Transcoding fails every time.

Please check the permissions of your sites/____/files directory. The webserver user must be able to create subdirectories.

Closed because of lack of response.

Always failed. This my log:

/usr/bin/ffmpeg -i '/Users/Mike/htdocs/invisalign/core/sites/default/files/videos/original/building_exterior_video_update.wmv' -strict experimental -vcodec 'h264' -qscale '6' -s '640x360' -acodec 'aac' -ac '2' -pass '2' -passlogfile '/private/tmp/1365234654-515fd3deb0442-multipass' -y /private/tmp/1365234654-515fd3deb02bb.mp4
ffmpeg version 1.2-tessus Copyright (c) 2000-2013 the FFmpeg developers
built on Mar 15 2013 01:18:55 with llvm-gcc 4.2.1 (LLVM build 2336.1.00)
configuration: --prefix=/Users/tessus/data/ext/ffmpeg/sw --as=yasm --extra-version=tessus --disable-shared --enable-static --disable-ffplay --enable-gpl --enable-pthreads --enable-postproc --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-libspeex --enable-bzlib --enable-zlib --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libxavs --enable-version3 --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvpx --enable-libgsm --enable-libopus --enable-fontconfig --enable-libfreetype --enable-libass --enable-filters --enable-runtime-cpudetect
libavutil 52. 18.100 / 52. 18.100
libavcodec 54. 92.100 / 54. 92.100
libavformat 54. 63.104 / 54. 63.104
libavdevice 54. 3.103 / 54. 3.103
libavfilter 3. 42.103 / 3. 42.103
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
[wmv3 @ 0x10203bc00] Extra data: 8 bits left, value: 0
[asf @ 0x102016400] max_analyze_duration 5000000 reached at 5100000 microseconds
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, asf, from '/Users/Mike/htdocs/invisalign/core/sites/default/files/videos/original/building_exterior_video_update.wmv':
Metadata:
WMFSDKNeeded : 0.0.0.0000
DeviceConformanceTemplate: MP
WMFSDKVersion : 12.0.7601.17514
IsVBR : 0
Duration: 00:02:40.47, start: 0.000000, bitrate: 16700 kb/s
Stream #0:0: Video: mjpeg, yuvj420p, 1440x1080, 90k tbr, 90k tbn, 90k tbc
Metadata:
comment : Movie/video screen capture
Stream #0:1: Audio: wmav2 (a[1][0][0] / 0x0161), 48000 Hz, stereo, fltp, 192 kb/s
Stream #0:2: Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p, 1440x1080, 24000 kb/s, 29.97 tbr, 1k tbn, 1k tbc
Please use -q:a or -q:v, -qscale is ambiguous
[libx264 @ 0x1020e0200] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.1 Cache64
[libx264 @ 0x1020e0200] constant rate-factor is incompatible with 2pass.
Output #0, mp4, to '/private/tmp/1365234654-515fd3deb02bb.mp4':
Metadata:
WMFSDKNeeded : 0.0.0.0000
DeviceConformanceTemplate: MP
WMFSDKVersion : 12.0.7601.17514
IsVBR : 0
Stream #0:0: Video: h264, yuv420p, 640x360, q=-1--1, pass 2, 90k tbn, 29.97 tbc
Stream #0:1: Audio: none, 48000 Hz, stereo, fltp, 128 kb/s
Stream mapping:
Stream #0:2 -> #0:0 (wmv3 -> libx264)
Stream #0:1 -> #0:1 (wmav2 -> aac)
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

The error is:

[libx264 @ 0x1020e0200] constant rate-factor is incompatible with 2pass.

Solution: Either enable "Force one-pass encoding" for your preset, or set the "Video bitrate" setting to some bitrate.

Thanks. It woks by your solution.

Is the 2pass necessary?

This is help text for video bitrate:
"A target bitrate in kbps. Not necessary if you select a Video Quality setting, unless you want to target a specific bitrate."
It's a little confusing.

There would be use-cases for a targeting a specific bit-rate, like storage constraints. In that case, two-pass helps you achieve a better visual result by first examining the input data in pass one and then doing the actual transcoding in pass two. In that sense, the encoder knows "what's coming" and is better able to target the bitrate you want. I should perhaps add code that ignores two-pass when no bit rate has been entered.