> On Aug 8, 2018, at 5:37 PM, Ronak <[email protected]> wrote:
>
>
>
>> On Aug 8, 2018, at 3:52 PM, Ronak <[email protected]> wrote:
>>
>>
>>
>>> On Aug 6, 2018, at 10:20 AM, Steven Liu <[email protected]> wrote:
>>>
>>>
>>>
>>>>> On Aug 6, 2018, at 19:29, Ronak Patel <[email protected]>
>>>>> wrote:
>>>>>
>>>>>
>>>>> On Aug 6, 2018, at 7:19 AM, Liu Steven <[email protected]> wrote:
>>>>>
>>>>>
>>>>>
>>>>>>> 在 2018年8月6日，下午7:12，Ronak Patel <[email protected]> 写道：
>>>>>>>
>>>>>>>
>>>>>>> On Aug 5, 2018, at 10:54 PM, Liu Steven <[email protected]> wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> 在 2018年8月4日，上午2:17，Ronak <[email protected]> 写道：
>>>>>>>>
>>>>>>>>>>>>>> I have read this patch some problem for this patch.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> 1. maybe there will have a problem when duration is not same
>>>>>>>>>>>>>> when every fragment, for example:
>>>>>>>>>>>>>> liuqideMacBook-Pro:xxx liuqi$ ./ffmpeg -v quiet -i
>>>>>>>>>>>>>> ~/Movies/Test/bbb_sunflower_1080p_30fps_normal.mp4 -c copy -f
>>>>>>>>>>>>>> hls -hls_list_size 0 output_test.m3u8
>>>>>>>>>>>>>> liuqideMacBook-Pro:xxx liuqi$ head -n 10 output_test.m3u8
>>>>>>>>>>>>>> #EXTM3U
>>>>>>>>>>>>>> #EXT-X-VERSION:3
>>>>>>>>>>>>>> #EXT-X-TARGETDURATION:8
>>>>>>>>>>>>>> #EXT-X-MEDIA-SEQUENCE:0
>>>>>>>>>>>>>> #EXTINF:3.866667,
>>>>>>>>>>>>>> output_test0.ts
>>>>>>>>>>>>>> #EXTINF:7.300000,
>>>>>>>>>>>>>> output_test1.ts
>>>>>>>>>>>>>> #EXTINF:8.333333,
>>>>>>>>>>>>>> output_test2.ts
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> the output_test0.ts’s duration is short than output_test1.ts,
>>>>>>>>>>>>>> the #EXT-X-TARGETDURATION need update to the longest duration.
>>>>>>>>>>>>>> this operation (check the longest duration) will happen at every
>>>>>>>>>>>>>> fragment write complete.
>>>>>>>>>>>>>> it will not update when move the update option to the
>>>>>>>>>>>>>> hls_write_header,
>>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> This is a problem in the code that splits the mpegts files. I've
>>>>>>>>>>>>> filed a separate issue for this here:
>>>>>>>>>>>>> https://trac.ffmpeg.org/ticket/7341. Mpegts segmentation should
>>>>>>>>>>>>> be following the hls_time parameter (or the default length).
>>>>>>>>>>>> This is whatever hls_time, is decide by keyframe position, this is
>>>>>>>>>>>> happen when GOP size is not a permanent t position.
>>>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>>>>> This is happening now with fMP4 assets, but not with mpegts.
>>>>>>>>>>>> Whatever fmp4 or mpegts, all of them need fix the problem of
>>>>>>>>>>>> duration refresh.
>>>>>>>>>>>>
>>>>>>>>>>>> for example:
>>>>>>>>>>>>
>>>>>>>>>>>> liuqideMacBook-Pro:xxx liuqi$ ./ffmpeg -ss -v quiet -i
>>>>>>>>>>>> ~/Movies/Test/bbb_sunflower_1080p_30fps_normal.mp4 -c copy -f hls
>>>>>>>>>>>> -hls_list_size 0 -hls_segment_type fmp4 -hls_time 3
>>>>>>>>>>>> output_test.m3u8
>>>>>>>>>>>> liuqideMacBook-Pro:xxx liuqi$ head -n 10 output_test.m3u8
>>>>>>>>>>>> #EXTM3U
>>>>>>>>>>>> #EXT-X-VERSION:7
>>>>>>>>>>>> #EXT-X-TARGETDURATION:8
>>>>>>>>>>>> #EXT-X-MEDIA-SEQUENCE:0
>>>>>>>>>>>> #EXT-X-MAP:URI="init.mp4"
>>>>>>>>>>>> #EXTINF:3.866667,
>>>>>>>>>>>> output_test0.m4s
>>>>>>>>>>>> #EXTINF:7.300000,
>>>>>>>>>>>> output_test1.m4s
>>>>>>>>>>>> #EXTINF:8.333333,
>>>>>>>>>>>> liuqideMacBook-Pro:xxx liuqi$
>>>>>>>>>>>
>>>>>>>>>>> This is after your patch:
>>>>>>>>>>> liuqideMacBook-Pro:xxx liuqi$ ./ffmpeg -ss 17 -v quiet -i
>>>>>>>>>>> ~/Movies/Test/bbb_sunflower_1080p_30fps_normal.mp4 -c copy -f hls
>>>>>>>>>>> -hls_list_size 0 -hls_segment_type fmp4 -hls_time 3 output_test.m3u8
>>>>>>>>>>> liuqideMacBook-Pro:xxx liuqi$ head -n 10 output_test.m3u8
>>>>>>>>>>> #EXTM3U
>>>>>>>>>>> #EXT-X-VERSION:7
>>>>>>>>>>> #EXT-X-TARGETDURATION:3
>>>>>>>>>>> #EXT-X-MEDIA-SEQUENCE:0
>>>>>>>>>>> #EXT-X-MAP:URI="init.mp4"
>>>>>>>>>>> #EXTINF:3.866667,
>>>>>>>>>>> output_test0.m4s
>>>>>>>>>>> #EXTINF:7.300000,
>>>>>>>>>>> output_test1.m4s
>>>>>>>>>>> #EXTINF:8.333333,
>>>>>>>>>>>
>>>>>>>>>>> The RFC https://www.rfc-editor.org/rfc/rfc8216.txt describe:
>>>>>>>>>>>
>>>>>>>>>>> 4.3.3.1. EXT-X-TARGETDURATION
>>>>>>>>>>>
>>>>>>>>>>> The EXT-X-TARGETDURATION tag specifies the maximum Media Segment
>>>>>>>>>>> duration. The EXTINF duration of each Media Segment in the Playlist
>>>>>>>>>>> file, when rounded to the nearest integer, MUST be less than or
>>>>>>>>>>> equal
>>>>>>>>>>> to the target duration; longer segments can trigger playback stalls
>>>>>>>>>>> or other errors. It applies to the entire Playlist file. Its
>>>>>>>>>>> format
>>>>>>>>>>> is:
>>>>>>>>>>>
>>>>>>>>>>> #EXT-X-TARGETDURATION:<s>
>>>>>>>>>>>
>>>>>>>>>>> where s is a decimal-integer indicating the target duration in
>>>>>>>>>>> seconds. The EXT-X-TARGETDURATION tag is REQUIRED.
>>>>>>>>>>>
>>>>>>>>>>> your patch make the EXT-X-TARGETDURATION less than EXTINF:7.300000
>>>>>>>>>>> EXTINF:8.333333
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>>>>> 2. the version maybe will update when use hls_segment_type or
>>>>>>>>>>>>>> append_list etc. when the operation is support from different
>>>>>>>>>>>>>> version m3u8.
>>>>>>>>>>>>>
>>>>>>>>>>>>> I don't follow what you mean here. The version number is known up
>>>>>>>>>>>>> front, based on the options that were passed in. It should be
>>>>>>>>>>>>> illegal to switch between versions when trying to update an
>>>>>>>>>>>>> existing manifest. When can this legitimately happen?
>>>>>>>>>>>> there maybe have some player cannot support high version of m3u8,
>>>>>>>>>>>> for example old parser or player just support the VERSION 3,
>>>>>>>>>>>> this must think about all of the player or parser, because ffmpeg
>>>>>>>>>>>> is not used only by myself.
>>>>>>>>>>>>
>>>>>>>>>>>> Or what about get the #EXT-X-VERSION position, to update it? looks
>>>>>>>>>>>> like flvenc.c or movenc.c date shift
>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>> 3. need update segments vs->segments when hls_list_size option
>>>>>>>>>>>>>> is set.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> What do you mean by this and where should I do it?
>>>>>>>>>>>> for example, hls_list_size is 4, the m3u8 list should refresh
>>>>>>>>>>>> every time when make a new fragment.
>>>>>>>>>>>>
>>>>>>>>>>>> first time:
>>>>>>>>>>>> 1.m4s
>>>>>>>>>>>> 2.m4s
>>>>>>>>>>>> 3.m4s
>>>>>>>>>>>> 4.m4s
>>>>>>>>>>>>
>>>>>>>>>>>> sencond time:
>>>>>>>>>>>> 2.m4s
>>>>>>>>>>>> 3.m4s
>>>>>>>>>>>> 4.m4s
>>>>>>>>>>>> 5.m4s
>>>>>>>>>>>
>>>>>>>>>>> after your patch:
>>>>>>>>>>>
>>>>>>>>>>> liuqideMacBook-Pro:xxx liuqi$ ./ffmpeg -v quiet -i
>>>>>>>>>>> ~/Movies/Test/bbb_sunflower_1080p_30fps_normal.mp4 -c copy -f hls
>>>>>>>>>>> -hls_list_size 4 -hls_segment_type fmp4 -hls_time 3 -t 50
>>>>>>>>>>> output_test.m3u8
>>>>>>>>>>> liuqideMacBook-Pro:xxx liuqi$ cat output_test.m3u8
>>>>>>>>>>> #EXTM3U
>>>>>>>>>>> #EXT-X-VERSION:7
>>>>>>>>>>> #EXT-X-TARGETDURATION:3
>>>>>>>>>>> #EXT-X-MEDIA-SEQUENCE:0
>>>>>>>>>>> #EXT-X-MAP:URI="init.mp4"
>>>>>>>>>>> #EXTINF:3.866667,
>>>>>>>>>>> output_test0.m4s
>>>>>>>>>>> #EXTINF:7.300000,
>>>>>>>>>>> output_test1.m4s
>>>>>>>>>>> #EXTINF:8.333333,
>>>>>>>>>>> output_test2.m4s
>>>>>>>>>>> #EXTINF:3.966667,
>>>>>>>>>>> output_test3.m4s
>>>>>>>>>>> #EXTINF:8.333333,
>>>>>>>>>>> output_test4.m4s
>>>>>>>>>>> #EXTINF:4.033333,
>>>>>>>>>>> output_test5.m4s
>>>>>>>>>>> #EXTINF:8.333333,
>>>>>>>>>>> output_test6.m4s
>>>>>>>>>>> #EXTINF:4.633333,
>>>>>>>>>>> output_test7.m4s
>>>>>>>>>>> liuqideMacBook-Pro:xxx liuqi$
>>>>>>>>>>> liuqideMacBook-Pro:xxx liuqi$
>>>>>>>>>>>
>>>>>>>>>>> the m3u8 list is incorrect, because users want control the m3u8
>>>>>>>>>>> list length, because their disk do not have enough space to save
>>>>>>>>>>> the fragments.
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Ok I will fix this.
>>>>>>>>
>>>>>>>>
>>>>>>>> I'm attaching a new patch that resolves all of these issues, while
>>>>>>>> still resolving this bug for VOD playlists.
>>>>>>>>
>>>>>>>> Can you please review?
>>>>>>>>
>>>>>>>>
>>>>>>>> <0001-libavformat-hlsenc-Fix-HLS-Manifest-Generation-from-.patch>
>>>>>>>
>>>>>>> From bbc4870c0d685f5c07e82042c3f2ef153d83f3d1 Mon Sep 17 00:00:00 2001
>>>>>>> From: "Ronak Patel (Audible)" <[email protected]>
>>>>>>> Date: Thu, 2 Aug 2018 09:25:12 -0400
>>>>>>> Subject: [PATCH] libavformat/hlsenc: Fix HLS Manifest Generation from
>>>>>>> an N^2
>>>>>>> algorithm to N.
>>>>>>>
>>>>>>> This fixes the creation of the hls manifest in hlsenc.c by writing the
>>>>>>> entire manifest at the end for VOD playlists. Live & Event Playlists
>>>>>>> are unaffected.
>>>>>>> This also fixes the behavior with HLS_TEMP_FILE to work correctly when
>>>>>>> -hlsflags temp_file is specified, instead of always relying on
>>>>>>> use_rename, which caused these problems.
>>>>>>>
>>>>>>> Files that would previously take over a week to fragment now take 1
>>>>>>> minute on the same hardware. This was a 153 hour audio file (2.2GB of
>>>>>>> audio).
>>>>>>>
>>>>>>> Signed-off-by: Ronak Patel <[email protected]>
>>>>>>> ---
>>>>>>> libavformat/dashenc.c | 2 +-
>>>>>>> libavformat/hlsenc.c | 54
>>>>>>> +++++++++++++++++++++++++++++++++------------------
>>>>>>> 2 files changed, 36 insertions(+), 20 deletions(-)
>>>>>>>
>>>>>>> diff --git a/libavformat/dashenc.c b/libavformat/dashenc.c
>>>>>>>
>>>>>>> -------you have modify dash
>>>>>>
>>>>>> Sorry I will submit this separately. Will remove.
>>>>>>
>>>>>>> index ae57fd5..ae22c08 100644
>>>>>>> --- a/libavformat/dashenc.c
>>>>>>> +++ b/libavformat/dashenc.c
>>>>>>> @@ -483,7 +483,7 @@ static void output_segment_list(OutputStream *os,
>>>>>>> AVIOContext *out, AVFormatCont
>>>>>>> target_duration = lrint(duration);
>>>>>>> }
>>>>>>>
>>>>>>> - ff_hls_write_playlist_header(c->m3u8_out, 6, -1,
>>>>>>> target_duration,
>>>>>>> + ff_hls_write_playlist_header(c->m3u8_out, 7, -1,
>>>>>>> target_duration,
>>>>>>> start_number, PLAYLIST_TYPE_NONE);
>>>>>>>
>>>>>>> ff_hls_write_init_file(c->m3u8_out, os->initfile, c->single_file,
>>>>>>> diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
>>>>>>> index b5644f0..0eb0801 100644
>>>>>>> --- a/libavformat/hlsenc.c
>>>>>>> +++ b/libavformat/hlsenc.c
>>>>>>> @@ -942,6 +942,7 @@ static int
>>>>>>> sls_flag_use_localtime_filename(AVFormatContext *oc, HLSContext *c, V
>>>>>>> if (c->flags & (HLS_SECOND_LEVEL_SEGMENT_SIZE |
>>>>>>> HLS_SECOND_LEVEL_SEGMENT_DURATION)) {
>>>>>>> av_strlcpy(vs->current_segment_final_filename_fmt, oc->url,
>>>>>>> sizeof(vs->current_segment_final_filename_fmt));
>>>>>>> +
>>>>>>> ——you add a empty line
>>>>>> Ok will remove
>>>>>>
>>>>>>> if (c->flags & HLS_SECOND_LEVEL_SEGMENT_SIZE) {
>>>>>>> char *filename = NULL;
>>>>>>> if (replace_int_data_in_filename(&filename, oc->url, 's', 0) < 1)
>>>>>>> {
>>>>>>> @@ -1166,9 +1167,10 @@ static int hls_rename_temp_file(AVFormatContext
>>>>>>> *s, AVFormatContext *oc)
>>>>>>>
>>>>>>> if (!final_filename)
>>>>>>> return AVERROR(ENOMEM);
>>>>>>> +
>>>>>>> ——you add a empty line
>>>>>> Ok will remove
>>>>>>>
>>>>>>> final_filename[len-4] = '\0';
>>>>>>> +
>>>>>>>
>>>>>>> ——you add a empty line
>>>>>> Ok will remove
>>>>>>> ret = ff_rename(oc->url, final_filename, s);
>>>>>>> - oc->url[len-4] = '\0’;
>>>>>>> ——Why do you give the len - 4 = 0?
>>>>>> This code was already there. All I’m doing is removing this part that
>>>>>> was causing a problem when you use the HLS_TEMP option.
>>>>>>
>>>>>>> av_freep(&final_filename);
>>>>>>> return ret;
>>>>>>> }
>>>>>>> @@ -1373,9 +1375,7 @@ static int hls_window(AVFormatContext *s, int
>>>>>>> last, VariantStream *vs)
>>>>>>> int ret = 0;
>>>>>>> char temp_filename[1024];
>>>>>>> int64_t sequence = FFMAX(hls->start_sequence, vs->sequence -
>>>>>>> vs->nb_entries);
>>>>>>> - const char *proto = avio_find_protocol_name(s->url);
>>>>>>> - int use_rename = proto && !strcmp(proto, "file");
>>>>>>> - static unsigned warned_non_file;
>>>>>>> + int use_temp_file = (s->flags & HLS_TEMP_FILE);
>>>>>>> ——What will have if use http put method?
>>>>>>
>>>>>> I’ll test it.
>>>>>>
>>>>>>> char *key_uri = NULL;
>>>>>>> char *iv_string = NULL;
>>>>>>> AVDictionary *options = NULL;
>>>>>>> @@ -1397,11 +1397,9 @@ static int hls_window(AVFormatContext *s, int
>>>>>>> last, VariantStream *vs)
>>>>>>> hls->version = 7;
>>>>>>> }
>>>>>>>
>>>>>>> - if (!use_rename && !warned_non_file++)
>>>>>>> - av_log(s, AV_LOG_ERROR, "Cannot use rename on non file
>>>>>>> protocol, this may lead to races and temporary partial files\n");
>>>>>>> -
>>>>>>> ——I have see this message long time, i have not remove this message
>>>>>>> because this is used to http method. Why do you remove it?
>>>>>>
>>>>>> I can keep it for http put and HLS_TEMP if that’s what you want.
>>>>>>
>>>>>>>
>>>>>>> set_http_options(s, &options, hls);
>>>>>>> - snprintf(temp_filename, sizeof(temp_filename), use_rename ?
>>>>>>> "%s.tmp" : "%s", vs->m3u8_name);
>>>>>>> + snprintf(temp_filename, sizeof(temp_filename), use_temp_file ?
>>>>>>> "%s.tmp" : "%s", vs->m3u8_name);
>>>>>>> + //av_log(s, AV_LOG_INFO, "We're going to write out to %s",
>>>>>>> temp_filename);
>>>>>>> ------this info message is unused?
>>>>>>
>>>>>> Ok will remove.
>>>>>>
>>>>>>> if ((ret = hlsenc_io_open(s, has->m3u8_out, temp_filename, &options)) <
>>>>>>> 0)
>>>>>>> goto fail;
>>>>>>>
>>>>>>> @@ -1472,8 +1470,9 @@ fail:
>>>>>>> av_dict_free(&options);
>>>>>>> hlsenc_io_close(s, &hls->m3u8_out, temp_filename);
>>>>>>> hlsenc_io_close(s, &hls->sub_m3u8_out, vs->vtt_m3u8_name);
>>>>>>> - if (ret >= 0 && use_rename)
>>>>>>> - ff_rename(temp_filename, vs->m3u8_name, s);
>>>>>>> + if (use_temp_file) {
>>>>>>> + ff_rename(temp_filename, vs->m3u8_name, s);
>>>>>>> + }
>>>>>>>
>>>>>>> if (ret >= 0 && hls->master_pl_name)
>>>>>>> if (create_master_playlist(s, vs) < 0)
>>>>>>> @@ -2253,11 +2252,14 @@ static int hls_write_packet(AVFormatContext *s,
>>>>>>> AVPacket *pkt)
>>>>>>> hlsenc_io_close(s, &vs->vtt_avf->pb, vs->vtt_avf->url);
>>>>>>> }
>>>>>>> }
>>>>>>> +
>>>>>>> + // look to rename the asset name
>>>>>>> if ((hls->flags & HLS_TEMP_FILE) && oc->url[0]) {
>>>>>>> - if (!(hls->flags & HLS_SINGLE_FILE) || (hls->max_seg_size
>>>>>>> <= 0))
>>>>>>> - if ((vs->avf->oformat->priv_class &&
>>>>>>> vs->avf->priv_data) && hls->segment_type != SEGMENT_TYPE_FMP4)
>>>>>>> - av_opt_set(vs->avf->priv_data, "mpegts_flags",
>>>>>>> "resend_headers", 0);
>>>>>>> - hls_rename_temp_file(s, oc);
>>>>>>> + if (!(hls->flags & HLS_SINGLE_FILE) || (hls->max_seg_size
>>>>>>> <= 0)) {
>>>>>>> + if ((vs->avf->oformat->priv_class &&
>>>>>>> vs->avf->priv_data) && hls->segment_type != SEGMENT_TYPE_FMP4) {
>>>>>>> + av_opt_set(vs->avf->priv_data, "mpegts_flags",
>>>>>>> "resend_headers", 0);
>>>>>>> + }
>>>>>>> + }
>>>>>>> ——Just reindent?
>>>>>>
>>>>>> Yes I put the code properly under braces. But if you don’t like it, I
>>>>>> can remove.
>>>>>>
>>>>>>> }
>>>>>>>
>>>>>>> if (vs->fmp4_init_mode) {
>>>>>>> @@ -2286,6 +2288,17 @@ static int hls_write_packet(AVFormatContext *s,
>>>>>>> AVPacket *pkt)
>>>>>>> return ret;
>>>>>>> }
>>>>>>> ff_format_io_close(s, &vs->out);
>>>>>>> +
>>>>>>> + // rename that segment from .tmp to the real one
>>>>>>> + if ((hls->flags & HLS_TEMP_FILE) && oc->url[0]) {
>>>>>>> + hls_rename_temp_file(s, oc);
>>>>>>> + av_free(old_filename);
>>>>>>> + old_filename = av_strdup(vs->avf->url);
>>>>>>> +
>>>>>>> + if (!old_filename) {
>>>>>>> + return AVERROR(ENOMEM);
>>>>>>> + }
>>>>>>> + }
>>>>>>> }
>>>>>>> }
>>>>>>>
>>>>>>> @@ -2334,14 +2347,16 @@ static int hls_write_packet(AVFormatContext *s,
>>>>>>> AVPacket *pkt)
>>>>>>> return ret;
>>>>>>> }
>>>>>>>
>>>>>>> - if (!vs->fmp4_init_mode || byterange_mode)
>>>>>>> + // 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) {
>>>>>>> ------Whatever event VOD or Live Streaming, the EXT-X-TARGETDURATION
>>>>>>> need refresh when lrint(current fragment duration) is large than
>>>>>>> lrint(the before duration).
>>>>>>
>>>>>> You do not need to do this for VOD. This is the main reason why ffmpeg
>>>>>> takes over 7 days to fragment a 153 hour VOD audio file. Other tools can
>>>>>> do it in less than 5 minutes. Why would you write the same VOD playlist
>>>>>> over 155000 times on disk when the input is never changing.
>>>>>>
>>>>>> VOD does not ever change once it is written so it makes sense to wait
>>>>>> until the very end to write out the entire manifest. There’s no
>>>>>> refreshing required. Only live or event playlists need any sort of
>>>>>> refresh. Ffmpeg is written predominantly for the event or live use case
>>>>>> I’ve noticed, which has forced you to make poor decisions for VOD.
>>>>>>
>>>>>> If I could I would rewrite all of this logic to clearly separate VOD
>>>>>> from event and live playlist generation logic to make the code clearer.
>>>>>> This is hard to understand code in general.
>>>>>
>>>>> Maybe you want record the fragments to a VOD Service, or time shift for
>>>>> the history stream. Do i guess right or wrong?
>>>>>>
>>>>
>>>> If that’s what you want, you would wait until the very end anyway. Why
>>>> would you upload a partial manifest file?
>>>>
>>>> For VOD, you don’t do anything until you get the whole manifest. If you
>>>> wanted a partial one, that’s an event, and you can pass that option to get
>>>> the refreshing behavior.
>>>>
>>>> Even with event, this algorithm of writing out the entire manifest just to
>>>> add a new segment is very wasteful, slow and unnecessary. This is an O(N!)
>>>> algorithm for something you can solve in O(N) time. You can just append
>>>> and adjust the EXT-X-TARGETDURATION for your video content.
>>> Yes, I agreed with you and cannot agreed more. O(N!), but is the list is
>>> too short, that is not a problem. But, why do you create a list long time
>>> to 7 days? The hls_list_size default is 5 fragments, and the hls live
>>> streaming (No Endlist) is play from last 3 fragment, i can not understand
>>> what do you want. let me make sure, do you want record long list? or maybe
>>> you want make some files to use disk?
>>>
>>
>> Hi Steven,
>>
>> Sorry it's taken me some time to get back to you. I was busy with other
>> things. So to clarify my exact situation and why this is a problem for me.
>> We have really long audio files that we stream over HLS & DASH. We always
>> stream in VOD mode. We DO NOT do any EVENT or LIVE streaming. Our audio
>> files are generally at least 10 hours long, but can be as long as 153 hours
>> long.
>>
>> So, in the trunk version of ffmpeg, if you try to run this command:
>>
>> ffmpeg -i output_22_32.aac -codec copy -hls_time 0.975238095238095
>> -hls_segment_type fmp4 -hls_flags single_file -hls_playlist_type vod
>> output_22_32_1sec_ts.m3u8
>>
>> The O(N!) algorithm that ffmpeg uses takes 7 days for this command to finish
>> executing. This is unacceptable for us, we need to be able to prepare our
>> content in seconds or minutes, not days or weeks.
>>
>> My patch is looking to resolve the crux of this issue which are:
>>
>> 1. The unnecessary creation/deletion of a temp file when I didn't even ask
>> for one (HLS_TEMP option wasn't specified).
>> 2. The unnecessary regeneration of the entire manifest when we are just
>> appending a new segment.
>>
>> I hope this context helps you understand the problem.
>>
>> I'll submit a new patch with your comments resolved shortly.
>>
>> Ronak
>>
>
> Hi Steven,
>
> Please see my new patch taking your feedback into account.
>
> Ronak
Hi Steven,
Did you have a chance to review? I’m going to send you a new patch for
dashenc.c shortly.
For dashenc.c, ffmpeg again always assumes we are doing live streaming. It
doesn’t even have another profile. I’m going to add a VOD profile to it and fix
this problem there. I will have to add a new cli parameter so we can specify
the profile now.
Ronak
>
>
>>>>
>>>>>>>
>>>>>>> if ((ret = hls_window(s, 0, vs)) < 0) {
>>>>>>> return ret;
>>>>>>> }
>>>>>>> + }
>>>>>>> }
>>>>>>>
>>>>>>> - vs->packets_written++;
>>>>>>> ret = ff_write_chained(oc, stream_index, pkt, s, 0);
>>>>>>> + vs->packets_written++;
>>>>>>>
>>>>>>> return ret;
>>>>>>> }
>>>>>>> @@ -2394,15 +2409,16 @@ failed:
>>>>>>> if (hls->segment_type != SEGMENT_TYPE_FMP4)
>>>>>>> ff_format_io_close(s, &oc->pb);
>>>>>>>
>>>>>>> - if ((hls->flags & HLS_TEMP_FILE) && oc->url[0]) {
>>>>>>> - hls_rename_temp_file(s, oc);
>>>>>>> + // rename that segment from .tmp to the real one
>>>>>>> + if ((hls->flags & HLS_TEMP_FILE) && oc->url[0] &&
>>>>>>> !(hls->flags & HLS_SINGLE_FILE)) {
>>>>>>> + hls_rename_temp_file(s, oc);
>>>>>>> av_free(old_filename);
>>>>>>> old_filename = av_strdup(vs->avf->url);
>>>>>>>
>>>>>>> if (!old_filename) {
>>>>>>> return AVERROR(ENOMEM);
>>>>>>> }
>>>>>>> - }
>>>>>>> + }
>>>>>>>
>>>>>>> /* after av_write_trailer, then duration + 1 duration per packet
>>>>>>> */
>>>>>>> hls_append_segment(s, hls, vs, vs->duration + vs->dpp,
>>>>>>> vs->start_pos, vs->size);
>>>>>>> --
>>>>>>> 2.6.3
>>>>>>>
>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>
>>> Thanks
>>> Steven
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
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>>> <mailto:[email protected] <mailto:[email protected]>>
>>> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>>> <http://ffmpeg.org/mailman/listinfo/ffmpeg-devel>
>>> <http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>>> <http://ffmpeg.org/mailman/listinfo/ffmpeg-devel>>
>> _______________________________________________
>> ffmpeg-devel mailing list
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>> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>> <http://ffmpeg.org/mailman/listinfo/ffmpeg-devel>
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