similar to: Creating a SEEKTABLE block during encoding

I think there is another major issue for me: In METADATA_BLOCK_STREAMINFO the field for the length is only 36 bit, that's not even half an hour at 40 MHz sample rate, resulting in that the encoder sets it to 0 for longer captures. In the seekpoint the sample number is 64 bit, which is more than enough. But how does the decoder handle the seektable when the total number of samples is unknown?

Op zo 13 okt 2024 om 22:33 schreef Stefan Oltmanns <stefan-oltmanns at gmx.net>: > > Is the seektable written at the beginning of the file in the metadata > block or can there also be a second metadata block at the end? > Only at the start of the file. > > If it's at the beginning, would it possible to reserve space for N seek > points and during encoding remember

Hi! I've been using a little C++ program I've written to encode flac files. The program does this in the usual way (I think), by inheriting a class from FLAC::Encoder::File, and passing it chunks of raw samples through process_interleaved()... Anyway, the program works beautifully, and I've now decided to try and add some metadata to the encoded flacs. Eventually, there will be vorbis

Am 14.10.24 um 09:11 schrieb Martijn van Beurden: > Op zo 13 okt 2024 om 22:33 schreef Stefan Oltmanns <stefan-oltmanns at gmx.net>: >> > >> >> The signal is the FM-modulated video signal of video tapes (like VHS). >> The idea is to capture the signal directly from the video head amplifier >> in the VCR and later demodulate/decode it in software, providing

Hi Martijn, Am 13.10.24 um 21:00 schrieb Martijn van Beurden: > > There's actually quite a lot of documentation for this. > > Please review https://xiph.org/flac/api/group__flac__stream__encoder.html#ga80d57f9069e354cbf1a15a3e3ad9ca78 > > I quote: >> SEEKTABLE blocks are handled specially. Since you will not know the >> values for the seek point stream offsets,

--- Avuton Olrich <avuton@gmail.com> wrote: > What I'd like to do: I'm using ecasound to record for 24 hour > periods, > which pipes the output directly to flac. I would like to be able to > decode sections of this (using until/skip) during recording/encoding. > > I understand currently that flac can't do this, unless I pipe into dd > to skip after decoding

Please excuse me, I haven't yet dug into the code too far. What I'd like to do: I'm using ecasound to record for 24 hour periods, which pipes the output directly to flac. I would like to be able to decode sections of this (using until/skip) during recording/encoding. I understand currently that flac can't do this, unless I pipe into dd to skip after decoding (which would be an

I first thought that it would be much better to create a single seek standard for FLAC. Then, I thought, why couldn't someone just create the optional SEEKTABLE data after an initial encode, if they need this data? Since the checksums are a part of the FLAC format (unlike Shorten), and these checksums are on the data stream, not the metadata, so any additional metadata shouldn't matter or

I've checked in code that supports a new metadata block called SEEKTABLE. Basically, it is an optional, arbitrarily-long list of seek points, by sample number and stream offset. I also added command-line options to flac so you can specify seek points by specific sample number and/or a specific number of evenly-spaced seek points. The table cost about 18 bytes per seek point. This seems to

Op zo 13 okt 2024 om 02:16 schreef Stefan Oltmanns <stefan-oltmanns at gmx.net>: > > I cannot find any clues in the documentation how to write a > seektable/reserve space for it. > Can someone help me out? > There's actually quite a lot of documentation for this. Please review https://xiph.org/flac/api/group__flac__stream__encoder.html#ga80d57f9069e354cbf1a15a3e3ad9ca78

Hi List, I recently was assigned a task to port FLAC Encoder to our embedded platform. Thanks to OO-like design of the libFLAC and throught documentation, that porting went like a charm. I had some problems with chmod/chown like routines while porting but I was able to safely remove that piece of code without any trouble. I have observed that the my application FLAC Encoder failes in

Am 16.10.24 um 15:15 schrieb Martijn van Beurden: > > But how should such a number be presented to the libFLAC user? You > suggested overwriting the streaminfo total_samples number, but > streaminfo always precedes the seektable, so the streaminfo metadata > block is already parsed by the application before the seektable is > even read. Also, I think it is quite hacky to not pass

Am 16.10.24 um 19:46 schrieb Martijn van Beurden: > libFLAC reads a file from start to back, and returns data to the > client as soon as it is done parsing. So, it first encounters a > streaminfo metadata block, sends that to the application, then starts > on the seektable etc. In fact, for a lot of applications, the seek > table is simply ignored because libFLAC uses it internally.

Am 14.10.24 um 16:30 schrieb Martijn van Beurden: > Op ma 14 okt 2024 om 16:06 schreef Stefan Oltmanns <stefan-oltmanns at gmx.net>: > > I meant that when seeking to a certain sample, the stream decoder can > in fact use the seektable despite not knowing a total number of > samples. Of course, players, especially with GUIs, have to deal with > not knowing a total number of

Op di 15 okt 2024 om 21:27 schreef Alistair Buxton <a.j.buxton at gmail.com>: > > I would like to see this kind of thing put into a secondary metadata block aimed specifically at SDR. This could be completely ignored by regular audio players - these files are not meant to be listened to anyway. I could probably figure out how to implement that, I even started looking into it once, but

Op wo 16 okt 2024 om 16:25 schreef Stefan Oltmanns <stefan-oltmanns at gmx.net>: > > Yes, overwriting the streaminfo total_samples number is a bit of a hack, > but it would only affect those files with more than 2^36 samples that > contains the special seek point, so no difference for the average flac user. > > Not sure how the applications actually read flac files, if they

Op ma 14 okt 2024 om 16:06 schreef Stefan Oltmanns <stefan-oltmanns at gmx.net>: > > Unfortunately that doesn't seem to be the case. I just made a capture > that is > 30 Minutes with total samples set to 0 and a seek table: All > players I tried cannot seek in the file and cannot determine it's > length: VLC, Celluloid and DeaDBeef > > I wondered why I can

Hello, I'm using flac to compress s signal data during capture. The sample rate is almost a thousands time higher compared to audio (40 MHz), resulting in a lot of data very quickly. I'm using the C API in my capturing application (mostly copy&paste directly from the example) and it works so far, but unfortunately for longer captures there is no seeking information. How can I tell

The attached patch adds the missing FLAC__metadata_object_seektable_*() functions from FLAC's metadata object methods (FLAC/metadata.h) to FLAC++'s SeekTable class. Of the 11 functions in the C API, only 4 are currently in the C++ API, this patch adds the missing 7. If this patch is ok, VorbisComment will be next. A quick look tells me only 5 out of 13

> From: Cristian Rodr?guez <crrodriguez at opensuse.org> > Sent: Sunday, May 6, 2012 8:24 AM > > El 05/05/12 02:23, Bastiaan Timmer escribi?: >> The attached patch adds the missing FLAC__metadata_object_seektable_*() >> functions from FLAC's metadata object methods (FLAC/metadata.h) to >> FLAC++'s SeekTable class. Of the 11 functions in the C API,