Anyone help-ffmpeg command to convert MP4 with aac 5.1?

[nlandas@gmail.com]

Hello, Most of my files are encoded to h.264 with aac 5.1(6 channel) audio.

ffmpeg -i shows......
Video: h264 (Main), yuv420p, 720x480
Audio: aac, 48000 Hz, 5.1, s16, 221 kb/s

I apologize if this has been clearly covered in other threads. I've tried some alternative commands in other threads and upgraded my ffmpeg version. I'm on Windows 7 32-bit my client is a Samsung Captivate Android 2.2.

Obviously the default command and this one in particular......
ffmpeg -v 0 -ss %o -async 1 -i %s -f flv -b %bk -s %wx%h -acodec copy -

The video plays flawlessly on my Samsung Captivate but I get no audio. Obviously, ffmpeg isn't transcoding the audio into a format the flash can play in the browser. Is it possible for ffmpeg to tanscode the audio down to stereo?

I can provide any other information necessary but I'd imagine that if this is possible an ffmpeg expert might know the command to do so.

Thank you for any help.

[mintsoft]

Hi,

I think you'll probably have 2 problems, the codec and the number of channels.

ffmpeg -i shows......
Video: h264 (Main), yuv420p, 720x480
Audio: aac, 48000 Hz, 5.1, s16, 221 kb/s

ffmpeg -v 0 -ss %o -async 1 -i %s -f flv -b %bk -s %wx%h -acodec copy -

The -acodec copy means that FFMpeg will just pass through the audio without transcoding it (see: http://www.ffmpeg.org/ffmpeg-doc.html#SEC8).

I've not tested this with subsonic, but try the following:

Code: Select all

ffmpeg -v 0 -ss %o -async 1 -i %s -f flv -b %bk -s %wx%h -acodec mp3 -ab 128k -ac 2 -ar 44100 -

This should work if your FFMpeg can encode to mp3; if not, you can try -acodec libmp3lame.

-Rob

[nlandas@gmail.com]

Hi,

I think you'll probably have 2 problems, the codec and the number of channels.

I've not tested this with subsonic, but try the following:

Code: Select all

ffmpeg -v 0 -ss %o -async 1 -i %s -f flv -b %bk -s %wx%h -acodec mp3 -ab 128k -ac 2 -ar 44100 -

This should work if your FFMpeg can encode to mp3; if not, you can try -acodec libmp3lame.

-Rob

Thanks Rob, Really cool of you to help. I tried the line with both the -acodec mp3 or libmp3lame and I'm getting an access denied or file not found error now. I'll keep playing until I work that out and then just try adding those -acodec parameters you mention.

Any ideas as to what might be causing the access denied or file not found error?

[mintsoft]

Thanks Rob, Really cool of you to help. I tried the line with both the -acodec mp3 or libmp3lame and I'm getting an access denied or file not found error now. I'll keep playing until I work that out and then just try adding those -acodec parameters you mention.

Any ideas as to what might be causing the access denied or file not found error?

Hmm, the only thing that springs to mind is that you may have removed the "-" from the end of the line? It may look like a mistake but you need that to indicate that the output should go to stdout rather than replacing the input video.

Alternatively it could be that the ffmpeg doesn't have the capability to transcode to mp3, so you could try -acodec mp2 or use:
ffmpeg -formats or ffmpeg -codecs depending on your version to list available codecs.

[nlandas@gmail.com]

Thanks Rob, Really cool of you to help. I tried the line with both the -acodec mp3 or libmp3lame and I'm getting an access denied or file not found error now. I'll keep playing until I work that out and then just try adding those -acodec parameters you mention.

Any ideas as to what might be causing the access denied or file not found error?

Hmm, the only thing that springs to mind is that you may have removed the "-" from the end of the line? It may look like a mistake but you need that to indicate that the output should go to stdout rather than replacing the input video.

Alternatively it could be that the ffmpeg doesn't have the capability to transcode to mp3, so you could try -acodec mp2 or use:
ffmpeg -formats or ffmpeg -codecs depending on your version to list available codecs.

Interesting, I did leave in the '-', I figured it had something to do. (stdout makes sense.)

Can you give me your default transcode line for MP4->FLV? I believe I have the default back in there now and I can't even get the videos to play without audio now. This is without the -acodec line.

I just checked and MP3 is supported by my ffmpeg build but not for encoding. If I can get the video to display again from MP4->FLV then I'll start adding the acodec lines to play. I can play other videos like avi without problem. It's just the MP4->FLV that gives the access denied error.

Here is my line 'ffmpeg -ss %o -i %s -b %bk -s %wx%h -ar 44100 -ac 2 -v 0 -f flv -'

Here are the codecs my ffmpeg support->
Codecs:
D..... = Decoding supported
.E.... = Encoding supported
..V... = Video codec
..A... = Audio codec
..S... = Subtitle codec
...S.. = Supports draw_horiz_band
....D. = Supports direct rendering method 1
.....T = Supports weird frame truncation
------
D V D 4xm 4X Movie
D V D 8bps QuickTime 8BPS video
D A 8svx_exp 8SVX exponential
D A 8svx_fib 8SVX fibonacci
D V D FRWU Forward Uncompressed
EV a64multi Multicolor charset for Commodore 64
EV a64multi5 Multicolor charset for Commodore 64, extended with 5th color (colram)
DEA aac Advanced Audio Coding
D A aac_latm AAC LATM (Advanced Audio Codec LATM syntax)
D V D aasc Autodesk RLE
DEA ac3 ATSC A/52A (AC-3)
EA ac3_fixed ATSC A/52A (AC-3)
D A adpcm_4xm ADPCM 4X Movie
DEA adpcm_adx SEGA CRI ADX ADPCM
D A adpcm_ct ADPCM Creative Technology
D A adpcm_ea ADPCM Electronic Arts
D A adpcm_ea_maxis_xa ADPCM Electronic Arts Maxis CDROM XA
D A adpcm_ea_r1 ADPCM Electronic Arts R1
D A adpcm_ea_r2 ADPCM Electronic Arts R2
D A adpcm_ea_r3 ADPCM Electronic Arts R3
D A adpcm_ea_xas ADPCM Electronic Arts XAS
D A adpcm_ima_amv ADPCM IMA AMV
D A adpcm_ima_dk3 ADPCM IMA Duck DK3
D A adpcm_ima_dk4 ADPCM IMA Duck DK4
D A adpcm_ima_ea_eacs ADPCM IMA Electronic Arts EACS
D A adpcm_ima_ea_sead ADPCM IMA Electronic Arts SEAD
D A adpcm_ima_iss ADPCM IMA Funcom ISS
DEA adpcm_ima_qt ADPCM IMA QuickTime
D A adpcm_ima_smjpeg ADPCM IMA Loki SDL MJPEG
DEA adpcm_ima_wav ADPCM IMA WAV
D A adpcm_ima_ws ADPCM IMA Westwood
DEA adpcm_ms ADPCM Microsoft
D A adpcm_sbpro_2 ADPCM Sound Blaster Pro 2-bit
D A adpcm_sbpro_3 ADPCM Sound Blaster Pro 2.6-bit
D A adpcm_sbpro_4 ADPCM Sound Blaster Pro 4-bit
DEA adpcm_swf ADPCM Shockwave Flash
D A adpcm_thp ADPCM Nintendo Gamecube THP
D A adpcm_xa ADPCM CDROM XA
DEA adpcm_yamaha ADPCM Yamaha
DEA alac ALAC (Apple Lossless Audio Codec)
D A als MPEG-4 Audio Lossless Coding (ALS)
D A amrnb Adaptive Multi-Rate NarrowBand
D A amrwb Adaptive Multi-Rate WideBand
D V D amv AMV Video
D V D anm Deluxe Paint Animation
D V D ansi ASCII/ANSI art
D A ape Monkey's Audio
DES ass Advanced SubStation Alpha subtitle
DEV D asv1 ASUS V1
DEV D asv2 ASUS V2
D A atrac1 Atrac 1 (Adaptive TRansform Acoustic Coding)
D A atrac3 Atrac 3 (Adaptive TRansform Acoustic Coding 3)
D V D aura Auravision AURA
D V D aura2 Auravision Aura 2
D V D avs AVS (Audio Video Standard) video
D V D bethsoftvid Bethesda VID video
D V D bfi Brute Force & Ignorance
D A binkaudio_dct Bink Audio (DCT)
D A binkaudio_rdft Bink Audio (RDFT)
D V binkvideo Bink video
DEV D bmp BMP image
D V D c93 Interplay C93
D V D camstudio CamStudio
D V D camtasia TechSmith Screen Capture Codec
D V D cavs Chinese AVS video (AVS1-P2, JiZhun profile)
D V D cdgraphics CD Graphics video
D V D cinepak Cinepak
D V D cljr Cirrus Logic AccuPak
D A cook COOK
D V D cyuv Creative YUV (CYUV)
D A dca DCA (DTS Coherent Acoustics)
D V D dfa Chronomaster DFA
DEV D dnxhd VC3/DNxHD
DEV dpx DPX image
D A dsicinaudio Delphine Software International CIN audio
D V D dsicinvideo Delphine Software International CIN video
DES dvbsub DVB subtitles
DES dvdsub DVD subtitles
DEV D dvvideo DV (Digital Video)
D V D dxa Feeble Files/ScummVM DXA
D A eac3 ATSC A/52B (AC-3, E-AC-3)
D V D eacmv Electronic Arts CMV video
D V D eamad Electronic Arts Madcow Video
D V D eatgq Electronic Arts TGQ video
D V eatgv Electronic Arts TGV video
D V D eatqi Electronic Arts TQI Video
D V D escape124 Escape 124
DEV D ffv1 FFmpeg video codec #1
DEVSD ffvhuff Huffyuv FFmpeg variant
DEA flac FLAC (Free Lossless Audio Codec)
DEV D flashsv Flash Screen Video
D V D flic Autodesk Animator Flic video
DEVSD flv Flash Video (FLV) / Sorenson Spark / Sorenson H.263
D V D fraps Fraps
DEA g722 G.722 ADPCM
DEA g726 G.726 ADPCM
DEV D gif GIF (Graphics Interchange Format)
D A gsm GSM
D A gsm_ms GSM Microsoft variant
DEV D h261 H.261
DEVSDT h263 H.263 / H.263-1996
D VSD h263i Intel H.263
EV h263p H.263+ / H.263-1998 / H.263 version 2
D V D h264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
DEVSD huffyuv Huffyuv / HuffYUV
D V D idcinvideo id Quake II CIN video
D V D iff_byterun1 IFF ByteRun1
D V D iff_ilbm IFF ILBM
D A imc IMC (Intel Music Coder)
D V D indeo2 Intel Indeo 2
D V D indeo3 Intel Indeo 3
D V indeo5 Intel Indeo Video Interactive 5
D A interplay_dpcm DPCM Interplay
D V D interplayvideo Interplay MVE video
DEV D jpegls JPEG-LS
D V D jv Bitmap Brothers JV video
D V kgv1 Kega Game Video
D V D kmvc Karl Morton's video codec
D V D lagarith Lagarith lossless
DEA libgsm libgsm GSM
DEA libgsm_ms libgsm GSM Microsoft variant
EA libmp3lame libmp3lame MP3 (MPEG audio layer 3)
DEA libopencore_amrnb OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band
D A libopencore_amrwb OpenCORE Adaptive Multi-Rate (AMR) Wide-Band
D V D libopenjpeg OpenJPEG based JPEG 2000 decoder
DEV libschroedinger libschroedinger Dirac 2.2
D A libspeex libspeex Speex
EV libtheora libtheora Theora
EA libvorbis libvorbis Vorbis
DEV libvpx libvpx VP8
EV libx264 libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
EV libxavs libxavs - the Chinese Audio Video Standard Encoder
EV libxvid libxvidcore MPEG-4 part 2
EV ljpeg Lossless JPEG
D V D loco LOCO
D A mace3 MACE (Macintosh Audio Compression/Expansion) 3:1
D A mace6 MACE (Macintosh Audio Compression/Expansion) 6:1
D V D mdec Sony PlayStation MDEC (Motion DECoder)
D V D mimic Mimic
DEV D mjpeg MJPEG (Motion JPEG)
D V D mjpegb Apple MJPEG-B
D A mlp MLP (Meridian Lossless Packing)
D V D mmvideo American Laser Games MM Video
D V D motionpixels Motion Pixels video
D A mp1 MP1 (MPEG audio layer 1)
D A mp1float MP1 (MPEG audio layer 1)
DEA mp2 MP2 (MPEG audio layer 2)
D A mp2float MP2 (MPEG audio layer 2)
D A mp3 MP3 (MPEG audio layer 3)
D A mp3adu ADU (Application Data Unit) MP3 (MPEG audio layer 3)
D A mp3adufloat ADU (Application Data Unit) MP3 (MPEG audio layer 3)
D A mp3float MP3 (MPEG audio layer 3)
D A mp3on4 MP3onMP4
D A mp3on4float MP3onMP4
D A mpc7 Musepack SV7
D A mpc8 Musepack SV8
DEVSDT mpeg1video MPEG-1 video
DEVSDT mpeg2video MPEG-2 video
DEVSDT mpeg4 MPEG-4 part 2
D VSDT mpegvideo MPEG-1 video
DEVSD msmpeg4 MPEG-4 part 2 Microsoft variant version 3
DEVSD msmpeg4v1 MPEG-4 part 2 Microsoft variant version 1
DEVSD msmpeg4v2 MPEG-4 part 2 Microsoft variant version 2
D V D msrle Microsoft RLE
D V D msvideo1 Microsoft Video 1
D V D mszh LCL (LossLess Codec Library) MSZH
DEA nellymoser Nellymoser Asao
D V D nuv NuppelVideo/RTJPEG
DEV D pam PAM (Portable AnyMap) image
DEV D pbm PBM (Portable BitMap) image
DEA pcm_alaw PCM A-law
D A pcm_bluray PCM signed 16|20|24-bit big-endian for Blu-ray media
D A pcm_dvd PCM signed 20|24-bit big-endian
DEA pcm_f32be PCM 32-bit floating point big-endian
DEA pcm_f32le PCM 32-bit floating point little-endian
DEA pcm_f64be PCM 64-bit floating point big-endian
DEA pcm_f64le PCM 64-bit floating point little-endian
D A pcm_lxf PCM signed 20-bit little-endian planar
DEA pcm_mulaw PCM mu-law
DEA pcm_s16be PCM signed 16-bit big-endian
DEA pcm_s16le PCM signed 16-bit little-endian
D A pcm_s16le_planar PCM 16-bit little-endian planar
DEA pcm_s24be PCM signed 24-bit big-endian
DEA pcm_s24daud PCM D-Cinema audio signed 24-bit
DEA pcm_s24le PCM signed 24-bit little-endian
DEA pcm_s32be PCM signed 32-bit big-endian
DEA pcm_s32le PCM signed 32-bit little-endian
DEA pcm_s8 PCM signed 8-bit
DEA pcm_u16be PCM unsigned 16-bit big-endian
DEA pcm_u16le PCM unsigned 16-bit little-endian
DEA pcm_u24be PCM unsigned 24-bit big-endian
DEA pcm_u24le PCM unsigned 24-bit little-endian
DEA pcm_u32be PCM unsigned 32-bit big-endian
DEA pcm_u32le PCM unsigned 32-bit little-endian
DEA pcm_u8 PCM unsigned 8-bit
DEA pcm_zork PCM Zork
DEV D pcx PC Paintbrush PCX image
DEV D pgm PGM (Portable GrayMap) image
DEV D pgmyuv PGMYUV (Portable GrayMap YUV) image
D S pgssub HDMV Presentation Graphic Stream subtitles
D V D pictor Pictor/PC Paint
DEV D png PNG image
DEV D ppm PPM (Portable PixelMap) image
D V D ptx V.Flash PTX image
D A qcelp QCELP / PureVoice
D A qdm2 QDesign Music Codec 2
D V D qdraw Apple QuickDraw
D V D qpeg Q-team QPEG
DEV D qtrle QuickTime Animation (RLE) video
D V D r10k AJA Kona 10-bit RGB Codec
D V D r210 Uncompressed RGB 10-bit
DEV rawvideo raw video
DEA real_144 RealAudio 1.0 (14.4K) encoder
D A real_288 RealAudio 2.0 (28.8K)
D V D rl2 RL2 video
DEA roq_dpcm id RoQ DPCM
DEV D roqvideo id RoQ video
D V D rpza QuickTime video (RPZA)
DEV D rv10 RealVideo 1.0
DEV D rv20 RealVideo 2.0
D V D rv30 RealVideo 3.0
D V D rv40 RealVideo 4.0
DEV sgi SGI image
D A shorten Shorten
D A sipr RealAudio SIPR / ACELP.NET
D A smackaud Smacker audio
D V D smackvid Smacker video
D V D smc QuickTime Graphics (SMC)
DEV D snow Snow
D A sol_dpcm DPCM Sol
DEA sonic Sonic
EA sonicls Sonic lossless
D V D sp5x Sunplus JPEG (SP5X)
DES srt SubRip subtitle
D V D sunrast Sun Rasterfile image
DEV D svq1 Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1
D VSD svq3 Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3
DEV D targa Truevision Targa image
D VSD theora Theora
D V D thp Nintendo Gamecube THP video
D V D tiertexseqvideo Tiertex Limited SEQ video
DEV D tiff TIFF image
D V D tmv 8088flex TMV
D A truehd TrueHD
D V D truemotion1 Duck TrueMotion 1.0
D V D truemotion2 Duck TrueMotion 2.0
D A truespeech DSP Group TrueSpeech
D A tta True Audio (TTA)
D A twinvq VQF TwinVQ
D V D txd Renderware TXD (TeXture Dictionary) image
D V D ultimotion IBM UltiMotion
DEV D v210 Uncompressed 4:2:2 10-bit
D V D v210x Uncompressed 4:2:2 10-bit
D V vb Beam Software VB
D V D vc1 SMPTE VC-1
D V D vcr1 ATI VCR1
D A vmdaudio Sierra VMD audio
D V D vmdvideo Sierra VMD video
D V D vmnc VMware Screen Codec / VMware Video
DEA vorbis Vorbis
D VSD vp3 On2 VP3
D V D vp5 On2 VP5
D V D vp6 On2 VP6
D V D vp6a On2 VP6 (Flash version, with alpha channel)
D V D vp6f On2 VP6 (Flash version)
D V D vp8 On2 VP8
D V D vqavideo Westwood Studios VQA (Vector Quantized Animation) video
D A wavpack WavPack
D A wmapro Windows Media Audio 9 Professional
DEA wmav1 Windows Media Audio 1
DEA wmav2 Windows Media Audio 2
D A wmavoice Windows Media Audio Voice
DEVSD wmv1 Windows Media Video 7
DEVSD wmv2 Windows Media Video 8
D V D wmv3 Windows Media Video 9
D V D wnv1 Winnov WNV1
D A ws_snd1 Westwood Audio (SND1)
D A xan_dpcm DPCM Xan
D V D xan_wc3 Wing Commander III / Xan
D V D xan_wc4 Wing Commander IV / Xxan
D V D xl Miro VideoXL
DES xsub DivX subtitles (XSUB)
D V yop Psygnosis YOP Video
DEV D zlib LCL (LossLess Codec Library) ZLIB
DEV D zmbv Zip Motion Blocks Video

[mintsoft]

Interesting, I did leave in the '-', I figured it had something to do. (stdout makes sense.)

Can you give me your default transcode line for MP4->FLV? I believe I have the default back in there now and I can't even get the videos to play without audio now. This is without the -acodec line.

The default line I have on my install here is:

Code: Select all

ffmpeg -ss %o -i %s -async 1 -b %bk -s %wx%h -ar 44100 -ac 2 -v 0 -f flv -

I just checked and MP3 is supported by my ffmpeg build but not for encoding. If I can get the video to display again from MP4->FLV then I'll start adding the acodec lines to play. I can play other videos like avi without problem. It's just the MP4->FLV that gives the access denied error.

Here is my line 'ffmpeg -ss %o -i %s -b %bk -s %wx%h -ar 44100 -ac 2 -v 0 -f flv -'

From your codec list, you should be able to use libmp3lame, (EA libmp3lame libmp3lame MP3 (MPEG audio layer 3) ). Have you tried using mp2 or one of the uncompressed audio codecs to see if you can transcode audio at all.

I'll have a play on my install when I get home and see if I can get it to work.

[nlandas@gmail.com]

From your codec list, you should be able to use libmp3lame, (EA libmp3lame libmp3lame MP3 (MPEG audio layer 3) ). Have you tried using mp2 or one of the uncompressed audio codecs to see if you can transcode audio at all.

I'll have a play on my install when I get home and see if I can get it to work.

That's what I thought too. The strange thing is that the videos used to play fine without audio using the default ffmpeg encode line but now all I get on MP4s is the access denied error. What does your working encode string look like - I'd like to get it back to playing videos(even without audio) first.

I had...
ffmpeg -ss %o -i %s -async 1 -b %bk -s %wx%h -ar 44100 -ac 2 -v 0 -f flv -
I've tried....
ffmpeg -ss %o -i %s -b %bk -s %wx%h -ar 44100 -ac 2 -v 0 -f flv -

I did try also adding
ffmpeg -ss %o -i %s -b %bk -s %wx%h -ar 44100 -ac 2 -v 0 -acodec libmp3lame -f flv -

I'm really at a loss as to what changed to make MP4s stop working. I thought I backed up the default encode string and I kept the older ffmpeg but putting it back in place doesn't change the error either.

This is weird and thanks again for the help. I'm not an ffmpeg expert but I am very computer saavy and I only changed two things the ffmpeg version and the encode string - so one would think putting them back would get me back to at least video working.

[nlandas@gmail.com]

Found this buried in a post by stozher.............

ffmpeg -v 0 -ss %o -async 1 -i %s -f flv -b %bk -s %wx%h -acodec copy -

Video and audio are working in Firefox on my desktop now.

I'm going to grab my Android phone.......
Ok, the Android is back to video without audio, now I can play with the -acodec setting to see if I can get audio working both places.

So, if I change the -acodec copy to anything else like mp3(we know my ffmpeg doesn't have), libmp3lame or mp2 - it immediately goes back to the access denied error.

I'm at a loss, perhaps there is a two stage decode that would work to get my audio encoded. I'm just not expert enough in ffmpeg.

My ffmpeg seems to emply that it should fully support libmp3lame both in the codec list and the configuration listed. Is there a trick to tell ffmpeg where the lame encoder is? I'd think having it in the same directory would be enough.

FFmpeg version git-N-29181-ga304071, Copyright (c) 2000-2011 the FFmpeg developers
built on Apr 18 2011 21:24:03 with gcc 4.5.2
configuration: --enable-gpl --enable-version3 --enable-runtime-cpudetect --ena
ble-memalign-hack --enable-avisynth --enable-bzlib --enable-frei0r --enable-libo
pencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --
enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger
--enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enabl
e-libx264 --enable-libxavs --enable-libxvid --enable-zlib --cross-prefix=i686-w6
4-mingw32- --target-os=mingw32 --arch=x86_32 --extra-cflags=-I/home/kyle/softwar
e/ffmpeg/external-libraries/win32/include --extra-ldflags=-L/home/kyle/software/
ffmpeg/external-libraries/win32/lib --pkg-config=pkg-config
libavutil 50. 40. 1 / 50. 40. 1
libavcodec 52.120. 0 / 52.120. 0
libavformat 52.108. 0 / 52.108. 0
libavdevice 52. 4. 0 / 52. 4. 0
libavfilter 1. 79. 0 / 1. 79. 0
libswscale 0. 13. 0 / 0. 13. 0

I have added the lame_enc.dll 3.98.4 alongside lame in the transcode directory. I'm not sure what I'm missing to make Windows be able to use the libmp3lame library to encode this to mp3.

[mintsoft]

I have added the lame_enc.dll 3.98.4 alongside lame in the transcode directory. I'm not sure what I'm missing to make Windows be able to use the libmp3lame library to encode this to mp3.

Just to urinate on that particular bonfire, ffmpeg has libmp3lame compiled in if it reports that it is supported. So you shoudn't need to worry about the correct location of the dll files etc.

I've just set my subsonic to attempt to transcode audio and I'm getting the same error (Video not found or access denied).

In my subsonic log (On the about page) I'm getting:

Code: Select all

[15/05/11 16:07:21 BST]   DEBUG   InputStreamReaderThread   (/var/subsonic/transcode/ffmpeg) Resampling with input channels greater than 2 unsupported.
[15/05/11 16:07:21 BST]   DEBUG   InputStreamReaderThread   (/var/subsonic/transcode/ffmpeg) Can not resample 6 channels @ 48000 Hz to 2 channels @ 44100 Hz


Does that tally with your experience?

I'll keep playing but I think I may have lead you astray. Transcoding video and sound from multiple channels down to 2 in one statement isn't quite as straight forward as I thought!

[nlandas@gmail.com]

Just to urinate on that particular bonfire, ffmpeg has libmp3lame compiled in if it reports that it is supported. So you shouldn't need to worry about the correct location of the dll files etc.

I've just set my subsonic to attempt to transcode audio and I'm getting the same error (Video not found or access denied).

In my subsonic log (On the about page) I'm getting:

Code: Select all

[15/05/11 16:07:21 BST]   DEBUG   InputStreamReaderThread   (/var/subsonic/transcode/ffmpeg) Resampling with input channels greater than 2 unsupported.
[15/05/11 16:07:21 BST]   DEBUG   InputStreamReaderThread   (/var/subsonic/transcode/ffmpeg) Can not resample 6 channels @ 48000 Hz to 2 channels @ 44100 Hz


Does that tally with your experience?

I'll keep playing but I think I may have lead you astray. Transcoding video and sound from multiple channels down to 2 in one statement isn't quite as straight forward as I thought!

I think you might have a slightly older ffmpeg, is that possible? I believe I saw the error you list described in another thread and they said update ffmpeg. I've got the latest build.

So please don't feel bad about my bonfire. You are the only one who has offered to help me and I really appreciate it. I'm not getting the exactly same listed in my log though. I really wish some other expert would jump in and school us both.

Any ffmpeg experts out there that can help with recoding the audio format listed in my first post....

I'm using this ....

Code: Select all

ffmpeg -ss %o -i %s -async 1 -b %bk -s %wx%h -ac 2 -acodec libmp3lame -v 0 -f flv -


Code: Select all

[5/15/11 12:47:30 PM EDT]    DEBUG   InputStreamReaderThread   (c:\subsonic\transcode\ffmpeg) Stream #0.0(eng): Video: flv, yuv420p, 656x360 [PAR 40:33 DAR 656:297], q=2-31, 1000 kb/s, 1k tbn, 23.98 tbc
[5/15/11 12:47:30 PM EDT]    DEBUG   InputStreamReaderThread   (c:\subsonic\transcode\ffmpeg) Metadata:
[5/15/11 12:47:30 PM EDT]    DEBUG   InputStreamReaderThread   (c:\subsonic\transcode\ffmpeg) creation_time : 2010-12-24 16:08:01
[5/15/11 12:47:30 PM EDT]    DEBUG   InputStreamReaderThread   (c:\subsonic\transcode\ffmpeg) Stream #0.1(eng): Audio: libmp3lame, 48000 Hz, 2 channels, s16, 64 kb/s
[5/15/11 12:47:30 PM EDT]    DEBUG   InputStreamReaderThread   (c:\subsonic\transcode\ffmpeg) Metadata:
[5/15/11 12:47:30 PM EDT]    DEBUG   InputStreamReaderThread   (c:\subsonic\transcode\ffmpeg) creation_time : 2010-12-24 16:08:01
[5/15/11 12:47:30 PM EDT]    DEBUG   InputStreamReaderThread   (c:\subsonic\transcode\ffmpeg) Stream mapping:
[5/15/11 12:47:30 PM EDT]    DEBUG   InputStreamReaderThread   (c:\subsonic\transcode\ffmpeg) Stream #0.0 -> #0.0
[5/15/11 12:47:30 PM EDT]    DEBUG   InputStreamReaderThread   (c:\subsonic\transcode\ffmpeg) Stream #0.1 -> #0.1
[5/15/11 12:47:30 PM EDT]    DEBUG   InputStreamReaderThread   (c:\subsonic\transcode\ffmpeg) Could not write header for output file #0 (incorrect codec parameters ?)


If I remove the -ac 2 from the above ffmpeg line, I seem to get further but still receive this error. I wonder if we aren't really close but just missing some of the concepts of ffmpeg.

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[5/15/11 12:55:51 PM EDT]    DEBUG   InputStreamReaderThread   (c:\subsonic\transcode\ffmpeg) Error while opening encoder for output stream #0.1 - maybe incorrect parameters such as bit_rate, rate, width or height


This must get frustrating for forum members who know ffpmeg backwards and forwards. We are probably missing a simple switch to properly set something about the audio recode from aac 5.1ch to mp3 2ch.

I bet this thread could help others if we can just figure it out. I can't be alone in creating most of my MP4 files with aac 5.1. I use Nero Recode.

[nlandas@gmail.com]

I managed to get where you are with the

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DEBUG   InputStreamReaderThread   (c:\subsonic\transcode\ffmpeg) Resampling with input channels greater than 2 unsupported.
[5/15/11 3:24:14 PM EDT]    DEBUG   InputStreamReaderThread   (c:\subsonic\transcode\ffmpeg) Can not resample 6 channels @ 48000 Hz to 2 channels @ 44100 Hz


But if I tell it the -ar 48000 that error goes away but then I think the flv can't handle 48000hz only 44100. I am getting so confused here.

[nlandas@gmail.com]

I managed to get where you are with the

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DEBUG   InputStreamReaderThread   (c:\subsonic\transcode\ffmpeg) Resampling with input channels greater than 2 unsupported.
[5/15/11 3:24:14 PM EDT]    DEBUG   InputStreamReaderThread   (c:\subsonic\transcode\ffmpeg) Can not resample 6 channels @ 48000 Hz to 2 channels @ 44100 Hz


But if I tell it the -ar 48000 that error goes away but then I think the flv can't handle 48000hz only 44100. I am getting so confused here.

I don't think it's possible to do on ffmpeg. This works in the browser and will play video on my Captivate with Android 2.2 but not audio. I'm thinking I'd need to use another transcoder.

I wonder if mencoder or some other one would support MP4(aac 5.1) to flv(mp3, 2 channel). Off I go on another quest.

Thanks for all the help.

ffmpeg -v 0 -ss %o -async 1 -i %s -f flv -b %bk -s %wx%h -acodec copy -

[mintsoft]

I managed to get where you are with the

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DEBUG   InputStreamReaderThread   (c:\subsonic\transcode\ffmpeg) Resampling with input channels greater than 2 unsupported.
[5/15/11 3:24:14 PM EDT]    DEBUG   InputStreamReaderThread   (c:\subsonic\transcode\ffmpeg) Can not resample 6 channels @ 48000 Hz to 2 channels @ 44100 Hz


But if I tell it the -ar 48000 that error goes away but then I think the flv can't handle 48000hz only 44100. I am getting so confused here.

I don't think it's possible to do on ffmpeg. This works in the browser and will play video on my Captivate with Android 2.2 but not audio. I'm thinking I'd need to use another transcoder.

I wonder if mencoder or some other one would support MP4(aac 5.1) to flv(mp3, 2 channel). Off I go on another quest.

Thanks for all the help.

ffmpeg -v 0 -ss %o -async 1 -i %s -f flv -b %bk -s %wx%h -acodec copy -

Yeah that's essentially the conclusion I've come to, I don't think that FFMpeg will transcode 5.1 down to stereo and 44100Hz mp3.

Sorry I couldn't be of more help!

[itsthesource]

I hope i'm not too late!

Here are the commands I use to convert my h.264 files encoded with aac 5.1 audio.

faad --downmix --quiet --stdio %s
lame -b 48 -S --resample 22.05 - -
ffmpeg -v 0 -i %s -i - -map 0.0 -map 1.0 -async 1 -b %bk -s %wx%h -f flv -acodec copy -

Adjust the bitrate & samplerate to suit your needs but this seemed to work fine on my droidx last night.

EDIT: I found that this didn't work with a large portion of my videos for an unknown reason. As an alternative solution, I thought that if I extracted the audio using ffmpeg & it's acodec copy feature that I would solve the problem. However, I was unable to pipe the output from such a command to an external program (something about nonseekable format i think...).

I ended up settling for adding a second audio track to the video files. Unfortunately this forced me to create my own script for transcoding videos because I needed to determine the stream value of the stereo audio. In other words, some files will only contain a stereo audio track (Stream #0.1) while some will contain 5.1 (Stream #0.1) & stereo (Stream #0.2) tracks. I'll list the contents of my scripts in a later post for those who have this problem in the future.