj420p(pc, bt709), 4096x1344 [SAR 1:1 DAR 64:21], 30019 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 29.97 tbc (default)
    Metadata:
      creation_time   : 2020-09-08 16:35:49
      handler_name    : GoPro H.265
      encoder         : GoPro H.265 encoder
    Side data:
      displaymatrix: rotation of nan degrees
    Stream #0:6(eng): Audio: pcm_s32be (in32 / 0x32336E69), 48000 Hz, 4 channels, s32, 6144 kb/s (default)
    Metadata:
      creation_time   : 2020-09-08 16:35:49
      handler_name    : GoPro AMB


  


• How to convert date format of text in m3u8 file ? [closed]

  30 décembre 2020, par Rekabet Kurumu

  I have a Flussonic media server. I'm transcoding RTMP into HLS and must edit the M3U8 file.

  


  Problem :
How to change the date part of a name in segments of an .m3u8 file ?

  


  If stream name is "sample" output will be foo.com/stream.m3u8 this is perfect. but inside m3u8 file outout looking like this

  


  #EXTM3U
#EXT-X-TARGETDURATION:5
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:20633
#EXT-X-PROGRAM-DATE-TIME:2020-12-30T11:15:07Z
#EXTINF:5.000,
2020/12/30/11/15/07-05000.ts?token=ADM1-1609326905-99fddfc3eb912171a5b85e553588a563704f5fb9
#EXTINF:5.000,
2020/12/30/11/15/12-05000.ts?token=ADM1-1609326905-99fddfc3eb912171a5b85e553588a563704f5fb9
#EXTINF:5.000,
2020/12/30/11/15/17-05000.ts?token=ADM1-1609326905-99fddfc3eb912171a5b85e553588a563704f5fb9


  


  output lookin 2020/12/30/11/15/ like this. i want this part will be microtime or time.

  


  For example :

  


  1609326905-05000.ts?token=99fddfc3eb912171a5b85e553588a563704f5fb9
1609327050-05000.ts?token=99fddfc3eb912171a5b85e553588a563704f5fb9
1609329450-05000.ts?token=99fddfc3eb912171a5b85e553588a563704f5fb9


  


  is it possible ?

  


• Trolls in trouble

  6 juin 2013, par Mans — Law and liberty

  Life as a patent troll is hopefully set to get more difficult. In a memo describing patent trolls as a “drain on the American economy,” the White House this week outlined a number of steps it is taking to stem this evil tide. Chiming in, the Chief Judge of the Court of Appeals for the Federal Circuit (where patent cases are heard) in a New York Times op-ed laments the toll patent trolling is taking on the industry, and urges judges to use powers already at their disposal to make the practice less attractive. However, while certainly a step in the right direction, these measures all fail to address the more fundamental properties of the patent system allowing trolls to exist in the first place.

  System and method for patent trolling

  Most patent trolling operations comprise the same basic elements :

  1. One or more patents with broad claims.
  2. The patents of (1) acquired by an otherwise non-practising entity (troll).
  3. The entity of (2) filing numerous lawsuits alleging infringement of the patents of (1).
  4. The lawsuits of (3) targeting end users or retailers.
  5. The lawsuits of (3) listing as plaintiffs difficult to trace shell companies.

  The recent legislative actions all take aim at the latter entries in this list. In so doing, they will no doubt cripple the trolls, but the trolls will remain alive, ready to resume their wicked ways once a new loophole is found in the system.

  To kill a patent troll

  As Judge Rader and his co-authors point out in the New York Times, “the problem stems largely from the fact that, [...] trolls have an important strategic advantage over their adversaries : they don’t make anything.” This is the heart of the troll, and this is where the blow should be struck. Our weapon shall be the mightiest judicial sword of all, the Constitution.

  The United States Constitution contains (in Article I, Section 8) the foundation for the patent system (emphasis mine) :

  The Congress shall have Power [...] To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries.

  Patent trolls are typically not inventors. They are merely hoarders of other people’s discarded inventions, and that allowing others to reap the benefits of an inventor’s work would somehow promote progress should be a tough argument. Indeed, it is the dissociation between investment and reward which has allowed the patent trolls to rise and prosper.

  In light of the above, the solution to the troll menace is actually strikingly simple : make patents non-transferable.

  Having the inventor retain the rights to his or her inventions (works for hire still being recognised), would render the establishment of non-practising entities, which most trolls are, virtually impossible. The original purpose of patents, to protect the investment of inventors, would remain unaffected, if not strengthened, by such a change.

  Links

  • Taking on Patent Trolls to Protect American Innovation
  • Fact Sheet : White House Task Force on High-Tech Patent Issues
  • Make Patent Trolls Pay in Court
  • Constitution of the United States