“UbuntuHelp:AndroidVideoEncoding”的版本间的差异
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{{From|https://help.ubuntu.com/community/AndroidVideoEncoding}} | {{From|https://help.ubuntu.com/community/AndroidVideoEncoding}} | ||
{{Languages|UbuntuHelp:AndroidVideoEncoding}} | {{Languages|UbuntuHelp:AndroidVideoEncoding}} | ||
− | + | == Encoding Video for the Android Phone, for example, HTC/Google G1 == | |
− | == Encoding Video for the Android Phone, for example, G1 == | + | HTC/Google G1 phone can decode mpeg4, h263 and h264 codecs and can play mp4 and 3gp video formats. Since these format combinations are relatively uncommon, here are instructions to convert your videos to the compatible format. |
− | Google G1 phone can decode mpeg4, h263 and h264 codecs and can play mp4 and 3gp video formats. Since these format combinations are relatively uncommon, here are instructions to convert your videos to the compatible format. | + | If your source is a DVD, skip to [[UbuntuHelp:[Using HandBrake (GUI)|HandBrake section]]] |
− | === | + | == Using Avidemux (GUI) == |
− | ==== | + | === Supported operations === |
+ | {|border="1" cellspacing="0" | ||
+ | |Source||Support Matrix||Workaround | ||
+ | |- | ||
+ | |Individual file||SUPPORTED|| | ||
+ | |- | ||
+ | |DVD||NOT SUPPORTED||[[UbuntuHelp:DVD::Rip|DVD::Rip]] | ||
+ | |} | ||
+ | === Instructions === | ||
+ | This method has been tested in Ubuntu 9.04, adapted from [http://www.android-unleashed.com/2008/11/howto-encode-video-for-android-g1-with.html this article]. It will produce a movie encoded with mpeg4 codec, fast but not optimal. | ||
+ | <ol><li>Install the avidemux package from the Ubuntu multiverse repository | ||
+ | </li><li>Configure video options: | ||
+ | <ol><li>Click on the video dropdown on the left and select MPEG-4 ASP (lavc) | ||
+ | </li><li>Click Configure->Encoding Mode->Single Pass - Bitrate | ||
+ | </li><li>Enter in any bitrate up to 512 to be safe, then click Ok. | ||
+ | </li><li>Click Filters->[[UbuntuHelp:MPlayer|MPlayer]] Resize->Double Click on it-> Width:432, Height:320 if source video is standard resolution. | ||
+ | <ol><li>For widescreen source, choose Width:480, Height:272. | ||
+ | </li><li>Click Ok, then close. | ||
+ | </li></ol></li></ol></li><li>Configure audio options: | ||
+ | <ol><li>Click Audio->AAC (FAAC) | ||
+ | </li><li>Configure->Bitrate 96 | ||
+ | </li><li>Click Format->MP4 | ||
+ | </li></ol></li><li>Click Save and specify a name.mp4 for your video, encoding will start | ||
+ | </li><li>Once enconding has completed, plug in your phone via USB and transfer the video to it, anywhere. The videos can be opened directly using a file manager such as Astro.</li></ol> | ||
+ | |||
+ | == Using WinFF (GUI) == | ||
+ | {{http://winff.org/images/screenshots/winff044-ubuntu-small.jpg}} | ||
+ | === Supported operations === | ||
+ | {|border="1" cellspacing="0" | ||
+ | |Source||Support Matrix||Workaround | ||
+ | |- | ||
+ | |Individual file||SUPPORTED|| | ||
+ | |- | ||
+ | |DVD||NOT SUPPORTED||[[UbuntuHelp:DVD::Rip|DVD::Rip]] | ||
+ | |} | ||
+ | This method will achieve '''superior compression''' using newer codec and higher level of control. | ||
+ | Install WinFF using the following instructions [http://ubuntuforums.org/showthread.php?t=766683 (Reposted -- Updated instructions may be available)] | ||
+ | === Installation === | ||
+ | Copy and paste the following command into the terminal to add the new WinFF repository (EXAMPLE FOR INTREPID, SUBSTITUTE WITH YOUR VERSION): | ||
+ | <pre><nowiki> | ||
+ | echo "deb http://winff.org/ubuntu intrepid universe" | sudo tee /etc/apt/sources.list.d/winff.list | ||
+ | </nowiki></pre> | ||
+ | This second command will merely install something called a GPG Key, so will not need editing by anyone: | ||
+ | <pre><nowiki> | ||
+ | wget --quiet --output-document=- "http://winff.org/ubuntu/AAFE086A.gpg" | sudo apt-key add - && sudo apt-get update | ||
+ | </nowiki></pre> | ||
+ | Finally, execute the command below to install the applications needed for video conversion and editing: | ||
+ | <pre><nowiki> | ||
+ | sudo apt-get install avidemux ffmpeg winff | ||
+ | </nowiki></pre> | ||
+ | === G1-specific Video Conversion Instructions === | ||
+ | * Click on Options and verify that Additional Options are selected -- they will show up on the bottom of the screen | ||
+ | * Click on Add and select one or multiple movies that you want to convert. | ||
+ | * Select Convert to: Ipod | ||
+ | * Select Device Presets: H.264 for Ipod *Linux* (4:3) for standard resolution or H.264 for Ipod *Linux* (16:9) for wide resolution | ||
+ | * In the Additional Options below, choose Video Settings and type Video Size: 432 x 320 for standard resolution and 480 x 272 for wide resolution | ||
+ | * In Audio Settings: If you are planning to listen primarily with headphones, do nothing. If you are planning to listen on the speakerphone, select Audio Channels: 1 to create mono sound. | ||
+ | * Click on Convert toolbar icon. | ||
+ | == Using HandBrake (GUI) == | ||
+ | [http://trac.handbrake.fr/wiki/LinGuiScreenshots {{http://trac.handbrake.fr/raw-attachment/wiki/LinGuiScreenshots/HandBrake-Pic.jpeg}}] | ||
+ | === Supported operations === | ||
+ | {|border="1" cellspacing="0" | ||
+ | |Source||Support Matrix | ||
+ | |- | ||
+ | |Individual file||SUPPORTED | ||
+ | |- | ||
+ | |DVD||SUPPORTED | ||
+ | |} | ||
+ | === Installation === | ||
+ | Summary of instructions from [https://launchpad.net/~handbrake-ubuntu/+archive/ppa]. Copy and paste the following command into the terminal to add the new WinFF repository (EXAMPLE FOR JAUNTY, SUBSTITUTE WITH YOUR VERSION): | ||
+ | <pre><nowiki> | ||
+ | sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com A58BCAE3 | ||
+ | echo "deb http://ppa.launchpad.net/handbrake-ubuntu/ppa/ubuntu jaunty main" | sudo tee /etc/apt/sources.list.d/handbrake.list | ||
+ | sudo apt-get update && sudo apt-get install handbrake-gtk | ||
+ | </nowiki></pre> | ||
+ | === G1-specific Video Conversion Instructions === | ||
+ | <ol><li>When encoding a DVD, select File, "/dev/dvd". Name might be different. | ||
+ | </li><li>When encoding a file, click on Source and select a desired source file. | ||
+ | </li><li>Click on Preset: Apple -> iPhone & iPod Touch | ||
+ | </li><li>Click on Video tab. In Quality, reduce quality to 49 and uncheck Constant Rate Factor | ||
+ | </li><li>Click on Start. | ||
+ | </li><li>Once encoding has completed, plug in your phone via USB and transfer the video to it, anywhere. The videos can be opened directly using a file manager such as Astro.</li></ol> | ||
+ | |||
+ | == Expert mode: Using ffmpeg (command line) == | ||
+ | === Supported operations === | ||
+ | {|border="1" cellspacing="0" | ||
+ | |Source||Support Matrix | ||
+ | |- | ||
+ | |Individual file||SUPPORTED | ||
+ | |- | ||
+ | |DVD||NOT SUPPORTED | ||
+ | |} | ||
+ | === Introduction === | ||
+ | This method will give you the greatest control of the resulting output. | ||
For most versions of Ubuntu, ffmpeg in Medibuntu contains this "unlocked" ffmpeg. Enable Medibuntu with the [[UbuntuHelp:Medibuntu|instructions here]]. | For most versions of Ubuntu, ffmpeg in Medibuntu contains this "unlocked" ffmpeg. Enable Medibuntu with the [[UbuntuHelp:Medibuntu|instructions here]]. | ||
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=== MPEG4 (standard) encoding === | === MPEG4 (standard) encoding === | ||
The default encoding of the videos is MPEG-4 ASP (i.e. "xvid") format video using ffmpeg's mpeg4 encoder. If you are interested in higher quality encodings, which will take quite a bit more time but may result in better quality, see H.264 section below. | The default encoding of the videos is MPEG-4 ASP (i.e. "xvid") format video using ffmpeg's mpeg4 encoder. If you are interested in higher quality encodings, which will take quite a bit more time but may result in better quality, see H.264 section below. | ||
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</nowiki></pre> | </nowiki></pre> | ||
This is VERY basic. For full options, go to [http://ffmpeg.mplayerhq.hu/ffmpeg-doc.html#SEC6 FFmpeg Documentation] | This is VERY basic. For full options, go to [http://ffmpeg.mplayerhq.hu/ffmpeg-doc.html#SEC6 FFmpeg Documentation] | ||
− | * -s is "size" of output video | + | * -s is "size" of output video. |
* -vcodec Choices for G1 are mpeg4 and h263. IMHO I get better quality and marginally smaller file size with mpeg4. | * -vcodec Choices for G1 are mpeg4 and h263. IMHO I get better quality and marginally smaller file size with mpeg4. | ||
* -acodec aac is the audio codec. I know of no other choice here for this purpose. | * -acodec aac is the audio codec. I know of no other choice here for this purpose. | ||
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* -ab 32000 bitrate of the audio -- 32 kbps in this case. Normally I'd balk at such low numbers, but remember, I'm trying to keep filesize low. I'm not broadcasting to a large audience with this, am I? No, it's for me. For you? Use your best judgement. Experiment a little. | * -ab 32000 bitrate of the audio -- 32 kbps in this case. Normally I'd balk at such low numbers, but remember, I'm trying to keep filesize low. I'm not broadcasting to a large audience with this, am I? No, it's for me. For you? Use your best judgement. Experiment a little. | ||
* -aspect 3:2 Obviously, this is the aspect ratio of the output file. I'm not sure it matters, when the output size is being set before. | * -aspect 3:2 Obviously, this is the aspect ratio of the output file. I'm not sure it matters, when the output size is being set before. | ||
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While ffmpeg is running, you should see the following: | While ffmpeg is running, you should see the following: | ||
<pre><nowiki> | <pre><nowiki> | ||
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Stream #0.1: Audio: aac, 16000 Hz, mono, s16, 32 kb/s | Stream #0.1: Audio: aac, 16000 Hz, mono, s16, 32 kb/s | ||
</nowiki></pre> | </nowiki></pre> | ||
− | + | Very old versions of Android Video Player incorrectly scaled video, that is, if the video size was anything but 480 by 320, you would see stretching in the playback on the G1. It is no longer a problem. | |
=== H.264 Encoding === | === H.264 Encoding === | ||
[http://en.wikipedia.org/wiki/H.264 H.264 (MPEG-4 AVC)] is a newer codec that the G1 supports. It's able to deliver similar quality at half the bitrate of MPEG-4 ASP! However, it is an extremely slow and CPU-intensive encoder. Expect the encode to take 5x longer than mpeg4 or xvid. You also need ffmpeg with x264 support. | [http://en.wikipedia.org/wiki/H.264 H.264 (MPEG-4 AVC)] is a newer codec that the G1 supports. It's able to deliver similar quality at half the bitrate of MPEG-4 ASP! However, it is an extremely slow and CPU-intensive encoder. Expect the encode to take 5x longer than mpeg4 or xvid. You also need ffmpeg with x264 support. | ||
− | Due to the G1's limited feature support for H.264, the command for doing the encode is that much more complex. If you are interested in technical details, G1 supports only the [http://en.wikipedia.org/wiki/H.264#Profiles | + | Due to the G1's limited feature support for H.264, the command for doing the encode is that much more complex. If you are interested in technical details, G1 supports only the [http://en.wikipedia.org/wiki/H.264#Profiles Constrained Baseline Profile (CBP) dialect of H.264]; videos that use more advanced features of H.264 play incorrectly, or not at all. In case of incorrect video encoding, the most typical error is a black screen during playback on G1 while the audio plays. |
− | Note that since we | + | Note that since we are striving for better quality, the audio encoding is also set to higher standards. Assuming source movie has aspect ratio 4:3, the command is: |
<pre><nowiki> | <pre><nowiki> | ||
− | ffmpeg -i source-video.avi -s | + | ffmpeg -i source-video.avi -s 432x320 -b 384k -vcodec h264 -flags +loop+mv4 -cmp 256 -partitions +parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 -subq 7 -trellis 1 -refs 5 -bf 0 -flags2 +mixed_refs -coder 0 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -qmin 10 -qmax 51 -qdiff 4 -acodec aac output-video.G1.mp4 |
</nowiki></pre> | </nowiki></pre> | ||
− | For example of a typical American camcoder which records at 640x480 resolution with 30 frames per second rate, we will | + | Some versions of ffmpeg use older syntax, that is, -vcodec libx264 and -acodec libfaac. |
+ | For example of a typical American camcoder which records at 640x480 resolution with 30 frames per second rate, we will resize image and change the rate (-r 15): | ||
<pre><nowiki> | <pre><nowiki> | ||
− | ffmpeg -i myparty.avi -s | + | ffmpeg -i myparty.avi -s 432x320 -b 384k -vcodec h264 -flags +loop+mv4 -cmp 256 -partitions +parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 -subq 7 -trellis 1 -refs 5 -bf 0 -flags2 +mixed_refs -coder 0 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -qmin 10 -qmax 51 -qdiff 4 -acodec aac -r 15 myparty.G1.mp4 |
</nowiki></pre> | </nowiki></pre> | ||
While ffmpeg is running, you should see the following: | While ffmpeg is running, you should see the following: | ||
<pre><nowiki> | <pre><nowiki> | ||
Output #0, mp4, to 'myparty.G1.mp4': | Output #0, mp4, to 'myparty.G1.mp4': | ||
− | Stream #0.0: Video: h264, yuv420p, | + | Stream #0.0: Video: h264, yuv420p, 432x320, q=10-51, 384 kb/s, 15.00 fps(c) |
Stream #0.1: Audio: aac, 44100 Hz, stereo, 64 kb/s | Stream #0.1: Audio: aac, 44100 Hz, stereo, 64 kb/s | ||
</nowiki></pre> | </nowiki></pre> | ||
− | + | == Expert mode: Using mencoder (command line) == | |
− | === | + | === Supported operations === |
− | + | {|border="1" cellspacing="0" | |
− | === | + | |Source||Support Matrix |
− | + | |- | |
− | + | |Individual file||SUPPORTED | |
+ | |- | ||
+ | |DVD||SUPPORTED | ||
+ | |} | ||
+ | === Introduction === | ||
+ | These instructions are only applicable to encoding DVD tracks into G1 compatible video format. This is not a preferred method due to its complexity. Please read a chapter about H.264 above in the FFmpeg description. | ||
+ | === Installation === | ||
+ | Upgrade to the latest version of software using the following PPA repositories: [https://launchpad.net/~rvm/+archive/mplayer |MPlayer and MEncoder] and [https://launchpad.net/~rvm/+archive/smplayer |SMPlayer (Optional) a very handy GUI front-end for MPlayer]. | ||
+ | Additionally, install gpac package from universe repository. | ||
+ | === Conversion === | ||
+ | The following command a track number 10 into an AVI file. As mentioned previously, the source has aspect ratio of 4:3, so we choose 432x320 as output most appropriate for G1 screen. | ||
<pre><nowiki> | <pre><nowiki> | ||
− | + | mencoder dvd://10 -dvd-device /dev/dvd -aid 128 -o output.avi -ovc x264 -x264encopts bitrate=640:nocabac:direct_pred=auto:me=umh:frameref=2:level_idc=21:partitions=all:subq=6:threads=auto:trellis=1:vbv_maxrate=768:vbv_bufsize=244:bframes=0 -oac faac -faacopts br=96:mpeg=4:object=2 -channels 1 -srate 48000 -vf scale=432:320,harddup | |
</nowiki></pre> | </nowiki></pre> | ||
− | + | '''Warning''': Currently, mencoder is not able to produce MP4 containers usably by mobiles players. Do not use the following mencoder option: -of lavf -lavfopts format=mp4. | |
+ | After that, convert AVI to MP4 containers using [http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-quicktime-7.html these instructions]. | ||
+ | Alternatively, use MP4Box utility from gpac package which strictly complies to MPEG4 standard. | ||
<pre><nowiki> | <pre><nowiki> | ||
− | + | MP4Box -aviraw video output.avi | |
+ | MP4Box -aviraw audio output.avi | ||
+ | mv output_audio.raw output_audio.aac | ||
+ | MP4Box -add output_video.h264 -add output_audio.aac output.mp4 | ||
+ | rm output.avi | ||
</nowiki></pre> | </nowiki></pre> | ||
− | + | Plug-in your phone via USB and copy output.mp4 to your Android mobile device. | |
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== Get help == | == Get help == | ||
As always, Ubuntuforums is a great place to ask for help. Please use the [http://ubuntuforums.org/forumdisplay.php?f=335 Multimedia Production] category. | As always, Ubuntuforums is a great place to ask for help. Please use the [http://ubuntuforums.org/forumdisplay.php?f=335 Multimedia Production] category. |
2009年11月17日 (二) 18:30的版本
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目录
Encoding Video for the Android Phone, for example, HTC/Google G1
HTC/Google G1 phone can decode mpeg4, h263 and h264 codecs and can play mp4 and 3gp video formats. Since these format combinations are relatively uncommon, here are instructions to convert your videos to the compatible format. If your source is a DVD, skip to [[UbuntuHelp:[Using HandBrake (GUI)|HandBrake section]]]
Using Avidemux (GUI)
Supported operations
Source | Support Matrix | Workaround |
Individual file | SUPPORTED | |
DVD | NOT SUPPORTED | DVD::Rip |
Instructions
This method has been tested in Ubuntu 9.04, adapted from this article. It will produce a movie encoded with mpeg4 codec, fast but not optimal.
- Install the avidemux package from the Ubuntu multiverse repository
- Configure video options:
- Click on the video dropdown on the left and select MPEG-4 ASP (lavc)
- Click Configure->Encoding Mode->Single Pass - Bitrate
- Enter in any bitrate up to 512 to be safe, then click Ok.
- Click Filters->MPlayer Resize->Double Click on it-> Width:432, Height:320 if source video is standard resolution.
- For widescreen source, choose Width:480, Height:272.
- Click Ok, then close.
- Configure audio options:
- Click Audio->AAC (FAAC)
- Configure->Bitrate 96
- Click Format->MP4
- Click Save and specify a name.mp4 for your video, encoding will start
- Once enconding has completed, plug in your phone via USB and transfer the video to it, anywhere. The videos can be opened directly using a file manager such as Astro.
Using WinFF (GUI)
模板:Http://winff.org/images/screenshots/winff044-ubuntu-small.jpg
Supported operations
Source | Support Matrix | Workaround |
Individual file | SUPPORTED | |
DVD | NOT SUPPORTED | DVD::Rip |
This method will achieve superior compression using newer codec and higher level of control. Install WinFF using the following instructions (Reposted -- Updated instructions may be available)
Installation
Copy and paste the following command into the terminal to add the new WinFF repository (EXAMPLE FOR INTREPID, SUBSTITUTE WITH YOUR VERSION):
echo "deb http://winff.org/ubuntu intrepid universe" | sudo tee /etc/apt/sources.list.d/winff.list
This second command will merely install something called a GPG Key, so will not need editing by anyone:
wget --quiet --output-document=- "http://winff.org/ubuntu/AAFE086A.gpg" | sudo apt-key add - && sudo apt-get update
Finally, execute the command below to install the applications needed for video conversion and editing:
sudo apt-get install avidemux ffmpeg winff
G1-specific Video Conversion Instructions
- Click on Options and verify that Additional Options are selected -- they will show up on the bottom of the screen
- Click on Add and select one or multiple movies that you want to convert.
- Select Convert to: Ipod
- Select Device Presets: H.264 for Ipod *Linux* (4:3) for standard resolution or H.264 for Ipod *Linux* (16:9) for wide resolution
- In the Additional Options below, choose Video Settings and type Video Size: 432 x 320 for standard resolution and 480 x 272 for wide resolution
- In Audio Settings: If you are planning to listen primarily with headphones, do nothing. If you are planning to listen on the speakerphone, select Audio Channels: 1 to create mono sound.
- Click on Convert toolbar icon.
Using HandBrake (GUI)
模板:Http://trac.handbrake.fr/raw-attachment/wiki/LinGuiScreenshots/HandBrake-Pic.jpeg
Supported operations
Source | Support Matrix |
Individual file | SUPPORTED |
DVD | SUPPORTED |
Installation
Summary of instructions from [1]. Copy and paste the following command into the terminal to add the new WinFF repository (EXAMPLE FOR JAUNTY, SUBSTITUTE WITH YOUR VERSION):
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com A58BCAE3 echo "deb http://ppa.launchpad.net/handbrake-ubuntu/ppa/ubuntu jaunty main" | sudo tee /etc/apt/sources.list.d/handbrake.list sudo apt-get update && sudo apt-get install handbrake-gtk
G1-specific Video Conversion Instructions
- When encoding a DVD, select File, "/dev/dvd". Name might be different.
- When encoding a file, click on Source and select a desired source file.
- Click on Preset: Apple -> iPhone & iPod Touch
- Click on Video tab. In Quality, reduce quality to 49 and uncheck Constant Rate Factor
- Click on Start.
- Once encoding has completed, plug in your phone via USB and transfer the video to it, anywhere. The videos can be opened directly using a file manager such as Astro.
Expert mode: Using ffmpeg (command line)
Supported operations
Source | Support Matrix |
Individual file | SUPPORTED |
DVD | NOT SUPPORTED |
Introduction
This method will give you the greatest control of the resulting output. For most versions of Ubuntu, ffmpeg in Medibuntu contains this "unlocked" ffmpeg. Enable Medibuntu with the instructions here.
MPEG4 (standard) encoding
The default encoding of the videos is MPEG-4 ASP (i.e. "xvid") format video using ffmpeg's mpeg4 encoder. If you are interested in higher quality encodings, which will take quite a bit more time but may result in better quality, see H.264 section below. To convert a file source-video.avi to a desired G1 format, run the following command:
ffmpeg -i source-video.avi -s 480x320 -vcodec mpeg4 -acodec aac -ac 1 -ar 16000 -r 13 -ab 32000 -aspect 3:2 output-video.G1.mp4
This is VERY basic. For full options, go to FFmpeg Documentation
- -s is "size" of output video.
- -vcodec Choices for G1 are mpeg4 and h263. IMHO I get better quality and marginally smaller file size with mpeg4.
- -acodec aac is the audio codec. I know of no other choice here for this purpose.
- Older versions of ffmpeg called this option -acodec libfaac.
- -ac 1 Number of audio channels. Use 1 to save filesize since you only have one speaker. Unless you like wearing those painful earbuds all the time. Then use -ac 2.
- -ar 16000 Audio sampling rate in Hertz. Some formats won't work with anything other than 8kHz. 16 kHz seems okay to me, considering what I'm watching it on. Don't expect !HiFi from a phone.
- -r 13 Frames per second. Larger is smoother, but 30 fps requires double the file size of 15 fps. 12 is about the slowest my eyes can comfortably watch. Since DVDs are right at 25 FPS, 12.5 being half of this, I go with 13. My camera makes 30 FPS; in that case, use -r 15.
- -ab 32000 bitrate of the audio -- 32 kbps in this case. Normally I'd balk at such low numbers, but remember, I'm trying to keep filesize low. I'm not broadcasting to a large audience with this, am I? No, it's for me. For you? Use your best judgement. Experiment a little.
- -aspect 3:2 Obviously, this is the aspect ratio of the output file. I'm not sure it matters, when the output size is being set before.
While ffmpeg is running, you should see the following:
Output #0, mp4, to 'terminal.G1.mp4': Stream #0.0: Video: mpeg4, yuv420p, 480x320 [PAR 1:1 DAR 3:2], q=2-31, 200 kb/s, 13.00 tb(c) Stream #0.1: Audio: aac, 16000 Hz, mono, s16, 32 kb/s
Very old versions of Android Video Player incorrectly scaled video, that is, if the video size was anything but 480 by 320, you would see stretching in the playback on the G1. It is no longer a problem.
H.264 Encoding
H.264 (MPEG-4 AVC) is a newer codec that the G1 supports. It's able to deliver similar quality at half the bitrate of MPEG-4 ASP! However, it is an extremely slow and CPU-intensive encoder. Expect the encode to take 5x longer than mpeg4 or xvid. You also need ffmpeg with x264 support. Due to the G1's limited feature support for H.264, the command for doing the encode is that much more complex. If you are interested in technical details, G1 supports only the Constrained Baseline Profile (CBP) dialect of H.264; videos that use more advanced features of H.264 play incorrectly, or not at all. In case of incorrect video encoding, the most typical error is a black screen during playback on G1 while the audio plays. Note that since we are striving for better quality, the audio encoding is also set to higher standards. Assuming source movie has aspect ratio 4:3, the command is:
ffmpeg -i source-video.avi -s 432x320 -b 384k -vcodec h264 -flags +loop+mv4 -cmp 256 -partitions +parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 -subq 7 -trellis 1 -refs 5 -bf 0 -flags2 +mixed_refs -coder 0 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -qmin 10 -qmax 51 -qdiff 4 -acodec aac output-video.G1.mp4
Some versions of ffmpeg use older syntax, that is, -vcodec libx264 and -acodec libfaac. For example of a typical American camcoder which records at 640x480 resolution with 30 frames per second rate, we will resize image and change the rate (-r 15):
ffmpeg -i myparty.avi -s 432x320 -b 384k -vcodec h264 -flags +loop+mv4 -cmp 256 -partitions +parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 -subq 7 -trellis 1 -refs 5 -bf 0 -flags2 +mixed_refs -coder 0 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -qmin 10 -qmax 51 -qdiff 4 -acodec aac -r 15 myparty.G1.mp4
While ffmpeg is running, you should see the following:
Output #0, mp4, to 'myparty.G1.mp4': Stream #0.0: Video: h264, yuv420p, 432x320, q=10-51, 384 kb/s, 15.00 fps(c) Stream #0.1: Audio: aac, 44100 Hz, stereo, 64 kb/s
Expert mode: Using mencoder (command line)
Supported operations
Source | Support Matrix |
Individual file | SUPPORTED |
DVD | SUPPORTED |
Introduction
These instructions are only applicable to encoding DVD tracks into G1 compatible video format. This is not a preferred method due to its complexity. Please read a chapter about H.264 above in the FFmpeg description.
Installation
Upgrade to the latest version of software using the following PPA repositories: |MPlayer and MEncoder and |SMPlayer (Optional) a very handy GUI front-end for MPlayer. Additionally, install gpac package from universe repository.
Conversion
The following command a track number 10 into an AVI file. As mentioned previously, the source has aspect ratio of 4:3, so we choose 432x320 as output most appropriate for G1 screen.
mencoder dvd://10 -dvd-device /dev/dvd -aid 128 -o output.avi -ovc x264 -x264encopts bitrate=640:nocabac:direct_pred=auto:me=umh:frameref=2:level_idc=21:partitions=all:subq=6:threads=auto:trellis=1:vbv_maxrate=768:vbv_bufsize=244:bframes=0 -oac faac -faacopts br=96:mpeg=4:object=2 -channels 1 -srate 48000 -vf scale=432:320,harddup
Warning: Currently, mencoder is not able to produce MP4 containers usably by mobiles players. Do not use the following mencoder option: -of lavf -lavfopts format=mp4. After that, convert AVI to MP4 containers using these instructions. Alternatively, use MP4Box utility from gpac package which strictly complies to MPEG4 standard.
MP4Box -aviraw video output.avi MP4Box -aviraw audio output.avi mv output_audio.raw output_audio.aac MP4Box -add output_video.h264 -add output_audio.aac output.mp4 rm output.avi
Plug-in your phone via USB and copy output.mp4 to your Android mobile device.
Get help
As always, Ubuntuforums is a great place to ask for help. Please use the Multimedia Production category.
Primary source
- http://androidcommunity.com/forums/showthread.php?p=88879#post88879 - Initial post that details the procedure.
- http://h264.code-shop.com/trac/wiki/Encoding - Settings for H.264 codec.
Inspired by
Additional information
- FFmpeg documentation
- Unlocking Some Secrets of the Android G1 Video Capabilities
- Encoding videos for G1
- Extensive discussion of sizing videos for G1. Excel spreadsheet for calculations is attached.