# HLS .ts error **URL:** \ **Category:** Wowza Streaming Engine\ **Created:** [May 20, 2014, 3:53pm UTC](https://community.wowza.com/t/hls-ts-error/43060 "2014-05-20T15:53:58Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![James\_Hurley](https://avatars.discourse-cdn.com/v4/letter/j/48db29/32.png) [@James\_Hurley](https://community.wowza.com/u/James_Hurley)\ **Post date:** [May 20, 2014, 3:53pm UTC](https://community.wowza.com/t/hls-ts-error/43060/1 "2014-05-20T15:53:58Z")
Hello I am seeing an occasional error in the HLS stream generated by Wowza. Not every chunk will have these problems, but I’m seeing roughly 50% do have them right now: ERROR: (-12703) failed to create format reader: unknown error ERROR: (-12703) failed to parse segment as either an MPEG-2 TS or an ES (this is gathered from the mediastreamvalidator tool) VLC doesn’t seem too bothered by it, unfortunately it interrupts playback with Quicktime and Safari’s tag. Edit: This error seemed to be caused by my encoder emitting 0-size AAC packets at the beginning of the stream. Fixing that fixed this problem. Thanks for your help. ---
**Author:** ![James\_Hurley](https://avatars.discourse-cdn.com/v4/letter/j/48db29/32.png) [@James\_Hurley](https://community.wowza.com/u/James_Hurley)\ **Post date:** [May 20, 2014, 3:57pm UTC](https://community.wowza.com/t/hls-ts-error/43060/2 "2014-05-20T15:57:58Z")
Update: reducing the cupertinoChunkDurationTarget to 2000 ms seems to reduce the number of errors significantly, but they still happen occasionally and it interrupts Safari and Quicktime playback. ---
**Author:** ![Richard\_Lanham](https://avatars.discourse-cdn.com/v4/letter/r/c68b51/32.png) [@Richard\_Lanham](https://community.wowza.com/u/Richard_Lanham)\ **Post date:** [May 22, 2014, 8:55pm UTC](https://community.wowza.com/t/hls-ts-error/43060/3 "2014-05-22T20:55:39Z")
Hi James, After the stream is published, Wowza starts cupertino packetizing and the first 10 of those are logged. They look something like this: ```auto LiveStreamPacketizerCupertino.endChunkTS[live/_definst_/Stream1]: Add chunk: id:1 mode:TS[H264,AAC] a/v/k:176/270/3 duration:11250 ``` Find those lines and show us all 10 of them. Above those lines, you will see audio and video info from the cupertino packetizer that look something like this: ```auto LiveStreamPacketizerCupertino.handlePacket[live/_definst_/Stream1][mp4a.40.2]: AAC Audio info: {AACFrame: codec:AAC, channels:2, frequency:48000, samplesPerFrame:1024, objectType:LC} LiveStreamPacketizerCupertino.handlePacket[live/_definst_/Stream1][avc1.66.30]: H.264 Video info: {H264CodecConfigInfo: codec:H264, profile:Baseline, level:3.0, frameSize:424x240, displaySize:424x240, frameRate:24.0, crop: l:0 r:4 t:0 b:0} ``` Please show those two also. Richard ---
**Author:** ![James\_Hurley](https://avatars.discourse-cdn.com/v4/letter/j/48db29/32.png) [@James\_Hurley](https://community.wowza.com/u/James_Hurley)\ **Post date:** [May 22, 2014, 12:13pm UTC](https://community.wowza.com/t/hls-ts-error/43060/4 "2014-05-22T12:13:51Z")
Strangely these errors only seem to happen in the first 30-60 seconds of the stream, afterward it seems to work fine. ---
**Author:** ![James\_Hurley](https://avatars.discourse-cdn.com/v4/letter/j/48db29/32.png) [@James\_Hurley](https://community.wowza.com/u/James_Hurley)\ **Post date:** [May 23, 2014, 10:30am UTC](https://community.wowza.com/t/hls-ts-error/43060/5 "2014-05-23T10:30:12Z")
Thanks for the reply, here’s the log info you requested: ```auto 2014-05-23 10:20:30 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.endChunkTS[live/_definst_/myStream]: Add chunk: id:1 mode:TS[H264,AAC] a/v/k:33/60/1 duration:2100 2014-05-23 10:20:32 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.endChunkTS[live/_definst_/myStream]: Add chunk: id:2 mode:TS[H264,AAC] a/v/k:36/60/1 duration:2000 2014-05-23 10:20:34 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.endChunkTS[live/_definst_/myStream]: Add chunk: id:3 mode:TS[H264,AAC] a/v/k:32/60/1 duration:2000 2014-05-23 10:20:36 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.endChunkTS[live/_definst_/myStream]: Add chunk: id:4 mode:TS[H264,AAC] a/v/k:29/60/1 duration:2000 2014-05-23 10:20:38 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.endChunkTS[live/_definst_/myStream]: Add chunk: id:5 mode:TS[H264,AAC] a/v/k:29/60/1 duration:2067 2014-05-23 10:20:40 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.endChunkTS[live/_definst_/myStream]: Add chunk: id:6 mode:TS[H264,AAC] a/v/k:29/60/1 duration:2000 2014-05-23 10:20:42 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.endChunkTS[live/_definst_/myStream]: Add chunk: id:7 mode:TS[H264,AAC] a/v/k:29/60/1 duration:2000 2014-05-23 10:20:44 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.endChunkTS[live/_definst_/myStream]: Add chunk: id:8 mode:TS[H264,AAC] a/v/k:28/60/1 duration:2000 2014-05-23 10:20:46 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.endChunkTS[live/_definst_/myStream]: Add chunk: id:9 mode:TS[H264,AAC] a/v/k:30/60/1 duration:2100 2014-05-23 10:20:48 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.endChunkTS[live/_definst_/myStream]: Add chunk: id:10 mode:TS[H264,AAC] a/v/k:31/60/1 duration:2100 2014-05-23 10:20:50 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.endChunkTS[live/_definst_/myStream]: Add chunk: id:11 mode:TS[H264,AAC] a/v/k:29/60/1 duration:2066 ``` ```auto 2014-05-23 10:20:28 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.handlePacket[live/_definst_/myStream]: Video codec:H264 isCompatible:true - - - 87868.614 2014-05-23 10:20:28 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.handlePacket[live/_definst_/myStream]: Audio codec:AAC isCompatible:true - - - 87868.615 2014-05-23 10:20:28 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.handlePacket[live/_definst_/myStream][mp4a.40.2]: AAC Audio info: {AACFrame: codec:AAC, channels:2, frequency:44100, samplesPerFrame:1024, objectType:LC} - - - 87868.615 2014-05-23 10:20:28 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.handlePacket[live/_definst_/myStream][avc1.66.30]: H.264 Video info: {H264CodecConfigInfo: codec:H264, profile:Baseline, level:3.0, frameSize:568x320, displaySize:568x320, crop: l:0 r:4 t:0 b:0} - - - 87868.615 ``` Here are two packets that correspond to errors I got from the mediastreamvalidator tool: ```auto 2014-05-23 11:58:44 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.endChunkTS[live/_definst_/myStream]: Add chunk: id:2 mode:TS[H264,AAC] a/v/k:33/60/1 duration:2000 - - - 93764.51 2014-05-23 11:58:46 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.endChunkTS[live/_definst_/myStream]: Add chunk: id:3 mode:TS[H264,AAC] a/v/k:29/60/1 duration:2000 - - - 93766.528 ``` And one that did not have an error: ```auto 2014-05-23 11:58:48 PDT comment server INFO 200 - LiveStreamPacketizerCupertino.endChunkTS[live/_definst_/myStream]: Add chunk: id:4 mode:TS[H264,AAC] a/v/k:28/60/1 duration:2000 - - - 93768.48 ``` This is the mediastreamvalidator output (I’m assuming the \_{x}.ts in the chunk filenames corresponds to the id in the log file): ```auto mediastreamvalidator: Beta Version 1.1(131115) Validating http://127.0.0.1:1935/live/myStream/playlist.m3u8 Validating child playlist chunklist_w1907198250.m3u8 [751.37 kbits/sec] Segment processing interrupted: chunklist_w1907198250.m3u8 - 31 out of 31 segments processed... -------------------------------------------------------------------------------- http://127.0.0.1:1935/live/myStream/playlist.m3u8 -------------------------------------------------------------------------------- Playlist Syntax: Warning: (0:-12274) PROGRAM-ID has been deprecated and is no longer a valid attribute for #EXT-X-STREAM-INF --> #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=751372,CODECS="avc1.66.30, mp4a.40.2",RESOLUTION=568x320 Alternate playlist(s): -------------------------------------------------------------------------------- chunklist_w1907198250.m3u8 -------------------------------------------------------------------------------- Playlist Syntax: OK Processed 31 out of 31 segments: media_w1907198250_2.ts: ERROR: (-12703) failed to create format reader: unknown error ERROR: (-12703) failed to parse segment as either an MPEG-2 TS or an ES media_w1907198250_3.ts: ERROR: (-12703) failed to create format reader: unknown error ERROR: (-12703) failed to parse segment as either an MPEG-2 TS or an ES media_w1907198250_19.ts: ERROR: (-12703) failed to create format reader: unknown error ERROR: (-12703) failed to parse segment as either an MPEG-2 TS or an ES media_w1907198250_25.ts: ERROR: (-12703) failed to create format reader: unknown error ERROR: (-12703) failed to parse segment as either an MPEG-2 TS or an ES media_w1907198250_28.ts: ERROR: (-12703) failed to create format reader: unknown error ERROR: (-12703) failed to parse segment as either an MPEG-2 TS or an ES Average segment duration: 1.68 seconds Playlist target bitrate: 751.37 kbits/sec Segment bitrate: Average: 695.85 kbits/sec, Max: 769.30 kbits/sec Average segment structural overhead: 163.74 kbits/sec (23.53 %) ``` ---
**Author:** ![James\_Hurley](https://avatars.discourse-cdn.com/v4/letter/j/48db29/32.png) [@James\_Hurley](https://community.wowza.com/u/James_Hurley)\ **Post date:** [May 23, 2014, 1:50pm UTC](https://community.wowza.com/t/hls-ts-error/43060/6 "2014-05-23T13:50:05Z")
This error seems to correspond to kCMBlockBufferBadOffsetParameterErr which according to the Apple documentation “Indicates that the offset provided to an API is out of the range of the relevant CMBlockBuffer.”