Title: Error while opening encoder for output stream #0:0 Last modified: August 22, 2016 --- # Error while opening encoder for output stream #0:0 * [rhyshudson](https://wordpress.org/support/users/rhyshudson/) * (@rhyshudson) * [11 years, 4 months ago](https://wordpress.org/support/topic/error-while-opening-encoder-for-output-stream-00/) * Every time we try to encode a video, we get the error Error while opening encoder for output stream #0:0 * Any ideas? * [https://wordpress.org/plugins/video-embed-thumbnail-generator/](https://wordpress.org/plugins/video-embed-thumbnail-generator/) Viewing 3 replies - 1 through 3 (of 3 total) * Plugin Author [Kyle Gilman](https://wordpress.org/support/users/kylegilman/) * (@kylegilman) * [11 years, 4 months ago](https://wordpress.org/support/topic/error-while-opening-encoder-for-output-stream-00/#post-5693568) * Please paste the full output of the FFMPEG test output area from the bottom of the FFMPEG Settings tab of the plugin settings page. Make sure you put the code between backticks so it’s formatted properly. * If there aren’t any errors in the test output, post a link to a video you’re having a problem with. Does it happen with every video? Have you ever been able to encode videos and did something change? * Thread Starter [rhyshudson](https://wordpress.org/support/users/rhyshudson/) * (@rhyshudson) * [11 years, 4 months ago](https://wordpress.org/support/topic/error-while-opening-encoder-for-output-stream-00/#post-5693571) * Hi, thanks for the quick response. It happens to all videos but only since we changed server. FFMPEG is installed. Am I missing something? * ``` ffmpeg version 2.2.1 Copyright (c) 2000-2014 the FFmpeg developers built on Apr 13 2014 13:00:18 with gcc 4.4.6 (GCC) 20120305 (Red Hat 4.4.6-4) configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --enable-runtime-cpudetect --enable-gpl --enable-version3 --enable-postproc --enable-avfilter --enable-pthreads --enable-x11grab --enable-vdpau --disable-avisynth --enable-frei0r --enable-libopencv --enable-libdc1394 --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --disable-stripping libavutil 52. 66.100 / 52. 66.100 libavcodec 55. 52.102 / 55. 52.102 libavformat 55. 33.100 / 55. 33.100 libavdevice 55. 10.100 / 55. 10.100 libavfilter 4. 2.100 / 4. 2.100 libswscale 2. 5.102 / 2. 5.102 libswresample 0. 18.100 / 0. 18.100 libpostproc 52. 3.100 / 52. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/dingvideo/public_html/wp-content/plugins/video-embed-thumbnail-generator/images/sample-video-h264.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf55.33.100 Duration: 00:00:01.02, start: 0.021333, bitrate: 123 kb/s Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 109 kb/s, 23.98 fps, 23.98 tbr, 11988 tbn, 47.95 tbc (default) Metadata: handler_name : VideoHandler Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 2 kb/s (default) Metadata: handler_name : SoundHandler Please use -b:a or -b:v, -b is ambiguous Codec AVOption rc_lookahead (Number of frames to look ahead for alternate reference frame selection) specified for output file #0 (/home/dingvideo/public_html/wp-content/uploads/sample-video-h264-480.mp4) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream. [NULL @ 0x1a91f60] [Eval @ 0x7fffd4628990] Undefined constant or missing '(' in 'chroma' [NULL @ 0x1a91f60] Unable to parse option value "+chroma" [NULL @ 0x1a91f60] Error setting option cmp to value +chroma. Output #0, mp4, to '/home/dingvideo/public_html/wp-content/uploads/sample-video-h264-480.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf55.33.100 Stream #0:0(eng): Video: h264, yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 90k tbn, 23.98 tbc (default) Metadata: handler_name : VideoHandler Stream #0:1(eng): Audio: aac, 48000 Hz, stereo, fltp, 128 kb/s (default) Metadata: handler_name : SoundHandler Stream mapping: Stream #0:0 -> #0:0 (h264 -> libx264) Stream #0:1 -> #0:1 (aac -> aac) Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height ``` * Plugin Author [Kyle Gilman](https://wordpress.org/support/users/kylegilman/) * (@kylegilman) * [11 years, 4 months ago](https://wordpress.org/support/topic/error-while-opening-encoder-for-output-stream-00/#post-5693574) * You have a new version of FFMPEG so you should disable the legacy FFMPEG options in the FFFMPEG settings tab. Viewing 3 replies - 1 through 3 (of 3 total) The topic ‘Error while opening encoder for output stream #0:0’ is closed to new replies. * ![](https://ps.w.org/video-embed-thumbnail-generator/assets/icon.svg?rev=2965979) * [Videopack](https://wordpress.org/plugins/video-embed-thumbnail-generator/) * [Frequently Asked Questions](https://wordpress.org/plugins/video-embed-thumbnail-generator/#faq) * [Support Threads](https://wordpress.org/support/plugin/video-embed-thumbnail-generator/) * [Active Topics](https://wordpress.org/support/plugin/video-embed-thumbnail-generator/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/video-embed-thumbnail-generator/unresolved/) * [Reviews](https://wordpress.org/support/plugin/video-embed-thumbnail-generator/reviews/) * 3 replies * 2 participants * Last reply from: [Kyle Gilman](https://wordpress.org/support/users/kylegilman/) * Last activity: [11 years, 4 months ago](https://wordpress.org/support/topic/error-while-opening-encoder-for-output-stream-00/#post-5693574) * Status: not resolved