BtbN changed the topic of #ffmpeg to: Welcome to the FFmpeg USER support channel | Development channel: #ffmpeg-devel | Bug reports: https://ffmpeg.org/bugreports.html | Wiki: https://trac.ffmpeg.org/ | This channel is publically logged | FFmpeg 7.0 is released
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<ePirat>
StephenLynx, I had already told you to pass the options to avformat_write_header()
<StephenLynx>
that didn't work.
<ePirat>
well your issues lies elsewhere
<StephenLynx>
also, i read the source code, the loop is checked on tail.
<StephenLynx>
trailer*. and I didn't manage to get the trailer to write.
<ePirat>
yes, like I said your issues evidently lies elsewhere, not with passing the options
<StephenLynx>
maybe the header sets the options first and then they get written when writing the trailer?
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<ePirat>
avformat_write_header initialized the muxer so thats where the options need to be given
<StephenLynx>
I see.
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<StephenLynx>
now, what about streams? when you use write header, it requires a stream to be there.
<StephenLynx>
but at the same time, I manage to remux the whole image without streams.
<ePirat>
yeah you need create a new stream with avformat_new_stream, set the codec parameters with avcodec_parameters_copy before you call the write_header function
<ePirat>
and avio_open(&out_avfctx->pb, filepath, AVIO_FLAG_WRITE); before the write header too of course, else there is nowhere to write
<johnjaye>
Would I be correct in assuming ffmpeg has no way to "just" combine arbitrary audio files?
<johnjaye>
I can convert both files to mp3 and use the concat filter. But I can't just feed 2 arbitrary audio files in and combine them
<furq>
the concat filter does exactly that
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<furq>
you might need to change sample rate, channel count etc but you can do that in the same filterchain
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<StephenLynx>
ePirat, im getting "Invalid argument" when I try to write the trailer. I wonder if it's rejecting the loop value.
<StephenLynx>
hm, no. I sent null instead of the dictionary and I get the same issue.
<StephenLynx>
i think the issue is here if (!gif->prev_pkt)
<StephenLynx>
it's the only case it returns EINVAL
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<StephenLynx>
alright. I had to use av_interleaved_write_frame instead of directly writing the data.
<StephenLynx>
the gif now is a bit glitchy tho, it spits some warnings and is too fast.
<StephenLynx>
>Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
<StephenLynx>
but I made progress and got some more insight.
<StephenLynx>
heaven knows I need insight for this.
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<StephenLynx>
alright ,I set some stuff on the package and now it works. the checksum is not the same as the one ffmpeg produces, but the size is idental.
<StephenLynx>
identical.
<StephenLynx>
so yeah, go me. took me a week and some raging but I cracked it.
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<johnjaye>
furq: i don't think so as these were 2 m4a files clipped from a single source
<johnjaye>
so channel rate and such shouldn't matter
<johnjaye>
essentially i wanted to remove the segment of the file from t1 to t2
<johnjaye>
so I clipped the ends and combined them. or tried to
<johnjaye>
i assumed there's some reason concat wouldn't work with m4a but would mp3
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<ePirat>
johnjaye, the concat filter should work, maybe thats not what you actually used though? ffmpeg has various ways to concat only one of them being the filter
<ePirat>
would help if you show what you did
<johnjaye>
first i tried filter_complex. that didn't work
<johnjaye>
then I tried concat with a txt file and that didn't work either
<johnjaye>
i.e. a filename that said file a.m4a file b.m4a and then
<johnjaye>
as for the filter_complex command I don't recall exactly what I did
<johnjaye>
it was something like ffmpeg -i a.m4a -i b.m4a -filter_complex "[0:a] [1:a] concat=n=2:a=1 [a]" -map "[a]" output.m4a
<ePirat>
that should work
<johnjaye>
it says Stream specifier ':a' in filtergraph description [0:a] [1:a] concat=n=2:a=1 [a] matches no streams.
<ePirat>
johnjaye, you need to use: concat=n=2:v=0:a=1
<ePirat>
else concat expects a video stream
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<johnjaye>
amazing, that worked!
<johnjaye>
i had absolutely no idea from the error or the doc that was the problem
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<noobaroo>
When I Google "mp4 vs mkv" i get a lot of junk that is meant for stupid people and obviously stupid itself
<noobaroo>
Stuff saying "mkv is higher quality and bigger file size due to being less compressed"
<DeHackEd>
that's not true at all... mkv is a container. it provides features like chapters and probably supports more codecs, but the file size and compression is a codec thing, not a container thing
<noobaroo>
That might be the case often times but it's completely irrelevant to the question, it's just a coincidence
<DeHackEd>
that is horrible
<noobaroo>
Yup. So I want some legitimate answers but I'm not smart enough to skim through source code. I found this http://forum.doom9.org/showthread.php?t=183085 . What are the differences between mkv vs mp4 when it comes to seeking and timestamps, etc?
<ePirat>
johnjaye, I will try to get the error message for this case to be more helpful
<ePirat>
it is indeed not quite clear
<noobaroo>
Like, a moov atom can't be moved to the beginning until the end of encoding. So it is unplayable until the end. And if something kills the process midway, the entire first half of the file is lost forever with no surefire way to repair. Whereas an mkv plays even while encoding
<noobaroo>
And according to the linked forum: "There are no timestamps in mkv. DTS is not used, like in mp4 or mpeg-ts and instead of PTS durations are used with JUST millisecond precision (last thing is fixable at least)."
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<johnjaye>
ePirat: ah thanks that would be amazing.
<johnjaye>
just to be clear, concat method is "demuxing" right?
<ePirat>
what do you mean?
<johnjaye>
meaning. both audio streams are dumped into a container, but no effort is made to join them as a single stream?
<johnjaye>
but the filter_complex did the reencode to one full stream?
<johnjaye>
this is what the stackexchange answer I was following said
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<ePirat>
with the concat filter you do the whole journey, demux, decode, concat, encode, mux
<johnjaye>
oh. ok
<ePirat>
whereas the other you mentioned is just the concat demuxer, if you use that with -codec copy it will not re-encode.
<johnjaye>
what's it called what i described, where you sort of have 2 different streams sitting in 1 container? or is that not a thing for m4a?
<johnjaye>
I did
<johnjaye>
-c copy
<ePirat>
it will still remux so its one stream in the output
<johnjaye>
ok i think i understand. i vaguely recall there's some mode where mp3 files are simply strung together
<johnjaye>
sort of like 'cat file1 file2 > file3'. but i wasn't sure what it was called
<ePirat>
some container formats can tolerate that to a degree, yeah
<ePirat>
(not the case for m4a)
<johnjaye>
fascinating
<johnjaye>
the different container formats seem so impenetrable and complicated. I don't know much about their abilities
<johnjaye>
as the previous poster said, I'm stuck in the zone of being smart enough to ask the question but not smart enough to comprehend the answer or discover it.
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<StephenLynx>
also, a question about memory alignment. how do I figure which value to use? I looked around and saw 32, which did work my system. but I also read that it can vary between systems.
<StephenLynx>
and apparently between formats. gif requires 4, but I was using 1 just fine for jpg and png.
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<BtbN>
That's where that warning comes from, and you seen what alingment it wants, in which case
<StephenLynx>
I see a binary and with 15? I guess?
<StephenLynx>
im not too versed in lower level programming.
<StephenLynx>
so im gonna assume if it uses 15, either 16 or 32 works.
<BtbN>
It's easier to think of it in hex
<StephenLynx>
yeah.
<StephenLynx>
15 is the last hex value, then it loops to 0.
<BtbN>
0xf, so the first byte has to be 0 for the check to pass
<BtbN>
i.e. it's at least 16 byte aligned
<BtbN>
the first half-byte I mean
<StephenLynx>
right, but the question is, how do you figure this out without looking up the source code?
<StephenLynx>
what if im not using ARCH_X86
<BtbN>
increase the alignment until it stops complaining
<StephenLynx>
or is memory alignment only an issue here?
<BtbN>
Then it doesn't warn
<BtbN>
SSE and MMX obviously only exist on x86
<StephenLynx>
what if someone wants to write portable code and doesn't have access to other archs?
<DeHackEd>
another opinion... AVFrame has a different memory allocation function, av_frame_get_buffer, with an automatic alignment option. you could use that... but are you not using AVFrame objects?
<BtbN>
Then they'll find out whenever someone runs the code on x86
<StephenLynx>
ok, ill check that out, DeHackEd
<StephenLynx>
ty
<DeHackEd>
according to the code it just defaults to 32, which might be excessive depending on the hardware since it's just a constant and probably set to something maximally safe....
<BtbN>
32 is safe as long as no avx512 is thrown into the mix
<BtbN>
then you need 64
<StephenLynx>
yup, that worked great and it removed the need to manually freeing the memory.
<StephenLynx>
ok, so no more worrying about that.
<BtbN>
If you manually allocate a frame, under normal conditions you also need to free it
<StephenLynx>
also, valgrind complained about AVDictionary *opts; so I changed to initialize it to 0. should I be concerned in either case?
<StephenLynx>
valgrind didn't point out any leaks with av_frame_get_buffer.
<StephenLynx>
while it would point out a leak with av_image_alloc if I didn't free it.
<StephenLynx>
so probably get buffer sets something that lets av_frame_free free it maybe.
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<DeHackEd>
when you pass a dictionary to the various option-collecting functions like avformat_write_header, it pulls out options applicable to itself and leaves behind unrecognized options. if anything was left behind, you have bad options.
<ePirat>
StephenLynx, an AVDictionary needs to be initialised to NULL, which represents an empty dict.
<StephenLynx>
so not initializing it can cause issues?
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<BtbN>
not initializing anything is just a bad idea
<BtbN>
cause it'll be random junk
<StephenLynx>
yeah.
<StephenLynx>
i remember having issues like that in the past.
<StephenLynx>
ok, so to NULL then.
<BtbN>
You should look at the dict documentation and see how to use it properly
<DeHackEd>
uninitialized will be a junk pointer. I'm surprised it didn't just crash.
<BtbN>
not just guess
<ePirat>
DeHackEd, same…
<StephenLynx>
at least valgrind picks up on that kind of stuff.
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