# LiveStreamRecord - CFR(Constant Frame Rate) Mode **URL:** \ **Category:** Wowza Streaming Engine\ **Created:** [June 17, 2014, 11:01pm UTC](https://community.wowza.com/t/livestreamrecord-cfr-constant-frame-rate-mode/42201 "2014-06-17T23:01:18Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Takatoshi\_Kato](https://avatars.discourse-cdn.com/v4/letter/t/bb73d2/32.png) [@Takatoshi\_Kato](https://community.wowza.com/u/Takatoshi_Kato)\ **Post date:** [June 17, 2014, 11:01pm UTC](https://community.wowza.com/t/livestreamrecord-cfr-constant-frame-rate-mode/42201/1 "2014-06-17T23:01:18Z")
Hi. I’m developing LiveStreamRecord Application to record a live. I can record videos on mp4 correctly. But mp4 file is VFR frame rate mode. Is it possible to change CFR frame rate mode? Regards Kato ---
**Author:** ![sal\_jefferson](https://avatars.discourse-cdn.com/v4/letter/s/6de8d8/32.png) [@sal\_jefferson](https://community.wowza.com/u/sal_jefferson)\ **Post date:** [June 17, 2014, 8:41am UTC](https://community.wowza.com/t/livestreamrecord-cfr-constant-frame-rate-mode/42201/2 "2014-06-17T08:41:50Z")
Hello there, Wowza records what is sent in. You can use the Wowza Transcoder to achieve a consistent frame rate (as well as many other features): [How to set up and run Wowza Transcoder AddOn for live streaming](https://www.wowza.com/docs/how-to-set-up-and-run-wowza-transcoder-for-live-streaming) [Wowza Transcoder AddOn Overview](https://www.wowza.com/docs/wowza-transcoder) Salvadore ---
**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:** [June 26, 2014, 4:57pm UTC](https://community.wowza.com/t/livestreamrecord-cfr-constant-frame-rate-mode/42201/3 "2014-06-26T16:57:50Z")
Hi Kato, Is the file a problem to use in anyway? Looking at a file recorded with Wowza HTTPLiveStreamRecord (but not a Transcoder rendition) with MediaInfo I see the same lines. These were from a recording made from mpeg-ts stream produced by VLC Frame rate mode : VFR Frame rate mode : Variable Frame rate : 23.212 Frame rate : 23.212 fps Original frame rate : 24.000 Original frame rate : 24.000 fps Minimum frame rate : 11.905 Minimum frame rate : 11.905 fps Maximum frame rate : 24.390 Maximum frame rate : 24.390 fps But when I playback the same file in RTMP client in Flash Builder, the onMetaData I see “videoframerate = 23.80952380952381” FFprobe reported 23.21 fps for the same stream. I cannot account for the slight difference in the reports of these 3rd party tools, but they agree closely. In a recording made from FMLE with 15ps and Key frame Frequency set to 3 seconds, the lines are the same but the range is much narrower: Frame rate mode : VFR Frame rate mode : Variable Frame rate : 15.026 Frame rate : 15.026 fps Original frame rate : 15.000 Original frame rate : 15.000 fps Minimum frame rate : 13.699 Minimum frame rate : 13.699 fps Maximum frame rate : 16.129 Maximum frame rate : 16.129 fps I also looked at recording from Wowza Transcoder renditions and it had similar info in MediaInfo. And I tried a recording with a template /Encode /KeyFrameInterval /FollowSource set to “false” on the VLC stream, but that no affect on the data shown in MediaInfo, it was the same range. Richard ---
**Author:** ![Helder\_Conde](https://avatars.discourse-cdn.com/v4/letter/h/ba9def/32.png) [@Helder\_Conde](https://community.wowza.com/u/Helder_Conde)\ **Post date:** [June 18, 2015, 3:15pm UTC](https://community.wowza.com/t/livestreamrecord-cfr-constant-frame-rate-mode/42201/4 "2015-06-18T15:15:42Z")
Has a solution to this been found? I’m streaming a file in Constant Frame Rate to Wowza, but Wowza records it to Variable Frame Rate. Is there a way to “force” it record in CBR? Thanks! Helder ---
**Author:** ![Takatoshi\_Kato](https://avatars.discourse-cdn.com/v4/letter/t/bb73d2/32.png) [@Takatoshi\_Kato](https://community.wowza.com/u/Takatoshi_Kato)\ **Post date:** [June 18, 2014, 3:28pm UTC](https://community.wowza.com/t/livestreamrecord-cfr-constant-frame-rate-mode/42201/5 "2014-06-18T15:28:20Z")
Hello Savadore, Thank you for reply, Environment I’m using is as follows. Regardless of the transcoding, Our problem is to be a VFR mode. Because our Filebase transcoder does not work correctly. Therefore I would like to change CFR frame rate mode. Any ideas? * * * [InputLiveSource] Sony IPCamera: SNC-VB630([http://www.sony.co.uk/pro/product/video-security-ip-cameras-fixed/snc-vb630/overview/](http://www.sony.co.uk/pro/product/video-security-ip-cameras-fixed/snc-vb630/overview/)) Source Video Info: Codec: H.264 Resolution: 1920x1080 High@L4.1 Framerate: 30 fps BitrateMode : CBR Bitrate : 8Mbps LiveSourceStreaming Protocol: RTSP WowzaStreamFile: vb630.stream(rtsp://IPAddress:554/media/video1) [Wowza Record File(Information using MediaInfo)] General name : vb630.stream\_720p.mp4 Format : MPEG-4 Format profile : Adobe Flash Codec ID : f4v File size : 26.4 MiB Duration : 1Min 22Sec Overall bit rate mode : VBR Mode Overall bit rate : 2 688 Kbps Video Info ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : Main@L3.1 Format settings, CABAC : Yes Format settings, ReFrames : 3 Frames Format settings, GOP : M=1, N=60 Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 1Min 22Sec Bit rate mode : VBR mode Bit rate : 2 589 Kbps Maximum bit rate : 1 430 Kbps Width : 1280 Height : 720 Display aspect ratio : 16:9 \*\* Frame rate mode : VFR Mode \*\* \*\* Frame rate : 29.970 fps \*\* \*\* Original frame rate : 14.990 fps \*\* \*\* Minimum frame rate : 29.412 fps \*\* \*\* Maximum frame rate : 30.303 fps \*\* Standard : NTSC Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bit Scan type : Progressive(PPF) Bits/(Pixel\*Frame) : 0.094 Stream size : 25.5 MiB (96%) Title : WowzaStreamingEngine * * * Thanks in advance. Kato ---
**Author:** ![Christian\_Siegert](https://avatars.discourse-cdn.com/v4/letter/c/a3d4f5/32.png) [@Christian\_Siegert](https://community.wowza.com/u/Christian_Siegert)\ **Post date:** [October 28, 2020, 2:49pm UTC](https://community.wowza.com/t/livestreamrecord-cfr-constant-frame-rate-mode/42201/6 "2020-10-28T14:49:38Z")
Same here. Encoder send CFR 50 and the downloaded file looks like: Frame rate mode : Variable Frame rate : 50.000 FPS Minimum frame rate : 47.619 FPS Maximum frame rate : 52.632 FPS