[FFmpeg-devel] [PATCH 1/1] avformat/avio: add configuration options for IO_BUFFER_SIZE

[FFmpeg-devel] [PATCH 1/1] avformat/avio: add configuration options for IO_BUFFER_SIZE

[joneyao6]

From: Jingwei Yao <joneyao6@gmail.com>

Signed-off-by: Jingwei Yao <joneyao6@gmail.com>
---
 configure             | 6 ++++++
 libavformat/aviobuf.c | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 04b83a8868..8ee33a4ba9 100755
--- a/configure
+++ b/configure
@@ -437,6 +437,7 @@ Advanced options (experts only):
                            disable buffer boundary checking in bitreaders
                            (faster, but may crash)
   --sws-max-filter-size=N  the max filter size swscale uses [$sws_max_filter_size_default]
+  --avio-buffer-size=N     the max buffer size aviobuf uses [$avio_buffer_size_default]
 
 Optimization options (experts only):
   --disable-asm            disable all assembly optimizations
@@ -2693,6 +2694,7 @@ CMDLINE_SET="
     arch
     as
     assert_level
+    avio_buffer_size
     build_suffix
     cc
     objcc
@@ -4181,6 +4183,9 @@ enable valgrind_backtrace
 sws_max_filter_size_default=256
 set_default sws_max_filter_size
 
+avio_buffer_size_default=32768
+set_default avio_buffer_size
+
 # internal components are enabled by default
 enable $EXTRALIBS_LIST
 
@@ -8259,6 +8264,7 @@ cat > $TMPH <<EOF
 #define BUILDSUF "$build_suffix"
 #define SLIBSUF "$SLIBSUF"
 #define SWS_MAX_FILTER_SIZE $sws_max_filter_size
+#define AVIO_BUFFER_SIZE $avio_buffer_size
 EOF
 
 test -n "$assert_level" &&
diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index 6a74c1ce68..7760c34ec9 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -33,7 +33,7 @@
 #include "internal.h"
 #include <stdarg.h>
 
-#define IO_BUFFER_SIZE 32768
+#define IO_BUFFER_SIZE AVIO_BUFFER_SIZE
 
 /**
  * Do seeks within this distance ahead of the current buffer by skipping
-- 
2.25.1

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Re: [FFmpeg-devel] [PATCH 1/1] avformat/avio: add configuration options for IO_BUFFER_SIZE

[Nicolas George]

joneyao6@gmail.com (HE12025-03-11):
> From: Jingwei Yao <joneyao6@gmail.com>
> 
> Signed-off-by: Jingwei Yao <joneyao6@gmail.com>
> ---
>  configure             | 6 ++++++
>  libavformat/aviobuf.c | 2 +-
>  2 files changed, 7 insertions(+), 1 deletion(-)

Thanks for the patch. It is missing the explanations about why.

Regards,

-- 
  Nicolas George
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Re: [FFmpeg-devel] [PATCH 1/1] avformat/avio: add configuration options for IO_BUFFER_SIZE

[姚靖威]

The purpose of this patch is to modify the default buffer size of the avio
module during compilation.
On some resource-constrained devices to save memory, the current default
value （32K), it can also be set to a smaller value.

Nicolas George <george@nsup.org> 于2025年3月11日周二 19:55写道：

> joneyao6@gmail.com (HE12025-03-11):
> > From: Jingwei Yao <joneyao6@gmail.com>
> >
> > Signed-off-by: Jingwei Yao <joneyao6@gmail.com>
> > ---
> >  configure             | 6 ++++++
> >  libavformat/aviobuf.c | 2 +-
> >  2 files changed, 7 insertions(+), 1 deletion(-)
>
> Thanks for the patch. It is missing the explanations about why.
>
> Regards,
>
> --
>   Nicolas George
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
>
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Re: [FFmpeg-devel] [PATCH 1/1] avformat/avio: add configuration options for IO_BUFFER_SIZE

[Zhao Zhili]

> On Mar 13, 2025, at 17:40, 姚靖威 <joneyao6@gmail.com> wrote:
> 
> The purpose of this patch is to modify the default buffer size of the avio
> module during compilation.
> On some resource-constrained devices to save memory, the current default
> value （32K), it can also be set to a smaller value.

Which protocol? And what’s the value used to replace the default 32KB?

> 
> Nicolas George <george@nsup.org> 于2025年3月11日周二 19:55写道：
> 
>> joneyao6@gmail.com (HE12025-03-11):
>>> From: Jingwei Yao <joneyao6@gmail.com>
>>> 
>>> Signed-off-by: Jingwei Yao <joneyao6@gmail.com>
>>> ---
>>> configure             | 6 ++++++
>>> libavformat/aviobuf.c | 2 +-
>>> 2 files changed, 7 insertions(+), 1 deletion(-)
>> 
>> Thanks for the patch. It is missing the explanations about why.
>> 
>> Regards,
>> 
>> --
>>  Nicolas George
>> _______________________________________________
>> ffmpeg-devel mailing list
>> ffmpeg-devel@ffmpeg.org
>> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>> 
>> To unsubscribe, visit link above, or email
>> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
>> 
> _______________________________________________
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> 
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".

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Re: [FFmpeg-devel] [PATCH 1/1] avformat/avio: add configuration options for IO_BUFFER_SIZE

[姚靖威]

[-- Attachment #1.1: Type: text/plain, Size: 2117 bytes --]

 protocols like local socket and local file.  In our product, I set
avio-buffer-size
value to 1024 in order to reduce memory.The OS we use is based on nuttx, it
can be used in very small resource chips.

[image: image.png]


Zhao Zhili <quinkblack-at-foxmail.com@ffmpeg.org> 于2025年3月13日周四 18:26写道：

>
>
> > On Mar 13, 2025, at 17:40, 姚靖威 <joneyao6@gmail.com> wrote:
> >
> > The purpose of this patch is to modify the default buffer size of the
> avio
> > module during compilation.
> > On some resource-constrained devices to save memory, the current default
> > value （32K), it can also be set to a smaller value.
>
> Which protocol? And what’s the value used to replace the default 32KB?
>
> >
> > Nicolas George <george@nsup.org> 于2025年3月11日周二 19:55写道：
> >
> >> joneyao6@gmail.com (HE12025-03-11):
> >>> From: Jingwei Yao <joneyao6@gmail.com>
> >>>
> >>> Signed-off-by: Jingwei Yao <joneyao6@gmail.com>
> >>> ---
> >>> configure             | 6 ++++++
> >>> libavformat/aviobuf.c | 2 +-
> >>> 2 files changed, 7 insertions(+), 1 deletion(-)
> >>
> >> Thanks for the patch. It is missing the explanations about why.
> >>
> >> Regards,
> >>
> >> --
> >>  Nicolas George
> >> _______________________________________________
> >> ffmpeg-devel mailing list
> >> ffmpeg-devel@ffmpeg.org
> >> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> >>
> >> To unsubscribe, visit link above, or email
> >> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
> >>
> > _______________________________________________
> > ffmpeg-devel mailing list
> > ffmpeg-devel@ffmpeg.org
> > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> >
> > To unsubscribe, visit link above, or email
> > ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
>
> _______________________________________________
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> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
>

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Re: [FFmpeg-devel] [PATCH 1/1] avformat/avio: add configuration options for IO_BUFFER_SIZE

[Zhao Zhili]

On Mar 13, 2025, at 19:30, 姚靖威 <joneyao6@gmail.com> wrote:
> 
> protocols like local socket and local file.  In our product, I set
> avio-buffer-size
> value to 1024 in order to reduce memory.The OS we use is based on nuttx, it
> can be used in very small resource chips.

How about runtime option like this?

https://ffmpeg.org/pipermail/ffmpeg-devel/2025-March/341107.html

Please don’t top-posting.

> 
> [image: image.png]
> 
> 
> Zhao Zhili <quinkblack-at-foxmail.com@ffmpeg.org> 于2025年3月13日周四 18:26写道：
> 
>> 
>> 
>>> On Mar 13, 2025, at 17:40, 姚靖威 <joneyao6@gmail.com> wrote:
>>> 
>>> The purpose of this patch is to modify the default buffer size of the
>> avio
>>> module during compilation.
>>> On some resource-constrained devices to save memory, the current default
>>> value （32K), it can also be set to a smaller value.
>> 
>> Which protocol? And what’s the value used to replace the default 32KB?
>> 
>>> 
>>> Nicolas George <george@nsup.org> 于2025年3月11日周二 19:55写道：
>>> 
>>>> joneyao6@gmail.com (HE12025-03-11):
>>>>> From: Jingwei Yao <joneyao6@gmail.com>
>>>>> 
>>>>> Signed-off-by: Jingwei Yao <joneyao6@gmail.com>
>>>>> ---
>>>>> configure             | 6 ++++++
>>>>> libavformat/aviobuf.c | 2 +-
>>>>> 2 files changed, 7 insertions(+), 1 deletion(-)
>>>> 
>>>> Thanks for the patch. It is missing the explanations about why.
>>>> 
>>>> Regards,
>>>> 
>>>> --
>>>> Nicolas George
>>>> _______________________________________________
>>>> ffmpeg-devel mailing list
>>>> ffmpeg-devel@ffmpeg.org
>>>> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>>>> 
>>>> To unsubscribe, visit link above, or email
>>>> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
>>>> 
>>> _______________________________________________
>>> ffmpeg-devel mailing list
>>> ffmpeg-devel@ffmpeg.org
>>> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>>> 
>>> To unsubscribe, visit link above, or email
>>> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
>> 
>> _______________________________________________
>> ffmpeg-devel mailing list
>> ffmpeg-devel@ffmpeg.org
>> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>> 
>> To unsubscribe, visit link above, or email
>> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
>> 
> 
> <image.png>_______________________________________________
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> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
> 

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Re: [FFmpeg-devel] [PATCH 1/1] avformat/avio: add configuration options for IO_BUFFER_SIZE

[Nicolas George]

姚靖威 (HE12025-03-13):
> The purpose of this patch is to modify the default buffer size of the avio
> module during compilation.

No, that is not the purpose, that is only what it does.

> On some resource-constrained devices to save memory, the current default
> value （32K), it can also be set to a smaller value.

THAT is the purpose. And it needs to go into the commit message.

> Nicolas George <george@nsup.org> 于2025年3月11日周二 19:55写道：

Top-posting is forbidden on this list; if you do not know what it means
look it up.

Regards,

-- 
  Nicolas George
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Re: [FFmpeg-devel] [PATCH 1/1] avformat/avio: add configuration options for IO_BUFFER_SIZE

[姚靖威]

Zhao Zhili <quinkblack-at-foxmail.com@ffmpeg.org> 于2025年3月13日周四 20:50写道：

> On Mar 13, 2025, at 19:30, 姚靖威 <joneyao6@gmail.com> wrote:
> >
> > protocols like local socket and local file.  In our product, I set
> > avio-buffer-size
> > value to 1024 in order to reduce memory.The OS we use is based on nuttx,
> it
> > can be used in very small resource chips.
>
> How about runtime option like this?
>
> https://ffmpeg.org/pipermail/ffmpeg-devel/2025-March/341107.html
>
> Please don’t top-posting.
>
>

https://ffmpeg.org/pipermail/ffmpeg-devel/2025-March/341107.html
it's a better way to implement and can resolve my problem.  Thank you for
your advice！
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