--recode-video option (Closes #18)

4 files changed, 54 insertions, 43 deletions

diff --git a/youtube_dl/FileDownloader.py b/youtube_dl/FileDownloader.py
index be9e4918e..f0879a675 100644
--- a/youtube_dl/FileDownloader.py
+++ b/youtube_dl/FileDownloader.py
@@ -81,6 +81,7 @@ class FileDownloader(object):
     writesubtitles:    Write the video subtitles to a .srt file
     subtitleslang:     Language of the subtitles to download
     test:              Download only first bytes to test the downloader.
+    keepvideo:         Keep the video file after post-processing
     """
 
     params = None
@@ -529,13 +530,27 @@ class FileDownloader(object):
         return self._download_retcode
 
     def post_process(self, filename, ie_info):
-        """Run the postprocessing chain on the given file."""
+        """Run all the postprocessors on the given file."""
         info = dict(ie_info)
         info['filepath'] = filename
+        keep_video = None
         for pp in self._pps:
-            info = pp.run(info)
-            if info is None:
-                break
+            try:
+                keep_video_wish,new_info = pp.run(info)
+                if keep_video_wish is not None:
+                    if keep_video_wish:
+                        keep_video = keep_video_wish
+                    elif keep_video is None:
+                        # No clear decision yet, let IE decide
+                        keep_video = keep_video_wish
+            except PostProcessingError as e:
+                self.to_stderr(u'ERROR: ' + e.msg)
+        if not keep_video and not self.params.get('keepvideo', False):
+            try:
+                self.to_stderr(u'Deleting original file %s (pass -k to keep)' % filename)
+                os.remove(encodeFilename(filename))
+            except (IOError, OSError):
+                self.to_stderr(u'WARNING: Unable to remove downloaded video file')
 
     def _download_with_rtmpdump(self, filename, url, player_url, page_url):
         self.report_destination(filename)
diff --git a/youtube_dl/PostProcessor.py b/youtube_dl/PostProcessor.py
index 3d1093731..545b6992b 100644
--- a/youtube_dl/PostProcessor.py
+++ b/youtube_dl/PostProcessor.py
@@ -45,25 +45,20 @@ class PostProcessor(object):
         one has an extra field called "filepath" that points to the
         downloaded file.
 
-        When this method returns None, the postprocessing chain is
-        stopped. However, this method may return an information
-        dictionary that will be passed to the next postprocessing
-        object in the chain. It can be the one it received after
-        changing some fields.
+        This method returns a tuple, the first element of which describes
+        whether the original file should be kept (i.e. not deleted - None for
+        no preference), and the second of which is the updated information.
 
         In addition, this method may raise a PostProcessingError
-        exception that will be taken into account by the downloader
-        it was called from.
+        exception if post processing fails.
         """
-        return information # by default, do nothing
+        return None, information # by default, keep file and do nothing
 
-class FFmpegPostProcessorError(BaseException):
-    def __init__(self, message):
-        self.message = message
+class FFmpegPostProcessorError(PostProcessingError):
+    pass
 
-class AudioConversionError(BaseException):
-    def __init__(self, message):
-        self.message = message
+class AudioConversionError(PostProcessingError):
+    pass
 
 class FFmpegPostProcessor(PostProcessor):
     def __init__(self,downloader=None):
@@ -83,7 +78,7 @@ class FFmpegPostProcessor(PostProcessor):
 
     def run_ffmpeg(self, path, out_path, opts):
         if not self._exes['ffmpeg'] and not self._exes['avconv']:
-            raise FFmpegPostProcessorError('ffmpeg or avconv not found. Please install one.')
+            raise FFmpegPostProcessorError(u'ffmpeg or avconv not found. Please install one.')
         cmd = ([self._exes['avconv'] or self._exes['ffmpeg'], '-y', '-i', encodeFilename(path)]
                + opts +
                [encodeFilename(self._ffmpeg_filename_argument(out_path))])
@@ -91,7 +86,7 @@ class FFmpegPostProcessor(PostProcessor):
         stdout,stderr = p.communicate()
         if p.returncode != 0:
             msg = stderr.strip().split('\n')[-1]
-            raise FFmpegPostProcessorError(msg)
+            raise FFmpegPostProcessorError(msg.decode('utf-8', 'replace'))
 
     def _ffmpeg_filename_argument(self, fn):
         # ffmpeg broke --, see https://ffmpeg.org/trac/ffmpeg/ticket/2127 for details
@@ -100,13 +95,12 @@ class FFmpegPostProcessor(PostProcessor):
         return fn
 
 class FFmpegExtractAudioPP(FFmpegPostProcessor):
-    def __init__(self, downloader=None, preferredcodec=None, preferredquality=None, keepvideo=False, nopostoverwrites=False):
+    def __init__(self, downloader=None, preferredcodec=None, preferredquality=None, nopostoverwrites=False):
         FFmpegPostProcessor.__init__(self, downloader)
         if preferredcodec is None:
             preferredcodec = 'best'
         self._preferredcodec = preferredcodec
         self._preferredquality = preferredquality
-        self._keepvideo = keepvideo
         self._nopostoverwrites = nopostoverwrites
 
     def get_audio_codec(self, path):
@@ -145,8 +139,7 @@ class FFmpegExtractAudioPP(FFmpegPostProcessor):
 
         filecodec = self.get_audio_codec(path)
         if filecodec is None:
-            self._downloader.to_stderr(u'WARNING: unable to obtain file audio codec with ffprobe')
-            return None
+            raise PostProcessingError(u'WARNING: unable to obtain file audio codec with ffprobe')
 
         more_opts = []
         if self._preferredcodec == 'best' or self._preferredcodec == filecodec or (self._preferredcodec == 'm4a' and filecodec == 'aac'):
@@ -204,10 +197,10 @@ class FFmpegExtractAudioPP(FFmpegPostProcessor):
         except:
             etype,e,tb = sys.exc_info()
             if isinstance(e, AudioConversionError):
-                self._downloader.to_stderr(u'ERROR: audio conversion failed: ' + e.message)
+                msg = u'audio conversion failed: ' + e.message
             else:
-                self._downloader.to_stderr(u'ERROR: error running ' + (self._exes['avconv'] and 'avconv' or 'ffmpeg'))
-            return None
+                msg = u'error running ' + (self._exes['avconv'] and 'avconv' or 'ffmpeg')
+            raise PostProcessingError(msg)
 
         # Try to update the date time for extracted audio file.
         if information.get('filetime') is not None:
@@ -216,29 +209,24 @@ class FFmpegExtractAudioPP(FFmpegPostProcessor):
             except:
                 self._downloader.to_stderr(u'WARNING: Cannot update utime of audio file')
 
-        if not self._keepvideo:
-            try:
-                os.remove(encodeFilename(path))
-            except (IOError, OSError):
-                self._downloader.to_stderr(u'WARNING: Unable to remove downloaded video file')
-                return None
-
         information['filepath'] = new_path
-        return information
+        return False,information
 
 class FFmpegVideoConvertor(FFmpegPostProcessor):
     def __init__(self, downloader=None,preferedformat=None):
-        FFmpegPostProcessor.__init__(self,downloader)
+        super(FFmpegVideoConvertor, self).__init__(downloader)
         self._preferedformat=preferedformat
 
     def run(self, information):
         path = information['filepath']
         prefix, sep, ext = path.rpartition(u'.')
         outpath = prefix + sep + self._preferedformat
-        if not self._preferedformat or information['format'] == self._preferedformat:
-            return information
-        self._downloader.to_screen(u'['+'ffmpeg'+'] Converting video from %s to %s, Destination: ' % (information['format'], self._preferedformat) +outpath)
+        if information['ext'] == self._preferedformat:
+            self._downloader.to_screen(u'[ffmpeg] Not converting video file %s - already is in target format %s' % (path, self._preferedformat))
+            return True,information
+        self._downloader.to_screen(u'['+'ffmpeg'+'] Converting video from %s to %s, Destination: ' % (information['ext'], self._preferedformat) +outpath)
         self.run_ffmpeg(path, outpath, [])
         information['filepath'] = outpath
         information['format'] = self._preferedformat
-        return information
+        information['ext'] = self._preferedformat
+        return False,information
diff --git a/youtube_dl/__init__.py b/youtube_dl/__init__.py
index 95add9eb1..ae12128b9 100644
--- a/youtube_dl/__init__.py
+++ b/youtube_dl/__init__.py
@@ -175,7 +175,6 @@ def parseOpts():
             action='store', dest='subtitleslang', metavar='LANG',
             help='language of the closed captions to download (optional) use IETF language tags like \'en\'')
 
-
     verbosity.add_option('-q', '--quiet',
             action='store_true', dest='quiet', help='activates quiet mode', default=False)
     verbosity.add_option('-s', '--simulate',
@@ -251,6 +250,8 @@ def parseOpts():
             help='"best", "aac", "vorbis", "mp3", "m4a", "opus", or "wav"; best by default')
     postproc.add_option('--audio-quality', metavar='QUALITY', dest='audioquality', default='5',
             help='ffmpeg/avconv audio quality specification, insert a value between 0 (better) and 9 (worse) for VBR or a specific bitrate like 128K (default 5)')
+    postproc.add_option('--recode-video', metavar='FORMAT', dest='recodevideo', default=None,
+            help='Encode the video to another format if necessary (currently supported: mp4|flv|ogg|webm)')
     postproc.add_option('-k', '--keep-video', action='store_true', dest='keepvideo', default=False,
             help='keeps the video file on disk after the post-processing; the video is erased by default')
     postproc.add_option('--no-post-overwrites', action='store_true', dest='nopostoverwrites', default=False,
@@ -380,6 +381,9 @@ def _real_main():
         opts.audioquality = opts.audioquality.strip('k').strip('K')
         if not opts.audioquality.isdigit():
             parser.error(u'invalid audio quality specified')
+    if opts.recodevideo is not None:
+        if opts.recodevideo not in ['mp4', 'flv', 'webm', 'ogg']:
+            parser.error(u'invalid video recode format specified')
 
     if sys.version_info < (3,):
         # In Python 2, sys.argv is a bytestring (also note http://bugs.python.org/issue2128 for Windows systems)
@@ -436,6 +440,7 @@ def _real_main():
         'prefer_free_formats': opts.prefer_free_formats,
         'verbose': opts.verbose,
         'test': opts.test,
+        'keepvideo': opts.keepvideo,
         })
 
     if opts.verbose:
@@ -457,7 +462,9 @@ def _real_main():
 
     # PostProcessors
     if opts.extractaudio:
-        fd.add_post_processor(FFmpegExtractAudioPP(preferredcodec=opts.audioformat, preferredquality=opts.audioquality, keepvideo=opts.keepvideo, nopostoverwrites=opts.nopostoverwrites))
+        fd.add_post_processor(FFmpegExtractAudioPP(preferredcodec=opts.audioformat, preferredquality=opts.audioquality, nopostoverwrites=opts.nopostoverwrites))
+    if opts.recodevideo:
+        fd.add_post_processor(FFmpegVideoConvertor(preferedformat=opts.recodevideo))
 
     # Maybe do nothing
     if len(all_urls) < 1:
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index 8f856ee8c..0e37390a2 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -450,7 +450,8 @@ class PostProcessingError(Exception):
     This exception may be raised by PostProcessor's .run() method to
     indicate an error in the postprocessing task.
     """
-    pass
+    def __init__(self, msg):
+        self.msg = msg
 
 class MaxDownloadsReached(Exception):
     """ --max-downloads limit has been reached. """