[FFmpeg-devel,v2,2/2] avformat/hlsenc: avformat/hlsenc: reopen new http session for http_persistent

Submitted by Steven Liu on Aug. 29, 2019, 11:14 p.m.

Details

Message ID 20190829231428.27877-2-lq@chinaffmpeg.org
State New
Headers show

Commit Message

Steven Liu Aug. 29, 2019, 11:14 p.m.
fix ticket: 7975

Signed-off-by: Steven Liu <lq@chinaffmpeg.org>
---
 libavformat/hlsenc.c | 66 +++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 55 insertions(+), 11 deletions(-)

Comments

Ian Klassen Sept. 3, 2019, 2:30 p.m.
On Thu, Aug 29, 2019 at 6:15 PM Steven Liu <lq@chinaffmpeg.org> wrote:

> fix ticket: 7975
>
> Signed-off-by: Steven Liu <lq@chinaffmpeg.org>
> ---
>  libavformat/hlsenc.c | 66
> +++++++++++++++++++++++++++++++++++++++++++---------
>  1 file changed, 55 insertions(+), 11 deletions(-)
>
> diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
> index c6bd664b92..d9b48f0e7c 100644
> --- a/libavformat/hlsenc.c
> +++ b/libavformat/hlsenc.c
> @@ -118,6 +118,7 @@ typedef struct VariantStream {
>      AVIOContext *out;
>      int packets_written;
>      int init_range_length;
> +    uint8_t *temp_buffer;
>
>      AVFormatContext *avf;
>      AVFormatContext *vtt_avf;
> @@ -262,11 +263,12 @@ static int hlsenc_io_open(AVFormatContext *s,
> AVIOContext **pb, char *filename,
>      return err;
>  }
>
> -static void hlsenc_io_close(AVFormatContext *s, AVIOContext **pb, char
> *filename) {
> +static int hlsenc_io_close(AVFormatContext *s, AVIOContext **pb, char
> *filename) {
>      HLSContext *hls = s->priv_data;
>      int http_base_proto = filename ? ff_is_http_proto(filename) : 0;
> +    int ret = 0;
>      if (!*pb)
> -        return;
> +        return ret;
>      if (!http_base_proto || !hls->http_persistent || hls->key_info_file
> || hls->encrypt) {
>          ff_format_io_close(s, pb);
>  #if CONFIG_HTTP_PROTOCOL
> @@ -275,8 +277,10 @@ static void hlsenc_io_close(AVFormatContext *s,
> AVIOContext **pb, char *filename
>          av_assert0(http_url_context);
>          avio_flush(*pb);
>          ffurl_shutdown(http_url_context, AVIO_FLAG_WRITE);
> +        ret = ff_http_get_shutdown_status(http_url_context);
>  #endif
>      }
> +    return ret;
>  }
>
>  static void set_http_options(AVFormatContext *s, AVDictionary **options,
> HLSContext *c)
> @@ -447,7 +451,6 @@ static void write_styp(AVIOContext *pb)
>  static int flush_dynbuf(VariantStream *vs, int *range_length)
>  {
>      AVFormatContext *ctx = vs->avf;
> -    uint8_t *buffer;
>
>      if (!ctx->pb) {
>          return AVERROR(EINVAL);
> @@ -458,15 +461,20 @@ static int flush_dynbuf(VariantStream *vs, int
> *range_length)
>      avio_flush(ctx->pb);
>
>      // write out to file
> -    *range_length = avio_close_dyn_buf(ctx->pb, &buffer);
> +    *range_length = avio_close_dyn_buf(ctx->pb, &vs->temp_buffer);
>      ctx->pb = NULL;
> -    avio_write(vs->out, buffer, *range_length);
> -    av_free(buffer);
> +    avio_write(vs->out, vs->temp_buffer, *range_length);
>
>      // re-open buffer
>      return avio_open_dyn_buf(&ctx->pb);
>  }
>
> +static void reflush_dynbuf(VariantStream *vs, int *range_length)
> +{
> +    // re-open buffer
> +    avio_write(vs->out, vs->temp_buffer, *range_length);;
> +}
> +
>  static int hls_delete_old_segments(AVFormatContext *s, HLSContext *hls,
>                                     VariantStream *vs) {
>
> @@ -1544,7 +1552,10 @@ static int hls_window(AVFormatContext *s, int last,
> VariantStream *vs)
>
>  fail:
>      av_dict_free(&options);
> -    hlsenc_io_close(s, (byterange_mode || hls->segment_type ==
> SEGMENT_TYPE_FMP4) ? &hls->m3u8_out : &vs->out, temp_filename);
> +    ret = hlsenc_io_close(s, (byterange_mode || hls->segment_type ==
> SEGMENT_TYPE_FMP4) ? &hls->m3u8_out : &vs->out, temp_filename);
> +    if (ret < 0) {
> +        return ret;
> +    }
>      hlsenc_io_close(s, &hls->sub_m3u8_out, vs->vtt_m3u8_name);
>      if (use_temp_file) {
>          ff_rename(temp_filename, vs->m3u8_name, s);
> @@ -2399,7 +2410,16 @@ static int hls_write_packet(AVFormatContext *s,
> AVPacket *pkt)
>                  if (ret < 0) {
>                      return ret;
>                  }
> -                hlsenc_io_close(s, &vs->out, filename);
> +                ret = hlsenc_io_close(s, &vs->out, filename);
> +                if (ret < 0) {
> +                    av_log(s, AV_LOG_WARNING, "upload segment failed,"
> +                           "and will retry upload by a new http
> session.\n");
> +                    ff_format_io_close(s, &vs->out);
> +                    ret = hlsenc_io_open(s, &vs->out, filename, &options);
> +                    reflush_dynbuf(vs, &range_length);
> +                    ret = hlsenc_io_close(s, &vs->out, filename);
> +                }
> +                av_free(vs->temp_buffer);
>                  av_free(filename);
>              }
>          }
> @@ -2426,8 +2446,13 @@ static int hls_write_packet(AVFormatContext *s,
> AVPacket *pkt)
>          // if we're building a VOD playlist, skip writing the manifest
> multiple times, and just wait until the end
>          if (hls->pl_type != PLAYLIST_TYPE_VOD) {
>              if ((ret = hls_window(s, 0, vs)) < 0) {
> -                av_free(old_filename);
> -                return ret;
> +                av_log(s, AV_LOG_WARNING, "update playlist failed, will
> retry once time\n");
> +                ff_format_io_close(s, &vs->out);
> +                vs->out = NULL;
> +                if ((ret = hls_window(s, 0, vs)) < 0) {
> +                    av_free(old_filename);
> +                    return ret;
> +                }
>              }
>          }
>
> @@ -2579,6 +2604,20 @@ static int hls_write_trailer(struct AVFormatContext
> *s)
>
>          vs->size = range_length;
>          hlsenc_io_close(s, &vs->out, filename);
> +        ret = hlsenc_io_close(s, &vs->out, filename);
> +        if (ret < 0) {
> +            av_log(s, AV_LOG_WARNING, "write segment failed, will close
> old handle and retry once time\n");
> +            ff_format_io_close(s, &vs->out);
> +            ret = hlsenc_io_open(s, &vs->out, filename, &options);
> +            if (ret < 0) {
> +                av_log(s, AV_LOG_ERROR, "Failed to open file '%s'\n",
> vs->avf->url);
> +                goto failed;
> +            }
> +            reflush_dynbuf(vs, &range_length);
> +            ret = hlsenc_io_close(s, &vs->out, filename);
> +        }
> +        av_free(vs->temp_buffer);
> +
>  failed:
>          av_free(filename);
>          av_write_trailer(oc);
> @@ -2610,7 +2649,12 @@ failed:
>              ff_format_io_close(s, &vtt_oc->pb);
>              avformat_free_context(vtt_oc);
>          }
> -        hls_window(s, 1, vs);
> +        ret = hls_window(s, 1, vs);
> +        if (ret < 0) {
> +            av_log(s, AV_LOG_WARNING, "update playlist failed, will retry
> once time\n");
> +            ff_format_io_close(s, &vs->out);
> +            hls_window(s, 1, vs);
> +        }
>          avformat_free_context(oc);
>
>          vs->avf = NULL;
> --
> 2.15.1
>
>
>
> _______________________________________________
> 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".


Hi,

I have confirmed that these patches fix the bug. Thank you!

Just a couple of comments:

1) Currently two different error messages are shown for the same condition:

"upload segment failed,and will retry upload by a new http session" and
"update playlist failed, will retry once time"

I would suggest having one message, perhaps "upload failed, will retry with
a new http session".

2) Is AV_LOG_WARNING the correct log level for this type of message? It
clutters the output very quickly for what could be a normal condition (for
servers that don't support persistent connections or have limited the
number of consecutive requests on a connection).

Thanks again!

Ian
Steven Liu Sept. 3, 2019, 2:50 p.m.
> 在 2019年9月3日,22:30,Ian Klassen <ian@virtualfunc.com> 写道:
> 
> On Thu, Aug 29, 2019 at 6:15 PM Steven Liu <lq@chinaffmpeg.org> wrote:
> 
>> fix ticket: 7975
>> 
>> Signed-off-by: Steven Liu <lq@chinaffmpeg.org>
>> ---
>> libavformat/hlsenc.c | 66
>> +++++++++++++++++++++++++++++++++++++++++++---------
>> 1 file changed, 55 insertions(+), 11 deletions(-)
>> 
>> diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
>> index c6bd664b92..d9b48f0e7c 100644
>> --- a/libavformat/hlsenc.c
>> +++ b/libavformat/hlsenc.c
>> @@ -118,6 +118,7 @@ typedef struct VariantStream {
>>     AVIOContext *out;
>>     int packets_written;
>>     int init_range_length;
>> +    uint8_t *temp_buffer;
>> 
>>     AVFormatContext *avf;
>>     AVFormatContext *vtt_avf;
>> @@ -262,11 +263,12 @@ static int hlsenc_io_open(AVFormatContext *s,
>> AVIOContext **pb, char *filename,
>>     return err;
>> }
>> 
>> -static void hlsenc_io_close(AVFormatContext *s, AVIOContext **pb, char
>> *filename) {
>> +static int hlsenc_io_close(AVFormatContext *s, AVIOContext **pb, char
>> *filename) {
>>     HLSContext *hls = s->priv_data;
>>     int http_base_proto = filename ? ff_is_http_proto(filename) : 0;
>> +    int ret = 0;
>>     if (!*pb)
>> -        return;
>> +        return ret;
>>     if (!http_base_proto || !hls->http_persistent || hls->key_info_file
>> || hls->encrypt) {
>>         ff_format_io_close(s, pb);
>> #if CONFIG_HTTP_PROTOCOL
>> @@ -275,8 +277,10 @@ static void hlsenc_io_close(AVFormatContext *s,
>> AVIOContext **pb, char *filename
>>         av_assert0(http_url_context);
>>         avio_flush(*pb);
>>         ffurl_shutdown(http_url_context, AVIO_FLAG_WRITE);
>> +        ret = ff_http_get_shutdown_status(http_url_context);
>> #endif
>>     }
>> +    return ret;
>> }
>> 
>> static void set_http_options(AVFormatContext *s, AVDictionary **options,
>> HLSContext *c)
>> @@ -447,7 +451,6 @@ static void write_styp(AVIOContext *pb)
>> static int flush_dynbuf(VariantStream *vs, int *range_length)
>> {
>>     AVFormatContext *ctx = vs->avf;
>> -    uint8_t *buffer;
>> 
>>     if (!ctx->pb) {
>>         return AVERROR(EINVAL);
>> @@ -458,15 +461,20 @@ static int flush_dynbuf(VariantStream *vs, int
>> *range_length)
>>     avio_flush(ctx->pb);
>> 
>>     // write out to file
>> -    *range_length = avio_close_dyn_buf(ctx->pb, &buffer);
>> +    *range_length = avio_close_dyn_buf(ctx->pb, &vs->temp_buffer);
>>     ctx->pb = NULL;
>> -    avio_write(vs->out, buffer, *range_length);
>> -    av_free(buffer);
>> +    avio_write(vs->out, vs->temp_buffer, *range_length);
>> 
>>     // re-open buffer
>>     return avio_open_dyn_buf(&ctx->pb);
>> }
>> 
>> +static void reflush_dynbuf(VariantStream *vs, int *range_length)
>> +{
>> +    // re-open buffer
>> +    avio_write(vs->out, vs->temp_buffer, *range_length);;
>> +}
>> +
>> static int hls_delete_old_segments(AVFormatContext *s, HLSContext *hls,
>>                                    VariantStream *vs) {
>> 
>> @@ -1544,7 +1552,10 @@ static int hls_window(AVFormatContext *s, int last,
>> VariantStream *vs)
>> 
>> fail:
>>     av_dict_free(&options);
>> -    hlsenc_io_close(s, (byterange_mode || hls->segment_type ==
>> SEGMENT_TYPE_FMP4) ? &hls->m3u8_out : &vs->out, temp_filename);
>> +    ret = hlsenc_io_close(s, (byterange_mode || hls->segment_type ==
>> SEGMENT_TYPE_FMP4) ? &hls->m3u8_out : &vs->out, temp_filename);
>> +    if (ret < 0) {
>> +        return ret;
>> +    }
>>     hlsenc_io_close(s, &hls->sub_m3u8_out, vs->vtt_m3u8_name);
>>     if (use_temp_file) {
>>         ff_rename(temp_filename, vs->m3u8_name, s);
>> @@ -2399,7 +2410,16 @@ static int hls_write_packet(AVFormatContext *s,
>> AVPacket *pkt)
>>                 if (ret < 0) {
>>                     return ret;
>>                 }
>> -                hlsenc_io_close(s, &vs->out, filename);
>> +                ret = hlsenc_io_close(s, &vs->out, filename);
>> +                if (ret < 0) {
>> +                    av_log(s, AV_LOG_WARNING, "upload segment failed,"
>> +                           "and will retry upload by a new http
>> session.\n");
>> +                    ff_format_io_close(s, &vs->out);
>> +                    ret = hlsenc_io_open(s, &vs->out, filename, &options);
>> +                    reflush_dynbuf(vs, &range_length);
>> +                    ret = hlsenc_io_close(s, &vs->out, filename);
>> +                }
>> +                av_free(vs->temp_buffer);
>>                 av_free(filename);
>>             }
>>         }
>> @@ -2426,8 +2446,13 @@ static int hls_write_packet(AVFormatContext *s,
>> AVPacket *pkt)
>>         // if we're building a VOD playlist, skip writing the manifest
>> multiple times, and just wait until the end
>>         if (hls->pl_type != PLAYLIST_TYPE_VOD) {
>>             if ((ret = hls_window(s, 0, vs)) < 0) {
>> -                av_free(old_filename);
>> -                return ret;
>> +                av_log(s, AV_LOG_WARNING, "update playlist failed, will
>> retry once time\n");
>> +                ff_format_io_close(s, &vs->out);
>> +                vs->out = NULL;
>> +                if ((ret = hls_window(s, 0, vs)) < 0) {
>> +                    av_free(old_filename);
>> +                    return ret;
>> +                }
>>             }
>>         }
>> 
>> @@ -2579,6 +2604,20 @@ static int hls_write_trailer(struct AVFormatContext
>> *s)
>> 
>>         vs->size = range_length;
>>         hlsenc_io_close(s, &vs->out, filename);
>> +        ret = hlsenc_io_close(s, &vs->out, filename);
>> +        if (ret < 0) {
>> +            av_log(s, AV_LOG_WARNING, "write segment failed, will close
>> old handle and retry once time\n");
>> +            ff_format_io_close(s, &vs->out);
>> +            ret = hlsenc_io_open(s, &vs->out, filename, &options);
>> +            if (ret < 0) {
>> +                av_log(s, AV_LOG_ERROR, "Failed to open file '%s'\n",
>> vs->avf->url);
>> +                goto failed;
>> +            }
>> +            reflush_dynbuf(vs, &range_length);
>> +            ret = hlsenc_io_close(s, &vs->out, filename);
>> +        }
>> +        av_free(vs->temp_buffer);
>> +
>> failed:
>>         av_free(filename);
>>         av_write_trailer(oc);
>> @@ -2610,7 +2649,12 @@ failed:
>>             ff_format_io_close(s, &vtt_oc->pb);
>>             avformat_free_context(vtt_oc);
>>         }
>> -        hls_window(s, 1, vs);
>> +        ret = hls_window(s, 1, vs);
>> +        if (ret < 0) {
>> +            av_log(s, AV_LOG_WARNING, "update playlist failed, will retry
>> once time\n");
>> +            ff_format_io_close(s, &vs->out);
>> +            hls_window(s, 1, vs);
>> +        }
>>         avformat_free_context(oc);
>> 
>>         vs->avf = NULL;
>> --
>> 2.15.1
>> 
>> 
>> 
>> _______________________________________________
>> 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".
> 
> 
> Hi,
> 
> I have confirmed that these patches fix the bug. Thank you!
> 
> Just a couple of comments:
> 
> 1) Currently two different error messages are shown for the same condition:
> 
> "upload segment failed,and will retry upload by a new http session" and
> "update playlist failed, will retry once time"
> 
> I would suggest having one message, perhaps "upload failed, will retry with
> a new http session".
> 
> 2) Is AV_LOG_WARNING the correct log level for this type of message? It
> clutters the output very quickly for what could be a normal condition (for
> servers that don't support persistent connections or have limited the
> number of consecutive requests on a connection).

Hi Ian,

	Thanks for your test and the comments, will push with the comments by you suggestions.
> 
> Thanks again!
> 
> Ian
> _______________________________________________
> 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".

Thanks
Steven

Patch hide | download patch | download mbox

diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
index c6bd664b92..d9b48f0e7c 100644
--- a/libavformat/hlsenc.c
+++ b/libavformat/hlsenc.c
@@ -118,6 +118,7 @@  typedef struct VariantStream {
     AVIOContext *out;
     int packets_written;
     int init_range_length;
+    uint8_t *temp_buffer;
 
     AVFormatContext *avf;
     AVFormatContext *vtt_avf;
@@ -262,11 +263,12 @@  static int hlsenc_io_open(AVFormatContext *s, AVIOContext **pb, char *filename,
     return err;
 }
 
-static void hlsenc_io_close(AVFormatContext *s, AVIOContext **pb, char *filename) {
+static int hlsenc_io_close(AVFormatContext *s, AVIOContext **pb, char *filename) {
     HLSContext *hls = s->priv_data;
     int http_base_proto = filename ? ff_is_http_proto(filename) : 0;
+    int ret = 0;
     if (!*pb)
-        return;
+        return ret;
     if (!http_base_proto || !hls->http_persistent || hls->key_info_file || hls->encrypt) {
         ff_format_io_close(s, pb);
 #if CONFIG_HTTP_PROTOCOL
@@ -275,8 +277,10 @@  static void hlsenc_io_close(AVFormatContext *s, AVIOContext **pb, char *filename
         av_assert0(http_url_context);
         avio_flush(*pb);
         ffurl_shutdown(http_url_context, AVIO_FLAG_WRITE);
+        ret = ff_http_get_shutdown_status(http_url_context);
 #endif
     }
+    return ret;
 }
 
 static void set_http_options(AVFormatContext *s, AVDictionary **options, HLSContext *c)
@@ -447,7 +451,6 @@  static void write_styp(AVIOContext *pb)
 static int flush_dynbuf(VariantStream *vs, int *range_length)
 {
     AVFormatContext *ctx = vs->avf;
-    uint8_t *buffer;
 
     if (!ctx->pb) {
         return AVERROR(EINVAL);
@@ -458,15 +461,20 @@  static int flush_dynbuf(VariantStream *vs, int *range_length)
     avio_flush(ctx->pb);
 
     // write out to file
-    *range_length = avio_close_dyn_buf(ctx->pb, &buffer);
+    *range_length = avio_close_dyn_buf(ctx->pb, &vs->temp_buffer);
     ctx->pb = NULL;
-    avio_write(vs->out, buffer, *range_length);
-    av_free(buffer);
+    avio_write(vs->out, vs->temp_buffer, *range_length);
 
     // re-open buffer
     return avio_open_dyn_buf(&ctx->pb);
 }
 
+static void reflush_dynbuf(VariantStream *vs, int *range_length)
+{
+    // re-open buffer
+    avio_write(vs->out, vs->temp_buffer, *range_length);;
+}
+
 static int hls_delete_old_segments(AVFormatContext *s, HLSContext *hls,
                                    VariantStream *vs) {
 
@@ -1544,7 +1552,10 @@  static int hls_window(AVFormatContext *s, int last, VariantStream *vs)
 
 fail:
     av_dict_free(&options);
-    hlsenc_io_close(s, (byterange_mode || hls->segment_type == SEGMENT_TYPE_FMP4) ? &hls->m3u8_out : &vs->out, temp_filename);
+    ret = hlsenc_io_close(s, (byterange_mode || hls->segment_type == SEGMENT_TYPE_FMP4) ? &hls->m3u8_out : &vs->out, temp_filename);
+    if (ret < 0) {
+        return ret;
+    }
     hlsenc_io_close(s, &hls->sub_m3u8_out, vs->vtt_m3u8_name);
     if (use_temp_file) {
         ff_rename(temp_filename, vs->m3u8_name, s);
@@ -2399,7 +2410,16 @@  static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
                 if (ret < 0) {
                     return ret;
                 }
-                hlsenc_io_close(s, &vs->out, filename);
+                ret = hlsenc_io_close(s, &vs->out, filename);
+                if (ret < 0) {
+                    av_log(s, AV_LOG_WARNING, "upload segment failed,"
+                           "and will retry upload by a new http session.\n");
+                    ff_format_io_close(s, &vs->out);
+                    ret = hlsenc_io_open(s, &vs->out, filename, &options);
+                    reflush_dynbuf(vs, &range_length);
+                    ret = hlsenc_io_close(s, &vs->out, filename);
+                }
+                av_free(vs->temp_buffer);
                 av_free(filename);
             }
         }
@@ -2426,8 +2446,13 @@  static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
         // if we're building a VOD playlist, skip writing the manifest multiple times, and just wait until the end
         if (hls->pl_type != PLAYLIST_TYPE_VOD) {
             if ((ret = hls_window(s, 0, vs)) < 0) {
-                av_free(old_filename);
-                return ret;
+                av_log(s, AV_LOG_WARNING, "update playlist failed, will retry once time\n");
+                ff_format_io_close(s, &vs->out);
+                vs->out = NULL;
+                if ((ret = hls_window(s, 0, vs)) < 0) {
+                    av_free(old_filename);
+                    return ret;
+                }
             }
         }
 
@@ -2579,6 +2604,20 @@  static int hls_write_trailer(struct AVFormatContext *s)
 
         vs->size = range_length;
         hlsenc_io_close(s, &vs->out, filename);
+        ret = hlsenc_io_close(s, &vs->out, filename);
+        if (ret < 0) {
+            av_log(s, AV_LOG_WARNING, "write segment failed, will close old handle and retry once time\n");
+            ff_format_io_close(s, &vs->out);
+            ret = hlsenc_io_open(s, &vs->out, filename, &options);
+            if (ret < 0) {
+                av_log(s, AV_LOG_ERROR, "Failed to open file '%s'\n", vs->avf->url);
+                goto failed;
+            }
+            reflush_dynbuf(vs, &range_length);
+            ret = hlsenc_io_close(s, &vs->out, filename);
+        }
+        av_free(vs->temp_buffer);
+
 failed:
         av_free(filename);
         av_write_trailer(oc);
@@ -2610,7 +2649,12 @@  failed:
             ff_format_io_close(s, &vtt_oc->pb);
             avformat_free_context(vtt_oc);
         }
-        hls_window(s, 1, vs);
+        ret = hls_window(s, 1, vs);
+        if (ret < 0) {
+            av_log(s, AV_LOG_WARNING, "update playlist failed, will retry once time\n");
+            ff_format_io_close(s, &vs->out);
+            hls_window(s, 1, vs);
+        }
         avformat_free_context(oc);
 
         vs->avf = NULL;