September 2008 - ffmpeg-user - lists.ffmpeg.org

Hi, Can you help please...
by malcolm_samuels＠hotmail.com 26 Sep '08

26 Sep '08

Re: ffmpeg ( http://ffmpeg.mplayerhq.hu/index.html ) Hi, ffmpeg, Advice please... I've looked at your above website, and downloaded the latest 'FFmpeg SVN' (ie: libdvdnav-4.1.3 and libdvdread-4.1.3) from: http://www.mplayerhq.hu/design7/news.html And I've looked over the files in that download, but not sure how to proceed? Eventually, I'm planning on uploading this to my commercial server space that I currently rent. But first, Id like to check it out on my development server that I've set-up on my PC, ie: I have apache + PHP + MySQL set-up as a server on my PC (Windows XP), which I use to develop websites. This is all new to me, I have some HTML, JS, PHP, MySQL, experience, but rather confused about how to get started with this, here's what I initially want to do... 1: I want to set-up a flash player on my website. 2: that will play the videos that my visitors have uploaded (in popular formats) to the site. 3: So the site needs to automatically take their uploaded video file, and convert it to a streaming FLV file. 4: And then make it available to the visitors, for playing online, in the player. To help do this, I believe that I need to use: ffmpeg... But I'm not sure why, or how I should use it, or how to set it up on my server! I would appreciate any help and advice you could give. Thanking you in anticipation. Mac

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convert mpeg2 to mpeg1
by tv.lists＠gmail.com 26 Sep '08

26 Sep '08

Hi, I have an mpeg2(dvd) file which I need to convert to mpeg1(vcd) help is much appreciated regards Mettavihari. -- Streaming video from http://dharmavahini.tv

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Help with error message
by mikhak01＠onlyinternet.net 26 Sep '08

26 Sep '08

I have many video files that give this error. [mpeg4 @ 0x80690e0]Invalid and inefficient vfw-avi packed B frames detected Does anyone know if they are salvageable ? ##### ffmpeg -i bones-s04e05.avi FFmpeg version SVN-r14752, Copyright (c) 2000-2008 Fabrice Bellard, et al. configuration: --enable-pthreads --enable-shared --enable-gpl --enable-shared --enable-liba52 --enable-libmp3lame --enable-gray libavutil 49. 9. 0 / 49. 9. 0 libavcodec 51.64. 0 / 51.64. 0 libavformat 52.20. 0 / 52.20. 0 libavdevice 52. 1. 0 / 52. 1. 0 built on Aug 14 2008 16:05:05, gcc: 3.4.6 [NULL @ 0x80690e0]Invalid and inefficient vfw-avi packed B frames detected Seems stream 0 codec frame rate differs from container frame rate: 23.98 (65535/2733) -> 23.98 (2997003/125000) Input #0, avi, from 'bones-s04e05.avi': Duration: 00:42:51.57, start: 0.000000, bitrate: 1140 kb/s Stream #0.0: Video: mpeg4, yuv420p, 624x352 [PAR 1:1 DAR 39:22], 23.98 tb(r) Stream #0.1: Audio: mp3, 48000 Hz, stereo, s16, 128 kb/s Must supply at least one output file ####### mediainfo bones-s04e05.avi General #0 Complete name : bones-s04e05.avi Format : AVI Format/Info : Audio Video Interleave Format/Family : RIFF File size : 350 MiB PlayTime : 42mn 51s Bit rate : 1141 Kbps StreamSize : 3.91 MiB Writing application : transcode-0.6.9 Video #0 Codec : XviD Codec/Family : MPEG-4V Codec/Info : XviD project Codec settings, Packet bitst : No PlayTime : 42mn 51s Bit rate : 968 Kbps Width : 624 pixels Height : 352 pixels Display Aspect ratio : 16/9 Frame rate : 23.976 fps Resolution : 24 bits StreamSize : 304 MiB Audio #0 Codec : MPEG-1/2 L3 Codec/Family : MPEG-1 Codec/Info : MPEG-1 or 2 layer 3 PlayTime : 42mn 51s Bit rate : 128 Kbps Channel(s) : 2 channels Sampling rate : 48 KHz Resolution : 16 bits StreamSize : 41.6 MiB ##### midentify bones-s04e05.avi ID_VIDEO_ID=0 ID_AUDIO_ID=1 ID_CLIP_INFO_NAME0=Software ID_CLIP_INFO_VALUE0=transcode-0.6.9 ID_CLIP_INFO_N=1 ID_FILENAME=bones-s04e05.avi ID_DEMUXER=avi ID_VIDEO_FORMAT=XVID ID_VIDEO_BITRATE=992392 ID_VIDEO_WIDTH=624 ID_VIDEO_HEIGHT=352 ID_VIDEO_FPS=23.976 ID_VIDEO_ASPECT=0.0000 ID_AUDIO_FORMAT=85 ID_AUDIO_BITRATE=135776 ID_AUDIO_RATE=0 ID_AUDIO_NCH=0 ID_LENGTH=2571.57 ID_VIDEO_CODEC=ffodivx ID_AUDIO_BITRATE=128000 ID_AUDIO_RATE=48000 ID_AUDIO_NCH=2 ID_AUDIO_CODEC=mp3

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deckLink card
by jshupert＠pps-inc.com 25 Sep '08

25 Sep '08

I was wondering if anyone has used a decklink blackmagic card , on Linux or windows with any success. and or - what hardware capture cards might folks endorse as successful with ffmpeg. I wish to capture sdi vide , with iether embbeded audio or seperate aes audio. Thanks

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Low bandwidth encoding - improviing quality - strictly limiting bandwidth.
by P.j.Campbell＠kainos.com 25 Sep '08

25 Sep '08

Hi Folks, I am coming back around to trying to refine out ffmpeg parameters for mobile video calls. Our end user device is a 3G video phone mobile. However the telephony server accepts AVI's with PCM audio and H263 video. The PCM audio will be transcoded to AMR via the SIP->TDM gateway and sent I assume as a 3GPP data stream. So our target is: AVI + H263 @ 176x144 @ NO MORE than 50kbit/s + PCM @ 8000Hz Currently we are using parameters like (justifications in brackets) -f avi -b 40k -ac 1 -g 30 (aiming for rougly 1 IFrame every 2 seconds) -r 15 -ps 400 (can't explain this one, but higher or lower values simply don't work very well) -qscale 10 (We use this as our primary quality<->bitrate trade off value) -vcodec h263 -s qcif -acodec pcm_mulaw -ar 8000 This 'works' okay, but it's not great. At the moment we are lucky that our SIP->TDM gateway buffers any bit rate overrun causing slight lag only. Other gateways we have used are not so forgiving. We have played with the bitrate tolerance, but could not get working results. What I would like to achieve is progressiveness in the quality. Best to use an example.... Take an image that is fairly complex and has fairly small text. I believe it should be possible to sequence this into an h263 video stream and while the initial IFrame may not be able to provide much quality, the subsequent B/P? frames should be able to improve upon it. In other words if the image is static in the video can the bandwidth not be used to increase the definition.... sort of similar to a progressive JPEG. Is this possible with H263? Can anyone suggest different parameters to better utilise the 50kbit available for video? Thanks for any advice, Paul?Campbell? -------------------------------------------------------------------- This e-mail is intended solely for the addressee and is strictly confidential; if you are not the addressee please destroy the message and all copies. Any opinion or information contained in this email or its attachments that does not relate to the business of Kainos is personal to the sender and is not given by or endorsed by Kainos. Kainos is the trading name of Kainos Software Limited, registered in Northern Ireland under company number: NI19370, having its registered offices at: Kainos House, 4-6 Upper Crescent, Belfast, BT7 1NT, Northern Ireland. Registered in the UK for VAT under number: 454598802 and registered in Ireland for VAT under number: 9950340E. This email has been scanned for all known viruses by MessageLabs but is not guaranteed to be virus free; further terms and conditions may be found on our website - www.kainos.com

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help qscale overrides bitrate
by bhattacharya.manas＠gmail.com 25 Sep '08

25 Sep '08

Hi all Can any one clarify me on why the qscale option overrides the bitrate i give form the command line and it calculates its own bitrate ? Basically is it some minimum quality it is trying to achieve and there by taking huge bitrate ? Manas

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Performance encoding direct from udp port
by redtux1＠googlemail.com 25 Sep '08

25 Sep '08

Hi I am trying to transcode on the fly direct from a udp port (using dvbstreamer to send a ps stream from dvb-t card) If I use named pipes and set dvbstreamer to ouput to that "file" performance is Ok using a cmd line like ffmpeg -i <pipefile> -f avi file.avi however if I try to send to a udp port and capture from there I get tons of mb errors ie: ffmpeg -i udp://localhost?localport=1234 -f avi port.avi Am I missing something any tips appreciated thanks

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demultiplex mp4 and remultiplex to FLV
by emanuele.fumagalli＠babelgum.com 25 Sep '08

25 Sep '08

Hi, I'd need to reconvert a video (mpeg-4 container, h264 video, aac audio) into a FLV container. Is it possible to do with one ffmpeg line only, or I need to demultiplex first? Thanks in advance Bye

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Using FFMPEG APIs to encode data using libx264
by dhruvats＠tataelxsi.co.in 25 Sep '08

25 Sep '08

Hi, Can anyone inform about how to make use of FFMPEG APIs with x264 library. I have integrated the x264 library with FFMPEG, and could successfully find the encoder through avcodec_find_encoder. But after i give input to avcodec_encode_video(), the rtp_callback function(registered through AVCODECCONTEXT structure) is not being called. Hence forth I dont get the output data.. Can anyone please tell me what is that i might be missing..Is it because my configuration options are not proper.. Thanks and Regards, Dhruva The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments contained in it.

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question about downmixing
by skreien＠wcnet.org 25 Sep '08

25 Sep '08

I know in past versions I could not use ffmpeg to downmix to stereo. It says can't resample with more than two channels. My question is, is this going to be implemented, or is it already implemented? I tried searching the list, faq, etc, and found lots of posts discussing it, but could not find anything about whether or not it is being planned, worked on, already implemented, etc? Please reply to me via email as I have not subscribed to the list. So far I haven't needed to. Thanks in advance for any info you can send my way! -- Thanks! Scot Kreienkamp

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