[FFmpeg-user] [help]What are the parameter of compression ration, and Slow 1x, 2x, 3x , Also with Fast
Hello,
For Android:-
I'd like to know the parameter of the video Compression ratio with default
orientation.
Currently, I am using for Compress video
(-y", "-i", yourRealPath, "-s", "160x120", "-r", "25", "-vcodec",
"mpeg4", "-b:v", "150k", "-b:a", "48000", "-ac", "2", "-ar", "22050",
filePath)
*-- Using this for Fast need parameter which help to set 1x 2x 3x fast*.
{"-y", "-i", yourRealPath, "-filter_complex",
"[0:v]setpts=0.5*PTS[v];[0:a]atempo=2.0[a]", "-map", "[v]", "-map",
"[a]", "-b:v", "2097k", "-r", "60", "-vcodec", "mpeg4", filePath}
*-- Using this for Slow need parameter which help to set 1x 2x 3x Slow. *
{"-y", "-i", yourRealPath, "-filter_complex",
"[0:v]setpts=2.0*PTS[v];[0:a]atempo=0.7[a]", "-map", "[v]", "-map",
"[a]", "-b:v", "2097k", "-r", "60", "-vcodec", "mpeg4", filePath}
Thanks.
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Re: [FFmpeg-user] 回复： [help]does ffmpeg support AJA kona as input devices
On 3/1/2021 10:37 PM, 梦开始的地方 wrote: I use it on linux，how to compile ffmpeg with video4linux support kona Look at the ffmpeg wiki for build and usage instructions (https://trac.ffmpeg.org/); also at the main ffmpeg documentation page (https://ffmpeg.org/documentation.html). Please do not top-post on this mailing list (the reply goes below the quoted parts). Later, z! ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] ?????? [help]does ffmpeg support AJA kona as input devices
I use it on linux，how to compile ffmpeg with video4linux support kona --原始邮件-- 发件人: "FFmpeg user questions" https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] [help]does ffmpeg support AJA kona as input devices
On 3/1/2021 10:25 PM, 梦开始的地方 wrote: hello,I'd like to knowdoes ffmpeg support AJA kona as input devices？ AFAIK, Aja devices are not supported directly. If you're using windoze, you can have the Kona export a DirectShow device that ffmpeg can then capture. On linux, the Kona has video4linux support (which can go into ffmpeg). More detail about what you have and want to do is always useful. z! ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] [help]does ffmpeg support AJA kona as input devices
hello,I'd like to knowdoes ffmpeg support AJA kona as input devices？ ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Linux 64 bit ffmpeg compilation
On Tue, 2 Mar 2021 at 09:13, Carl Zwanzig wrote: > On 3/1/2021 6:41 PM, KRISHNAKUMAR N K wrote: > > would like to know FFmpeg is 64bit by default > > "default" depends on the build platform and parameters. If you are > building > on a 64-bit platform, configure should select this (read the configure > output or check config.h for "#define ARCH_X86_64 1"). > > "./configure -h" will tell you all of the supported flags. > > Okay, I can see the following from the configure output *"ARCH x86 (generic)",a*lso i can see "*#define ARCH_X86_64 1*" in config.h file. Thanks Krishnakumar > > z! > ___ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Linux 64 bit ffmpeg compilation
On 3/1/2021 6:41 PM, KRISHNAKUMAR N K wrote: would like to know FFmpeg is 64bit by default "default" depends on the build platform and parameters. If you are building on a 64-bit platform, configure should select this (read the configure output or check config.h for "#define ARCH_X86_64 1"). "./configure -h" will tell you all of the supported flags. z! ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] Linux 64 bit ffmpeg compilation
Hi
I have followed ffmpeg compilation guide "
https://trac.ffmpeg.org/wiki/CompilationGuide/Centos; and its successful,
would like to know FFmpeg is 64bit by default (or) should i need to enable
any flags / properties. Also is there any ffmpeg tuning
guide/recommendation?
ffmpeg version 4.3 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 8 (GCC)
configuration: --prefix=/root/ffmpeg-4.3/ffmpeg_build
--pkg-config-flags=--static
--extra-cflags=-I/root/ffmpeg-4.3/ffmpeg_build/include
--extra-ldflags=-L/root/ffmpeg-4.3/ffmpeg_build/lib --extra-libs=-lpthread
--extra-libs=-lm --bindir=/root/ffmpeg-4.3/bin --enable-gpl
--enable-libfdk_aac --enable-libfreetype --enable-libmp3lame
--enable-libopus --enable-libvpx --enable-libx264 --enable-libx265
--enable-nonfree --enable-openssl
libavutil 56. 51.100 / 56. 51.100
libavcodec 58. 91.100 / 58. 91.100
libavformat58. 45.100 / 58. 45.100
libavdevice58. 10.100 / 58. 10.100
libavfilter 7. 85.100 / 7. 85.100
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
libpostproc55. 7.100 / 55. 7.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options]
outfile}...
Regards
*KrishnaKumar **N K *
*Mobile:* +91 9894024256
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[FFmpeg-user] filter pipeline 'PTS' -- int64_t?
The ffmpeg filter pipeline assigns a 'PTS' to each frame, frame by frame. Is
*that* 'PTS' an int64_t?
Things I have found.
https://ffmpeg.org/ffmpeg-filters.html#fps-1
"...trim any frames with a negative PTS."
That implies that PTS can be negative (ergo, is a signed integer).
http://svn.ffmpeg.org/doxygen/1.0/structAVFrame.html
Is AVFrame the structure of frames in the filter pipeline? If so, then
"int64_t pts
" presentation timestamp in time_base units (time when frame should be shown to user) If
"AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed."
appears to answer my question, unless it's a different 'frame'...
...What exactly is 'AVFrame'?
http://svn.ffmpeg.org/doxygen/1.0/avformat_8h-source.html
"00320 typedef struct AVFrac {
"00321 int64_t val, num, den;
"00322 } AVFrac;"
http://svn.ffmpeg.org/doxygen/1.0/structAVFrac.html#_details
"The exact value of the fractional number is: 'val + num / den'."
That appears to be a definition of something called "PTS" but seems to not be what's assigned to a
frame in the filter pipeline.
The label (name) of what is actually assigned to frames in the filter pipeline as 'PTS' is unknown
to me.
Thanks for the guidance,
Mark.
--
In U.S. History: The House Un-American Activities Committee was a committee of the House of
Representatives that engaged in un-American activities.
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Re: [FFmpeg-user] SSIM filter showing (small) differences in identical(?) streams
On 2/28/21 12:57 PM, Paul B Mahol wrote: On Sun, Feb 28, 2021 at 5:31 PM Ian Pilcher wrote: $ ffmpeg -i lossless.mkv -start_number 0 -i source/%06d.tif -frames:v 3596 -lavfi "[0:v]settb=1/AVTB,setpts=PTS-STARTPTS[main];[1:v]settb=1/AVTB,setpts=PTS-STARTPTS[ref];[main][ref]ssim" -f null - Try ssim=shortest=1 Most likely inputs have not same number of frames. They don't have the same number of frames. That's why I need to specify the duration, either with "-t 00:01:00" or with "-frames:v 3596". The correct number of frames *is* 3596, however, so I don't understand why I have to limit the comparison to only 3595 frames to get the correct result. -- In Soviet Russia, Google searches you! ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Issue when adding a title to an audio stream within a mp4 file
Thank you Moritz. I really apreciate your kind answer. But ... I don't understand what you are planning to do. Please tell me if I'm right or wrong : - ffprobe/ffmpeg will display the data contained in the "name" atom to stdout/stderr BUT - ffmpeg will NOT be able to copy the audio stream "title" to a new MP4 output file by using the -c copy option Please let me know. Pascal ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
