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From: 1+1=10 via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>
To: "Zhao Zhili" <quinkblack@foxmail.com>,
	"FFmpeg development discussions and patches"
	<ffmpeg-devel@ffmpeg.org>
Cc: 1+1=10 <1441923451@qq.com>
Subject: Re: [FFmpeg-devel] [PATCH 1/1] add option in file.c: pkt_size to setmax_packet_size
Date: Thu, 31 Jul 2025 13:16:56 +0800
Message-ID: <tencent_C5E07AD225D6293D02471616B01F67320407@qq.com> (raw)
In-Reply-To: <tencent_DC6ABA017569DE7F3AAC463971C04DB4180A@qq.com>

1+1=10
1441923451@qq.com



        This modification references the max_packet_size assignment method in other protocols, such as the one in udp.c；
This operation not only maintains the original setting but also adds custom settings；
For example, when reading a local file, you can first set pkt_size using av_dict_set and then pass the option in avio_open2；
This is mainly to deal with the situation where the IoT device has small memory, so that max_packet_size can be customized；






&gt;&nbsp;On&nbsp;Jul&nbsp;17,&nbsp;2025,&nbsp;at&nbsp;22:05,&nbsp;yangsen5&nbsp;via&nbsp;ffmpeg-devel&nbsp;<ffmpeg-devel@ffmpeg.org&gt;&nbsp;wrote:
&gt;&nbsp;
&gt;&nbsp;From:&nbsp;yangsen5&nbsp;<1441923451@qq.com&gt;
&gt;&nbsp;
&gt;&nbsp;Signed-off-by:&nbsp;yangsen5&nbsp;<1441923451@qq.com&gt;
&gt;&nbsp;---
&gt;&nbsp;libavformat/file.c&nbsp;|&nbsp;4&nbsp;+++-
&gt;&nbsp;1&nbsp;file&nbsp;changed,&nbsp;3&nbsp;insertions(+),&nbsp;1&nbsp;deletion(-)
&gt;&nbsp;
&gt;&nbsp;diff&nbsp;--git&nbsp;a/libavformat/file.c&nbsp;b/libavformat/file.c
&gt;&nbsp;index&nbsp;6a66040b65..8099a7e931&nbsp;100644
&gt;&nbsp;---&nbsp;a/libavformat/file.c
&gt;&nbsp;+++&nbsp;b/libavformat/file.c
&gt;&nbsp;@@&nbsp;-94,6&nbsp;+94,7&nbsp;@@&nbsp;typedef&nbsp;struct&nbsp;FileContext&nbsp;{
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;fd;
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;trunc;
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;blocksize;
&gt;&nbsp;+&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;pkt_size;
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;follow;
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;seekable;
&gt;&nbsp;#if&nbsp;HAVE_DIRENT_H
&gt;&nbsp;@@&nbsp;-106,6&nbsp;+107,7&nbsp;@@&nbsp;static&nbsp;const&nbsp;AVOption&nbsp;file_options[]&nbsp;=&nbsp;{
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;"blocksize",&nbsp;"set&nbsp;I/O&nbsp;operation&nbsp;maximum&nbsp;block&nbsp;size",&nbsp;offsetof(FileContext,&nbsp;blocksize),&nbsp;AV_OPT_TYPE_INT,&nbsp;{&nbsp;.i64&nbsp;=&nbsp;INT_MAX&nbsp;},&nbsp;1,&nbsp;INT_MAX,&nbsp;AV_OPT_FLAG_ENCODING_PARAM&nbsp;},
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;"follow",&nbsp;"Follow&nbsp;a&nbsp;file&nbsp;as&nbsp;it&nbsp;is&nbsp;being&nbsp;written",&nbsp;offsetof(FileContext,&nbsp;follow),&nbsp;AV_OPT_TYPE_INT,&nbsp;{&nbsp;.i64&nbsp;=&nbsp;0&nbsp;},&nbsp;0,&nbsp;1,&nbsp;AV_OPT_FLAG_DECODING_PARAM&nbsp;},
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;"seekable",&nbsp;"Sets&nbsp;if&nbsp;the&nbsp;file&nbsp;is&nbsp;seekable",&nbsp;offsetof(FileContext,&nbsp;seekable),&nbsp;AV_OPT_TYPE_INT,&nbsp;{&nbsp;.i64&nbsp;=&nbsp;-1&nbsp;},&nbsp;-1,&nbsp;0,&nbsp;AV_OPT_FLAG_DECODING_PARAM&nbsp;|&nbsp;AV_OPT_FLAG_ENCODING_PARAM&nbsp;},
&gt;&nbsp;+&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;"pkt_size",&nbsp;"Maximum&nbsp;file&nbsp;packet&nbsp;size",&nbsp;offsetof(FileContext,&nbsp;pkt_size),&nbsp;AV_OPT_TYPE_INT,&nbsp;{&nbsp;.i64&nbsp;=&nbsp;262144&nbsp;},&nbsp;-1,&nbsp;INT_MAX,&nbsp;AV_OPT_FLAG_DECODING_PARAM&nbsp;|&nbsp;AV_OPT_FLAG_ENCODING_PARAM&nbsp;},
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;NULL&nbsp;}
&gt;&nbsp;};
&gt;&nbsp;
&gt;&nbsp;@@&nbsp;-313,7&nbsp;+315,7&nbsp;@@&nbsp;static&nbsp;int&nbsp;file_open(URLContext&nbsp;*h,&nbsp;const&nbsp;char&nbsp;*filename,&nbsp;int&nbsp;flags)
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/*&nbsp;Buffer&nbsp;writes&nbsp;more&nbsp;than&nbsp;the&nbsp;default&nbsp;32k&nbsp;to&nbsp;improve&nbsp;throughput&nbsp;especially
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;with&nbsp;networked&nbsp;file&nbsp;systems&nbsp;*/
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(!h-&gt;is_streamed&nbsp;&amp;&amp;&nbsp;flags&nbsp;&amp;&nbsp;AVIO_FLAG_WRITE)
&gt;&nbsp;-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;h-&gt;min_packet_size&nbsp;=&nbsp;h-&gt;max_packet_size&nbsp;=&nbsp;262144;
&gt;&nbsp;+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;h-&gt;min_packet_size&nbsp;=&nbsp;h-&gt;max_packet_size&nbsp;=&nbsp;c-&gt;pkt_size;

What's&nbsp;the&nbsp;use&nbsp;case?

&gt;&nbsp;
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(c-&gt;seekable&nbsp;&gt;=&nbsp;0)
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;h-&gt;is_streamed&nbsp;=&nbsp;!c-&gt;seekable;
&gt;&nbsp;--&nbsp;
&gt;&nbsp;2.34.1
&gt;&nbsp;




         原始邮件
         
       
发件人：Zhao Zhili <quinkblack@foxmail.com&gt;
发件时间：2025年7月17日 23:01
收件人：FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org&gt;
抄送：1441923451 <1441923451@qq.com&gt;
主题：Re: [FFmpeg-devel] [PATCH 1/1] add option in file.c: pkt_size to setmax_packet_size





&gt;&nbsp;On&nbsp;Jul&nbsp;17,&nbsp;2025,&nbsp;at&nbsp;22:05,&nbsp;yangsen5&nbsp;via&nbsp;ffmpeg-devel&nbsp;<ffmpeg-devel@ffmpeg.org&gt;&nbsp;wrote:
&gt;&nbsp;
&gt;&nbsp;From:&nbsp;yangsen5&nbsp;<1441923451@qq.com&gt;
&gt;&nbsp;
&gt;&nbsp;Signed-off-by:&nbsp;yangsen5&nbsp;<1441923451@qq.com&gt;
&gt;&nbsp;---
&gt;&nbsp;libavformat/file.c&nbsp;|&nbsp;4&nbsp;+++-
&gt;&nbsp;1&nbsp;file&nbsp;changed,&nbsp;3&nbsp;insertions(+),&nbsp;1&nbsp;deletion(-)
&gt;&nbsp;
&gt;&nbsp;diff&nbsp;--git&nbsp;a/libavformat/file.c&nbsp;b/libavformat/file.c
&gt;&nbsp;index&nbsp;6a66040b65..8099a7e931&nbsp;100644
&gt;&nbsp;---&nbsp;a/libavformat/file.c
&gt;&nbsp;+++&nbsp;b/libavformat/file.c
&gt;&nbsp;@@&nbsp;-94,6&nbsp;+94,7&nbsp;@@&nbsp;typedef&nbsp;struct&nbsp;FileContext&nbsp;{
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;fd;
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;trunc;
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;blocksize;
&gt;&nbsp;+&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;pkt_size;
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;follow;
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;seekable;
&gt;&nbsp;#if&nbsp;HAVE_DIRENT_H
&gt;&nbsp;@@&nbsp;-106,6&nbsp;+107,7&nbsp;@@&nbsp;static&nbsp;const&nbsp;AVOption&nbsp;file_options[]&nbsp;=&nbsp;{
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;"blocksize",&nbsp;"set&nbsp;I/O&nbsp;operation&nbsp;maximum&nbsp;block&nbsp;size",&nbsp;offsetof(FileContext,&nbsp;blocksize),&nbsp;AV_OPT_TYPE_INT,&nbsp;{&nbsp;.i64&nbsp;=&nbsp;INT_MAX&nbsp;},&nbsp;1,&nbsp;INT_MAX,&nbsp;AV_OPT_FLAG_ENCODING_PARAM&nbsp;},
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;"follow",&nbsp;"Follow&nbsp;a&nbsp;file&nbsp;as&nbsp;it&nbsp;is&nbsp;being&nbsp;written",&nbsp;offsetof(FileContext,&nbsp;follow),&nbsp;AV_OPT_TYPE_INT,&nbsp;{&nbsp;.i64&nbsp;=&nbsp;0&nbsp;},&nbsp;0,&nbsp;1,&nbsp;AV_OPT_FLAG_DECODING_PARAM&nbsp;},
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;"seekable",&nbsp;"Sets&nbsp;if&nbsp;the&nbsp;file&nbsp;is&nbsp;seekable",&nbsp;offsetof(FileContext,&nbsp;seekable),&nbsp;AV_OPT_TYPE_INT,&nbsp;{&nbsp;.i64&nbsp;=&nbsp;-1&nbsp;},&nbsp;-1,&nbsp;0,&nbsp;AV_OPT_FLAG_DECODING_PARAM&nbsp;|&nbsp;AV_OPT_FLAG_ENCODING_PARAM&nbsp;},
&gt;&nbsp;+&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;"pkt_size",&nbsp;"Maximum&nbsp;file&nbsp;packet&nbsp;size",&nbsp;offsetof(FileContext,&nbsp;pkt_size),&nbsp;AV_OPT_TYPE_INT,&nbsp;{&nbsp;.i64&nbsp;=&nbsp;262144&nbsp;},&nbsp;-1,&nbsp;INT_MAX,&nbsp;AV_OPT_FLAG_DECODING_PARAM&nbsp;|&nbsp;AV_OPT_FLAG_ENCODING_PARAM&nbsp;},
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;NULL&nbsp;}
&gt;&nbsp;};
&gt;&nbsp;
&gt;&nbsp;@@&nbsp;-313,7&nbsp;+315,7&nbsp;@@&nbsp;static&nbsp;int&nbsp;file_open(URLContext&nbsp;*h,&nbsp;const&nbsp;char&nbsp;*filename,&nbsp;int&nbsp;flags)
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/*&nbsp;Buffer&nbsp;writes&nbsp;more&nbsp;than&nbsp;the&nbsp;default&nbsp;32k&nbsp;to&nbsp;improve&nbsp;throughput&nbsp;especially
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*&nbsp;with&nbsp;networked&nbsp;file&nbsp;systems&nbsp;*/
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(!h-&gt;is_streamed&nbsp;&amp;&amp;&nbsp;flags&nbsp;&amp;&nbsp;AVIO_FLAG_WRITE)
&gt;&nbsp;-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;h-&gt;min_packet_size&nbsp;=&nbsp;h-&gt;max_packet_size&nbsp;=&nbsp;262144;
&gt;&nbsp;+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;h-&gt;min_packet_size&nbsp;=&nbsp;h-&gt;max_packet_size&nbsp;=&nbsp;c-&gt;pkt_size;

What's&nbsp;the&nbsp;use&nbsp;case?

&gt;&nbsp;
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(c-&gt;seekable&nbsp;&gt;=&nbsp;0)
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;h-&gt;is_streamed&nbsp;=&nbsp;!c-&gt;seekable;
&gt;&nbsp;--&nbsp;
&gt;&nbsp;2.34.1
&gt;&nbsp;
&gt;&nbsp;_______________________________________________
&gt;&nbsp;ffmpeg-devel&nbsp;mailing&nbsp;list
&gt;&nbsp;ffmpeg-devel@ffmpeg.org
&gt;&nbsp;https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
&gt;&nbsp;
&gt;&nbsp;To&nbsp;unsubscribe,&nbsp;visit&nbsp;link&nbsp;above,&nbsp;or&nbsp;email
&gt;&nbsp;ffmpeg-devel-request@ffmpeg.org&nbsp;with&nbsp;subject&nbsp;"unsubscribe".
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  reply	other threads:[~2025-07-31  5:17 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-07-17 14:05 [FFmpeg-devel] [PATCH 1/1] add option in file.c: pkt_size to set max_packet_size yangsen5 via ffmpeg-devel
2025-07-17 14:27 ` Gyan Doshi
     [not found]   ` <tencent_F5DB935EB016EAA13A72B320FCBC9331010A@qq.com>
2025-07-31  8:16     ` [FFmpeg-devel] [PATCH 1/1] add option in file.c: pkt_size toset max_packet_size Gyan Doshi
2025-07-17 15:01 ` [FFmpeg-devel] [PATCH 1/1] add option in file.c: pkt_size to set max_packet_size Zhao Zhili
2025-07-31  5:16   ` 1+1=10 via ffmpeg-devel [this message]
2025-07-31  5:47   ` [FFmpeg-devel] [PATCH 1/1] add option in file.c: pkt_size to setmax_packet_size 1+1=10 via ffmpeg-devel
2025-07-31  9:05 ` [FFmpeg-devel] [PATCH] add option in file.c: pkt_size to set max_packet_size yangsen5 via ffmpeg-devel

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