chromaprint | C library for generating audio fingerprints used by AcoustID | Audio Utils library

Try this (the short clip inserted at 3-second mark):

The forfiles command is a nasty beast, because there are several caveats:

• it is slow (particularly because it cannot run internal commands of the hosting command prompt);
• it handles wildcards differently than most other commands, hence /M *.* does not match all files but only such with an extension; to really match all files, use /M * or skip it since it is the default anyway;
• it applies backslash-escaping, which is particularly annoying with paths ending in \, like the root directory of a drive /P "D:\", which causes a syntax error since the closing quotation mark is considered as escaped; to work around that, preferably append a . like /P "D:\.", or remove the quotation marks like /P D:\, though this exposes potential whitespaces or special characters to the parser;
• all of the special @-variables that return the path and/or name of iterated items provide the values in quoted manner, which is particularly frustrating when it comes to concatenation;
• it iterates over both files and directories that match the given mask; to distinguish between them you could use the special @isdir variable, but you will need an if statement for this (like if @isdir==FALSE or if @isdir==TRUE), which is an internal cmd.exe command, requiring its explicit instantiation even when you would not need it else;
• handling of the command behind /C and its arguments is terribly implemented, leading to the problem that directly running external commands (so without cmd /C) may fail, unless you are aware of the mostly working fix by stating the command name twice (like /C "command.exe command.exe --parameter argument");
• even its basically nice /D option (which is the only reason why forfiles might suit better than for) to filter for the relative last modification date (but not time) is badly implemented when a positive number (like /D +1) is used, because this uselessly points to the future;

All of these issues lead me to the point that I suggest not to use forfiles and to use a standard for loop instead, like this (note also the changed mask *.flac):

• In a batch-file:

The source of the differences is that FFprobe counts the discarded packets, and FFmpeg doesn't count the discarded packets as frames.

Your results are consistent with video stream that is created with 3 B-Frames (3 consecutive B-Frames for every P-Frame or I-Frame).

According to Wikipedia:

I‑frames are the least compressible but don't require other video frames to decode.
P‑frames can use data from previous frames to decompress and are more compressible than I‑frames.
B‑frames can use both previous and forward frames for data reference to get the highest amount of data compression.

When splitting a video with P-Frame and B-Frame into segments without re-encoding, the dependency chain breaks.

• There are (almost) always frames that depends upon frames from the previous segment or the next segment.
• The above frames are kept, but the matching packets are marked as "discarded" (marked with AV_PKT_FLAG_DISCARD flag).

For the purpose of working on the same dataset, we my build synthetic video (to be used as input).

Building synthetic video with the following command:

Your input is detected as interlaced but with half-height (288) and double the framerate (50). This may be due to missing or unrecognized boundary markers in the JPEG2000 packets. I assume this is meant to be PAL --> 720x576@25i.

Try using the tinterlace filter first to interleave the input "frames" to double-height and half fps, and then continue the original sequence of filters.

"tinterlace=mode=merge,bwdif=0,select='if(eq(n\,0),1,floor(t)-floor(prev_selected_t))'"

Okay, for the love of God Im done... needed 4 days for that **** to find out, I had an apache mod activated (fcgid) which literally assign every single line of ur code to a single thread... so I deactivated that one and now its working without any issues...

So in short - what I did:

MP4s may have an edit list which tell the player to construct a virtual playback timeline. Occasionally, this timeline can leave out frames needed to decode stream correctly, or the sync samples table may be wrong.

Add -ignore_editlist to demux the stream without any edits.

ffmpeg.exe -ignore_editlist 1 -i vlc-record-2021-06-07-08h01m03s-rtsp___192.168.178.92_554_h265Preview_01_main-.mp4 output/%05d.jpg

So what happened is that the library in Debian providing support for live555 was removed in February of this year, this affects all downstream distros including but not limited to RPi OS and Ubuntu:

https://askubuntu.com/a/1363113

The 2 active versions were 2020.01.19-1 and 2018.11.26-1.1, Live555 has since added GPL license headers to the offending files, however the RFC issue remains.

Now you may be tempted to just download the latest Live555 source code and compile it... it does not work. There have been changes to function names and structures referenced by VLC, and as such VLC will not compile against the source. You need to get an older version, I specifically used this one, which is a tweaked snapshot from 2020 prior to the modifications that prevent VLC compilation:

https://github.com/rgaufman/live555

The configuration you want is ./genMakefiles linux-with-shared-libraries, I do not know if it is required but since my system is x86-64-bit I added -m64 to the compiler options first

After compilation and install, I went on to compile VLC, adding '--enable-live555' and '--with-live555-tree=extras/live555-master' after placing the root Live555 folder in the VLC extras folder, however VLC failed to compile, it turns out the Live555's make install does not copy all the header files needed to where VLC is looking. They were dropped as 4 subfolders into /usr/local/include/, and the actual libs into /usr/local/lib/. Adding the correct CXX/CPP flags will make it look where they were put, however I put them all in a single folder and used 1 flag.

I also had to '--disable-mod' to work around a dependency version issue that I had no interest in fixing, since I do not use modplug or any mod files.

50 minutes later... VLC successfully compiled! However it was expecting the libraries for Live555 to be in /usr/lib/ not /usr/local/lib/, since it took so long to compile I was just fine with linking or copying the libraries into the expected folder, and after that VLC works with RTSP when linked to the new file. Or you can choose to maintain the original VLC and run the new file directly if you need to load the camera feeds.

If you are reading JPEGs, PNGs, or video into OpenCV, it will hold them in memory in BGR channel ordering. If you are feeding such frames into ffmpeg you must either:

• convert the frames to RGB first inside OpenCV with cv2.cvtColor(... cv2.COLOR_BGR2RGB) before sending to ffmpeg, or
• tell ffmpeg that the frames are in BGR order by putting -pix_fmt bgr24 before the input specifier, i.e. before -i -

Stream #0:1 is unknown data, but the MP4 muxer does not know what to do with that.

• Map only the video by changing -map 0 to -map 0:v.
• Or keep -map 0 and omit the data stream by adding -map -0:d.

See FFmpeg Wiki: Map.