Transcoder fails after upgrade

Hi,

after upgrading plex to version 1.0.0.2261 the transcoder does not work anymore. Direct play works fine.

I managed to trace down the problem to the following:

    Jun 24, 2016 20:00:56.850 [0x7fca95fff700] DEBUG - MDE: computed resolution bounding box of 640x480.
    Jun 24, 2016 20:00:56.850 [0x7fca95fff700] DEBUG - Scaled up video bitrate to 1785Kbps based on 1.500000x fudge factor.
    Jun 24, 2016 20:00:56.850 [0x7fca95fff700] DEBUG - MDE: E01 - Image in the Sand: selected media 0 / 4914
    Jun 24, 2016 20:00:56.850 [0x7fca95fff700] DEBUG - Found session GUID of 1p4xegbf81b in session start.
    Jun 24, 2016 20:00:56.851 [0x7fca95fff700] DEBUG - Cleaning directory for session 1p4xegbf81b ()
    Jun 24, 2016 20:00:56.851 [0x7fca95fff700] DEBUG - Starting a transcode session 1p4xegbf81b at offset -1.0 (state=2)
    Jun 24, 2016 20:00:56.851 [0x7fca95fff700] DEBUG - Streaming Resource: Added session 0x7fca99158260:p9ucokhfdk
    Jun 24, 2016 20:00:56.855 [0x7fca95fff700] DEBUG - [Universal] Using local file path instead of URL: /data/Serien/test.avi
    Jun 24, 2016 20:00:56.857 [0x7fca95fff700] DEBUG - Job running: FFMPEG_EXTERNAL_LIBS='/home/plex/Library/Application\ Support/Plex\ Media\ Server/Codecs/2c361e4-1071-linux-ubuntu-x86_64/' XDG_CACHE_HOME='/home/plex/Library/Application Support/Plex Media Server/Cache/' XDG_DATA_HOME='/usr/lib/plexmediaserver/Resources/' X_PLEX_TOKEN='xxxxxxxxxxxxxxxxxxxx' '/usr/lib/plexmediaserver/Resources/Plex Transcoder' '-codec:0' 'mpeg4' '-codec:#0x01' 'mp3' '-i' '/data/Serien/test.avi' '-filter_complex' '[0:0]scale=w=min(640\,iw):h=min(480\,ih):force_original_aspect_ratio=decrease[0]' '-map' '[0]' '-codec:0' 'libx264' '-crf:0' '18' '-pix_fmt:0' 'yuv420p' '-maxrate:0' '1785k' '-bufsize:0' '3570k' '-r:0' '25' '-preset:0' 'veryfast' '-x264opts:0' 'subme=2:me_range=4:rc_lookahead=20:me=hex' '-force_key_frames:0' 'expr:gte(t,0+n_forced*7)' '-map' '0:#0x01' '-codec:1' 'aac' '-ar:1' '48000' '-channel_layout:1' 'stereo' '-b:1' '256k' '-f' 'dash' '-use_timeline' '0' '-min_seg_duration' '7000000' '-skip_to_segment' '1' '-time_delta' '0.0625' '-avoid_negative_ts' 'disabled' '-map_metadata' '-1' '-map_chapters' '-1' '-movflags' '+faststart' 'dash' '-start_at_zero' '-copyts' '-vsync' 'cfr' '-y' '-nostats' '-loglevel' 'quiet' '-loglevel_plex' 'error' '-progressurl' 'http://127.0.0.1:32400/video/:/transcode/session/1p4xegbf81b/progress'
    Jun 24, 2016 20:00:56.876 [0x7fca957fe700] ERROR - [Transcoder] Unrecognized option 'crf:0'.
    Jun 24, 2016 20:00:56.879 [0x7fca9bffc700] ? - [Transcoder] Error splitting the argument list: Option not found
    Jun 24, 2016 20:00:56.880 [0x7fca95fff700] ERROR - Failed to start session successfully.
    Jun 24, 2016 20:00:56.880 [0x7fca95fff700] DEBUG - Streaming Resource: Terminating session 0x7fca99158260:p9ucokhfdk with reason Video conversion failed. The transcoder crashed or failed to start up.

I think the interesting line is this here:

ERROR - [Transcoder] Unrecognized option 'crf:0'.

Since i don´t know how the transcoder works i have updated x264 and ffmpeg to the following version on my Ubutu 14.04 64-bit:

FFMPEG: ffmpeg version N-80283-g84efdab
x264: x264 0.148.2643 5c65704, built on Feb 9 2016, gcc: 4.8.4