February 2013 - ffmpeg-user - lists.ffmpeg.org

feature request: able to link against libjpeg
by Roger Pack 14 Nov '13

14 Nov '13

Hello. I suppose that ffmpeg has its own "internal" jpeg library for decoding/encoding jpeg's. My assumption is also that it is "unoptimized" (at least compared to similar libraries, like libjpeg-turbo). My wish/goal would be to have the speed of libjpeg-turbo. Maybe a configure option to use libjpeg instead of the internal stuff? Thoughts? Thanks. -r

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Audio sync issues when transcoding Hauppauge HDPVR content
by Scott Naef 27 Oct '13

27 Oct '13

I am attempting to transcode recordings made with an HDPVR. I am using Mythtv to do the capture. I originally had trouble with playback in Myth but was able to use the environment variable FORCE_DTS_TIMESTAMPS=1 to get proper playback in Myth. I am an absolute newbie when it comes to the finer details of the workings of these various media packages. I have read several places that the HDPVR produces broken PTS timestamps. However, if there is a workable solution to playback content in Myth, I am hoping there is a workable solution to do transcoding with FFMPEG. I have tried several options in FFMPEG such as -async 1 but nothing I try seems to work. I always end up with about 1.5 second delay in video from audio. From what I understand DTS timestamps are used to decode content and offer a deterministic way to predict the number of frames to decode and PTS timestamps are used to show the correct frames in the correct order. If this is true (long shot!) then I guess I need a way to mux the audio and video streams using DTS not PTS. Is this way the Myth player does it? Version: ffmpeg version git-2013-01-05-7e5d4fa Copyright (c) 2000-2013 the FFmpeg developers built on Jan 5 2013 17:29:28 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5) configuration: --enable-gpl --enable-libass --enable-libfaac --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-x11grab --enable-libx264 --enable-nonfree --enable-version3 libavutil 52. 13.100 / 52. 13.100 libavcodec 54. 85.101 / 54. 85.101 libavformat 54. 59.104 / 54. 59.104 libavdevice 54. 3.102 / 54. 3.102 libavfilter 3. 32.100 / 3. 32.100 libswscale 2. 1.103 / 2. 1.103 libswresample 0. 17.102 / 0. 17.102 libpostproc 52. 2.100 / 52. 2.100 Any help would be greatly appreciated. If needed I can grab a few seconds of a news clip (talking heads help to see this) and offer it up somewhere. Thank you! -Scott Naef

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mmco: unref short failure error and freeze playback of video streams
by Johan 750 25 Oct '13

25 Oct '13

Hi Everbody, I'm using mplayer/ffmpeg to playback 4 h264 streams generated by ip-camera's. The four streams will play just fine for about 70 minutes. Then one of the four streams generates the following message and all four streams stop playing: [h264 @ 0x8a7c520]Missing reference picture [h264 @ 0x8a7c520]decode_slice_header error [h264 @ 0x8a7c520]mmco: unref short failure I'm using mplayer-vaapi (latest greatest from the top of my head 10-2012) with a git checkout of ffmpeg (15-02-2012). Does anybody have any idea what could have gone wrong here? Thanks! Johan

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Remux to a "brand mp42" MP4 file
by Vangelis forthnet 22 Oct '13

22 Oct '13

Hello people :-) , this is my first post on the list, please be patient/lenient, apologies if my following query has been previously answered somewhere inside the vastness of the mail archives... I have an FLV file downloaded by RTMPdump 2.4; video is AVC Main(a)L3.0, audio is HE-AAC / LC (aka HE-AACv1 or aacp or AAC+SBR). I want to use FFmpeg to remux losslessly into the MP4 container, preferably with a one-step-process, but I want the ftyp atom of the mp4 file to be mp42. "mp42" means a "compatible brand" "MP4 v2 [ISO 14496-14]". I am on WindowsVista SP2 x86 & using the static win32 build of FFmpeg 1.1.1 from the Zeranoe repository at http://ffmpeg.zeranoe.com/builds/win32/static/ When I run the remuxing command: ffmpeg -i "foo.flv" -c copy -f mp4 "foo.mp4" the resulting file always has (mediainfo report): Format profile : Base Media Codec ID : isom i.e. ftype code 'isom' (means a "compatible brand" "MP4 Base Media v1 [IS0 14496-12:2003]"). Is there something I could add to the command so that the generated mp4 file reports: Format profile : Base Media / Version 2 Codec ID : mp42 Before posting here, I have searched for about 30min on the web, found nothing conclusive... Right now, the only way to accomplish this is to demux the raw streams from the FLV (either via FLVExtractCL.exe or via FFmpeg.exe, Video: ffmpeg -i foo.flv -f h264 -an -c:v copy -bsf:v h264_mp4toannexb Video.h264 Audio: ffmpeg -i foo.flv -f adts -vn -c:a copy Audio.aac and then remux them to mp4 with MP4Box: MP4Box -brand mp42 -delay 1=1 -add "Video.264:name=AVC Video Stream:lang=en:fps=25.000" -add "Audio.aac:name=HE-AAC Audio Stream:lang=en:sbr:mpeg4" -itags tool="MP4Box-0.4.6-dev-ir5-x86-shared.Kurtnoise.12-Jun-2010" "Remux-mp42.mp4" And while I am at it, is there a way for ffmpeg to flag the aac audio stream as being HE-AAC? When I play back with Quicktime the mp4 FFmpeg creates, Quicktime reports that the audio stream is AAC LC, not HE-AAC (which is the correct type). However, MP4Box does have the switch --sbr, so the mp4 file IT creates is correctly recognised by Quicktime as having a HE-AAC audio stream and the sampling rate is correctly displayed @ 48.0kHz, not at half that value (24.0 kHz), which is the case with the ffmpeg created one... Many thanks in advance!

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How do I make ffplay play without high latency?
by Jesse Gordon 15 Oct '13

15 Oct '13

Good Day, I have an internet-controllable robot (See photo) and I have a little Cisco MP4 streaming video network camera on it, and I'm trying to use ffplay to play the live video stream. The camera encodes the video to either mjpeg or mpeg4 with extremely low latency. I'm using the mpeg4 mode because it requires far less bandwidth. The problem I'm having is that ffplay seems to introduce a second or two of latency -- which is a big deal when you're driving the robot via the video feed, and you can' t see where you're going until after it's too late. With mplayer I was using the -benchmark option which makes it play as fast as possible, but even that has just under a second of latency. I know that the video camera is getting the data out the network port quickly because when I use the windows web client, it has a plugin that streams/plays the mpeg4 and it has very low latency -- so I know the camera is not the source of the latency. (But of course I use Linux.) Is there a way to make ffmpeg play each frame as soon as it can with reduced buffers or whatever so I can get the picture to the screen as soon as possible? I don't care too much about jitter or stuttering - I just need the video on the screen as soon as possible. Thank you very much, ~Jesse NOTE: Below, the "warning: first frame is no keyframe" line happened when I clicked in ffplay to fast forward to the end, to try to get latency to reduce. But the video was playing just fine after I clicked to fast forward. bash-4.1# ffplay http://admin:admin@192.168.0.65/img/video.asf ffplay version N-46939-g030db0c Copyright (c) 2003-2012 the FFmpeg developers built on Nov 21 2012 00:52:42 with gcc 4.5.2 (GCC) configuration: --prefix=/usr libavutil 52. 8.100 / 52. 8.100 libavcodec 54. 74.100 / 54. 74.100 libavformat 54. 37.100 / 54. 37.100 libavdevice 54. 3.100 / 54. 3.100 libavfilter 3. 23.101 / 3. 23.101 libswscale 2. 1.102 / 2. 1.102 libswresample 0. 17.101 / 0. 17.101 [asf @ 0x8f2b1a0] Estimating duration from bitrate, this may be inaccurate Input #0, asf, from 'http://admin:admin@192.168.0.65/img/video.asf': Duration: N/A, start: 0.000000, bitrate: N/A Stream #0:0: Video: mpeg4 (MP4S / 0x5334504D), yuv420p, 640x480, 14.99 tbr, 1k tbn, 1k tbc Frame changed from size:0x0 to size:640x480 4KB sq= 0B f=0/0 [asf @ 0x8f2b1a0] freeing incomplete packet size 972, new 874=0/0 [asf @ 0x8f2b1a0] freeing incomplete packet size 972, new 829=0/0 [asf @ 0x8f2b1a0] freeing incomplete packet size 971, new 823=0/0 [asf @ 0x8f2b1a0] freeing incomplete packet size 975, new 11230/0 [asf @ 0x8f2b1a0] freeing incomplete packet size 974, new 14450/0 [asf @ 0x8f2b1a0] freeing incomplete packet size 974, new 753=0/0 [mpeg4 @ 0x8f40920] warning: first frame is no keyframe 0KB sq= 0B f=0/0 [asf @ 0x8f2b1a0] freeing incomplete packet size 973, new 790=0/0 B f=0/0 [asf @ 0x8f2b1a0] freeing incomplete packet size 975, new 784=0/0 61.58 A-V: 0.000 fd= 517 aq= 0KB vq= 0KB sq= 0B f=0/0 bash-4.1#

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Encoding x264 hangs in a high turn over pipeline
by Luke 06 Oct '13

06 Oct '13

Hello, We are testing ffmpeg in our compression pipeline as our commercial software does not provide the functionality we need. We run a multithreaded compression (ffmpeg multithreading isn't used, our own solution is) using the following command: ffmpeg -i #input# -f mp4 -vcodec libx264 -s 1024x576 -b:v 2000k -g 33 -acodec libmp3lame -b:a 128k -ar 44100 -vf "movie=#logo# [wm]; [in][wm] overlay=10:main_h-overlay_h-10 [out]" -y #output# Approx. 75% threads complete without any problems, the remaining ones get stuck - cpu usage on each thread drops to 0, memory usage gets stuck at around 300MB. Initially we used aac and libvo_aacenc coders for audio, but the hangs seemed more frequent. Tested on a few recent ffmpeg builds, including the one compiled on 20/07. Any help would be greatly appreciated. Many thanks, Luke -- *Luke Niejadlik* Audiomotion Studios Ltd. T: +44 (0)8701 600 504 F: +44 (0)1865 725 651 www.audiomotion.com <http://www.audiomotion.com/> Develop Awards - Best Services Winner 2011, 2009 & 2004 */JOIN THE MOVEMENT!/* - www.facebook.com/audiomotion.studios <http://www.facebook.com/audiomotion.studios> - twitter.com/audiomotion <http://twitter.com/audiomotion> - http://www.join-the-movement.co.uk/

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UDP Multicast streaming
by omar.gomez＠gmail.com 04 Oct '13

04 Oct '13

Hi!, I've been using the FFmpeg + Mplayer combo for a college project I'm working on. The idea is to stream an Opengl app's buffer is real-time in order to have thin-clients interact remotely with the app. I've succeed at building an scenario where the buffer is pulled out of the app and injected to a pipe using the following command: cat <fifo> | ppmtoy4m -S 420jpeg | ffmpeg -y -f yuv4mpegpipe -i - -f avi udp:127.0.0.1:1234 Clients then use the following command to view the stream: mplayer -demuxer mpeg4es udp://@127.0.0.1:5000 This has been working all right, but I want to achieve the following: 1) Work in a multicast scenario. ======================== I though it was as easy as to change the address for a multicasting one like the following: cat <fifo> | ppmtoy4m -S 420jpeg | ffmpeg -y -f yuv4mpegpipe -i - -f avi udp:224.0.0.1:5000?ttl=1 Using the ?ttl parameter was something I found by googling, but I'm not sure if that works. At the same time MPLayer clients should work by using: mplayer -demuxer mpeg4es udp://@224.0.0.1:5000 Which works, but I'm wondering why I *have* to add a port (being a multicast address) and why it doesn't work if I open a second client (I believe is still working as unicast) 2) Using VLC ========== I've not been able to make this work with VLC. That "demuxer" parameter seen to be the problem. 3) Use different containers,codecs ================== This seems to be working using mpeg4+yuv420p. I would like to experiment with other codes as well, like h263p or h262. Have any of you have had one of these problems? I appreciate any help --Omar -- Follow me at: Twitter: http://twitter.com/omargomez Buzz: http://www.google.com/profiles/108165850309051561506#buzz Blog: blog.pixagora.com

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compile error: ffmpeg av_get_default_channel_layout
by Sven Dueking 06 Sep '13

06 Sep '13

Hi all, I am not a linux expert, maybe I made something stupied but I was not able to figure out what´s wrong here. Basically I downloaded ffmpeg 11.0, build it and set the lib and include path in eclipse. But I get this error : relocation error: /usr/local/lib/libavcodec.so.54: symbol av_get_default_channel_layout, version LIBAVUTIL_51 not defined in file libavutil.so.51 with link time reference My guess is, there is a mismatch between older and newer libs from ffmpeg. Can anyone help here ? Not sure if this makes a difference, the same code works under windows. Thanks, Sven

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Extracting MXF Metadata
by hsomob1999＠yahoo.com 02 Sep '13

02 Sep '13

Hello, Is it possible to retrieve MXF metadata with ffmpeg? Is there way to extract metadata from any format? I see that there is a -metadata flag but this only allows one to set metadata. Thanks

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How to the use drawtext.c in my program
by ajaxhe 08 Aug '13

08 Aug '13

Now, I want to add the system datetime information in per video frame, then store as a .mp4 file. I have known drawtext.c can finish this task, but any example to use the APIs in drawtext.c? thanks! -- View this message in context: http://ffmpeg-users.933282.n4.nabble.com/How-to-the-use-drawtext-c-in-my-pr… Sent from the FFmpeg-users mailing list archive at Nabble.com.

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